非相干叠加激光发射系统光学设计  

Optical design of incoherent combining laser beam expander

作　　者：赵知诚[1,2] 沈为民[1,2] 唐敏学[1,2] 贺虎成[1,2] 

机构地区：[1]苏州大学物理与光电.能源学部教育部现代光学技术重点实验室,江苏苏州215006 [2]苏州大学物理与光电.能源学部江苏省先进光学制造技术重点实验室,江苏苏州215006

出　　处：《红外与激光工程》2014年第6期1728-1734,共7页Infrared and Laser Engineering

基　　金：国家自然科学基金(61078043)

摘　　要：介绍了一种适用于三束激光非相干叠加聚焦的新型激光发射光学系统,工作波长1080nm,全视场角0.6°。系统为离轴两镜反射结构,对三束紧密排列的激光光束进行扩束聚焦,系统主镜为口径303mm的椭球面反射镜,系统像质接近衍射极限,并且可以通过控制次镜轴向位置调焦适应不同目标距离。计算了叠加后的激光光斑的功率密度分布和环围功率曲线,设计在目标距离1000m时叠加光斑半径9 mm内的环围功率大于95%,此激光发射系统结构简单,长径比小,聚焦质量满足使用需求,激光光斑能量得到有效叠加。A new optical design of laser beam expander is introduced. It suits for three laser beams to be expanded and focused. Its operation wavelength is 1 080 nm and its full field of view 0.6 degrees. A two- mirror catoptrical telescope is designed for expanding and focusing three beams which are arranged in a close configuration. Its primary is an ellipsoid mirror with aperture diameter of 303 mm. Its focusing performance approaches to the diffraction limitation. And focusing at different target ranges is implemented through control of the axial position of the secondary mirror. The power density distribution and power in the bucket curve of combined and focused laser spots are calculated with the aid of computer simulation. When focused at one kilometer, the ratio of the spot power in the bucket of 9 mm radius to the total power is over 95 percent. This new kind beam expander has the advantages of simple and low length-to-aperture-diameter ratio. The system focusing performance satisfied the usage requirement. The power of laser spots is effectively combined.

关 键 词：激光发射光学系统 非相干叠加 两镜反射系统 非球面反射镜 

分 类 号：TH744[机械工程—光学工程]