arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2210.06243cond-mat.mtrl-sciphysics.optics
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泵浦-探测暗场X射线显微术

Pump-probe Dark-field X-ray Microscopy

Ishwor Poudyal, Zhi Qiao, Arndt Last, Michael R. Armstrong, Zahir Islam

摘要:

在先进光子源(APS)上利用纳秒激光脉冲和混合模式X射线探测脉冲进行了泵浦-探测暗场X射线显微术(DFXM)实验。我们观察到的热衰减,由于激光诱导的热扩散在锗单晶,这符合理论预测。单脉冲DFXM成像与激光泵浦X射线探针方法相结合,可以揭示热应变的形成和由激光诱导晶格变形产生的声波的传播。这将开辟一个新的途径,材料研究激光诱导的动力学现象在固体在亚纳秒的时间尺度。

英文摘要:

A pump-probe dark-field X-ray microscopy (DFXM) experiment was carried out at the Advanced Photon Source (APS) with nanosecond drive laser pulses and hybrid mode X-ray probe pulses. We observe a thermal decay due to laser-induced heat diffusion in a Germanium single crystal which matches the theoretical prediction. The single pulse DFXM imaging in combination with the laser-pump X-ray probe method could reveal thermal strain formation and propagation of the acoustic wave "on-the-fly" generated by a laser-induced lattice deformation. This will open a new avenue of materials research on laser-induced dynamic phenomena in solids at sub-nanosecond time scales.

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