Intensity saturation of stimulated Raman scattering by ion-wave coupling

Jukka Heikkinen, Seppo Karttunen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

Nonlinear saturation of stimulated Raman scattering caused by ion‐wave coupling is investigated analytically and numerically. Various linear damping conditions for plasmons and ion‐acoustic waves are included in the analysis. The main results can be summarized in terms of the normalized damping coefficient β (β=Raman gain length/plasmon absorption length), which decreases with the laser intensity I as β∼I1/2. At low intensities (β>4) the Raman reflectivity increases according to the well‐known three‐wave process. At high intensities (0.2<β<2) a steady state still exists and the reflectivity is saturated as a function of the laser intensity. At very high intensities (β<0.1) temporally spiky and chaotic reflectivity is obtained. The reflectivities remain at very low levels, except for large interaction lengths.
Original languageEnglish
Pages (from-to)1291 - 1297
Number of pages7
JournalThe Physics of Fluids
Volume29
Issue number4
DOIs
Publication statusPublished - 1986
MoE publication typeNot Eligible

Fingerprint

Stimulated Raman scattering
Ions
Damping
Plasmons
Lasers

Cite this

Heikkinen, Jukka ; Karttunen, Seppo. / Intensity saturation of stimulated Raman scattering by ion-wave coupling. In: The Physics of Fluids. 1986 ; Vol. 29, No. 4. pp. 1291 - 1297.
@article{abfeb42d4e2844d9bf250812fdbf9182,
title = "Intensity saturation of stimulated Raman scattering by ion-wave coupling",
abstract = "Nonlinear saturation of stimulated Raman scattering caused by ion‐wave coupling is investigated analytically and numerically. Various linear damping conditions for plasmons and ion‐acoustic waves are included in the analysis. The main results can be summarized in terms of the normalized damping coefficient β (β=Raman gain length/plasmon absorption length), which decreases with the laser intensity I as β∼I−1/2. At low intensities (β>4) the Raman reflectivity increases according to the well‐known three‐wave process. At high intensities (0.2<β<2) a steady state still exists and the reflectivity is saturated as a function of the laser intensity. At very high intensities (β<0.1) temporally spiky and chaotic reflectivity is obtained. The reflectivities remain at very low levels, except for large interaction lengths.",
author = "Jukka Heikkinen and Seppo Karttunen",
year = "1986",
doi = "10.1063/1.865878",
language = "English",
volume = "29",
pages = "1291 -- 1297",
journal = "Physics of Fluids",
issn = "1070-6631",
publisher = "American Institute of Physics AIP",
number = "4",

}

Intensity saturation of stimulated Raman scattering by ion-wave coupling. / Heikkinen, Jukka; Karttunen, Seppo.

In: The Physics of Fluids, Vol. 29, No. 4, 1986, p. 1291 - 1297.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Intensity saturation of stimulated Raman scattering by ion-wave coupling

AU - Heikkinen, Jukka

AU - Karttunen, Seppo

PY - 1986

Y1 - 1986

N2 - Nonlinear saturation of stimulated Raman scattering caused by ion‐wave coupling is investigated analytically and numerically. Various linear damping conditions for plasmons and ion‐acoustic waves are included in the analysis. The main results can be summarized in terms of the normalized damping coefficient β (β=Raman gain length/plasmon absorption length), which decreases with the laser intensity I as β∼I−1/2. At low intensities (β>4) the Raman reflectivity increases according to the well‐known three‐wave process. At high intensities (0.2<β<2) a steady state still exists and the reflectivity is saturated as a function of the laser intensity. At very high intensities (β<0.1) temporally spiky and chaotic reflectivity is obtained. The reflectivities remain at very low levels, except for large interaction lengths.

AB - Nonlinear saturation of stimulated Raman scattering caused by ion‐wave coupling is investigated analytically and numerically. Various linear damping conditions for plasmons and ion‐acoustic waves are included in the analysis. The main results can be summarized in terms of the normalized damping coefficient β (β=Raman gain length/plasmon absorption length), which decreases with the laser intensity I as β∼I−1/2. At low intensities (β>4) the Raman reflectivity increases according to the well‐known three‐wave process. At high intensities (0.2<β<2) a steady state still exists and the reflectivity is saturated as a function of the laser intensity. At very high intensities (β<0.1) temporally spiky and chaotic reflectivity is obtained. The reflectivities remain at very low levels, except for large interaction lengths.

U2 - 10.1063/1.865878

DO - 10.1063/1.865878

M3 - Article

VL - 29

SP - 1291

EP - 1297

JO - Physics of Fluids

JF - Physics of Fluids

SN - 1070-6631

IS - 4

ER -