A first step beam expander for high power laser was designed and developed.The work includes the decision of optical system′s type and structure,the choice of the mirror material,etc.The designed abaxial beam expander is a Gassegrain system.Based on the analysis of the high power laser and mirror materials,a kind of copper was chosen to make the mirror.The mirror has very small thermal distortion and thus the beam quality is guaranteed.Qualitative and quantitative test was made.The RMS of the wave phase difference on the optics elements is 0.538 λ(λ=0.6328 μm).The system is of good performance and can be used as high power laser beam expander.
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邵帅,高云国,郭劲.高功率激光发射系统的一级扩束设计[J].激光与红外,2010,40(7):744~747 SHAO Shuai, GAO Yun-guo, GUO Jin. Design of the first step beam expander for the high power laser[J]. LASER & INFRARED,2010,40(7):744~747