复合式无遮拦激光扩束器的设计  

Design of a composite laser beam expander without obscuration

作　　者：卢政伟 邵帅[1] 马亚坤[1] LU Zheng-wei;SHAO Shuai;MA Ya-kun(Changchun Institute of Optics,Fine Mechanics and physics,Chinese Academy of sciences,Changchun 130033,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100049

出　　处：《中国光学》2018年第4期582-589,共8页Chinese Optics

基　　金：中科院三期创新资助项目(No.09J52SCN90)~~

摘　　要：为满足大功率激光发射的要求,提出研制一种基于卡塞格林系统的大口径激光发射的复合式无遮拦激光扩束器,消除卡塞格林系统中心遮拦,提高激光发射效率。依据卡塞格林系统原理及其结构特征,结合伽利略折射式扩束器的特点,设计一种发射口径为550 mm的复合式无遮拦激光扩束器,采用反射式扩束器和折射式扩束器结合的方式,在卡塞格林次镜中心开通孔,使中心被遮拦激光透过。后接伽利略式折射扩束器,对中心透过光束进行扩束,两光束共轴发射。对设计的新型复合扩束器进行激光透过率实验,实验结果表明,对于波长10.6μm激光,透过率大于95.21%,比传统卡塞格林扩束器提高22.12%。In order to meet the requirements of high-power laser emission,a large-diameter composite laser beam expander without central obscuration based on Cassegrain system is proposed to eliminate the central obscuration of the Cassegrain system and improve the laser emission efficiency. Based on the principle of the Cassegrain system and its structural characteristics,combined with the characteristics of the Galileo refraction type beam expander,a composite laser beam expander without central obscuration with an emission aperture of550 mm is designed. Using a combination of a reflective beam expander and a refractive beam expander,a through hole is opened in the center of the Cassegrain secondary mirror so that the center is passed through the obscured laser. The rear side is connected to a Galileo-type refracting beam expander,which expands the beam transmitted through the center,and the two beams are emitted coaxially. The laser transmittance test iscarried out on a new type of composite beam expander. The experimental results show that for the laser of 10. 6μm wavelength,the transmittance is more than 95. 21%,which is 22. 12% higher than that of the traditional Cassegrain beam expander.

关 键 词：发射效率 扩束器 卡塞格林 

分 类 号：TN243[电子电信—物理电子学] TH703[机械工程—仪器科学与技术]