The threshold intensity for excitation of the stimulated Raman backscatter instability has been measured at 9.58 μm in a well-diagnosed plasma free of Brillouin scattering. The initial level of density fluctuations was independently measured by ruby laser scattering. The observed threshold of 1×1011 W/cm2 is somewhat below the calculated ‘‘absolute’’ threshold for underdense plasmas, and the apparent noise level is higher than that measured directly.
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Amini et al. (1986) studied this question.
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