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Collisionless absorption of femtosecond laser pulses in plasmas by nonlinear forces

Published online by Cambridge University Press:  09 March 2009

M. T. Batchelor  and
R. J. Stening
M. T. Batchelor
Affiliation:
Department of Theoretical Physics, University of New South Wales, Kensington 2033, Australia
R. J. Stening
Affiliation:
Department of Theoretical Physics, University of New South Wales, Kensington 2033, Australia
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Abstract

A mechanism has been discussed before by Dragila and Hora where very short laser pulses in a homogeneous plasma can be absorbed without collisions by the action of time dependent nonlinear forces. The resulting absorption lengths are of interest for the study of femtosecond neodymium glass laser pulses or the sub-picosecond carbon dioxide laser pulses which are now available. A mathematically more rigorous treatment of this problem is presented where a nonlinear differential equation is derived for the general solution in the approximation of Klima and Petrzilka. The ordinary differential equation can be solved exactly. With reasonable initial conditions, the solutions are similar to those of Dragila and Hora and are evaluated numerically for cases of experimental interest.

Type
Research Article
Information
Laser and Particle Beams , Volume 3 , Issue 2 , May 1985 , pp. 189 - 196
Copyright
Copyright © Cambridge University Press 1985

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