高效率光导开关光学系统的设计

Design of High-Efficiency Photoconductive Switch Optical System

为了提高光导开关的光生载流子密度,延长器件的使用寿命,降低对光源的能量需求,实现设备的小型化,基于半绝缘4H-SiC材料建立了全内反射式光导开关数学模型,并分析了全内反射发生的条件及影响光导开关吸收效率和均匀度的因素。采用ZEMAX非序列模式建立了全内反射光导开关模型,并利用光线追迹方法进行分析。设计了一种高效率全内反射光导开关光学系统,结果表明,该光学系统能在获得高吸收效率的同时保证高均匀度,吸收效率可达90.78%,吸收均匀度达到74.56%。

In order to increase the photo-generated carrier density of the photoconductive switche, prolong the service life of the device, reduce the energy requirement of the light source, and realize the miniaturization of the device, we establish a mathematical model of the total internal reflection photoconductive switch based on the semiinsulating 4 H-Si C material. The conditions of total internal reflection and the factors that affect photoconductive switches absorption efficiency and uniformity are analyzed. The non-sequential mode in ZEMAX is used to establish a total internal reflection photoconductive switch model, and the ray tracing method is adopted for analysis. A highefficiency total internal reflection photoconductive semiconductor switches optical system is designed. The results show that the optical system can achieve high absorption efficiency while ensuring high uniformity. The absorption efficiency can reach 90. 78% and the absorption uniformity can reach 74. 56%.