Emission of light at half‐integer harmonics of the laser frequency

Calculations have been made of the spectrum of light emitted at half‐integer harmonics of the laser light frequency ω0. The emitted light results from either the Raman scattering of laser light by Langmuir waves or by the direct conversion of Langmuir waves to light. The Langmuir wave amplitude is c...

Full description

Saved in:
Bibliographic Details
Published in:Physics of fluids (1994) 1985-09, Vol.28 (9), p.2895-2909
Main Authors: Berger, R. L., Powers, L. V.
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Calculations have been made of the spectrum of light emitted at half‐integer harmonics of the laser light frequency ω0. The emitted light results from either the Raman scattering of laser light by Langmuir waves or by the direct conversion of Langmuir waves to light. The Langmuir wave amplitude is calculated from convective instability theory for two‐plasmon decay in an inhomogeneous, plane‐stratified medium. The Raman scattering process generates harmonics at (n/2) ω0 where n=1,3,5 ...; however, only for n=1 and 3 is the emission level significant. The conversion process produces (1/2) ω0 light with a comparable efficiency to the Raman scattering process near the two‐plasmon instability threshold. Results of the calculation are in agreement with the general features of measured emission spectra.
ISSN:0031-9171
1070-6631
2163-4998
DOI:10.1063/1.865210