在该系统中，飞秒激光器输出的一束激光首先被分束片分成泵浦光和探测光两束

在该系统中，飞秒激光器输出的一束激光首先被分束片分成泵浦光和探测光两束。强度较高的泵浦光用于加热样品，强度较低的探测光用于通过探测样品表面反射率的变化来检测样品表面温度的变化。延迟位移台用于调节探测光的光程长度，以调节泵浦光和探测光到达样品表面的相对时间延迟。

In this system, a laser beam output by femtosecond laser is first divided into two beams: pump light and probe light. The pump light with higher intensity is used to heat the sample, and the detection light with lower intensity is used to detect the change of sample surface temperature by detecting the change of sample surface reflectivity. The delay displacement table is used to adjust the optical path length of the detection light to adjust the relative time delay of the pump light and the detection light reaching the sample surface.

In this system, a beam of laser output by femtosecond laser is first divided into two beams, pump light and probe light, by beam splitter. The pump light with higher intensity is used to heat the sample, and the probe light with lower intensity is used to detect the change of sample surface temperature by detecting the change of sample surface reflectivity. The displacement stage is used to adjust the optical path length of the probe light to adjust the relative time delay between the pump light and the probe light reaching the sample surface.