大视场反射式激光扩束系统光学设计

激光扫描捕获系统通过对激光光源进行扩束变换，压缩光源的发散角度，可减少在远距离传输中的能量损失。为满足某通信实验需要，设计一种放大倍率为10倍，光源扫描视场为4840的小型扩束系统。系统要求在1 550 nm、1 064 nm、800 nm和632.8 nm激光波段，全视场范围内波像差RMS不大于0.1（=632.8 nm），且无中心遮拦。通过计算初始结构参数，利用Zemax软件优化，采用4片反射式非球面进行设计，全系统体积约为9010060 mm3，波像差最大为0.095，满足系统尺寸和像质要求，整个系统光能透过率约为92%，满足透过率大于85%的设计要求。

Optical design of wide field laser beam expander with reflection method

 Laser beam expander is used to compress the laser divergence angle, in order to reduce the energy losing in long distance scanning acquisition system. To meet the requirements of the laser communication experiment, a laser beam expander system was designed. The system has 10 times magnification and 48°× 40° working field, which is used in 1 550 nm, 1 064 nm, 800 nm and 632.8 nm laser wavebands(632.8 nm waveband is mainly used for system test). After the calculation of primary structrue parameters and the optimization by Zemax, four conic mirrors were used to compose the system. Considering the tolerence, the system-s maxium wavefront aberration(WFE) is 0.095λ(λ=632.8 nm) that satisfies the requirement of the RMS of WFE ＜0.1λ. It has a total size of 90×100×60 mm3 and transmission of about 92%，which also meets the 85% transmission demand.