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依据飞秒脉冲测量中的空间-时间耦合理论,通过采用空间分辨和光谱分辨在时间和空间域对飞秒脉冲强度和相位进行测量.测量装置主要由两个光学元件组成,实现了空间和光谱干涉.待测脉冲和参考脉冲通过一个绕中心轴转过某一角度的二维衍射光栅,产生倾斜的二维阵列全息图;一个带通滤波片对全息图进行分离,从而每个全息图含有一个唯一的频率.用照相机记录下所有的全息图,可以在时间和空间域再现出待测脉冲,并给出了测量结果.
According to the space-time coupling theory in femtosecond pulse measurement, the femtosecond pulse intensity and phase are measured in time and space domain by using spatial resolution and spectral resolution.The measuring device is mainly composed of two optical elements, which realize the spatial and spectral Interferometry The pulses to be measured and the reference pulse are generated by tilting a two-dimensional array of holograms with a two-dimensional diffraction grating rotated around a central axis at a certain angle. A band-pass filter separates the holograms so that each hologram contains A unique frequency. All the holograms recorded by the camera, can be reproduced in the time and space domain to be measured pulse, and gives the measurement results.