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X-ray Diffraction Study of Laser-Material Interactions with an Ultrafast Table-Top X-ray Source

Published online by Cambridge University Press:  10 February 2011

T. Guo ,
C. Rose-Petruck ,
R. X. Jimenez ,
J. A. Squier ,
B. C. Walker ,
K. R. Wilson  and
C. P. J. Barty
T. Guo
Affiliation:
Dept. of Chem. and Biochem., University of California, San Diego, La Jolla, CA 92093-0339
C. Rose-Petruck
Affiliation:
Dept. of Chem. and Biochem., University of California, San Diego, La Jolla, CA 92093-0339
R. X. Jimenez
Affiliation:
Dept. of Chem. and Biochem., University of California, San Diego, La Jolla, CA 92093-0339
J. A. Squier
Affiliation:
ECE Department, University of California, San Diego, La Jolla, CA 92093-0339
B. C. Walker
Affiliation:
Dept. of Chem. and Biochem., University of California, San Diego, La Jolla, CA 92093-0339
K. R. Wilson
Affiliation:
Dept. of Chem. and Biochem., University of California, San Diego, La Jolla, CA 92093-0339
C. P. J. Barty
Affiliation:
Institute for Nonlinear Science, University of California, San Diego, La Jolla, CA 92093-0339
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Abstract

X-ray diffraction, employing a table-top, laser-driven x-ray source, has been used to investigate laser-material interactions with simultaneous picosecond and subatomic range distance resolution. The x-ray source, consisting of a table-top terawatt laser system and a moving Cu wire target apparatus, generates ˜ 5 × 1010 photons (4π steradians s)−1 of Cu Kα radiation. The lattice dynamics of the (111) planes of GaAs single crystals has been studied after the crystal is exposed to intense femtosecond laser pulses. The diffraction results have yielded information about the timescale of the lattice dynamics in the picosecond range and an upper limit for the width of the xray pulses. Initial strain, defined as the percentage of lattice distortion resulted from the laser illumination, is as high as 0.25% and is followed by an exponential decay with a time constant of ˜ 150 ps. Increases in the diffraction intensity after the laser irradiation have also been observed, likely due to a transition from dynamic to kinematic diffraction associated with degradation of the crystal.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 502: Symposium II – In Situ Process Diagnostics & Intelligent Materials Processing , 1997 , 77
Copyright
Copyright © Materials Research Society 1998

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