相干反斯托克斯拉曼光谱的实验构型分析

Experimental Configuration Analysis of Coherent Anti-Stokes Raman Spectroscopy

通过相干光学的能量守恒和动量守恒理论,研究分析了相干反斯托克斯拉曼光谱和相干反斯托克斯超拉曼光谱信号出射角随两个入射光频率及角度的变化规律,并通过LabVIEW软件对规律进行了模拟。结果表明,共向式实验构型时,允许的入射光角度过大或过小不利于实验搭建,且出射信号角度变化范围太大不利于收集;而对射式的实验构型时,允许的入射光角度合适利于实验搭建,且便于采集出射信号。研究方法已在二阶非线性光谱学的实验中得到很好的运用,结果对于三、四阶非线性光谱学的实验构型选择具有指导性的意义。

By the energy conservation and momentum conservation theory of coherent optical, the relationships of the emitting light＇ s angle of the coherent anti-Stokes Raman spectrum and the coherent anti-Stokes super Raman spectroscopy with the frequency and angle of the two incident lights are analyzed. And the LabVIEW software is used to simulate the relationship. The simulation results show that, for co-directional experime,ltal configuration, if the permissible angle of the incident light is too large or too small,the experimental structures are hard to be constructed, and if the range of the angle for outgoing signal is too large,the signal is difficult robe collected. For counter-propagation experimental configuration, the permissible angle of the incident light is suitable for the experimental setup, and is easy to collect the exit signal. This research methods have heen well used in the experiments of second order nonlinear spectroscopy, and the results are of guiding significance for the experimental configuration of the third- and fourth-order nonlinear spectroscopy.