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Proceedings Paper

X-ray short-pulse generation from femtosecond laser-produced plasmas and its application in pump-probe spectroscopy
Author(s): Hidetoshi Nakano; Peixiang Lu; Tadashi Nishikawa; 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 to the laser pulse. In the first part of this paper, the spectral and temporal properties of the x- ray emitted from plasma created on aluminum film by a femtosecond laser pulse are shown. The minimum pulse duration was < 3 ps as measured by an x-ray streak camera. The energy conversion efficiency, from laser pulse into soft x-ray at 14 +/- 0.05 nm, was 10-6 - 10-5. More than a 30-fold enhancement in soft x-ray emission was achieved by fabricating an array of nanoholes on an alumina surface. In the latter half, we demonstrate time-resolved absorption measurement in the soft x-ray region by means of pump-probe spectroscopy. Using a 10-ps x-ray pulse, we measured time-resolved absorption of optically-pumped silicon near its LII,III edge. We found that laser-pulse irradiation caused a more than 10% increase in soft x-ray absorption near the edge, which means that the transition of electrons in inner shells was rapidly modulated by excitation of valence electrons. The absorption change recovered within 20 ps.

Paper Details

Date Published: 12 March 2001
PDF: 8 pages
Proc. SPIE 4352, Laser Optics 2000: Ultrafast Optics and Superstrong Laser Fields, (12 March 2001); doi: 10.1117/12.418796
Show Author Affiliations
Hidetoshi Nakano, NTT Basic Research Labs. (Japan)
Peixiang Lu, Japan Atomic Energy Research Institute (Japan)
Tadashi Nishikawa, NTT Basic Research Labs. (Japan)
Naoshi Uesugi, Tohoku Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 4352:
Laser Optics 2000: Ultrafast Optics and Superstrong Laser Fields
Alexander A. Andreev; Vladimir E. Yashin, Editor(s)

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