Modeling the effects of laser-beam smoothing on filamentation and stimulated Brillouin backscattering

Technical Report · Sat Jun 01 00:00:00 EDT 1996

DOI:https://doi.org/10.2172/376956· OSTI ID:376956

Berger, R. L.; Kaiser, T. B.; Lasinski, B. F. ^[1]

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1. and others

Using the three-dimensional code (F3D), the authors compute the filamentation and backscattering of laser light. The results show that filamentation can be controlled and stimulated Brillouin backscattering (SBBS) can be reduced by using random phase plates (RPP) and small f-numbers or smoothing by spectral dispersion (SSD) with large bandwidth. An interesting result is that, for uniform plasmas, the SBBS amplification takes place over several laser axial coherence lengths (coherence length = speckle length).

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• OSTI ID: 376956
• Report Number(s): UCRL-LR-105820-95; ON: DE96013181; TRN: 96:004685-0022
• Resource Relation: Other Information: PBD: Jun 1996; Related Information: Is Part Of Inertial confinement fusion. 1995 ICF annual report, October 1994--September 1995; PB: 407 p.
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION
LASER RADIATION
BRILLOUIN EFFECT
BACKSCATTERING
LASER-PRODUCED PLASMA
THREE-DIMENSIONAL CALCULATIONS
F CODES
COMPUTERIZED SIMULATION
PROGRESS REPORT