Experimental investigations of the mechanisms of excitation of plasma waves and generation of harmonics in a plasma produced by an intense laser pulse
The interaction mechanism between laser radiation (lambda=1.06..mu..) and a high-temperature plasma is investigated for light fluxes between 10/sup 12/W/cm/sup 2/ and 4 x 10/sup 14/W/cm/sup 2/. A comparison of the measurement results obtained by various methods indicates that at light fluxes exceeding approx.10/sup 13/W/cm/sup 2/, effective absorption of the radiation is due to the development of decay instabilities t..-->..p+s and t..-->..p+p. It is found that radiation of frequency (3/2) ..omega../sub 0/ emitted by the plasma is due to Raman scattering by the plasma waves with frequencies close to ..omega../sub 0//2. The experimental values of the threshold light fluxed obtained with targets made of various materials are in good agreement with the predictions of the theory.
- OSTI ID:
- 7301908
- Journal Information:
- Sov. Phys. - JETP (Engl. Transl.); (United States), Vol. 44:5
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LASER-PRODUCED PLASMA
PLASMA WAVES
ABSORPTION
DECAY INSTABILITY
EXCITATION
FREQUENCY DEPENDENCE
LASER RADIATION
RAMAN EFFECT
ELECTROMAGNETIC RADIATION
ENERGY-LEVEL TRANSITIONS
INSTABILITY
PLASMA
PLASMA INSTABILITY
RADIATIONS
700108* - Fusion Energy- Plasma Research- Wave Phenomena