INFLUENCE OF SPATIAL AND TEMPORAL LASER-BEAM SMOOTHING ON STIMULATED BRILLOUIN-SCATTERING IN FILAMENTARY LASER-LIGHT

Authors
BERGER RL LASINSKI BF LANGDON AB KAISER TB AFEYAN BB COHEN BI STILL CH WILLIAMS EA
Citation
Rl. Berger et al., INFLUENCE OF SPATIAL AND TEMPORAL LASER-BEAM SMOOTHING ON STIMULATED BRILLOUIN-SCATTERING IN FILAMENTARY LASER-LIGHT, Physical review letters, 75(6), 1995, pp. 1078-1081
Citations number
22
Categorie Soggetti
Physics
Journal title
Physical review letters → ACNP
ISSN journal
00319007
Volume
75
Issue
6
Year of publication
1995
Pages
1078 - 1081
Database
ISI
SICI code
0031-9007(1995)75:6<1078:IOSATL>2.0.ZU;2-0
Abstract
Three-dimensional simulations are presented which calculate the time-d ependent, self-consistent evolution of filamentation and stimulated Br illouin backscatter (SBBS) in nonuniform laser beams with intense hot spots. The simulations show significant reflectivity (>1%) for modest average-intensity gain exponents (5-10). Many hot spots cooperate to p roduce a total SBBS amplification that increases with the plasma lengt h as well as hot-spot length. Temporal beam smoothing with bandwidth c omparable to the SBBS growth rate substantially reduces the nonuniform -laser-beam reflectivity.