OPO激光测距机发射端变倍扩束系统设计  

Design of zoom beam-expansion system for OPO laser rangefinder transmitter

作　　者：蔡震 吉俊文 CAI Zhen;JI Junwen(Jiangsu Lumispot Technology Co.,Ltd.,Suzhou 215100,China)

机构地区：[1]江苏亮点光电科技有限公司,江苏苏州215100

出　　处：《应用光学》2023年第5期1118-1124,共7页Journal of Applied Optics

基　　金：十三五某目标综合电子防护系统——高精度激光探测设备项目。

摘　　要：设计了一种OPO激光测距机发射端变倍扩束系统。该系统采用两级激光扩束,将OPO(optical parametric oscillation)激光器出射光束发散角二次压缩,一级激光扩束为变倍扩束,二级激光扩束为定倍扩束,使出射光束发散角可连续调节,以实现激光测距机大范围测距,提高了激光测距过程的人眼安全性。OPO激光器出射光束发散角为6 mrad,出射光束直径为ϕ7 mm,扩束倍率6~12倍,其中,一级激光变倍扩束倍率为2~4倍,二级激光扩束倍率为3倍。设计的光学系统满足较大口径光束入射,且具有变倍扩束功能,突破了现有变倍扩束系统仅能实现小口径光束入射的限制。最终设计的变倍扩束系统总长度为285 mm,结构简单,利于工程化。A zoom beam expansion system for OPO(optical parametric oscillation)laser rangefinder transmitter was designed.The system adopted two-stage laser beam expansion,which compressed the divergence angle of OPO laser beam for the twice.The primary laser beam expansion was variable magnification beam expansion,and the secondary laser beam expansion was constant magnification beam expansion,so that the divergence angle of the output beam could be continuously adjusted to realize the wide range ranging of the laser rangefinder and improve the human-eye safety in the laser ranging process.The divergence angle of the output beam of OPO laser is 6 mrad,the diameter of the output beam isϕ7 mm,and the beam expansion rate is 6 to 12 times,among which the variable magnification beam expansion rate of the primary laser is 2 to 4 times,and the beam expansion rate of the secondary laser is 3 times.The designed optical system meets the requirements of large-aperture beam incidence,and has the function of variable magnification beam expansion,which break through the limitation that the existing variable magnification beam expansion system can only achieve small-aperture beam incidence.The total length of the finally designed optical system is 285 mm,which is simple in structure and conducive to engineering.

关 键 词：光学设计 OPO激光器 扩束 无焦变倍 人眼安全 

分 类 号：TN249[电子电信—物理电子学] O439[机械工程—光学工程]