Phase-Modulated Parametric Anti-Stokes Stimulated Raman Scattering of Cherenkov-Type in Self-Focusing Areas of Exciting Radiation
DOI:
https://doi.org/10.15407/ujpe57.10.1000Keywords:
-Abstract
The influence of the speed of the focal point under self-modulation of the phase and self-focusing on the frequency-angular radiation spectra of a parametric stimulated Raman scattering (SRS) anti-Stokes component is considered. The phase self-modulation of both exciting and scattered anti-Stokes radiation is taken into consideration. The creation of broadened anti-Stokes frequency-angular bands is explained. The most intense frequency-angular bands, which are described by relations typical of the Cherenkov radiation, are generated when the speed of the self-focused focal point coincides with the phase velocity of a nonlinear polarization at the anti-Stokes Raman frequency and the phase velocity of a scattered axial radiation. In particular,
under the excitation by nanosecond laser pulses, such bands in toluene reach shifts of ≈–200 cm–1 relatively to the anti-Stokes Raman frequency.
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