Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
Volume 649, Issue 1, Pages 191-193Publisher
ELSEVIER
DOI: 10.1016/j.nima.2011.01.050
Keywords
Coherent diffraction imaging; Time-resolved diffraction; Ultrafast techniques
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Funding
- Engineering and Physical Sciences Research Council [EP/F020767/1, EP/G068437/1] Funding Source: researchfish
- EPSRC [EP/G068437/1, EP/F020767/1] Funding Source: UKRI
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When a short-pulse laser beam is absorbed in a crystal, the heat or large electric field can induce time-dependent strain waves which propagate in the material at the speed of sound. At a synchrotron, the repetition rate of the X-ray source (MHz) and the laser (kHz) is often mismatched by several orders of magnitude leading to a very inefficient use of the X-ray probe beam. In this paper, we will show how one can synchronize a femtosecond 88 MHz Ti:Sapphire laser to the APS running at the same repetition rate in 324-bunch mode. This efficient use of the X-rays enabled us to measure coherent diffraction patterns from nanoparticle of ZnO as a function of the Bragg angle and time delay between the laser-pump and X-ray probe beams. Significant time-dependent strain can be created with a few nanoJoule per pulse when the nanoparticle is centered in a tight laser focus of a few microns. (C) 2011 Elsevier B.V. All rights reserved.
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