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In a series of experiments on the Omega laser facility at LLE, we havedemonstrated the suppression of SRS in prescribed spectral windows due to thepresence of externally controlled levels of ion acoustic waves (IAW, bycrossing two blue beams at the Mach -1 surface) and electron plasma waves (EPW,by crossing a blue and a green beam around a tenth critical density plasma)generated via optical mixing. We have further observed SRS backscattering of agreen beam when crossed with a blue pump beam, in whose absence, that (greenbeam) backscattering signature was five times smaller. This is direct evidencefor green beam amplification when crossed with the blue. Additional proof comesfrom transmitted green beam measurements. A combination of these techniques mayallow the suppression of unacceptable levels of SRS near the light entrancehole of large-scale hohlraums on the NIF or LMJ.

Optical Mixing Controlled Stimulated Scattering instabilities:  Suppression of SRS by the Controlled Introduction of Ion Acoustic and  Electron Plasma Wave Turbulence