Evidence of parametric instabilities in second harmonic spectra from 1054 nm laser-produced plasmas

Journal Article · Wed Aug 01 04:00:00 EDT 1984 · Phys. Fluids; (United States)

DOI:https://doi.org/10.1063/1.864845· OSTI ID:6853832

Tanaka, K; Seka, W; Goldman, L M; Richardson, M C; Short, R W; Soures, J M; Williams, E A

Second harmonic spectra emitted from 1054 nm laser-produced plasmas have been observed in side- and backscattering and are shown to have angularly dependent, complex structures. Sidescattered spectra show regularly spaced (approx.20 A) Stokes components at intensities above 5 x 10/sup 13/ W/cm/sup 2/. The Stokes components are polarized and stronger in the plane of the polarization of the incident laser. These Stokes components are interpreted to be caused by a combination of electron plasma waves generated by the parametric decay instability and the subsequent electron decay instability. Backscattered spectra show additional finely spaced red-shifted satellites above 4 x 10/sup 14/ W/cm/sup 2/, indicative of the electron decay instability of plasmons generated from resonance absorption.

• Research Organization: Laboratory for Laser Energetics, University of Rochester, 250 East River Road, Rochester, New York 14623
• DOE Contract Number: AC08-80DP40124
• OSTI ID: 6853832
• Journal Information: Phys. Fluids; (United States), Journal Name: Phys. Fluids; (United States) Vol. 27:8; ISSN PFLDA
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
700108* -- Fusion Energy-- Plasma Research-- Wave Phenomena
BACKSCATTERING
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
HARMONICS
INFRARED RADIATION
INSTABILITY
LASER-PRODUCED PLASMA
OSCILLATIONS
PARAMETRIC INSTABILITIES
PLASMA
PLASMA INSTABILITY
PLASMA MACROINSTABILITIES
POLARIZATION
RADIATIONS
RED SHIFT
SCATTERING
SPECTRA