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  • 1
    Digitale Medien
    Digitale Medien
    Photophysical properties and laser performance of photostable UV laser dyes (1988)
    Springer
    Applied physics 45 (1988), S. 279-284 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 07.65 ; 33 ; 42.55 ; 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The photophysical properties such as singlet absorption and fluorescence spectra, the fluorescence quantum yield and fluorescence decay time as well as the laser performance data such as the tuning range, the conversion efficiency, and the photochemical stability of 12 sterically hinderedp-quaterphenyls have been measured in ethanol and/or dioxane at room temperature. The sterically hinderedp-quaterphenyls exhibit shorter laser dye emissions in the 330–380 nm range than the parent compoundp-quaterphenyl. The conversion efficiencies of the sterically hinderedp-quaterphenyls range between 1 and 21%. The photochemical stability of the sterically hinderedp-quaterphenyls is by a factor of 10 to 20 better in dioxane than in ethanol. 2-Methyl-5-tert. butyl-p-quaterphenyl and 2,5,2‴,5‴-tetramethyl-p-quaterphenyl are among the most stable UV laser dyes known today.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00687157
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  • 2
    Digitale Medien
    Digitale Medien
    A continuously tunable GaAs diode laser with an external resonator (1989)
    Springer
    Applied physics 49 (1989), S. 29-32 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60B
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Design and characteristics of an “external cavity single mode GaAs diode laser” are described which allow continuous wavelength tuning over 50 GHz without mode hops. Tuning is achieved by synchronous tilting of both a thin solid etalon and a Brewster plate inside the laser resonator. Stabilizing the laser frequency to an external Fabry-Perot interferometer yields a frequency stability of ≦1 MHz at output powers up to 20 m W.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00332122
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  • 3
    Digitale Medien
    Digitale Medien
    Wideband tuning of the blue-green XeF (C→A) laser (1985)
    Springer
    Applied physics 37 (1985), S. 205-207 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Efficient wavelength tuning from 446 to 524 nm with a minimum spectral linewidth of 1 nm was demonstrated for an electron beam pumped XeF(C→A) laser. Energy densities of 0.1 J/l were obtained for an optimized Ar/Kr/Xe/F2/NF3 mixture.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692942
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  • 4
    Digitale Medien
    Digitale Medien
    New submillimetre laser lines from CH3OD and CD3OD (1985)
    Springer
    Applied physics 37 (1985), S. 209-211 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Thirteen new submillimetre emission lines have been observed when pumping CH3OD using isotopic CO2 lasers, and fourteen when pumping CD3OD. Three isotopic CO2 lasers were used12C16O2,12C18O2, and13C16O2. The new lines were observed in a Fabry-Perot resonator. The wavelength ranges observed were from 55 to 320 μm for CH3OD and from 66 to 531 μm for CD3OD. The polarisation of the submillimetre laser lines relative to the CO2 pump line has also been determined.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692943
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  • 5
    Digitale Medien
    Digitale Medien
    Simple single-frequency He-Ne laser (1986)
    Springer
    Applied physics 40 (1986), S. 153-155 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract For a (0.5–0.6)m long He−Ne laser tube, single longitudinal mode 632.8 nm generation is obtained, using a higher gas-mixture pressure and application of an axial magnetic field. An efficient and very simple mode selection is obtained by gas-mixture pressure increase only. A multimode power to single-mode power conversion coefficientk=0.75 is obtained by increasing the tube pressure. A further increase tok=0.85 is possible with optimum magnetic field and gas pressure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697245
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  • 6
    Digitale Medien
    Digitale Medien
    Stimulated radiation via several hybrid resonance processes in Na-K or K vapor (1986)
    Springer
    Applied physics 41 (1986), S. 125-129 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract This paper reports the observation and analysis of several different opticalpumping and energy-transfer processes for generating stimulated radiation, including equal or unequal frequency two-step Na2−K and K2−K hybrid resonance. A series of infrared stimulated and cascade stimulated lines by the transitions in atomic potassium were detected.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00702664
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  • 7
    Digitale Medien
    Digitale Medien
    On the opto-voltaic measurements in CO and CO2 lasers (1985)
    Springer
    Applied physics 36 (1985), S. 149-153 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60 ; 42.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We observed and compared the opto-voltaic signals in CO and CO2 lasers. The signals are obtained capacitively from the water cooling jacket as a low voltage source not influencing the current circuit. We observed from measurement that the output power and the so-called optovoltaic input power have a distinct relationship depending on laser current and cavity parameters. It will be shown that opto-voltaic detection is a very sensitive method especially for CO lasers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00691780
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  • 8
    Digitale Medien
    Digitale Medien
    Synchronously pumped double mode-locking of a rhodamine 6G-Cresyl violet mixture (1985)
    Springer
    Applied physics 37 (1985), S. 7-9 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Rhodamine 6G-Cresyl violet dye mixtures are synchronously pumped to obtain double mode-locking. Subpicosecond pulses are obtained at two wavelengths in an experimental setup that is easy to implement into existing conventional synchronously pumped systems. In addition, the excitation mechanisms of the secondary dye are discussed and evidence for resonant energy transfer is presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00691686
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  • 9
    Digitale Medien
    Digitale Medien
    An oscillator-amplifier distributed feedback dye laser system, pumped by a single TEA N2 laser (1985)
    Springer
    Applied physics 37 (1985), S. 35-39 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In this paper we describe a simple and inexpensive Distributed Feedback Dye Laser (DFDL) system for picosecond pulse generation. This system consists of an oscillator-amplifier DFDL, either in the grating or in the prism configuration: both stages are pumped by a single TEA nitrogen laser with improved beam quality. Single pulses having duration of 26 ps are obtained at a frequency up to 100Hz; the overall pulse-to-pulse stability is, at the maximum frequency, of about 25%. This system is particularly well-suited for time-resolved fluorescence microscopy studies where short tunable laser pulses of low energy are required.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00691690
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  • 10
    Digitale Medien
    Digitale Medien
    Inhomogeneous broadening effects in Optical Klystrons operating with accelerating devices without radiative damping (1985)
    Springer
    Applied physics 37 (1985), S. 229-232 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In this letter paper we analyse the effect of electron-beam qualities (namely, energy spread and emittances) on both spontaneous emission and gain of an Optical Klystron (OK). We use the relationship between average current and normalized emittances, typical of the accelerating machines without radiative damping, to evaluate the optimum operating parameters.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692947
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  • 11
    Digitale Medien
    Digitale Medien
    Power optimization of a Tl photodissociation laser (1985)
    Springer
    Applied physics 38 (1985), S. 165-169 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 34 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Conditions for the operation of a Tl photodissociation laser, in view of power optimization, have been determined. A crucial parameter is found to be quenching of the upper laser level. A value for the quenching cross-section of the 72 S 1/2 Tl state by the TlI molecules of 2×10−14 cm2 has been measured.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697479
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  • 12
    Digitale Medien
    Digitale Medien
    Photoquenching parameters for commonly used laser dyes (1985)
    Springer
    Applied physics 38 (1985), S. 191-197 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 35 ; 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Laser dyes which are commonly used in pulsed laser pumped dye laser (PLPDL) systems have been investigated. It is shown that photoquenching plays an important role in the pumping process of all laser dyes, determining the efficiency of the PLPDL. Molecular parameters, such as absorption cross sections at various pumping wavelengths and fluorescence lifetimes of theS n (n〉1) excited electronic states of laser dyes, have been determined utilizing the photoquenching technique.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697483
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  • 13
    Digitale Medien
    Digitale Medien
    Characterization of the noise in continuously operating mode-locked lasers (1986)
    Springer
    Applied physics 39 (1986), S. 201-217 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An experimental and theoretical investigation of the fluctuations of the pulses from continuous-wave mode-locked lasers is presented. It is shown that these fluctuations can be detected and quantitatively characterized from measurements of the power spectrum of the light intensity. Such power spectra can be measured with great accuracy by shining the laser output on a suitable photodetector and by processing the detector signal with the use of an electronic spectrum analyzer. Different types of noise such as fluctuations of the pulse energy, pulse repetition time, and pulse duration, can be readily recognized from their characteristic spectral signature. Experimental results of noise measurements are presented for a synchronously mode-locked dye laser pumped by an acousto-optically mode-locked argon ion laser, and also for a colliding pulse passively mode-locked dye laser.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697487
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  • 14
    Digitale Medien
    Digitale Medien
    Performance improvement of an x-ray preionized XeCl laser of very small discharge volume (1986)
    Springer
    Applied physics 41 (1986), S. 31-37 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 34.80G ; 42.55 ; 52.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Increasing the preionization electron density is found to be an effective method for improving the output performance of discharge-pumped excimer lasers at high gas pressures when the power-supply voltage becomes a limiting factor. In a small volume (2 cm3), x-ray preionized discharge, orders of magnitude improvement in XeCl laser power output (up to 400 kW) and pulse energy (up to 26 mJ) over previously reported results have been found possible using this method. Modifications to the low energy x-ray source and discharge system leading to these improvements are described. Various laser output characteristics are also presented and discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697524
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  • 15
    Digitale Medien
    Digitale Medien
    Passive mode locking of the continuous wave DCM dye laser (1986)
    Springer
    Applied physics 41 (1986), S. 53-55 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The first passive mode locking of the continuous wave (cw) DCM dye laser is reported. Subpicosecond pulses as short as 0.68 ps were obtained over the spectral region from 655 to 673 nm from a simple linear cavity with no dispersion optimisation. The dye 1,3′ Diethyl 4,2′ quinolythiacarbocyanine iodide (DQTCI) was used as the saturable absorber.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697528
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  • 16
    Digitale Medien
    Digitale Medien
    New cw optically pumped FIR laser lines (1986)
    Springer
    Applied physics 41 (1986), S. 179-181 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Far-infrared laser action has been demonstrated in three previously unknown laser media. The substances used were: propargyl fluoride, 15-N cyanogen fluoride, and hydroxylamine. Assignments of the molecular transitions giving rise to the observed laser lines were made for the latter two compounds. New FIR laser lines were also observed with two substances, vinyl chloride and vinyl fluoride, which were already known as laser media by pumping with isotopic CO2 and N2O laser lines. The wavelengths of a total of 26 new FIR laser lines were determined together with the threshold pump power and an indication of the relative line strengths.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00693920
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  • 17
    Digitale Medien
    Digitale Medien
    Optimization criteria for optical klystrons (1986)
    Springer
    Applied physics 41 (1986), S. 231-234 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We discuss simple criteria which allow the determination of both an optimum drift strength and total length, for the optical klystron operation. The analysis of the gain reduction factors also includes the finite microbunch length. We extend the discussion to harmonic generation, where we also find an optimum for the input power.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697403
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  • 18
    Digitale Medien
    Digitale Medien
    Numerical analysis of multi-mode laser with modulated inversion (1987)
    Springer
    Applied physics 43 (1987), S. 139-153 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.50.+q ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A systematic description is developed for the dynamical behavior of a multi-mode unidirectional ring laser under modulation of the population inversion in a homogeneously broadened active medium. The modulation frequency is chosen to be close to the longitudinal mode spacing in the cavity. We report a rigorous and extensive numerical analysis of this system by choosing the dc component of the population inversion, the modulation amplitude and the detuning of the modulation frequency as control parameters for both cases of good and bad cavities. In the good cavity, this system exhibits two characteristic transitions toward the conventional mode-locked pulse oscillation as the modulation amplitude increases: the first transition to the region of the ordered amplitude and disordered phase of the electric field, and the second one to the ordinary mode-locking in which both the amplitude and the phase are ordered. In the bad cavity, two kinds of chaos are observed: the Lorenz-type chaos in the region of weak modulation and strong population inversion and the quasi-periodic chaos in the region of strong modulation and intermediate population inversion. The dimensionality of chaotic behaviors is also tested to reveal mechanisms of instability. The coherent and incoherent properties of emitted light at each region are clarified, too.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00695615
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  • 19
    Digitale Medien
    Digitale Medien
    CW injection phase locking in homogeneously broadened media II. Phase locking and tunability of CO2 waveguide lasers (1987)
    Springer
    Applied physics 43 (1987), S. 273-279 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Injection phase locking of a powerful CO2 waveguide laser with a stable singlefrequency master oscillator is described. The locking range is experimentally investigated versus both injected signal frequency and slave cavity length. A locking tunability up to ±180 MHz from CO2 10P(20) line center has been achieved. Experimental results are in excellent agreement with the theoretical development exposed in the preceeding paper.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692498
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  • 20
    Digitale Medien
    Digitale Medien
    New large offset far-infrared laser lines from CD3OH (1987)
    Springer
    Applied physics 44 (1987), S. 111-117 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The CD3OH molecule has been investigated for new far-infrared laser lines by optically pumping with a cw waveguide CO2 laser. The increased tunability (300 MHz) with respect to a conventional CO2 laser permits to pump many new CD3OH lines. As a consequence 108 new laser lines have been discovered, ranging from 42.9 to 1155 μm in wavelength. On some lines the effect of an electric Stark field has been investigated demonstrating a laser frequency tuning. The total number of known FIR laser lines from CD3OH is increased to about 340 making this molecule the most prolific together with CH3OH.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694203
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  • 21
    Digitale Medien
    Digitale Medien
    Automatic impedance matching and opto-Hertzian effect in RF excited CO2 waveguide lasers (1988)
    Springer
    Applied physics 47 (1988), S. 149-157 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60 ; 42.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report the successful operation of a novel automatic impedance matching technique (AIMing) and observations of the opto-Hertzian effect. The AIMing system is capable of maintaining efficient RF power delivery to a CO2 waveguide laser over a wide range of operating conditions. The opto-Hertzian signal, produced by circulating laser power fluctuations and detected in the RF reflected power, has some interesting properties and may be used for laser frequency stabilisation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00684082
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  • 22
    Digitale Medien
    Digitale Medien
    Experimental investigation of the MIR optically pumped ammonia bidirectional ring laser (1989)
    Springer
    Applied physics 49 (1989), S. 377-381 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have studied the Doppler-broadened 11.76 μm 15NH3 emission line optically pumped in a ring resonator by a cw CO2 laser operating on the 10R(42) line. In the pure ammonia, even if the pumping occurs inside the Doppler width, the two-photon Raman process seems to be responsible for the laser emission. Both in the pure 15NH3 and in the 15NH3, N2, and He mixture we demonstrate the possibility of obtaining a unidirectional laser amplifier.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00324189
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  • 23
    Digitale Medien
    Digitale Medien
    Spectral investigation of cw rf-pumped atomic Xe laser with a slab geometry (1996)
    Springer
    Applied physics 62 (1996), S. 11-14 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60 ; 52.90
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A radiofrequency excited atomic Xe slab laser with an active volume of 2 × 10 × 300 mm3 using a quartz envelope containing the laser-gas mixture shows a stable cw performance with an output power of almost 1 W. The free-running system oscillates, depending on gas composition and density, on several lines between 1.73 and 3.51 μm. Line competition phenomena are observed. Single-line oscillation yields more than 500 mW.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081241
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  • 24
    Digitale Medien
    Digitale Medien
    Imaging and analysis of photomechanical effects induced in water by high-power laser-target interaction (1996)
    Springer
    Applied physics 62 (1996), S. 503-510 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.80 ; 81.60 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The kinetics of cavitation and associated photo-mechanical effects induced by underwater pulsed-laser irradiation of solid targets has been studied experimentally and analyzed with theoretical methods. A xenon-chloride excimer laser of 150 ns pulse duration has been utilized to produce ablation and local photofragmentation of artificial samples of hard tissues at fluences of 12–24 J/cm2. The evolution of pressure wave and cavitation formations developing in the liquid from the target surface after laser irradiation has been observed with a time-resolved imaging technique employing a pump-probe laser arrangement. The analysis of experimental results has been performed by using the theoretical model of “point explosion” that has been successfully applied to fit the cavitation kinetics, providing also quantitative information on the energy transfer during photo-acoustic interactions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081051
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  • 25
    Digitale Medien
    Digitale Medien
    Continuous-wave mode-locked solid-state lasers with enhanced spatial hole burning (1995)
    Springer
    Applied physics 61 (1995), S. 429-437 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60 ; 42.55 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We systematically investigate the difference between both actively and passively mode-locked lasers with Gain-at-the-End (GE) and Gain-in-the-Middle (GM) at the example of Nd:YLF lasers. The GE laser generates pulse widths approximately three times shorter than a comparable GM cavity. This is due to enhanced Spatial Hole Burning (SHB) which effectively flattens the saturated gain and allows for a larger lasing bandwidth compared to a GM cavity. We first investigate enhanced SHB by measuring the cw mode spectrum, where we have observed that the mode spacing in GE cavities depends primarily on the crystal length. This was also confirmed for a Nd:LSB crystal, where the pump absorption length was significantly shorter than the crystal length. In mode-locked operation, pulse widths of 4 ps for passive mode locking and 5 ps for active mode locking are demonstrated with GE cavities, compared to 11 ps for passive and 17 ps for active mode locking with GM cavities. Additionally, the time-bandwidth product for the GE cavity is approximately twice the ideal product for a sech2 pulse shape and cannot be improved by dispersion compensation alone, while the GM cavity has nearly ideal time-bandwidth-limited performance. The results for the GM cavity compare well to existing theories taking into account the added effect of pump-power-dependent gain bandwidth which increases the bandwidth of Nd: YLF from 360 to 〉 500 GHz. In a following paper [1] (called Part II) a rigorous theoretical treatment of the effects due to SHB will be presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081271
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  • 26
    Digitale Medien
    Digitale Medien
    Performance studies of a pulsed HF laser with a sliding discharge plasma cathode (1996)
    Springer
    Applied physics 62 (1996), S. 357-365 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The plasma electrode design concept is applied for the first time to an HF laser. The discharge along the surface of a dielectric (sliding discharge) is used as a plasma cathode for the main laser discharge. The laser operates at atmospheric pressure with a gas mixture of He/SF6/C3H8. Details are presented on the efficiency of energy transfer, the dependence of laser performance on circuit parameters, gas mixture, relative energy loading and time delay between the plasma electrode and main discharges. The F atom production rate is estimated from the linear dependence of the output energy on the electric charge passed through the discharge. Output energies of 600 mJ were obtained at 1.6% efficiency from a small active discharge of 108 cm3 volume and 38 cm length, while the maximum specific input and output energies were 370 J/1 and 5.7 J/1, respectively. These values compare favourably with those reported in the literature for non-chain-reaction-type gas mixtures at 1 atm pressure and demonstrate that the plasma electrode design is a powerful scheme for developing gas-discharge lasers.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081197
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  • 27
    Digitale Medien
    Digitale Medien
    Picosecond configuration relaxation in the1 T 1u -state of Ag−-centers in KI (1985)
    Springer
    Applied physics 36 (1985), S. 213-216 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 78.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The relaxation of the optically excited Ag−-center in KI is investigated by measuring the risetime of the spontaneous emission from the relaxed excited state. The energy and number of phonons created in the relaxation process are determined.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00704577
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  • 28
    Digitale Medien
    Digitale Medien
    Experimental study of cw carbon monoxide flame chemical laser of the CS2/O2/CO2 type (1985)
    Springer
    Applied physics 37 (1985), S. 87-91 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The performance of a continuous-wave (cw) CO flame chemical laser (FCL) of the CS2/O2/CO2 type is presented. The laser gives up to 0.7 W cw output power on a number ofP v (J) lines corresponding to 11→10, ..., 7→6 vibrational bands of CO molecule. The measured values of chemical efficiency based on the reaction O+CS→CO*(v)+S and the specific power are 0.1% and 0.7J/g, respectively. The spectral composition of the CO FCL of the CS2/O2/CO2 type shows lasing in the region from 5.194 to 5.573 μm. All experimental measurements are conducted with a nondispersive optical cavity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692554
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  • 29
    Digitale Medien
    Digitale Medien
    Attachment kinetics and life time of perionization electrons in rate-gas halogen laser mixtures (1986)
    Springer
    Applied physics 40 (1986), S. 15-23 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 34.80G ; 42.55 ; 52.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Experiments on homogeneous initiation of pulsed avalanche discharges in typical XeCl laser mixtures show that the x-ray preionization pulse remains effective after a time delay of the order of 20 μs even at very high gas pressures (∼15 atm). Detailed kinetics analyses indicate that dissociative attachment of HCl is relatively slow during and after the preionization period so that the long effective delay time cannot be attributed to the storage effect of Cl− ions. Instead, the observed phenomenon can be attributed to the long survival time of the free electrons due to relatively slow diffusion and electron-ion recombination. Some problems arising from quantitative interpretation of the experimental results are also noted and discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697222
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  • 30
    Digitale Medien
    Digitale Medien
    High-power, line-tunable14NH3 and15NH3 lasers (1985)
    Springer
    Applied physics 38 (1985), S. 185-189 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A high-power, line-tunable NH3 laser pumped by a TEA CO2 laser has been developed for application to laser isotope separation of tritium. Laser lines from15NH3 are newly observed in a range from 11.24 to 13.23 μm. The performance of an15NH3 laser is compared to that of an14NH3 laser.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697482
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  • 31
    Digitale Medien
    Digitale Medien
    cw Injection phase locking in homogeneously broadened media (1987)
    Springer
    Applied physics 43 (1987), S. 203-208 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A theory of cw injection phase locking in homogeneously broadened media is investigated using density matrix formalism to derive the interactions of three coherent fields with a two levels system. This powerful formalism leads to analytical expressions of the complex gain for each wave propagating inside the amplifier medium. Studies of the minimum signal intensity for single-frequency operation and power output are related.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00695624
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  • 32
    Digitale Medien
    Digitale Medien
    Measurement and assignment of new FIR laser lines in12CH3OH and13CH3OH (1987)
    Springer
    Applied physics 44 (1987), S. 67-69 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have found twelve new FIR laser lines in12CH3OH and thirty three in13CH3OH. Both molecules were pumped by a regular cw CO2 laser. We have also assigned 2013CH3OH laser lines to specific rotational energy levels in the excited C-O stretchhindered rotation combined states
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00693987
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  • 33
    Digitale Medien
    Digitale Medien
    Undamped undulation superposed on the passive Q-switching pulse of a CO2 laser (1986)
    Springer
    Applied physics 39 (1986), S. 83-90 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An undamped undulation superposed on the pulse tail of the passive Q-switching is observed using HCOOH gas as a saturable absorber. The pulse shapes with the undulation are nicely reproduced through the rate-equation analysis in which the laser gain medium is described as a three-level system. Good agreements between the observation and the calculation are also obtained in the dependence of the period and the width of passive Q-switching pulse on laser parameters. The mechanism of the undulation is interpreted as the relaxation oscillation attributed to the relaxation from the lower laser level. The collisional rate constant of HCOOH molecule is also obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694802
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  • 34
    Digitale Medien
    Digitale Medien
    Inversion of atomic resonance transitions by electron collisional dissociation (1985)
    Springer
    Applied physics 37 (1985), S. 73-78 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60 ; 51.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Population inversion of several resonance transitions in the rare-earth atom thulium has been achieved by electron collisional dissociation of TmI3 molecules in a fast electric discharge configuration. The inversion manifests itself by a strong spiking behavior during the initial current rise and lasts for several nanoseconds. Results of a model calculation of this inversion process for resonance lines support our experimental findings.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692552
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  • 35
    Digitale Medien
    Digitale Medien
    On noise and fluctuations in a synchronously mode-locked cw laser system (1985)
    Springer
    Applied physics 37 (1985), S. 213-217 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A single-shot and synchronously-scanned streak camera, autocorrelation and noise spectrum analysing techniques are utilized to study the output characteristics of synchronously mode-locked cw lasers. Four main conclusions are drawn: (i) the pulse train from a synchronously-pumped dye laser reveals, besides phase jitter, considerable pulse shape fluctuations; (ii) autocorrelation measurements may be highly misleading when actual pulse shapes are considered; (iii) both the phase jitter and pulse shape fluctuations of the dye laser output are caused by the phase fluctuations of the pumping ion laser pulse train; (iv) the phase jitter of the ion laser proceeds from the fluctuations in the cavity roundtrip time with a characteristic time of about 5 μs. Under optimum conditions the rms noise of the dye laser output was 2% and the phase jitter with respect to the rf sine drive of the acousto-optical mode-locker, ∼30 ps. A qualitative explanation fo the noise properties is given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692944
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  • 36
    Digitale Medien
    Digitale Medien
    Optically pumped lasers between high-lying states in the sodium dimer (1985)
    Springer
    Applied physics 37 (1985), S. 233-238 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 33
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract More than 25 laser lines around 2.5 μm from theC 1∏ u state to (3)1∑ g + and 7 laser lines around 0.9 μm from the high-lying1∑ u state to (2)1∑ g + in the sodium dimer were detected using a nitrogen laser as the pumping source. Most of the optically pumped laser lines have been identified.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692948
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  • 37
    Digitale Medien
    Digitale Medien
    Dynamic absorption effects in KrF* amplifiers (1987)
    Springer
    Applied physics 42 (1987), S. 11-15 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 33 ; 42.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The results of transient loss measurements performed in a self-sustained discharge KrF* amplifier are reported. Analysis of these results gives a minimum value of 20 for the effective gain to loss ratiog 0/αeff, indicating that efficient extraction of energy in subpicosecond KrF* amplifiers in the ∼1 J range should be achievable.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694767
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  • 38
    Digitale Medien
    Digitale Medien
    170 fs pulse generation by optical pulse compression at 308 nm (1988)
    Springer
    Applied physics 46 (1988), S. 139-140 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Pulses of 170 fs duration have been obtained by compression of 220–250 fs pulses of a hybrid excimer-dye laser setup.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00686466
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  • 39
    Digitale Medien
    Digitale Medien
    Passive Q-switching and mode-locking for the generation of nanosecond to femtosecond pulses (1988)
    Springer
    Applied physics 46 (1988), S. 43-60 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The passive and hybrid Q-switching and mode-locking of solid-state lasers, dye lasers, semiconductor lasers and gas lasers is reviewed. The dynamics of saturable absorbers and reverse saturable absorbers is illustrated. The nanosecond pulse generation by passive and hybrid Q-switching of low-gain active media is described. The picosecond and femtosecond pulse generation by passive and hybrid mode-locking in low-gain and high-gain active media is analysed. The performance data of passively and hybridly mode-locked cw femtosecond dye lasers are collected. The pulse shortening of ultra-fast pulses with saturable absorbers in intra-cavity and extra-cavity configurations is discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00698653
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  • 40
    Digitale Medien
    Digitale Medien
    Shortening of travelling-wave-amplified spontaneous emission by a transversal pumping scheme (1986)
    Springer
    Applied physics 40 (1986), S. 35-38 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 82.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An experimental investigation on shortening of travelling-wave ASE employing a transversal pumping is presented. A N2 laser with λ=337.1 nm, pulsewidth: 700 ps is used as a pump source. An ASE pulse with duration of 45, 55 and 45 ps from dye solution of Rh 6G, Rh B and C311, respectively, is obtained. Pulse shapes of output signals generated from these solutions in three different pumping schemes are compared.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697225
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  • 41
    Digitale Medien
    Digitale Medien
    Preionization and discharge stability study of long optical pulse duration UV-preionized XeCl lasers (1986)
    Springer
    Applied physics 41 (1986), S. 1-24 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract This paper presents a complete study of the temporal and spatial characteristics of the preionization of a XeCl rare-gas halide laser. The detailed study was made possible using the technique of laser-induced preionization which utilizes the uv radiation from a KrF laser to preionize a second rare-gas halide laser. In addition to the preionization study, high spatial and temporal resolution framing camera photographs have been used to investigate the growth of discharge instabilities which can lead to the premature termination of the XeCl optical pulse. The roles played by HCl, Xe, the buffer gas as well as the discharge energy loading in the development of discharge instabilities have been determined experimentally.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697522
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  • 42
    Digitale Medien
    Digitale Medien
    Subpicosecond pulse generation in synchronously pumped energy transfer dye lasers (1986)
    Springer
    Applied physics 39 (1986), S. 183-186 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We describe the relatively efficient generation of picosecond pulses in an energy transfer dye laser synchronously pumped by an argon-ion laser and a Q-switched and modelocked cw-Nd3+: YAG laser, respectively. Maximum tuning range from 550 to 700 nm has been achieved. In both cases considerable pulse shortening in the spectral region of the donor emission was observed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697417
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  • 43
    Digitale Medien
    Digitale Medien
    Determination of the unsaturated losses and of the saturation intensity in the KrCl excimer laser (1986)
    Springer
    Applied physics 40 (1986), S. 115-120 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The unsaturated losses α, and the saturation intensityI s, were measured in an uv-preionized KrCl laser for optimized He and Ne based laser gas mixtures. The measurements were made as a function of the specific power loading and of the total pressure of the laser mixtures. Higher values for α andI s were found for the Ne-based laser mixture than for the He-based mixture. At 45 kV charging voltage and at 355 kPa of total pressure we measured α=0.053 cm−1 andI s =9.4MW/cm2 for the Ne based mixture, and α=0.035 cm−1 andI s =5.1MW/cm2 for the He based mixture.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694785
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  • 44
    Digitale Medien
    Digitale Medien
    Fluctuation mechanism and statistical characteristics of active-passive mode locking in giant pulse solid-state lasers (1986)
    Springer
    Applied physics 40 (1986), S. 157-164 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A theoretical investigation of active-passive mode-locked lasers is presented. The main conclusion is that the intrinsic instability of a passively mode-locked laser due to the primordial noise fluctuation can be minimized by introducing an active modulator into the resonant cavity. Good agreement between computer simulation and experimental results reported previously is obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697246
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  • 45
    Digitale Medien
    Digitale Medien
    A mirror with an intensity-dependent reflection coefficient (1988)
    Springer
    Applied physics 45 (1988), S. 191-195 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A device exhibiting a power-dependent reflection coefficient with fast time response and no frequency shift is proposed and analysed. It utilizes a combination of a nonlinear crystal for second harmonic generation and a dichroic mirror with high reflectivity for the second harmonic and partial transmission for the fundamental wavelenth. This device has been successfully used in a preliminary experiment to modelock a Nd:YAG laser.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00695290
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  • 46
    Digitale Medien
    Digitale Medien
    High efficiency cw far infrared lasers at 119 μm and 127 μm (1989)
    Springer
    Applied physics 48 (1989), S. 305-309 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The optically pumped FIR laser lines at 119 μm from CH3OH and at 127 μm from13CD3OH are known to be the most powerful in the far infrared spectral region. We report on efficiency measurements for our waveguide laser system. The effect of various parameters was investigated, resulting in the highest efficiency ever reported for the 119 μm line. The Stark effect and others parameters of the 127 μm were measured, and a new13CD3OH laser line at 175 μm discovered, with the same pump transition. These measurements are helpful for completing the assignment already proposed for the 127 μm line.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694186
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  • 47
    Digitale Medien
    Digitale Medien
    Improved conversion efficiency of XeCl radiation to the first stokes at high pump energy (1988)
    Springer
    Applied physics 47 (1988), S. 101-105 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An XeCl laser beam has been used to investigate stimulated Raman scattering in H2 and in various H2-foreign gas mixtures. Helium, neon, argon, and nitrogen have been tested as foreign gases. In all the investigated mixtures with 50% of H2, the energy conversion efficiency to the first Stokes (353 nm) was more than 70% higher than that obtained in H2 at the same total pressure (40 bar) and pump energy (60 mJ). The dependence of the energy conversion efficiency on pump beam divergence has also been investigated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00696217
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  • 48
    Digitale Medien
    Digitale Medien
    Photoacoustic detection of NH3 in power plant emission with a CO2 laser (1989)
    Springer
    Applied physics 49 (1989), S. 91-97 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 7.65G ; 42.55 ; 86.70G ; 86.70L
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The paper describes a photoacoustic spectrometer for detection of NH3 in power plant emission with a detection limit below 1 ppm. The radiation source is a tunable CO2 waveguide laser, and detection is performed at reduced pressure, where the vibration-rotation lines of NH3 are essentially Doppler broadened. Immunity against interference is ensured by recording a characteristic spectral profile, and problems associated with the high concentration of CO2, and the associated line center absorption are eliminated by utilizing the effect of kinetic cooling on the photoacoustic phase. A computerized spectrometer has been constructed and tested under realistic conditions at a Danish power plant operating a test facility for selective non-catalytic reduction of NO x . Results of this field test are given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00332267
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  • 49
    Digitale Medien
    Digitale Medien
    Spectral properties of diode-pumped non-planar monolithic Nd:YAG ring lasers (1995)
    Springer
    Applied physics 61 (1995), S. 243-248 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The coherence length of a single-frequency monolithic Nd:YAG ring laser is determined by using a highly unbalanced all-fiber Mach-Zehnder interferometer. A coherence length larger than ⋍ 1500km and a 3 dB linewidth less than ⋍ 60 Hz is estimated. Furthermore, an easy method to measure the temperature dependence on several laser parameters is described. This method is based on the laser emission in multiple axial modes, which is enforced by coherent optical feedback. A model explaining the multimode behaviour is presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01082042
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  • 50
    Digitale Medien
    Digitale Medien
    Measurements of collisional quenching of hydrogen atoms in an atmospheric-pressure hydrogen oxygen flame by picosecond laser-induced fluorescence (1995)
    Springer
    Applied physics 61 (1995), S. 479-487 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32.50 ; 33.50 ; 35.80 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Atomic hydrogen has been probed in a hydrogen/oxygen flame at atmospheric pressure by use of two-photon, picosecond Laser-Induced Fluorescence (LIF). The fluorescence was detected and temporally resolved by a streak camera with a temporal resolution of a few ps which allowed determination of the collisionally quenched lifetime of then = 3 level of atomic hydrogen. The measurements were performed for three flame stoichiometries,φ = 1.4, 2.0 and 3.5, and were spatially resolved with respect to the reaction zone. The evaluated lifetime was found to vary rapidly in the reaction zone from 60 to 105 ps just above and then levelled out at 90 ps throughout the post-flame region. Power dependence measurements of the fluorescence signal indicated the presence of other phenomena, such as saturation, ionization and photodissociation. Since an inverted population is created between then = 3 and then = 2 level, Stimulated Emission (SE) of considerable magnitude occurred and was studied temporally resolved using the streak camera. The LIF and SE signal strengths for individual laser pulses were recorded in order to analyse a possible anti-correlation between the LIF and the SE.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081277
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  • 51
    Digitale Medien
    Digitale Medien
    Comparative study of spectral narrowing of a pulsed Ti:Sapphire laser using pulsed and CW injection seeding (1996)
    Springer
    Applied physics 62 (1996), S. 51-57 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report a comparative study of a pulsed as well as continuous-wave (cw) injection seeding of a Ti:Sapphire laser pumped by aQ-switched frequency-doubled Nd3+:YAG laser for achieving narrow spectral bandwidth. The results have indicated that the Ti:Sapphire laser using either a pulsed or a cw injection seeding could achieve efficient energy extraction in a narrow spectral bandwidth. In the case of pulsed injection seeding, the injection energy required for the complete injection seeding critically depended upon the timing of the Ti:Sapphire laser with respect to the delayed onset of the slave laser. On the other hand, in the case of cw injection seeding, the spectral bandwidth of the Ti:Sapphire laser was efficiently narrowed down to approximately 0.01 cm−1 with an injection power of less than 1 mW. In both types of injection seeding, characteristics observed experimentally were compared with those obtained by a numerical simulation code based on the one-dimensional rate-equation model.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081247
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  • 52
    Digitale Medien
    Digitale Medien
    Theoretical and experimental investigation of a waveguide CO2 laser with radio-frequency excitation (1996)
    Springer
    Applied physics 62 (1996), S. 113-127 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 52.00 ; 34.80 ; 52.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A comprehensive experimental and theoretical study of the optimization of a continuous-wave radiofrequency (rf) excited CO2 waveguide laser is presented. The numerical simulation includes the modelling of the gas-discharge plasma parameters like the plasma impedance and energy deposition, the laser kinetics and finally the influence of the resonator feedback on the lasing process. Along with this theoretical study, an extensive experimental research program enabled us to optimize the laser performance of the CO2 waveguide laser. As a result, a total output power of 42 W and a specific output power of 1.1 W/cm were obtained.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081112
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  • 53
    Digitale Medien
    Digitale Medien
    Long lifetime operation of an ArF-excimer laser (1996)
    Springer
    Applied physics 63 (1996), S. 229-235 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An experimental investigation to improve the lifetime of a discharge-excited ArF-excimer laser is presented. The three dominant factors restricting its lifetime are CF4 generation in the laser gas, color-center formation in the optics and input power density reduction due to electrode ablation. Copper electrodes were superior to nickel electrodes in regard to electrode ablation. A gas lifetime of more than 109 shots (about one month at 400 Hz) is shown for an ArF-excimer laser with a liquid-nitrogen trap and high-temperature zirconium alloy trap.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01833791
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  • 54
    Digitale Medien
    Digitale Medien
    The effect of mid-infrared and far-infrared emission, generated at NH3 excitation by intense radiation of a TEA CO2 laser, on ammonia absorption (1996)
    Springer
    Applied physics 63 (1996), S. 355-361 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33.00 ; 42.55 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The effect of Mid-InfraRed (MIR) (λ ≅ 12 μm) and Far-InfraRed (FIR) (λ ≽ 100 μm) emission from excited ammonia on the absorption of intense radiation of a TEA CO2 laser has been studied experimentally under collisional and collisionless excitation conditions with ammonia pressures from 0.5 to 0.03 Torr. The energy of MIR and FIR emission was studied as a function of NH3 pressure and laser energy fluence. Particular emphasis was given to the kinetics of MIR and FIR emission generation at different NH3 pressures and to the measurement of the time delay of re-emitted pulses relative to the exciting CO2 laser pulse. It has been found that the re-emission in the MIR range is highly collisional in nature. The intensity of MIR emission drops sharply (asp 3) with decreasing NH3 pressure and its delay time relative to the exciting laser pulse increases. At the same time, re-emission in the FIR range (in the case of resonant excitation of NH3 at the 9R (30) line of CO2 laser) is observed during an exciting pulse up top 〈 0.03 Torr. When binding the rotational sub-levels of a molecule with transitions, FIR emission acts as rotational relaxation and thus leads to an increase in NH3 IR absorption even at collisionless excitation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01828738
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  • 55
    Digitale Medien
    Digitale Medien
    Continuous wave 1.6 μm laser action in Er doped garnets at room temperature⋆ (1989)
    Springer
    Applied physics 49 (1989), S. 269-273 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 78.45 ; 78.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report on room-temperature cw laser action of Er3+: Yttrium-aluminum-garnet (YAG) and Er3+: Yttrium-gallium-garnet (YGG) crystals at 1.64 μm. The laser operates from the metastable4 I 13/2 manifold into an upper Stark level of the4 I 15/2 ground-state manifold of Er3+. Due to reabsorption losses, the Er3+ concentration of the laser crystals must be low. Laser pumping at a wavelength of 647.1 nm yields lowest thresholds around 30 mW and slope efficiencies up to 12.7% for Er:YAG. Laser operation in Er:YGG is achieved with higher thresholds of about 200 mW and smaller slope efficiencies of 0.9%. The effective emission cross section in YAG is estimated to be σe≈5×10−21 cm2.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00714646
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  • 56
    Digitale Medien
    Digitale Medien
    An analysis of the free-electron laser small-signal gain in a resonator gaussian mode (1989)
    Springer
    Applied physics 49 (1989), S. 541-544 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A simplified analysis of the small-signal gain in the presence of a Gaussian mode is presented for several undulator designs. For a filamentary electron beam, an analytical expression of the gain is obtained and found to be in agreement with previous work and with computer simulations. A general expression of the small-signal gain for the optical klystron FEL is given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00324954
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  • 57
    Digitale Medien
    Digitale Medien
    High-efficiency multicolour Q-switched Nd3+:KGd(WO4)2 laser (1995)
    Springer
    Applied physics 61 (1995), S. 213-215 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Energy output of 400 mJ, an order of magnitude higher than reported previously is obtained in aQ-switched flashlamp-pumped Nd3+:KGd(WO4)2 laser. No pronounced saturation of the output energy with respect to the pump energy is observed. Multiwavelength operation due to efficient Stokes conversion in the laser crystal is demonstrated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01090946
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  • 58
    Digitale Medien
    Digitale Medien
    Efficient vacuum-ultraviolet generation by anti-Stokes Raman scattering using a cryogenic Raman cell (1995)
    Springer
    Applied physics 61 (1995), S. 319-323 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65 ; 42.55 ; 07.60 ; 07.20
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have investigated the increase of efficiency for high-order anti-Stokes Raman scattering using a cryogenic Raman cell. By cooling the cell to liquid-nitrogen temperature, output energies of the 9th-order anti-Stokes wave at 133 nm in normal hydrogen were enhanced by a factor of 10, and the 11th-order anti-Stokes line at 141 nm in normal deuterium appeared, while no output was observed at room temperature. No output energy enhancement, however, was obtained using cooled para-hydrogen as a result of multiple rotational Raman scattering. For long-term operation, the output window surface of the Raman cell was kept at above 200 K in order to protect it from deposition, the absorption of which is detrimental to VUV transmission.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081530
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  • 59
    Digitale Medien
    Digitale Medien
    Continuous operation up to 3 kHz in a discharge-pumped XeCl excimer laser (1996)
    Springer
    Applied physics 63 (1996), S. 1-7 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Continuous operations at a high repetition rate up to 3 kHz for discharge-pumped XeCl excimer laser are presented. The dependence of the clearing ratio on laser-gas pressure and input energy densities is studied. It was found that suitable laser-gas pressures minimize the clearing ratio for various input-energy densities. It is also shown that few density disturbances in the discharge region are induced by gas heating in a discharge-pumped XeCl excimer laser with low input-energy density
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01112828
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  • 60
    Digitale Medien
    Digitale Medien
    Ti:Sapphire-pumped femtosecond optical parametric oscillators based on KTiOPO4 and RTiOAsO4 (1995)
    Springer
    Applied physics 60 (1995), S. 437-442 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.65 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The design, configuration and operation of Ti:Sapphire-laser-pumped femtosecond Optical Parametric Oscillators (OPOs) using KTP and RTA are described. The results presented include configurations capable of producing transform-limited pulses shorter than 40 fs and operating with pump powers as low as 50 mW. Tunability within the 1–3 µn spectral region is demonstrated using pump-tuning alone.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081323
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  • 61
    Digitale Medien
    Digitale Medien
    New UV tunable solid-state lasers for lidar applications (1995)
    Springer
    Applied physics 61 (1995), S. 117-120 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60 ; 92.60 ; 92.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We present the first lidar/DIAL system based on an Ultra Violet (UV) vibronic laser. A Nd:YAG-pumped Ce:LiSAF laser has been developed for this purpose, providing high pulse energy (5 mJ at 10 Hz), very high slope efficiency (33%), and a tuning range from 284 to 299 nm. Simultaneous measurements of SO2 and O3 concentration profiles are presented using this frequency-agile Ce:LiSAF-based lidar system.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01090981
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  • 62
    Digitale Medien
    Digitale Medien
    Continuous-wave mode-locked solid-state lasers with enhanced spatial hole burning (1995)
    Springer
    Applied physics 61 (1995), S. 569-579 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60 ; 42.55 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In Part I of this paper [1] experimental results were presented and discussed. In this part, we investigate theoretically the dynamics of end-pumped solid-state lasers due to enhanced spatial hole burning. This becomes possible by a fast numerical implementation of the saturated gain in the presence of strong spatial hole burning that allows to treat the multimode case for an arbitrary pumping level. We find for a wide range of laser parameters that the mode spacing of the cw running modes is essentially determined by the length of the gain medium and only weakly depends on the absorption depth of the pump transition. It is shown that spatial hole burning can lead to a completely flat saturated gain profile over half of the gain bandwidth. In mode-locked lasers, the flat gain due to spatial hole burning results in shorter pulses. But the pulses are neither Gaussian-nor sech-shaped as they are in actively or passively mode-locked lasers without spatial hole burning. Further, we show that soliton-like pulse shaping can be used to restore a transform-limited sech-shaped pulse in an end-pumped solid-state laser while exploiting the full gain bandwidth of the laser material.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01091215
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  • 63
    Digitale Medien
    Digitale Medien
    Frequency control of a dual-pulse-pumped dye laser by combination of external injection and intracavity self-injection of radiation (1996)
    Springer
    Applied physics 62 (1996), S. 91-95 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A technique is proposed for injection-seeding control of tunable lasers. It is based on a combination of successive external injection and intracavity self-injection of radiation when the active medium is pumped by dual-step pulses. The technique is tested both experimentally (in the case of Nd:YAG-laser-pumped pulsed dye lasers) and numerically, using a model developed by us. Full conversion of the broadband spectrum into the injected line is achieved for an output energy greater by a factor of about 50 than that managed by means of the traditional injection-seeding technique under identical conditions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081254
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  • 64
    Digitale Medien
    Digitale Medien
    Operation of KrF and ArF tunable excimer lasers without Cassegrain optics (1996)
    Springer
    Applied physics 62 (1996), S. 241-247 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A commercial tunable excimer laser consists of an oscillator-amplifier combination. The oscillator produces high-quality light that is sent to the amplifier and is distributed throughout the amplifier cavity via Cassegrain optics. We describe here two alternative approaches, a “single-pass” configuration for use with KrF and a “triple-pass” configuration with ArF, both of which do away with the Cassegrain optics. In each approach, the beam energy is the same as with Cassegrain optics. For KrF, the changes provide better locking, a higher degree of linear polarization, and a better spatial beam homogeneity, but a poorer beam divergence. For ArF, there is also better beam homogeneity, but the locking efficiency and divergence are not as good as with Cassegrain optics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01080951
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  • 65
    Digitale Medien
    Digitale Medien
    A high average power rotating hollow cylinder Nd : glass laser (1996)
    Springer
    Applied physics 63 (1996), S. 585-591 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The rotating hollow cylinder glass laser is one of the approaches for the generation of high average output powers scaling to kilowatt levels from solid-state laser materials. An analytical solution of the heat conduction equation is presented for a thin wall, infinitely long glass medium, with boundary conditions given by Newton's law of cooling. The theoretical result is applied to predict thermal effects of this geometry which ultimately limit the laser performance, and the design of such a laser. A flashlamp pumped rotating Nd-doped phosphate glass hollow cylinder laser has been demonstrated. An average power output of 300 W has been achieved at 3.8% slope efficiency and 2.6% overall efficiency. Our investigation shows that the development of a kilowatt average power rotating cylinder laser is feasible.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01830997
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  • 66
    Digitale Medien
    Digitale Medien
    New FIR laser lines from CHD2OH optically pumped by a cw CO2 laser (1989)
    Springer
    Applied physics 48 (1989), S. 245-248 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract This work reports 83 new optically pumped far infrared laser lines, using deuterated methyl alcohol, CHD2OH, as active medium. For each line we list the measured wavelength, its polarization relative to the pump line, the optimum gas pressure and the CO2 laser pump power at the maximum absorption.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694353
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  • 67
    Digitale Medien
    Digitale Medien
    A new efficient far-infrared optically pumped laser gas: CH3 18OH (1989)
    Springer
    Applied physics 48 (1989), S. 299-304 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The12CH3 18OH molecule has been investigated for new far-infrared laser lines by optically pumping it with a cw waveguide CO2 laser. The larger tunability (318 MHz) with respect to a conventional CO2 laser permits the pumping of many12CH3 18OH lines. As a consequence 100 new laser lines have been discovered, ranging from 34.6 μm to 653.2 μm in wavelength. The infrared spectrum of12CH3 18OH has been observed and all the fundamental vibration energies measured.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694185
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  • 68
    Digitale Medien
    Digitale Medien
    The effect of the crystal field strength on the optical spectra of Cr3+ in gallium garnet laser crystals (1985)
    Springer
    Applied physics 36 (1985), S. 195-201 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 78.40 ; 78.55 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have investigated the basic spectroscopic properties of Cr3+-doped gallium garnets. Weak crystal fields (Dq/B=2.39–2.55) lead to broad4 T 2→4 A 2 fluorescence in the 700–950 nm range depending on the chemical composition of the crystals. At room temperature the4 T 2→4 A 2 transition is homogeneously broadened, whereas the 4 K spectra of the2 E→4 A 2 transition show inequivalent Cr3+ sites and inhomogeneous linewidths of 8 cm−1 in these laser crystals. From 300 to 4 K, the oscillator strength of the4 T 2→4 A 2 transition is reduced by a factor of about 0.6 due to the temperature dependent electron phonon coupling. The transition probability of the2 E→4 A 2 transition correlates with the energetic position of the4 T 2 level, which is admixed into the2 E level via spin-orbit coupling. The comparison of the2 E→4 A 2 phonon sideband structure in garnets of different chemical compositions allows the assignment of some peaks to GaO4-tetrahedron modes of the garnet structure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00704574
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  • 69
    Digitale Medien
    Digitale Medien
    An exact solution for the motion of an ultrarelativistic electron in a tapered undulator (1985)
    Springer
    Applied physics 37 (1985), S. 47-54 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 41 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The equations of motion of an ultrarelativistic (i.e., moving at a speed very close to the speed of light) electron are solved for the one-dimensional motion in the combined fields of a circularly-polarised tapered undulator and a circularly-polarised electromagnetic plane wave, for a special choice of the profile of tapering. The features of an undulator built with this particular profile are investigated, as well as the possibilities to use this solution as a starting point for the approximate analysis of different profiles.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00691692
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  • 70
    Digitale Medien
    Digitale Medien
    Continuous laser emission from sodium atoms by collision assisted two-step excitation (1985)
    Springer
    Applied physics 37 (1985), S. 137-140 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 34
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Continuous laser oscillation on different lines in the spectral range of 1.85 to 3.41 μm, corresponding to transitions between higher lying atomic sodium levels, has been obtained by optical excitation of sodium vapor with Rhodamine 6G dye-laser radiation, tuned either around the 3p−4d resonance (∼ 568 nm) or the 3p−5s resonance (∼ 615 nm). The pump mechanism consists of an atomic two-step excitation as well as an excitation of diatomic sodium molecules and subsequent molecular-atomic collisional energy transfer. Laser operation with low threshold pump power (〈10 mW) and large pump laser detuning (500 GHz) has been observed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692075
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  • 71
    Digitale Medien
    Digitale Medien
    Mercury excimer processes in resonant optically pumped vapour (1985)
    Springer
    Applied physics 37 (1985), S. 223-227 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 34.90 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Absorption measurements are reported at 570 nm in optically excited mercurynitrogen mixtures at low mercury densities such as are found in atomic mercury lasers. The absorbing species is identified as the Hg2(O g ) dimer, and a model for the formation of steady-state dimer and trimer populations, which gives good agreement with the measurements, is described. The absorption gives rise to a loss mechanism in the mercury laser not previously considered, which depends on the intensity of the uv pumping.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692946
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  • 72
    Digitale Medien
    Digitale Medien
    MPD arcs as plasma sources for recombination lasers (1985)
    Springer
    Applied physics 38 (1985), S. 79-89 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60 ; 52.25
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract In this study the decay of argon plasmas ejected from a MPD thruster described in a previous paper is investigated. Various parameters, e.g. the electron densityN e , the electron temperatureT e , and the absorption coefficient α of the ArII-488 nm transition are measured by different experimental techniques. Axial and radial profiles ofN e andT e are determined, and used to decide on the relevant recombination mechanism. In spite of the fact that the dominant three-body recombination favours the population of the high-lying energy levels, population inversions have been observed even with the most sensitive method only in plasmas ejected from a reduced aperture of the MPD thruster. The theoretical analysis shows that the ranges ofT e andN e , in which recombination-lasing may be expected, are narrow. In addition, the mechanisms that limit the population inversions in discharge tubes of conventional Ar+-lasers restrict the dimension of the plasma perpendicular to the resonator axis. From these facts and the described measurements on population inversions we conclude that the initial diameter of the plasma has to be reduced. We therefore propose a new discharge configuration where extended regions of constant plasma parameters can be expected. With this arrangement it should be possible to reach population inversions required for laser oscillations in ArII.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697446
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  • 73
    Digitale Medien
    Digitale Medien
    Excited singlet-state absorption in laser dyes at the XeCl wavelength (1985)
    Springer
    Applied physics 38 (1985), S. 131-137 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 35.20
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The transmission properties of the laser dyes BBQ, PBD, BPBD, α-NPO,p-Quarterphenyl and PPO have been measured using a XeCl (308 nm) excimer laser. A model for the dye saturation which incorporates excited-state absorption was used to estimate the lifetime and the absorption cross section of the first excited singlet-state for each dye.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697452
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  • 74
    Digitale Medien
    Digitale Medien
    Rotating-disk diode-pumped continuous-wave Nd:YAG laser (1995)
    Springer
    Applied physics 61 (1995), S. 525-528 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Continuous-Wave (CW) diode-laser-pumped experiments using rotating Nd: YAG disk(s) have been performed in the input-power range of 1–6 W and rotation-speed range of 0–25 Hz. With a single Nd: YAG disk in the laser cavity, about 1.56 W of output power at 1.06 µm due to the Nd3+ (4 F 3/2−4 I 11/2) transition at an absorbed input power of 4.2 W has been observed, leading to an optical-to-optical conversion efficiency of over 37% and slope efficiency of 52% using 7.5% transmission output coupler. The laser output power has been observed to decrease by either increasing the number of Nd:YAG disks in the cavity or increasing the rotation speed of the disk(s).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081284
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  • 75
    Digitale Medien
    Digitale Medien
    Laser-excited fluorescence of perylene by using self-induced second-harmonic and sum-frequency radiation emanating from high-power AlGaAs double hetero-type diodes (1996)
    Springer
    Applied physics 62 (1996), S. 557-561 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 79.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract High-power (12 W) pulse-operated AlGaAs double-heterostructure lasers with a large thickness of the active layer (1.5 µm) are able to produce internal second-harmonic and sum-frequency generation with a peak power of 10 mW. The corresponding portion of the electroluminescence spectra has a maximum at 405 nm. Clearly resolved mode structures of the fundamental and harmonic radiation are analysed in detail. Particular transverse modes exhibit different conversion efficiencies. Violet resonances without modal precursors in the infrared spectrum make a marked contribution to the light intensity. The harmonic signal serves as an excitation source in photoluminescence studies. A technique of single-photon counting is applied in order to perform spectral measurements under weak-intensity levels. Bright fluorescence spectra of saturated solution of perylene ino-xylene are presented. The spectrum obtained when the solution is illuminated with a gas discharge lamp shows no differences with respect to the positions of the intensity peaks. This allows us to suggest that AlGaAs high-power lasers can be used as convenient excitation sources in photophysics, in particular in time-resolved experiments.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081694
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  • 76
    Digitale Medien
    Digitale Medien
    Counting of particles in aqueous solutions by laser-induced photoacoustic breakdown detection (1996)
    Springer
    Applied physics 63 (1996), S. 299-306 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.80 ; 82.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Laser-induced photoacoustic breakdown detection is applied for the determination of particles in aqueous dispersion. Polystyrene (latex), alumina and thoriasol particles of different sizes are investigated for demonstration. Laser pulses at 500 nm with 28 ns pulse width (FWHM), generated by an excimer (λ = 308 nm) pumped dye laser, are focused into aqueous particle dispersions to produce breakdown. The dye laser pulse energy is fixed at a value lower than the breakdown threshold of pure water to initiate a dielectric breakdown only when particles are present in a given focus volume. Focus volume parameters and particle size dependent breakdown thresholds are calculated and the results are compared with data from literature. Dependence of breakdown threshold values on the chemical composition of the particles is determined for polystyrene, alumina and thoriasol particles.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01833800
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  • 77
    Digitale Medien
    Digitale Medien
    Second-harmonic generation with traveling-wave pulses (1996)
    Springer
    Applied physics 63 (1996), S. 237-242 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.65 ; 42.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We experimentally studied properties of traveling-wave excitation and traveling-wave pulse compression for a Nd : glass laser system with a streak camera. These properties were extended to second-harmonic generation with a type-11 KDP crystal. We found that the second-harmonic pulse generated from the chirped-fundamental pulse also has a good chirp linearity, but the spectral bandwidth and temporal duration were reduced. We demonstrated the effective subpulse suppression in the compressed pulse with the second-harmonic generation. The pulse with tilted wave front, short wavelength and high contrast ratio can be obtained by the second-harmonic generation of traveling-wave pulse.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01833792
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  • 78
    Digitale Medien
    Digitale Medien
    Diode-pumped colour-centre lasers tunable in the 1.5 µm range (1996)
    Springer
    Applied physics 62 (1996), S. 437-442 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Under pumping with a 990 nm, 1 W laser diode, continuous-wave (cw) tunable laser emission in the 1.5 µm wavelength range was obtained from two different colour centres: Tl0(1) in NaCl:Tl+ and (F 2 + )H in NaCl:OH−. The results are compared to those recently obtained with a similar apparatus and Tl0(1) centres in KCl:Tl+. The highest output power (30 mW) and the broadest tuning range (1.48–1.68 µm) were achieved with (F 2 + )H centres.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01081041
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  • 79
    Digitale Medien
    Digitale Medien
    Population densities and optical gain of VUV transitions of Cu II in Cu−He hollow cathode discharges (1985)
    Springer
    Applied physics 36 (1985), S. 5-10 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 52.25 ; 52.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Population densities of excited Cu II-levels between 16 and 25 eV in Cu−He hollow cathode discharges were determined by emission spectroscopy. Population inversion was detected for several 6s-4p transitions. Investigation of the enhancement of Cu II vuv lines in He compared to Ne discharges showed that the excitation of the 6s levels by charge transfer is up to 100 times higher in He than in pure Ne discharges. Using the population densities and known transition probabilities, a single pass gain of 55% m−1 at 780.8 nm and 1.2% m−1 at 154.17 nm at a current density of 0.4 A cm−2 was calculated.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00698029
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  • 80
    Digitale Medien
    Digitale Medien
    Simplified technique for subnanosecond pulse generation and injection mode-locking of a XeCl laser (1985)
    Springer
    Applied physics 36 (1985), S. 181-185 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.65 ; 78.30
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A line narrowed XeCl oscillator/amplifier has been used to generate pulses of ≤100 ps duration by a combination of stimulated Brillouin scattering and optical breakdown. In addition, a Brillouin mirror has been used to control the amplified spontaneous emission in an injection mode-locked XeCl oscillator.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00704572
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  • 81
    Digitale Medien
    Digitale Medien
    Intracavity self-phase modulation and pulse compression in mode-locked lasers (1985)
    Springer
    Applied physics 37 (1985), S. 1-6 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We show that in the presence of a bandwidth-limiting component intracavity selfphase modulation in high power mode-locked and Q-switched lasers is accompanied by interesting pulse-shaping phenomena. If the phase modulation is properly controlled the pulse duration can approach the limit given by the frequency bandwidth of the laser. For example, for a Nd: YAG laser our calculations predict an intracavity pulse compression by approximately a factor of ten over the typical pulse duration of conventional mode-locking.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00691685
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  • 82
    Digitale Medien
    Digitale Medien
    Effect of melting on the excitation of surface acoustic wave pulses by UV nanosecond laser pulses in silicon (1995)
    Springer
    Applied physics 61 (1995), S. 285-298 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 42.55 ; 43.00 ; 62.00 ; 65.00 ; 68.00
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The influence of melting on the excitation of Surface Acoustic Wave (SAW) pulses in silicon is studied both theoretically and experimentally. The developed theory of Rayleigh-type SAW laser-induced thermoelastic excitation in a structure composed of a liquid layer on a solid substrate predicts that the SAW is predominantly generated in the solid phase due to the absence of shear rigidity in a liquid. The characteristic changes in the SAW pulse shape as well as the saturation and even the decrease of the SAW pulse amplitude observed above the melting threshold are explained theoretically to be a result of the decrease of the heat flux into the solid phase as well as due to the decrease of the volume of the solid phase caused by melting. Although the heat flux into the solid phase is decreased both as a consequence of the reflectivity increase and the additional energy losses (latent heat of melting) at the phase transition, it is demonstrated that the influence of reflectivity changes on the SAW pulse is negligible in comparison with the effect of melt-front motion. For laser pulses of 7 ns duration at 355 nm, the threshold value of laser fluence for meltingF m=0.23±0.04 J/cm2 and for the ablationF a=1.3±0.2 J/cm2 were determined experimentally as the points of characteristic changes in the observed SAW pulses.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01538194
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  • 83
    Digitale Medien
    Digitale Medien
    Spectral studies of Nd3+ and Er3+ ions in POCl3:SnCl4 laser liquid (1985)
    Springer
    Applied physics 38 (1985), S. 285-291 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract The optical absorption spectra of triply ionized neodymium and erbium ions in POCl3∶SnCl4 laser liquid have been studied for the first time in the UV-VIS and NIR regions. Spectroscopic and Judd-Ofelt intensity parameters are evaluated from the observed band positions and their intensities. Radiative lifetimes and the luminescent branching ratios for the excited fluorescent levels of Nd3+ and Er3+ ions are theoretically estimated and the possible laser transitions are indicated. From the observed splittings of certain bands in the second-derivative spectrum of the Nd3+ ion, the crystal field (A 20,A 40) parameters are evaluated assumingC 3h symmetry for the ion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00616065
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  • 84
    Digitale Medien
    Digitale Medien
    StimulatedC'-emission of Ag−-centers in KI, RbBr, and CsBr (1985)
    Springer
    Applied physics 38 (1985), S. 61-65 
    Details
    ISSN: 1432-0630
    Schlagwort(e): 42.55 ; 78.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau , Physik
    Notizen: Abstract Stimulated emission around 335 nm in theC' emission band of Ag− centers in KI, RbBr, and CsBr has been observed at low temperatures and the gain coefficient in the band maximum has been determined. Laser action has been demonstrated using a simple broad band cavity.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00618729
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