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Plasma ion spectra from laser produced plasmas at λ = 1·06 μm and λ =0·53 μm

Published online by Cambridge University Press:  09 March 2009

R. Dinger ,
K. Rohr  and
H. Weber
H. Weber
Affiliation:
Universität Kaiserslautern, Fachbereich Physik, D-6750 Kaiserslautern, W.-Germany
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Abstract

Wavelength dependent absorption in laser-plasma interactions was investigated by measuring the energy spectra of freely expanding plasmas in their asymptotic stage of expansion. The experiments were performed with both 1·06- and 0·53-μm-wavelength light incident on flat tantalum targets. The experimental conditions were chosen adequately to ensure that inverse bremsstrahlung was the dominating absorption mechanism. As a result it is found that the absorption is enhanced at the shorter wavelength by a factor of 1·3. Primarily this leads to a higher ionisation state of the plasma and higher kinetic ion energies and temperatures, respectively, while the amount of ablated mass is approximately the same.

Type
Research Article
Information
Laser and Particle Beams , Volume 4 , Issue 2 , May 1986 , pp. 239 - 247
Copyright
Copyright © Cambridge University Press 1986

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