论文标题
泵探针深色X射线显微镜
Pump-probe Dark-field X-ray Microscopy
论文作者
论文摘要
在带有纳秒驱动激光脉冲和杂交模式X射线探针脉冲的高级光子源（APS）上，在高级光子源（APS）上进行了泵浦探针X射线显微镜（DFXM）实验。我们观察到由于激光诱导的热量扩散而导致的热衰变，与理论预测相匹配，这与晶锗晶晶晶体中的热衰减。单个脉冲DFXM成像与激光泵X射线探针方法结合使用，可以揭示由激光诱导的晶格变形产生的声波“即时”的声波的热应变形成和传播。这将开辟新的材料研究途径，以了解激光诱导的动态现象在亚纳秒时尺度上。
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.
