Laser ablation and plasma interferometry with a tabletop soft x-ray laser

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

doi:10.1117/12.407347

16 August 2000 Laser ablation and plasma interferometry with a tabletop soft x-ray laser

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

Author Affiliations +

Proceedings Volume 4065, High-Power Laser Ablation III; (2000) https://doi.org/10.1117/12.407347
Event: High-Power Laser Ablation, 2000, Santa Fe, NM, United States

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.

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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, and Alexander V. Vinogradov "Laser ablation and plasma interferometry with a tabletop soft x-ray laser", Proc. SPIE 4065, High-Power Laser Ablation III, (16 August 2000); https://doi.org/10.1117/12.407347

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KEYWORDS

Laser ablation

Plasma

X-ray lasers

Mirrors

Interferometers

Interferometry

Nd:YAG lasers

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