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为了提高飞秒激光瞬态热反射测量技术的测量精度并增加测试的可靠性,延长了泵浦光和探测光的相对光程差,以提高实验数据与理论模型间的拟合精度.通过在泵浦光路中放置一个和探测光路中同样的机械位移平台,搭建了一个新的测试实验台,将两光束的光程差由4 ns提高到8 ns.测量结果表明,当后4ns的测量数据与前4 ns的数据平滑连接后,泵浦光和探测光束间由于发散和飘移所引起的测量误差可忽略不计.对Al/Si和Cr/Si样品界面热导的测量结果表明,实验测得值和现有文献报道数据非常吻合,证实了改进系统的可靠性.
In order to improve the measurement accuracy of the transient thermal reflection measurement technology and increase the reliability of the test, the relative optical path length difference between the pump light and the probe light is prolonged so as to improve the fitting accuracy between the experimental data and the theoretical model. A similar mechanical displacement platform was set up in the pump light path and a new test bench was set up to increase the optical path difference of the two beams from 4 ns to 8 ns.The measurement results show that when the measurement data of 4 ns After the smooth connection with the first 4 ns data, the measurement errors between the pump light and the probe beam due to the divergence and drift are negligible.The measurement results of the interface thermal conductance of Al / Si and Cr / Si samples show that the experimentally measured The value is very consistent with the existing literature data, confirming the reliability of the improved system.