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采用反射式达曼光栅对飞秒激光进行分束,可以避免材料色散的影响.搭建了利用反射式1×2达曼光栅为基础的频率分辨光学开关(FROG)装置,并把测量结果与传统多发频率分辨光学开关装置的测量结果进行了对比.理论和实验结果表明,当输入脉冲宽度大于50 fs时,用达曼光栅作为分光器和使用分光镜分光的效果是一样的;当输入脉冲的宽度小于50 fs时,用达曼光栅作为分光器引入的展宽量明显小于分光镜引入的展宽量,尤其是当输入脉冲的宽度小于20 fs时用达曼光栅作为分光器的效果更为突出.
The use of reflective Daman grating to split the femtosecond laser beam can avoid the influence of material dispersion.The frequency resolved optical switch (FROG) device based on the reflective 1 × 2 Daman grating is built and the measurement results are compared with the traditional The results of the theoretical and experimental results show that the effect of using a Dammam grating as a beam splitter and using a spectroscope is the same when the input pulse width is greater than 50 fs; When the width is less than 50 fs, the Daman grating as a beam splitter introduces a significantly smaller amount of broadening than that introduced by a dichroic mirror. Especially when the input pulse width is less than 20 fs, the Daman grating is more effective as a beam splitter.