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  • 1
    Electronic Resource
    Electronic Resource
    High-field cooperative transport phenomena and screening in phase-separated degenerate antiferromagnetic semiconductors (1994)
    Springer
    The European physical journal 96 (1994), S. 31-37 
    Details
    ISSN: 1434-6036
    Keywords: 72.20 ; 74.20 ; 75.50.P
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Response to a strong electric field is investigated of degenerate antiferromagnetic semiconductors EuTe spontaneously separated into antiferromagnetic and ferromagnetic phases. Whereas in weak fields their response is Ohmic, in strong fields a sequence of very high peaks appears over the Ohmic-type background beginning from a certain threshold field strength. Their spacing decreases with increasing field strength. These peaks are explained by cooperative motion of charged ferromagnetic microregions inside the antiferromagnetic host. The screening by these microregions is investigated theoretically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01313012
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  • 2
    Electronic Resource
    Electronic Resource
    Photophysical properties and laser performance of photostable UV laser dyes (1988)
    Springer
    Applied physics 45 (1988), S. 279-284 
    Details
    ISSN: 1432-0649
    Keywords: 07.65 ; 33 ; 42.55 ; 82.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00687157
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  • 3
    Electronic Resource
    Electronic Resource
    Laser-induced grating self-diffraction from a medium with induced absorption (1988)
    Springer
    Applied physics 45 (1988), S. 113-120 
    Details
    ISSN: 1432-0649
    Keywords: 78.65 ; 72.20 ; 72.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract There are a great variety of optical nonlinearities that can lead to the phenomenon of laser-induced gratings (LIG) in semiconductors. In the present contribution the dynamic behaviour of an induced absorber with intrinsic bistability is investigated under excitation in a LIG self-diffraction arrangement. Using CdS as a model substance, the comparison of our theoretical model with our experimental findings gives an insight into the nonlinear dynamics of the degenerate carrier system and also an estimation of the transport properties of the electron-hole plasma.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00695278
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  • 4
    Electronic Resource
    Electronic Resource
    Group theory and experiments on helical and linear distributed feedback gas lasers (1984)
    Springer
    Applied physics 33 (1984), S. 115-131 
    Details
    ISSN: 1432-0649
    Keywords: 02.20 ; 42.55 ; 42.60D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract This study puts forward the concept of helical distributed feedback (DFB) lasers. The basic features of this new type of laser are derived by group theoretical considerations on cylindrical, circular linear periodic, and helical waveguide and laser structures. It is demonstrated that not only linear periodic structures but also helical structures show Bragg and DFB effects. Microwave and far-infrared experiments on passive helical metal waveguides reveal Bragg resonances in transmission. These results initiated the first experimental realization of a helical DFB gas laser, i.e. an optically pumped 496μm CH3F laser with a helical metal waveguide of a pitch close to 250μm. This helical DFB laser shows higher-mode selectivity than the corresponding linear DFB laser. Finally, we show that the concept of helical DFB also applies to dye lasers with internal DFB incorporated by a mixture of the dye with a cholesteric liquid crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00688518
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  • 5
    Electronic Resource
    Electronic Resource
    Submillimetre laser lines from CH3OH pumped by a13C18O2 pump laser: Observations and assignments (1984)
    Springer
    Applied physics 34 (1984), S. 17-21 
    Details
    ISSN: 1432-0649
    Keywords: 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Twenty-four new optically pumped submillimetre laser lines have been observed when CH3OH is excited using a13C18O2 pump laser. Four of these lines have been assigned to transitions involving the CO stretching band. In addition to these lines, a further six new lines have been observed when pumping with12C18O2 and13C16O2 lasers. One of these lines has been assigned to a transition involving the CO stretching band. The observation of infrared-infrared double resonance signals in CH3OH has allowed the prediction of a further six laser lines which should be excited using a13C18O2 pump laser.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697459
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  • 6
    Electronic Resource
    Electronic Resource
    Coherent effects in inverse compton scattering in the high frequency region (1984)
    Springer
    Applied physics 34 (1984), S. 221-228 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 ; 41
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The conditions under which a cooperative emission from different friges occurs in the scattering between a relativistic electron beam and two interfering laser beams are discussed. In particular, the conditions to have an electron grating are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697638
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  • 7
    Electronic Resource
    Electronic Resource
    A continuously tunable GaAs diode laser with an external resonator (1989)
    Springer
    Applied physics 49 (1989), S. 29-32 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 ; 42.60B
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332122
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  • 8
    Electronic Resource
    Electronic Resource
    Bistability and passive Q-switching of a CO2 laser with saturable absorber (1984)
    Springer
    Applied physics 35 (1984), S. 77-82 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The coexistence of bistability and repetitive passive Q-switching of a CO2 laser with a gaseous saturable absorber has been investigated experimentally. With CH3F as the saturable absorber bistability has been observed simultaneously with passive Q-switching, whereas with CH3OH either one of these phenomena can only exist, as demonstrated for the first time. The measured features of both systems can be explained qualitatively by rate-equation theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697426
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  • 9
    Electronic Resource
    Electronic Resource
    Optically pumped submillimetre laser action in formaldoxime and ammonia (1984)
    Springer
    Applied physics 35 (1984), S. 127-129 
    Details
    ISSN: 1432-0649
    Keywords: 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Strong submillimetre laser action has been obtained on five lines of a new laser gas, formaldoxime. Several new emission lines have also been produced by isotopic CO2 laser pumping of14NH3 and15NH3. One of these lines at 102.9 μm is a rotation-inversion transition in the 2v 2 state, and is the first example of cw laser action in such a highly excited state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697700
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  • 10
    Electronic Resource
    Electronic Resource
    Amplified spontaneous emission in short-pulse excimer amplifiers (1990)
    Springer
    Applied physics 51 (1990), S. 71-74 
    Details
    ISSN: 1432-0649
    Keywords: 42.60 ; 42.55
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have found a simple analytical expression which describes the relation between amplified spontaneous emission (ASE) and small-signal gain in short-pulse amplifiers. It is also shown that the contrast of the short pulse to the ASE is weakly dependent on the saturation of the ASE, and influenced mainly by the saturation of the short pulse. The theoretical considerations were verified by measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332330
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