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Stimulated Raman backscattering at high laser intensities

Abstract

Signatures of Stimulated Raman backscattering of a short-pulse high-intensity laser interacting with an underdense plasma are discussed. We introduce a nonlinear three-wave interaction model that accounts for laser pump depletion and relativistic detuning. A mechanism is revealed based on a generic route to chaos, that predicts a progressive increase of the backscatter complexity with a growing laser intensity. Importance of kinetic effects is outlined and demonstrated in fluid-hybrid and particle simulations. As an application, we show that spectral anomalies of the backscatter, predicted by the above model, are consistent with recent sub-picosecond, high-intensity laser gas-target measurements at Livermore and elsewhere. Finally, a recently proposed scheme for generation of ultra-short, low-prepulse laser pulses by Raman backscattering in a thin foil target, is shown. (author)
Authors:
Skoric, M M; [1]  Tajima, Toshiki; Sasaki, Akira; Maluckov, A; Jovanovic, M
  1. Vinca Inst. of Nuclear Sciences, Belgrade (Yugoslavia)
Publication Date:
Mar 01, 1998
Product Type:
Technical Report
Report Number:
JAERI-Conf-98-004; CONF-9707120-
Reference Number:
SCA: 665300; PA: JPN-98:011207; EDB-99:022034; SN: 99002049911
Resource Relation:
Conference: 1. JAERI-Kansai international workshop on ultrashort-pulse ultrahigh-power lasers and simulation for laser-plasma interactions, Kyoto (Japan), 14-18 Jul 1997; Other Information: PBD: Mar 1998; Related Information: Is Part Of Proceedings of the first JAERI-Kansai international workshop on ultrashort-pulse ultrahigh-power lasers and simulation for laser-plasma interactions; PB: 200 p.
Subject:
66 PHYSICS; LASERS; BACKSCATTERING; RAMAN EFFECT; X-RAY LASERS; PLASMA; REFLECTIVITY; PULSES; ABSORPTION SPECTRA; COMPUTERIZED SIMULATION; THEORETICAL DATA
OSTI ID:
307665
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
English
Other Identifying Numbers:
Other: ON: DE99701543; TRN: JP9811207
Availability:
OSTI as DE99701543
Submitting Site:
JPN
Size:
pp. 64-69
Announcement Date:

Citation Formats

Skoric, M M, Tajima, Toshiki, Sasaki, Akira, Maluckov, A, and Jovanovic, M. Stimulated Raman backscattering at high laser intensities. Japan: N. p., 1998. Web.
Skoric, M M, Tajima, Toshiki, Sasaki, Akira, Maluckov, A, & Jovanovic, M. Stimulated Raman backscattering at high laser intensities. Japan.
Skoric, M M, Tajima, Toshiki, Sasaki, Akira, Maluckov, A, and Jovanovic, M. 1998. "Stimulated Raman backscattering at high laser intensities." Japan.
@misc{etde_307665,
title = {Stimulated Raman backscattering at high laser intensities}
author = {Skoric, M M, Tajima, Toshiki, Sasaki, Akira, Maluckov, A, and Jovanovic, M}
abstractNote = {Signatures of Stimulated Raman backscattering of a short-pulse high-intensity laser interacting with an underdense plasma are discussed. We introduce a nonlinear three-wave interaction model that accounts for laser pump depletion and relativistic detuning. A mechanism is revealed based on a generic route to chaos, that predicts a progressive increase of the backscatter complexity with a growing laser intensity. Importance of kinetic effects is outlined and demonstrated in fluid-hybrid and particle simulations. As an application, we show that spectral anomalies of the backscatter, predicted by the above model, are consistent with recent sub-picosecond, high-intensity laser gas-target measurements at Livermore and elsewhere. Finally, a recently proposed scheme for generation of ultra-short, low-prepulse laser pulses by Raman backscattering in a thin foil target, is shown. (author)}
place = {Japan}
year = {1998}
month = {Mar}
}