飞秒荧光上转换是一种探测分子超快荧光动力学的新方法．其原理是利用具有大的二阶非线性系数的晶体（如ＫＤＰ和ＢＢＯ）的和频作用，将飞秒光激发产生的荧光与飞秒基频激光进行和频．通过改变基频光与荧光的相对光程差，可以获得飞秒分辨的荧光衰减动力学图像．本试验的基频 Femtosecond fluorescence upconversion is a new method for detecting ultra-fast fluorescence kinetics of molecules. The principle is to use the sum frequency function of crystals with large second-order nonlinear coefficients (such as KDP and BBO) to sum the femtosecond excitation fluorescence with femtosecond fundamental laser. By changing the relative optical path length difference between the fundamental frequency and the fluorescence, we can obtain the fluorescence decay dynamic image with femtosecond resolution. The basic frequency of this test