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Proceedings Paper

Laser ablation and plasma interferometry with a tabletop soft x-ray laser
Author(s): Jorge J. G. Rocca; Jorge Filevich Chamatropulos; Mario C. Marconi; A. Ozols; Kelly Kanizay; Brady R. Benware; Juan L. A. Chilla; Igor A. Artioukov; Yuriy S. Kasjanov; V. V. Kondratenko; Alexander V. Vinogradov
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Paper Abstract

We report the first study of laser ablation and the demonstration of plasma interferometry with a tabletop soft x-ray laser. A capillary discharge pumped Ne-like Ar laser (46.9 nm) was focused using multilayer optics to significantly exceed the energy density necessary for the ablation of metals. Ablation in brass, stainless steel and aluminum samples is reported. The ablation patterns on brass were used in combination with ray tracing computations to characterize the focused soft x-ray laser beam. The radiation intensity within the 2 micrometer diameter central region of the focal spot is estimated to be approximately 1011 W/cm2, with an energy density of approximately 100 J/cm2. In a separate experiment we performed soft x-ray interferometry of a laser-created plasma using a table-top capillary discharge laser operating at 46.9 nm in combination with a novel amplitude division interferometer. The soft x-ray interferometer utilizes diffraction gratings as beam splitters in a Mach-Zehnder configuration to generate high contrast interferograms over a large field of view. This table-top system was used to probe a large-scale (3 mm long) plasma created by a Nd:YAG laser. The short wavelength of the probe laser has allowed mapping of the electron density in plasma regions with density gradients steeper than those that could be probed with the fourth harmonic of Nd:YAG for a plasma of this length.

Paper Details

Date Published: 16 August 2000
PDF: 12 pages
Proc. SPIE 4065, High-Power Laser Ablation III, (16 August 2000); doi: 10.1117/12.407347
Show Author Affiliations
Jorge J. G. Rocca, Colorado State Univ. (United States)
Jorge Filevich Chamatropulos, Colorado State Univ. (Argentina)
Mario C. Marconi, Colorado State Univ. (Argentina)
A. Ozols, Colorado State Univ. (United States)
Kelly Kanizay, Colorado State Univ. (United States)
Brady R. Benware, Colorado State Univ. (United States)
Juan L. A. Chilla, Colorado State Univ. (United States)
Igor A. Artioukov, P.N. Lebedev Physical Institute (Russia)
Yuriy S. Kasjanov, P.N. Lebedev Physical Institute (Russia)
V. V. Kondratenko, P.N. Lebedev Physical Institute (Russia)
Alexander V. Vinogradov, P.N. Lebedev Physical Institute (Russia)

Published in SPIE Proceedings Vol. 4065:
High-Power Laser Ablation III
Claude R. Phipps, Editor(s)

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