由于超短脉冲测量系统中存在透射元件,脉冲经过测量系统时将被展宽,因此测量结果中存在较大的误差。针对脉冲测量中被展宽的问题,设计了一种全反式超短脉冲测量系统,可实现对更短的超短脉冲的测量。所设计的系统利用菲涅耳双面镜产生时间延迟,利用柱面反射镜、薄晶体和光栅产生光谱,避免了系统中色散的产生。在满足采样率的前提下,对频率分辨光学开关(FROG)迹线采样范围进行分析,获得测量系统所需的时间延迟和倍频带宽,并以此为约束条件,推导了待测脉冲的脉冲宽度与菲涅耳双面镜和柱面反射镜参数的关系。

While passing through an ultra-short-pulse measurement system, the pulse will be broadened owing to the presence of transmission elements. The broadening of the pulse results in significant errors in the final measurement results. To address this problem, a total-reflective ultra-short-pulse measurement system is designed to realize the measurement of shorter ultra-short pulse. In this system, Fresnel bi-mirror is used to generate time delays and a cylindrical mirror, thin crystals, and gratings are used to generate spectra, preventing the generation of dispersion in the system. Under the premise of satisfying the sampling rate requirement, the sampling range of the frequency-resolved optical gating trace is analyzed to obtain the required time delay and frequency-doubling bandwidth. With this constraint, the relationship between the width of the pulse to be measured and parameters of Fresnel bi-mirror and cylindrical mirror is deduced herein.