Ultrafast pump-probe microscopy with high temporal dynamic range
Ultrafast pump-probe microscopy with high temporal dynamic range
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DOI：
10.1364/oe.20.010330
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发表时间：
2012-04-23
期刊：
影响因子：
3.8
通讯作者：
Huber, Heinz P.
中科院分区：
文献类型：
--
作者：
Domke, Matthias;Rapp, Stephan;Huber, Heinz P.
超快泵浦-探测显微术是短脉冲和超短脉冲激光烧蚀的时间和空间分辨成像的常用方法。烧蚀泵浦脉冲和照射探测脉冲之间的时间延迟通过光学延迟来调谐，从而对于高达几ns的延迟时间产生几百飞秒的时间分辨率，或者通过电子延迟来调谐，从而对于更长的延迟时间产生几纳秒的分辨率。在这项工作中，我们联合收割机两种延迟类型的时间高分辨率的完整的烧蚀过程的观察范围从飞秒到微秒，而烧蚀是由超快660 fs的激光泵浦脉冲。为此，我们还演示了延迟时间零点的校准，两个探头源的同步，以及图像质量增强的方法。此外，我们提出了第一次，我们的知识泵探测显微镜调查的完整的衬底侧选择性烧蚀过程中的钼膜玻璃。在约400 ps处观察到机械膜变形的开始，持续直到约15 ns，于是Mo盘由于直接诱导的激光剥离烧蚀过程而被剪切掉而不受热效应的影响。(C)2012美国光学学会
Ultrafast pump-probe microscopy is a common method for time and space resolved imaging of short and ultra-short pulse laser ablation. The temporal delay between the ablating pump pulse and the illuminating probe pulse is tuned either by an optical delay, resulting in several hundred femtoseconds temporal resolution for delay times up to a few ns, or by an electronic delay, resulting in several nanoseconds resolution for longer delay times. In this work we combine both delay types for temporally high resolved observations of complete ablation processes ranging from femtoseconds to microseconds, while ablation is initiated by an ultrafast 660 fs laser pump pulse. For this purpose, we also demonstrate the calibration of the delay time zero point, the synchronization of both probe sources, as well as a method for image quality enhancing. In addition, we present for the first time to our knowledge pump-probe microscopy investigations of the complete substrate side selective ablation process of molybdenum films on glass. The initiation of mechanical film deformation is observed at about 400 ps, continues until approximately 15 ns, whereupon a Mo disk is sheared off free from thermal effects due to a directly induced laser lift-off ablation process. (C) 2012 Optical Society of America