Statistical properties of laser hot spots produced by a random phase plate

Journal Article · Mon Feb 01 04:00:00 EST 1993 · Physics of Fluids B; (United States)

DOI:https://doi.org/10.1063/1.860545· OSTI ID:6987736

Rose, H A; DuBois, D F ^[1]

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1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

A quantitative theory of laser hot spots, which control plasma instabilities in real laser--plasma interactions, is presented in the case of random phase plate (RPP) optics. It is shown that the probability density of intense hot spots with intensity [ital I], [ital P][sub hot]([ital I]), is given by [ital P][sub hot]([ital I])[similar to]([ital I]/[ital I][sub 0][sup 2])exp([minus][ital I]/[ital I][sub 0]) where [ital I][sub 0] is the average intensity, and that the detailed amplitude and phase variation of the laser field in the vicinity of an intense hot spot is uniquely specified by the optics and is [ital deterministic]. These hot spots may be the source of below threshold stimulated Raman scattering (SRS) and its variation with [ital I][sub 0] is shown to be super exponential. A brief preview of a quantitative nonlinear theory of hot-spot-induced laser filamentation is presented.

• OSTI ID: 6987736
• Journal Information: Physics of Fluids B; (United States), Journal Name: Physics of Fluids B; (United States) Vol. 5:2; ISSN 0899-8221; ISSN PFBPEI
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700350* -- Plasma Production
Heating
Current Drive
& Interactions-- (1992-)
BEAM-PLASMA SYSTEMS
ELECTROMAGNETIC RADIATION
HOT SPOTS
INSTABILITY
LASER RADIATION
LASER-PRODUCED PLASMA
MATHEMATICS
PLASMA
PLASMA INSTABILITY
RADIATIONS
RAMAN EFFECT
STATISTICS