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Random-phase plate effects on burn-through measurements of laser-irradiated plane-layered targets

Published online by Cambridge University Press:  09 March 2009

R. Evans ,
Z. Ahmad ,
T.A. Hall  and
Y.A. Zakharenkov
R. Evans
Affiliation:
University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ, UK
Z. Ahmad
Affiliation:
University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ, UK
T.A. Hall
Affiliation:
University of Essex, Wivenhoe Park, Colchester, Essex CO4 3SQ, UK
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Abstract

The application of random-phase plates in laser beams to improve the uniformity of target ablation is investigated by combining the simultaneous X-ray and particle emission measurements of ablation characteristics. It is shown that if some hot spots with dimensions of a few µm exist on target they persist at least during the initial stages of the laser interaction process, producing a local maximum in the ablation pressure. Lateral energy transport, inferred from the neutral particle measurements, has little influence on absorbed energy redistribution (only 1% of the energy is transported from the laser focal spot to an outer region of 2 mm size).

Type
Research Article
Information
Laser and Particle Beams , Volume 12 , Issue 1 , March 1994 , pp. 111 - 120
Copyright
Copyright © Cambridge University Press 1994

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