Random phase plate hot spots and their effect on stimulated Brillouin backscatter and self-focusing
- Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
Laser hot spots, as determined by Random Phase Plate (RPP) hot spots, control the critical value of the average intensity, {ital I}{sub {ital c}}, at which there is a rapid onset of stimulated scatter in the strongly damped convective regime of three wave parametric instabilities. For the case of stimulated Brillouin backscatter in a long scale length plasma, nascent hot spot ponderomotive self-focusing is shown to reduce the value of {ital I}{sub {ital c}} in the regime of very strongly damped acoustic waves. RPP hot spots have two, intrinsically nonlinear, thresholds for ponderomotive self-focusing. Large intensity amplifications occur in the hot spot neighborhood when the hot spot power exceeds a certain critical power, {ital P}{sub {ital c}}, which is independent of the optic`s {ital f} number, {ital F}. When the second, {ital F}-dependent, hot spot power threshold is exceeded, a filament emerges from the far side of the hot spot, whose extent grows erratically in time.
- OSTI ID:
- 55882
- Journal Information:
- Physics of Plasmas, Journal Name: Physics of Plasmas Journal Issue: 6 Vol. 2; ISSN PHPAEN; ISSN 1070-664X
- Country of Publication:
- United States
- Language:
- English
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