Measurements of the 3ω0/2 emission from laser-irradiated targets at 0.53 μm were made at three angles over a wide range of laser bandwidths with and without induced spatial incoherence (ISI) echelons. The 3ω0/2 emission was found to be correlated with hard x rays but not Raman spectra, suggesting that the 3ω0/2 radiation was due to two-plasmon decay. Reduction of both 3ω0/2 emission and the accompanying hard x rays by ISI required five to ten times larger bandwidths than needed to suppress stimulated Raman scattering and stimulated Brillouin scattering.
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Peyser et al. (1991) studied this question.
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