Influence of a finite level of ion acoustic waves on Raman gain in inhomogeneous plasma

H C Barr; T J M Boyd; A V Lukyanov

Influence of a finite level of ion acoustic waves on Raman gain in inhomogeneous plasma

H C Barr, T J M Boyd, A V Lukyanov

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

A five-wave Raman scattering process is examined in inhomogeneous plasma in the presence of a finite level of ion acoustic waves. This five-wave interaction is a composite of conventional three-wave stimulated Raman scattering (SRS) followed by the decay of the Raman Langmuir wave into either a second Langmuir wave (LD) or a second scattered light wave (ED) and an ion acoustic wave. The presence of a suprathermal level of ion acoustic waves detunes SRS and inhibits the temporal growth. In inhomogeneous plasma these decays take place locally so that phase matching for both decays is assumed to be coincident. The net Raman convective gain is shown to be sensitive to the source levels of the amplifying waves. For LD the gain may be suppressed or enhanced depending on the relative intensities of the two Langmuir waves. For ED the gain is invariably suppressed. In either case, this occurs for very modest levels of ion acoustic waves. (C) 2000 American Institute of Physics. [S1070-664X(00)04709-1].

Original language	English
Pages (from-to)	3751-3761
Number of pages	11
Journal	Physics of Plasmas
Volume	7
Issue number	9
Publication status	Published - Sept 2000

Keywords

LASER-PRODUCED PLASMAS
STIMULATED BRILLOUIN-SCATTERING
ELECTRON-PLASMA
LANGMUIR DECAY
SATURATION
COEXISTENCE
IGNITION

Cite this

@article{1e69633ca45643d48d4bae88135f2524,

title = "Influence of a finite level of ion acoustic waves on Raman gain in inhomogeneous plasma",

abstract = "A five-wave Raman scattering process is examined in inhomogeneous plasma in the presence of a finite level of ion acoustic waves. This five-wave interaction is a composite of conventional three-wave stimulated Raman scattering (SRS) followed by the decay of the Raman Langmuir wave into either a second Langmuir wave (LD) or a second scattered light wave (ED) and an ion acoustic wave. The presence of a suprathermal level of ion acoustic waves detunes SRS and inhibits the temporal growth. In inhomogeneous plasma these decays take place locally so that phase matching for both decays is assumed to be coincident. The net Raman convective gain is shown to be sensitive to the source levels of the amplifying waves. For LD the gain may be suppressed or enhanced depending on the relative intensities of the two Langmuir waves. For ED the gain is invariably suppressed. In either case, this occurs for very modest levels of ion acoustic waves. (C) 2000 American Institute of Physics. [S1070-664X(00)04709-1].",

keywords = "LASER-PRODUCED PLASMAS, STIMULATED BRILLOUIN-SCATTERING, ELECTRON-PLASMA, LANGMUIR DECAY, SATURATION, COEXISTENCE, IGNITION",

author = "Barr, {H C} and Boyd, {T J M} and Lukyanov, {A V}",

year = "2000",

month = sep,

language = "English",

volume = "7",

pages = "3751--3761",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "9",

}

TY - JOUR

T1 - Influence of a finite level of ion acoustic waves on Raman gain in inhomogeneous plasma

AU - Barr, H C

AU - Boyd, T J M

AU - Lukyanov, A V

PY - 2000/9

Y1 - 2000/9

N2 - A five-wave Raman scattering process is examined in inhomogeneous plasma in the presence of a finite level of ion acoustic waves. This five-wave interaction is a composite of conventional three-wave stimulated Raman scattering (SRS) followed by the decay of the Raman Langmuir wave into either a second Langmuir wave (LD) or a second scattered light wave (ED) and an ion acoustic wave. The presence of a suprathermal level of ion acoustic waves detunes SRS and inhibits the temporal growth. In inhomogeneous plasma these decays take place locally so that phase matching for both decays is assumed to be coincident. The net Raman convective gain is shown to be sensitive to the source levels of the amplifying waves. For LD the gain may be suppressed or enhanced depending on the relative intensities of the two Langmuir waves. For ED the gain is invariably suppressed. In either case, this occurs for very modest levels of ion acoustic waves. (C) 2000 American Institute of Physics. [S1070-664X(00)04709-1].

AB - A five-wave Raman scattering process is examined in inhomogeneous plasma in the presence of a finite level of ion acoustic waves. This five-wave interaction is a composite of conventional three-wave stimulated Raman scattering (SRS) followed by the decay of the Raman Langmuir wave into either a second Langmuir wave (LD) or a second scattered light wave (ED) and an ion acoustic wave. The presence of a suprathermal level of ion acoustic waves detunes SRS and inhibits the temporal growth. In inhomogeneous plasma these decays take place locally so that phase matching for both decays is assumed to be coincident. The net Raman convective gain is shown to be sensitive to the source levels of the amplifying waves. For LD the gain may be suppressed or enhanced depending on the relative intensities of the two Langmuir waves. For ED the gain is invariably suppressed. In either case, this occurs for very modest levels of ion acoustic waves. (C) 2000 American Institute of Physics. [S1070-664X(00)04709-1].

KW - LASER-PRODUCED PLASMAS

KW - STIMULATED BRILLOUIN-SCATTERING

KW - ELECTRON-PLASMA

KW - LANGMUIR DECAY

KW - SATURATION

KW - COEXISTENCE

KW - IGNITION

M3 - Article

SN - 1070-664X

VL - 7

SP - 3751

EP - 3761

JO - Physics of Plasmas

JF - Physics of Plasmas

IS - 9

ER -