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On absorption of the laser radiation in a plasma with subcritical density

Published online by Cambridge University Press:  09 March 2009

V. V. Alexandrov ,
N. G. Kovalsky ,
M. I. Pergament  and
A. M. Rubenchik
V. V. Alexandrov
Affiliation:
Kurchatov Institute of Atomic Energy, Moscow, USSR
N. G. Kovalsky
Affiliation:
Kurchatov Institute of Atomic Energy, Moscow, USSR
M. I. Pergament
Affiliation:
Kurchatov Institute of Atomic Energy, Moscow, USSR
A. M. Rubenchik
Affiliation:
Kurchatov Institute of Atomic Energy, Moscow, USSR
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Abstract

Absorption, reflection and scattering of laser radiation have been studied in experiments with oblique incidence of Nd glass laser beams on plane massive targets of polyethylene, aluminium and copper. Time behaviour of 2ω and 3/2;ω harmonic intensities and their angular distributions were measured along with plasma X-ray spectra in the flux density range 1013 to 3×1014 W/cm2 for 3.5 nsec laser pulses. Comparison of the experimental data with the results of the theoretical analysis and numerical calculations is presented and relatively strong absorption of about 10% is estimated in the quarter critical density region of the plasma corona due to the two-plasmon decay instability growth. The hard X-ray component in the X-ray spectrum disappears at large angles of incidence, hence the supra-thermal electron generation and two-plasmon instability are proven to be coupled phenomena.

Type
Research Article
Information
Laser and Particle Beams , Volume 2 , Issue 2 , May 1984 , pp. 213 - 221
Copyright
Copyright © Cambridge University Press 1984

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