利用光声光谱技术校准红外波长可调谐激光器

针对可调谐波长红外光源输出波长与实际波长存在偏差,设计了基于光声光谱技术的红外波长校准仪。首先,使用待校准的激光器照射装有气体小分子的光声腔,获得所装载分子的振转精细吸收光谱。然后利用这些简单气体小分子已知且精确的振转光谱峰位置与所得的光声光谱进行对比,最后,通过对比对红外激光器输出激光波长进行校准。本文利用装有甲烷和氨气气体的光声腔获得了本实验室光学参量震荡器(OPO/OPA)相应的波长校正拟合曲线,并成功对其在2 800~3 600 cm;的范围内输出波长进行了校准。本红外光校准仪具有测量范围广,对现有的激光校准仪器有着互补的作用。

Spectrum Correction in Study of Solvation Dynamics by Fluorescence Non-collinear Optical Parametric Amplification Spectroscopy

Femtosecond time-resolved fluorescence non-collinear optical parametric amplification spec- troscopy can extract the curve of spectral gain from its parametric superfluorescence. This unique spectrum correction method enables fluorescence non-collinear optical parametric amplification spectroscopy acquiring the genuine transient fluorescence spectrum of the studied system. In this work we employ fluorescence non-collinear optical parametric amplification spectroscopy technique to study the solvation dynamics of DCM dye in ethanol solution, and confirm that genuine solvation correlation function and shift of peak frequency can be derived from transient fluorescence spectra after the spectral gain correction. It demonstrates that fluorescence non-collinear optical parametric amplification spectroscopy can benefit the research fields, which focuses on both fluorescence intensity dynamics and fluorescence spectral shape evolution.