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Proceedings Paper

K-alpha x-ray source using high energy and high repetition rate laser system for phase contrast imaging
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Paper Abstract

K-alpha x-ray sources from laser produced plasmas provide completely new possibilities for x-ray phase-contrast imaging applications. By tightly focusing intense femtosecond laser pulses onto a solid target, K-alpha x-ray pulses are generated through the interaction of energetic electrons created in the plasma with the bulk target. In this paper, we present a continuous and efficient Mo K-alpha x-ray source produced by a femtosecond laser system operating at 100 Hz repetition rate with maximum pulse energy of 110 mJ before compression. The source has x-ray conversion efficiency greater than 10-5 into K-alpha line emission. In preparation for phase contrast imaging applications, the size of the resultant K-alpha x-ray emission spot has been also characterized. The source exhibits sufficient spatial coherence to observe phase contrast. We observe a relatively small broadening of the K-alpha source size compared to the size of the laser beam itself. Detailed characterization of the source including the x-ray spectrum and the x-ray average yield along with phase contrast images of test objects will be presented.

Paper Details

Date Published: 28 September 2009
PDF: 9 pages
Proc. SPIE 7451, Soft X-Ray Lasers and Applications VIII, 745115 (28 September 2009); doi: 10.1117/12.826646
Show Author Affiliations
Cristina Serbanescu, INRS-EMT, Univ. du Québec (Canada)
Sylvain Fourmaux, INRS-EMT, Univ. du Québec (Canada)
Jean-Claude Kieffer, INRS-EMT, Univ. du Québec (Canada)
Russell Kincaid, Syracuse Univ. (United States)
Andrzej Krol, Syracuse Univ. (United States)
SUNY Upstate Medical Univ. (United States)

Published in SPIE Proceedings Vol. 7451:
Soft X-Ray Lasers and Applications VIII
James Dunn; Gregory J. Tallents, Editor(s)

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