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

Journal Article · Sun Sep 01 04:00:00 EDT 1985 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.865210· OSTI ID:5292837

Berger, R L; Powers, L V

Calculations have been made of the spectrum of light emitted at half-integer harmonics of the laser light frequency ..omega../sub 0/. 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) ..omega../sub 0/ where n = 1,3,5 ...; however, only for n = 1 and 3 is the emission level significant. The conversion process produces (1/2) ..omega../sub 0/ 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.

• Research Organization: KMS Fusion, Inc., Ann Arbor, Michigan 48106
• DOE Contract Number: AC08-82DP40152
• OSTI ID: 5292837
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 28:9; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
CONVERSION
ELECTROMAGNETIC RADIATION
EMISSION
HARMONICS
INHOMOGENEOUS PLASMA
INTERACTIONS
LASER RADIATION
LIGHT TRANSMISSION
NONLINEAR PROBLEMS
OSCILLATIONS
PHOTON EMISSION
PLASMA
PLASMA WAVES
RADIATIONS
STRATIFICATION