Improved apparatus for picosecond pump-and-probe optical measurements
Improved apparatus for picosecond pump-and-probe optical measurements
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DOI：
10.1063/1.1147100
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发表时间：
1996-08-01
影响因子：
1.6
通讯作者：
Maris, HJ
中科院分区：
文献类型：
--
作者：
Capinski, WS;Maris, HJ
提出了一种改进的泵浦-探针光学时间范围从皮秒到纳秒的方法。在这种类型的测量中，使用泵浦光脉冲来激发样品，并通过相对于泵浦脉冲的时间延迟的探针脉冲来研究由此产生的光学性质的变化。在这种类型的大多数测量中，采用机械级来引入探针脉冲的可变时间延迟。当探头相对于泵浦的时间延迟在几百皮秒以上时，由于阶段运动的缺陷、对准问题和探头光束的发散问题，很难进行精确的测量。为了克服这些困难，我们开发了一种利用单模光纤的装置。为了证明该系统的性能，我们给出了测量从薄膜到衬底的热量流动的实验结果。(C) 1996年美国物理研究所。
We present an improved method for making pump-and-probe optical picosecond to nanosecond time range. In this type of measurement, a pump light pulse is used to excite the sample and the resulting changes in the optical properties are investigated by means of a probe pulse that is time-delayed relative to the pump pulse. In most measurements of this type, a mechanical stage is used to introduce the variable time delay of the probe pulse. As a result of imperfections in the stage motion, alignment problems, and divergence of the probe beam, it has been difficult to make accurate measurements when the time delay of the probe relative to the pump is in the range above a few hundred picoseconds. To overcome these difficulties, we have developed an apparatus that utilizes a single-mode optical fiber. In order to demonstrate the performance of this system, we present results of experiments in which the flow of heat from a thin film into a substrate has been measured. (C) 1996 American Institute of Physics.