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Title: Beyond the random phase approximation: Stimulated Brillouin backscatter for finite laser coherence times

We developed a linear theory of backward stimulated Brillouin scatter (BSBS) of a spatially and temporally random laser beam relevant for laser fusion. Our analysis reveals a new collective regime of BSBS (CBSBS). Its intensity threshold is controlled by diffraction, once cT{sub c} exceeds a laser speckle length, with T{sub c} the laser coherence time. The BSBS spatial gain rate is approximately the sum of that due to CBSBS, and a part which is independent of diffraction and varies linearly with T{sub c}. The CBSBS spatial gain rate may be reduced significantly by the temporal bandwidth of KrF-based laser systems compared to the bandwidth currently available to temporally smoothed glass-based laser systems.
Authors:
;  [1] ;  [2] ;  [3] ;  [4]
  1. Department of Mathematics and Statistics, University of New Mexico, Albuquerque, New Mexico 87131 (United States)
  2. (Russian Federation)
  3. Theoretical Division, Los Alamos National Laboratory, MS-B213, Los Alamos, New Mexico 87545 (United States)
  4. (United States)
Publication Date:
OSTI Identifier:
22407985
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 1; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BACKSCATTERING; DIFFRACTION; LASERS; PHOTON BEAMS; RANDOM PHASE APPROXIMATION; RANDOMNESS