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  • 42.55 Bi  (1)
  • 42.60  (1)
  • 42.65.Cq  (1)
  • 42.65C  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Polarization effects of picosecond CARS in liquids (1986)
    Springer
    Applied physics 39 (1986), S. 141-147 
    Details
    ISSN: 1432-0649
    Keywords: 42.65.Cq ; 78.30.Cp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Coherent Raman scattering of delayed probing pulses after ultrafast excitation is investigated under generalized polarization conditions. Three factors are shown to contribute to the scattering signal: (i) scattering off the isotropic part of the resonant material excitation via the isotropic component of the Raman polarizability (ii) scattering via the anisotropic part of the Raman polarizability from a second, oriented component of the resonant material excitation (iii) four-wave mixing via the non-resonant part χNR of the third-order susceptibility. We demonstrate theoretically and experimentally that different polarization conditions lead to drastic changes of the signal transients in liquids. For the ring breathing mode of C6H5Br the ratio of non-resonant to resonant contributions is measured to be χNR/χres=0.037±0.015.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697411
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  • 2
    Electronic Resource
    Electronic Resource
    Picosecond pulses and applications (1982)
    Springer
    Applied physics 28 (1982), S. 172-179 
    Details
    ISSN: 1432-0649
    Keywords: 42.60 ; 07.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697843
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of non-exponential dephasing on near-resonant stimulated Raman scattering (1984)
    Springer
    Applied physics 34 (1984), S. 43-48 
    Details
    ISSN: 1432-0649
    Keywords: 35.80 ; 42.65C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The gain characteristics and spectral properties of transient stimulated Raman scattering are investigated in the non-resonant case. For moderate amplification of the input Stokes pulses by a factor of approximately 2 two distinct frequency bands appear in the output Stokes spectrum at the input and resonant frequency positions. The intensity ratio of the two components sensitively depends on pump intensity, frequency off-set and, most important, details of the dynamical properties of the molecular transition. For a quantitative description the simple case of purely exponential dephasing considered previously has to be replaced by a more general theory with correlation time τ4 (relevant for short times) and the asymptotic decay timeT 2. It is shown that the spectral properties of stimulated Raman scattering are strongly effected by τ4. Experimental data for theν 1 CH2 vibration of liquid CH2BrCl are presented. For the first time, τ4 is determined from transient stimulated amplification yielding τ4 = 0.7 ± 0.2ps. Our results on non-exponential dephasing are also relevant for other nonlinear Raman techniques.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697946
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  • 4
    Electronic Resource
    Electronic Resource
    Collective modes — An analytical model for active mode locking in the transient case (1986)
    Springer
    Applied physics 40 (1986), S. 133-139 
    Details
    ISSN: 1432-0649
    Keywords: 42.55 Bi ; 42.60 He
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A novel concept is presented for the pulse generation in the linear regime of an actively loss modulated laser. Introducing collective laser modes, the frequency detuning of the modulator and the statistical initial situation of the laser starting from spontaneous emission become tractable. Formation of a mode-locked pulse is described by the selection of collective modes. Perfect mode locking corresponds to the survival of a single mode in the build-up process. A variety of laser properties is derived from the solution and compared with experiment. The model predicts imperfect mode locking (with a finite number of collective modes) in the transient case in agreement with experimental findings.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697242
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