高功率半导体激光器光束整形的设计和实现

Design and implementation of beam shaping for high power semiconductor lasers

为了使线阵半导体激光器光束能更好应用于激光远程无线电力传输,设计了基于光楔-曲面镜-棱镜组的线阵半导体激光束整形系统,采用数值计算方法,取得了系统中各元件的参量及理论整形效果。在此基础上加工出实物元件,搭建整形系统。实验中测得整形后的激光光斑尺寸为9.9cm×9.6cm,能量均匀度为68.9%,系统能量传输效率为71.3%,光束质量可满足接收端的光电池对激光空间均匀性的要求。最后分析了仿真系统与实验系统间产生差异的原因。结果表明,该系统可同时实现激光束阵列快轴和慢轴方向的扩束与准直,并能够调节输出光斑的形状及光强均匀度,且采用光学元件数量较少。光电池组件是激光无线电力传输过程的关键元件,该设计对激光转换效率的研究有较重要的实用价值。

In order to make the laser beam of linear-array semiconductor laser be better used in laser remote wireless power transmission,a linear-array semiconductor laser beam shaping system based on the set of optical wedges,curved mirrors and prisms was designed. The parameters of components in the system and the theoretical shaping results were derived by numerical calculation. After then the realistic components were processed and the experimental shaping system was built. The experimental results were that the laser spot size after shaping was 9. 9cm × 9. 6cm,energy uniformity was 68. 9%,and energy transfer efficiency was 71. 3%. The beam quality could meet the requirement of light cell at receiving end for laser space uniformity. The reason of the difference between the simulated and experimental system was analyzed. The results show that the system can simultaneously realize the expanding and collimation of laser beam array along fast axis and slow axis. The system can also adjust the shape and the uniformity of output light spot with less optical components. Light cell components are the key processes of laser wireless power transmission. The study has great practical value for laser conversion efficiency.