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Proceedings Paper

Time-resolved soft x-ray absorption spectroscopy using femtosecond laser plasma x-rays
Author(s): Hidetoshi Nakano; Tadashi Nishikawa; Katsuya Oguri; Naoshi Uesugi
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Paper Abstract

High density plasmas created near a solid surface by a femtosecond laser pulse emit ultrashort x-ray pulses that are synchronized with the laser pulse. We show the spectral and temporal properties of broadband soft x-rays emitted from a femtosecond laser-produced on a metal surface. The minimum pulse duration was < 5 ps. We achieved an approximately 20-fold enhancement of the soft x-ray emission by fabricating an array of nanocylinders on a gold surface. We measured the duration of the soft x-ray emitted from the laser produced plasma by the cross-correlation method using an optical field-induced ionization process in Kr gas. Utilizing a 10-ps soft x-ray pulse, we measured the time- resolved soft x-ray absorption of optically excited silicon near its LII,III edge. We found that laser-pulse irradiation caused a more than 10% increase in the soft x- ray absorption near the edge, which recovered within 20 ps. From experimental results, we assume the origin of this absorption change to be the bandgap renormalization of Si. We also employed picosecond soft x-rays to measure the spatiotemporal evolution of ablated particles in Al plasma created by a 100-fs laser pulse.

Paper Details

Date Published: 9 August 2002
PDF: 10 pages
Proc. SPIE 4762, ALT'01 International Conference on Advanced Laser Technologies, (9 August 2002); doi: 10.1117/12.478668
Show Author Affiliations
Hidetoshi Nakano, NTT Basic Research Labs. (Japan)
Tadashi Nishikawa, NTT Basic Research Labs. (Japan)
Katsuya Oguri, NTT Basic Research Labs. (Japan)
Naoshi Uesugi, NTT Basic Research Labs. (Japan)

Published in SPIE Proceedings Vol. 4762:
ALT'01 International Conference on Advanced Laser Technologies
Dan C. Dumitras; Maria Dinescu; Vitali I. Konov, Editor(s)

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