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Brillouin and dielectric sidescatter of 10-. mu. m light by a plasma

Journal Article · · J. Appl. Phys.; (United States)
DOI:https://doi.org/10.1063/1.328215· OSTI ID:5205862
Sidescatter of CO/sub 2/ laser light from underdense, laser-heated plasmas in H/sub 2/ and He is observed at theta=90/sup 0/. Spectrum, exponentiation, isotropy, and polarization measurements are used to deconvolve two separate mechanisms: (1) Doppler-shifted reflections from moving dielectric discontinuities created in the laser-ionization process, and (2) Stimulated Brillouin scattering seeded by these reflections. The dielectric sidescatter is unpolarized and azimuthally symmetric, similar to the diffuse component of scattering in solid-target experiments. The Brillouin sidescatter saturates at a low level corresponding to an ion wave amplitude of 0.1--1.0%, consistent with previous data on the saturation of backscatter.
Research Organization:
Electrical Sciences and Engineering Department, University of California, Los Angeles, California 90024
OSTI ID:
5205862
Journal Information:
J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 51:8; ISSN JAPIA
Country of Publication:
United States
Language:
English