Cournoyer A, Baulaigue P, Lazarides E, Blancher H, Bertrand L, Occelli R
Appl Opt. 1997 Jul 20;36(21):5252-61. doi: 10.1364/ao.36.005252.
We present a numerical study of the behavior of the signal in a photothermal experiment combining the mirage effect and a Jamin interferometer. Our analysis is limited to a square-pulse excitation by a weakly absorbed Gaussian pump laser beam with a large radius. We investigate the influence of three parameters: the time of illumination of the sample, the time of extinction of the pump beam, and the height of the probe-beam arm of the Jamin interferometer above the sample. We show that the path difference, which induces the variation of intensity at the output of the Jamin interferometer, is caused by both probe-beam deflection and temperature variation of the refractive index of air above the sample. The first effect is dominant for short times, and interferometry is a sensitive tool to monitor it.
我们对结合了海市蜃楼效应和雅满干涉仪的光热实验中信号的行为进行了数值研究。我们的分析限于由具有大半径的弱吸收高斯泵浦激光束进行的方脉冲激发。我们研究了三个参数的影响：样品的光照时间、泵浦光束的消光时间以及雅满干涉仪的探测光束臂在样品上方的高度。我们表明，在雅满干涉仪输出端引起强度变化的光程差是由探测光束的偏转和样品上方空气折射率的温度变化共同引起的。第一种效应在短时间内占主导，干涉测量是监测它的灵敏工具。
