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Proceedings Paper

Hard x-ray emission from intense femtosecond laser-solid target interactions
Author(s): Liming Chen; Patrick Forget; R. Toth; S. Fourmaux; Jean-Claude Kieffer; Andrzej Krol; Charles C. Chamberlain; Bixue X. Hou; John A. Nees; Gerard A. Mourou
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Paper Abstract

Hard x-ray (8-100 keV) spectrum emission from plasma produced by femtosecond laser solid target interactions and Kα x-ray conversion efficiency have been studied as a function of laser intensity (1017 W/cm2 ~ 1019 W/cm2), pulse duration (70 fs ~ 400 fs), laser pulse fluence and laser wavelength (800 nm and 400 nm). The Ag Kα x-ray conversion efficiency produced by a laser pulse at 800 nm with an intensity I = 4x1018 W/cm2 can reach 2x10-5. We discuss the behavior of Kα conversion efficiency scaling laws as a function of the laser parameters. We found that the Kα x-ray conversion efficiency is more dependent on laser fluence than on pulse duration or laser pulse intensity. The conversion efficiency exhibits a similar value at I ~ 1x1018 W/cm2 when we work with a high contrast laser pulse at 400 nm or with a low contrast laser pulse at 800 nm, but in the first case it presents a higher scaling law. Consequently, the use of 400 nm laser pulses could be an effective method to optimize the Kα x-ray emission via vacuum heating mechanisms.

Paper Details

Date Published: 7 January 2004
PDF: 7 pages
Proc. SPIE 5196, Laser-Generated and Other Laboratory X-Ray and EUV Sources, Optics, and Applications, (7 January 2004); doi: 10.1117/12.502299
Show Author Affiliations
Liming Chen, Univ. du Quebec (Canada)
Patrick Forget, Univ. du Quebec (Canada)
R. Toth, Univ. du Quebec (Canada)
S. Fourmaux, Univ. du Quebec (Canada)
Jean-Claude Kieffer, Univ. du Quebec (Canada)
Andrzej Krol, SUNY/Upstate Medical Univ. (United States)
Charles C. Chamberlain, SUNY/Upstate Medical Univ. (United States)
Bixue X. Hou, Univ. of Michigan (United States)
John A. Nees, Univ. of Michigan (United States)
Gerard A. Mourou, Univ. of Michigan (United States)

Published in SPIE Proceedings Vol. 5196:
Laser-Generated and Other Laboratory X-Ray and EUV Sources, Optics, and Applications
George A. Kyrala; Jean-Claude J. Gauthier; Carolyn A. MacDonald; Ali M. Khounsary, Editor(s)

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