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KrF laser-plasma interaction experiments with ns and ps pulses

Published online by Cambridge University Press:  09 March 2009

A. A. Offenberger ,
R. Fedosejevs ,
M. Fujita ,
Y.-Y. Tsui  and
J. N. Broughton
A. A. Offenberger
Affiliation:
Department of Electrical Engineering, University of Alberta, Edmonton, Alberta T6G 2G7, Canada
R. Fedosejevs
Affiliation:
Department of Electrical Engineering, University of Alberta, Edmonton, Alberta T6G 2G7, Canada
M. Fujita
Affiliation:
Department of Electrical Engineering, University of Alberta, Edmonton, Alberta T6G 2G7, Canada
Y.-Y. Tsui
Affiliation:
Department of Electrical Engineering, University of Alberta, Edmonton, Alberta T6G 2G7, Canada
J. N. Broughton
Affiliation:
Department of Electrical Engineering, University of Alberta, Edmonton, Alberta T6G 2G7, Canada
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Abstract

We report on KrF laser-plasma interaction studies at focused intensities up to 4 × 1014 W/cm2 for pulse durations of 1–2 ns and up to 1015 W/cm2 for pulse duration of 100 ps. The longer-pulse experiments are concerned with quantifying two important features of the ablating plasma. Stimulated Brillouin scattering at moderately large L/λ has been measured in detail as a function of intensity, target Z, and angle of incidence θ to compare with modeling calculations of backscatter in inhomogeneous plasma. In addition, electrodynamic charge analyzer measurements have been made for varying intensity and target Z to compare with hydrodynamic calculations of ion expansion and recombination. In the short-pulse experiments, we report on X-ray conversion measurements for 100-ps laser-irradiated targets of varying Z at laser intensities of 1·5 × 1014 and 1015 W/cm2. In particular, it is shown that higher laser intensity leads to a substantial increase in X-ray conversion efficiency.

Type
Research Article
Information
Laser and Particle Beams , Volume 10 , Issue 4 , December 1992 , pp. 661 - 675
Copyright
Copyright © Cambridge University Press 1992

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