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计算了普遍采用的二阶单发自相关仪光路中的分束片的色散引起的超短脉冲展宽量 ,指出在脉冲极短时该展宽将导致不准确的测量结果 (例如 ,对于脉冲宽度为 3fs左右 ,通过 10 0 μm厚度的K9玻璃分束片 ,脉冲展宽将达到 10 % )。基于计算结果 ,提出了一种新型的采用全反射结构的单发二阶自相关仪设计 ,通过分波面的方法改变了自相关仪的分束方式 ,避免了采用透射分束光学元件引起的色散。采用这种全反射式结构的二阶单发自相关仪 ,可以使自相关测量方法测得的脉冲宽度更为准确 ,计算得出理论上其最小时间分辨率可达 3 6fs。
The ultrashort pulse broadening caused by the dispersion of the beamsplitters in the commonly used second-order single-autocorrelator optical path was calculated, indicating that this broadening would result in inaccurate measurements at very short pulses (for example, for pulse widths 3 fs or so, the pulse broadening will reach 10% through K9 glass splits with a thickness of 10 μm. Based on the calculation results, a new single-order second-order autocorrelator design with total reflection structure is proposed. The splitting mode of the autocorrelator is changed by the method of decoupling wavefront, which avoids the dispersion caused by the transmitted beam splitting optical element . The second-order single-shot autocorrelator with total reflection structure can make the pulse width measured by the autocorrelation measurement method more accurate, and the theoretical minimum time resolution can be up to 36 fs.