Abstract
Four-wave-mixing stimulated Raman scattering (SRS) generation of Stokes and anti-Stokes components in and crystals excited by a pulsed laser with a pulse duration of has been investigated. It is shown that, due to the four-wave mixings of SRS components in short () crystals, the generation thresholds of the second and third Stokes components are much lower than the values determined by the cascade SRS mechanism. If the crystal length is increased by a factor of more than four, the mechanism of multiwave SRS becomes similar to the cascade mechanism (without four-wave mixings). Rotation of crystal makes it possible to control the competition of the processes of four-wave-mixing SRS generation of anti-Stokes and second Stokes components.
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