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Focusing the beam of a compact, repetitively pulsed x-ray laser to study the interaction of radiation with metallic targets and x-ray reflectometry

Date

2000

Authors

Chilla, J. L. A., author
Rocca, Jorge J., author
Ozols, A., author
Macchietto, C. D., author
Kondratenko, V. V., author
Kas'yanov, Yu. S., author
Vinogradov, A. V., author
Benware, B. R., author
Artioukov, I. A., author
Kvantovaya Elektronika and Turpion Ltd., publisher

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Abstract

The interaction of focused soft x-ray laser radiation with metallic targets was studied experimentally. The radiation of a capillary-discharge Ne-like Ar ion laser (λ = 46.9 nm) with a repetition rate of 1 Hz was focused on the surface of metallic samples by using a spherical Si/Sc multilayer mirror. The radiation intensity at the target surface was far greater than the threshold for laser ablation of the materials in use - aluminum, brass, and stainless steel. A study of the shape of laser craters in relation to the position of the caustic of the focusing mirror, combined with computer ray-tracing simulations, made it possible to determine the radiation intensity distribution in the focal region of the mirror. The radiation energy density in the 2 μm central domain of the focal spot was 102 J cm-2, and the corresponding intensity was 1011 W cm-2. The reflectivity of a Si/Sc multilayer mirror was measured as a function of the angle of incidence of the radiation.

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