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Temporal and spectral features of the (3/2) ω0 spatial fine structure in laser irradiated planar targets

Published online by Cambridge University Press:  09 March 2009

Lin Zunqi ,
Tan Weihan ,
Gu Min ,
Mei Guang ,
Pan Chengming ,
Yu Wenyan  and
Deng Ximing
Lin Zunqi
Affiliation:
Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, Shanghai, P.R.C.
Tan Weihan
Affiliation:
Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, Shanghai, P.R.C.
Gu Min
Affiliation:
Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, Shanghai, P.R.C.
Mei Guang
Affiliation:
Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, Shanghai, P.R.C.
Pan Chengming
Affiliation:
Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, Shanghai, P.R.C.
Yu Wenyan
Affiliation:
Shanghai Institute of Optics and Fine Mechanics, Academia Sinica, Shanghai, P.R.C.
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Abstract

Both temporally and spectrally resolved fine structures of 90° lateral (3/2)ω0 harmonic emission were experimentally observed. The existence of (3/2)ω0 harmonic filaments is attributed to formation from the moving filament bottom at its transient nc/4 surface. The double hump structure with its intense red hump of laterally emitted (3/2)ω0 spectrum can also be explained by a Doppler correction in addition to the thermal correction. Estimation of both red and blue spectral shifts with our simple model is qualitatively consistent with experimental results. Experiments showed that the (3/2)ω0 emission was evidently suppressed by using a broad band laser. This may be promising for superhot electron suppression.

Type
Research Article
Information
Laser and Particle Beams , Volume 4 , Issue 2 , May 1986 , pp. 223 - 230
Copyright
Copyright © Cambridge University Press 1986

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