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全光固体条纹相机采用空间调制抽运光激发平板波导光偏转器,通过精确控制抽运光和信号光之间的时间延迟,实现对入射到波导芯层信号光的偏转扫描.它能有效解决传统变像管条纹相机因空间电荷效应造成的动态范围降低以及光电阴极材料在红外波段探测受限等问题,且结构简单,系统稳定性高,理论时间分辨率可达皮秒甚至亚皮秒量级.本文围绕全光固体条纹相机的核心部件—–AlxGa1-xAs/GaAs/AlxGa1-xAs平板波导光偏转器,研究了在带填充效应、带隙收缩效应以及自由载流子吸收效应作用下GaAs折射率的变化情况;在GaAs折射率变化达到0.01量级,信号光束斑大小和波导宽度之比p=0.5时,得到系统的理论时间分辨率为2 ps;按照静态实验条件求得的理论空间分辨率为17 lp/mm,实验结果显示其值为9 lp/mm.
The all-optical solid streak camera uses the spatial modulation pumping light to excite the slab waveguide deflector so that the deflection scanning of the signal light incident on the waveguide core can be realized by precisely controlling the time delay between the pumping light and the signal light. The conventional variable image tube streak camera has the problems of reduced dynamic range due to the space charge effect and limited detection of the photoelectric cathode material in the infrared band, and has the advantages of simple structure, high system stability, theoretical time resolution of picoseconds or even sub picoseconds Level.In this paper, we focus on the AlxGa1-xAs / GaAs / AlxGa1-xAs slab waveguide optical deflector, which is the core component of the all-optical solid streak camera. The effects of the bandgap effect, bandgap shrinkage effect and free carrier absorption effect on the GaAs The theoretical time resolution of the system is 2 ps when the change of refractive index of GaAs reaches 0.01 order and the ratio of signal spot size to waveguide width p = 0.5. The theoretical space obtained under static experimental conditions The resolution is 17 lp / mm and the experimental result shows it is 9 lp / mm.