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  • Artikel  (467)
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  • Springer  (467)
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  • 11
    Digitale Medien
    Digitale Medien
    Design of a self-injected unstable cavity Nd: YAG Laser (1986)
    Springer
    Applied physics 39 (1986), S. 131-134 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A detailed analysis of a self-injected Nd: YAG laser with an unstable cavity is presented. With respect to the normal Q-switched laser-mode operation the pulse peak power is increased by a factor of eight with a pulse length of about 1 ns. Moreover single transverse mode operation is achieved, with divergence near the diffraction limit. An evaluation of the most significant parameters useful for the design of an unstable resonator for self-injection applications is also presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694808
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  • 12
    Digitale Medien
    Digitale Medien
    Detailed analysis of active mode-locking (1986)
    Springer
    Applied physics 40 (1986), S. 141-146 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We extend earlier work on the theory of active mode-locking in a laser with a very long gain recovery time and obtain approximate closed-form solutions. We show how the results can be reduced to the well-known Kuizenga and Siegman formulae in the limit of small modulation depth and large laser bandwidth. We also discuss the physical relevance of the cavity “supermodes” in determining the stability properties of the mode-locked laser. We show that when the modulation depth is too small or the bandwidth too large, different supermodes have similar energies and we argue that under these circumstances, the laser will not be able to sustain mode-locked operation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697243
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  • 13
    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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  • 14
    Digitale Medien
    Digitale Medien
    A 3% efficiency N2 laser (1986)
    Springer
    Applied physics 41 (1986), S. 241-244 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A 3% efficiency, crossed-field type, N2 laser (337.1 nm) has been developed, based on very low inductance circuits (coaxial configuration) and a careful selection of their resonance frequencies.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697405
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  • 15
    Digitale Medien
    Digitale Medien
    Picosecond pulses and applications (1982)
    Springer
    Applied physics 28 (1982), S. 172-179 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60 ; 07.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697843
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  • 16
    Digitale Medien
    Digitale Medien
    Theory of synchronously pumped dye lasers (1983)
    Springer
    Applied physics 30 (1983), S. 135-142 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60 ; 42.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An analysis of cw synchronously pumped dye lasers is presented. Under the assumption that the cavity (tuning element) bandwidth is much wider than the bandwidth of the transform limited pulses generated, the pulse forming dynamics is rigorously treated. It is shown that for a finite mismatch between the lengths of the dye and the pump lasers, a steady-state pulse develops in the dye laser cavity with a conserved pulseshape. The characteristics (energy, shape, peak power, duration) of these pulses of ultimate width are quantitatively determined as a function of cavity mismatch. An analytical solution for the pulse envelope is determined, which yieldsI(t)∝Sech2(t/t p ) to a good approximation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00695468
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  • 17
    Digitale Medien
    Digitale Medien
    Laser atomic photoionization spectral analysis of element traces (1983)
    Springer
    Applied physics 30 (1983), S. 161-176 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 32 ; 42.50 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A new method for determining trace amounts of elements in a substance has been developed. It is based on thermal evaporation and atomization of a substance in vacuum and detection of the released trace atoms by the laser stepwise photoionization technique. A rather effective way of detecting atoms is their multistep excitation to Rydberg states by the radiation of tunable dye lasers with their subsequent ionization by electric field pulses. The analytical laser spectrometer consisting of several tunable, pulsed dye lasers, a vacuum chamber with an atomizer and a recording system is described. The microimpurities of elements have been detected in pure materials: the contents of Na impurities in CdS crystals (2×10−6%) and Al impurities in germanium (2×10−7%). The detection limit of about 10−9% was determined. A technique for direct determination of the content of elements in natural water and human blood is described. A high sensitivity, universality and other merits of the method enable it to be used in determining traces of many important elements at a level of 10−8 to 10−11% almost in any matrix.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00688402
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  • 18
    Digitale Medien
    Digitale Medien
    Amplification and measurement of single 1.6–3.5 ps Pulses generated by a distributed feedback dye laser (1983)
    Springer
    Applied physics 31 (1983), S. 1-4 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have shown that distributed feedback dye lasers are capable of generating single transform-limited pulses of 1.6–3.5 ps duration when pumped by a mode-locked Nd: YAG laser. A short-pulse amplifier has been constructed in which the level of amplified spontaneous emission could be kept below 10−3 by properly taking into account the polarization anisotropy of the gain and by precise timing of the pump pulses. A sensitive autocorrelator is described which allows to measure pulse duration in a single shot.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00693898
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  • 19
    Digitale Medien
    Digitale Medien
    A discussion of the problem of determining multiple lifetimes from picosecond absorption recovery data as encountered in two carbocyanine dyes (1983)
    Springer
    Applied physics 31 (1983), S. 235-247 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60 ; 42.65 ; 61.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Absorption recovery kinetics data on the picosecond time-scale of a high signalto-noise ratio can be obtained by using continuously operating synchronously modelocked dye lasers. We show that such data make it possible to determine multiple exponential decays with small differences in rate constants. We also show that an absolute prerequisite to accomplish this is that the measurements are performed at a number of different wavelengths, and that the decays are monitored in a time interval corresponding to several lifetimes. These considerations are demonstrated by measurements on two carbocyanine dyes, DQOCI and pinacyanol, respectively.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00690794
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  • 20
    Digitale Medien
    Digitale Medien
    A cw uv copper hollow cathode laser in the 260 nm region (1983)
    Springer
    Applied physics 32 (1983), S. 127-135 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.55 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract A cw uv copper hollow cathode laser is described, which could be operated for a longer time duration with an output power of 7 mW in the 260 nm region. A double-cathode configuration with a protection for the mirrors from metal-vapour deposition is presented. Characteristics of the laser output power, the spontaneous emission, and the ion densities in the negative glow were measured as depending on the discharge current, the neon gas pressure, and the size of the cathode slit. The observed saturation of the laser output power at high discharge current (1 A/cm2) and the optimum slot size are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00688818
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