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  • Artikel  (62)
  • Artikel: DFG Deutsche Nationallizenzen  (62)
  • 42.65  (27)
  • 82.65  (21)
  • thermal expansion  (14)
  • 2020-2024
  • 1985-1989  (62)
  • 1988  (62)
  • Physik  (62)
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  • Artikel  (62)
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  • Artikel: DFG Deutsche Nationallizenzen  (62)
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  • 2020-2024
  • 1985-1989  (62)
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  • 11
    Digitale Medien
    Digitale Medien
    Amplification in photorefractive materials via a higher order wave (1988)
    Springer
    Applied physics 45 (1988), S. 125-128 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65 ; 42.40 ; 42.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract It is shown that power exchange is possible in photorefractive materials even though the grating produced by the two incident waves is in phase with their interference pattern. The reason is that the interaction of the principal waves will produced higher order waves and their presence will form further gratings which assist power transfer between the principle beams. Under favourable conditions significant amounts of power may be transferred.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00695280
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  • 12
    Digitale Medien
    Digitale Medien
    Switching dynamics of optical bistable devices (1988)
    Springer
    Applied physics 45 (1988), S. 157-162 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The switching dynamics of optical bistable devices is studied and some recent results are reviewed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00695285
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  • 13
    Digitale Medien
    Digitale Medien
    H2 vibrational CARS thermometry (1988)
    Springer
    Applied physics 47 (1988), S. 41-46 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract TheQ-branch spectra of molecular hydrogen have been used to determine rotational temperatures bycoherentanti-StokesRamanscattering (CARS). A supersonic jet expansion through a constant flow nozzle of adjustable temperature served as hydrogen source in the temperature range 300 to 2500 K. The analysis of the high-temperature data reveals details of the internal energy transfer in jet expansion.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00696207
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  • 14
    Digitale Medien
    Digitale Medien
    Isotopically selective CVD of silicon by IRMPD of Si2F6 (1988)
    Springer
    Applied physics 47 (1988), S. 243-245 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.50 ; 82.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The IRMPD of Si2F6 by a CO2 TEA laser was applied to isotopically selective CVD of silicon. A white film, probably consisting of polymers of SiF2, was deposited on a metal foil during the irradiation of natural Si2F6 with the laser radiation at 951.19 cm−1 and about 1.5 J cm−2. Upon heating, the film became dark brown, evolving SiF4. The30Si content was found to be as high as about 20%.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697344
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  • 15
    Digitale Medien
    Digitale Medien
    Full pump energy conversion at parametric amplification (1988)
    Springer
    Applied physics 47 (1988), S. 359-360 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The full conversion of the modulated wave energy is shown to be possible and can be reached at mutually simple conformity between the spatial-temporal, modulation forms of interaction waves.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00716098
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  • 16
    Digitale Medien
    Digitale Medien
    Exciton-related optical nonlinearities in semiconductors and semiconductor microcrystallites (1988)
    Springer
    Applied physics 46 (1988), S. 19-25 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 71 ; 42.65 ; 42.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We report on large optical nonlinearities due to specific many-body effects in high-density electron-hole pair systems. On bulk CdS we study the effect of free-carrier screening on the absorption and refraction in the vicinity of the band-gap at room temperature. Steady-state saturable absorption at mW-power levels and four-wave mixing with first-order efficiencies as large as 2% of the incoming light are demonstrated on a 1μm slab. On CuBr microcrystallites embedded in glass we investigate the changes of the exciton absorption caused by many-exciton effects both at cryo and room temperature. In contrast to bulk semiconductors, we observe a blue shift of the exciton peak at resonant optical excitation. In addition, strong saturation of absorption with very large contrast shows up. We find Lorentzian saturation intensities in the 100 kW/cm2 range.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00698650
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  • 17
    Digitale Medien
    Digitale Medien
    The influence of photoinduced structural distortions on interband absorption in polyacetylene (1988)
    Springer
    Applied physics 45 (1988), S. 21-25 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65 ; 63.20.Kr
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Picosecond pump and probe experiments were carried out on fully oriented transpolyacetylene. Exciting the sample at 527 nm, photoinduced bleaching and absorption were observed at 527 nm and 1054 nm, respectively. The measurements give an upper limit of 2 ps for the relaxation time of the photogenerated 0.5 eV hot carriers to the band edges. The evaluation of the measured optical processes strongly suggests the conclusion that photoinduced structural distortions of the polyacetylene chain result in observable transient decrease of the interband absorption. This may be ascribed to the reduction of the density of electronic states and to that of the interband transition matrix element of the momentum operator.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692336
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  • 18
    Digitale Medien
    Digitale Medien
    Atom-density distribution in a metal vapor cell studied by third-harmonic generation (1988)
    Springer
    Applied physics 45 (1988), S. 47-52 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.65 ; 42.80
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The density distribution of Cs atoms in a metal-vapor cell designed for nonlinear optical and spectroscopic measurements has been investigated by the THG technique. For high heater powers the desnity-distribution function was found to display a dip in the central part of the cell. Explanation of the phenomenon and criteria to eliminate it are proposed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00692341
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  • 19
    Digitale Medien
    Digitale Medien
    Pump-pulse induced chirp production in semiconductors (1988)
    Springer
    Applied physics 45 (1988), S. 71-75 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.10 ; 42.65
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Nonlinear absorption and refractive index changes in wide-gap semiconductors (CdS, CdSSe, and GaSe) after ps light irradiation are determined with an excite-and-probebeam spectrometer. Based on a simple model pump-pulse induced chirp parameters on a signal pulse of different wavelength are calculated. Possible applications are discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00694318
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  • 20
    Digitale Medien
    Digitale Medien
    Optical bistability in fluorescein dyes (1988)
    Springer
    Applied physics 45 (1988), S. 137-144 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 33 ; 42.65 ; 42.70
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Optical bistability has been observed in highly concentrated fluorescein dye solutions and in thin (≈1 μm) doped polymeric films. At concentrations larger than 10−5 mole/l dye dimers are formed. For fluorescein dye, the dimer-monomer equilibrium constant is 105 l/mole so that most of the dye species are in the dimer form. At 480 nm the dimer absorption cross section is 10−18 cm2/molecule, while that for the dye monomer molecule is 7.6×10−17 cm2/molecule. Upon laser excitation dimers dissociate to form monomers thus providing a highly nonlinear laser induced absorption. This high nonlinear absorption coefficient can be utilized for optically bistable response of the dye system. Optical bistability was observed by placing dye solutions or dye thin films inside a Fabry-Perot resonator and exciting it with 480 nm dye laser pulses of 10 ns duration. The effect is more pronounced in 10−4 mole/l fluorescein than in 10−6 mole/l fluorescein in which dimer formation is not that efficient. In disodium fluorescein no significant dimer formation is observed even at 10−3 mole/l dye concentration. The observed bistability both in solution and in thin films can be explained in terms of recent models for optical bistability in nonlinearly absorbing molecular systems.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00695282
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