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Abstract
The electron-density fluctuation spectra induced by stimulated Compton scattering (SCS) are directly observed for the first time. A CO{sub 2} laser is focused into plasmas with densities {ital n}{sub {ital e}} spanning (0.4--6){times}10{sup 16} cm{sup {minus}3}. The fluctuations corresponding to backscatter are probed using Thomson scattering. At low {ital n}{sub {ital e}}, the scattered spectrum peaks at a frequency shift {Delta}{omega}={ital kv}{sub {ital e}} and appears to be in a linear convectively saturated regime. At the highest {ital n}{sub {ital e}}, a nonlinear saturation of the SCS instability is observed possibly due to a self-induced perturbation of the electron distribution function.
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