A technique for high-frequency laser-pump X-ray probe experiments at the APS

作者：Dufresne Eric M^*; Adams Bernhard; Chollet Matthieu; Harder Ross; Li Yuelin; Wen Haidan; Leake Steven J; Beitra Loren; Huang Xiaojing; Robinson Ian K

来源：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment , 2011, 649(1): 191-193.

DOI：10.1016/j.nima.2011.01.050

• Coherent diffraction imaging
• Time-resolved diffraction
• Ultrafast techniques

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.

• 出版日期2011-9-1