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., CA (United States)
• OSTI ID: 376956
• Report Number(s): UCRL-LR--105820-95; ON: DE96013181
• Country of Publication: United States
• Language: English

Related Subjects

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