Abstract
Stimulated Raman scattering (SRS) of a third-harmonic beam of ahigh-power laser in air is analysed by using a perturbation approach.It is found that intensity modulations of the third-harmonic beam,resulting from the surface ripple of nonlinear crystal, can besignificantly enhanced due to SRS, and the gain of instabilityincreases with the spatial period of modulation. Numerical simulationsbased on the nonlinear coupled-wave equations verify the validity ofthe perturbation approach.
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