文章编号：1002-2082(2023)05-1118-07OPO激光测距机发射端变倍扩束系统设计蔡震，吉俊文（江苏亮点光电科技有限公司，江苏苏州215100）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（opticalparametricoscillation）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6mrad，出射光束直径为ϕ7mm，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285mm，结构简单，利于工程化。关键词：光学设计；OPO激光器；扩束；无焦变倍；人眼安全中图分类号：TN249;O439文献标志码：ADOI：10.5768/JAO202344.0507003Designofzoombeam-expansionsystemforOPOlaserrangefindertransmitterCAIZhen，JIJunwen（JiangsuLumispotTechnologyCo.,Ltd.,Suzhou215100,China）Abstract：AzoombeamexpansionsystemforOPO(opticalparametricoscillation)laserrangefindertransmitterwasdesigned.Thesystemadoptedtwo-stagelaserbeamexpansion,whichcompressedthedivergenceangleofOPOlaserbeamforthetwice.Theprimarylaserbeamexpansionwasvariablemagnificationbeamexpansion,andthesecondarylaserbeamexpansionwasconstantmagnificationbeamexpansion,sothatthedivergenceangleoftheoutputbeamcouldbecontinuouslyadjustedtorealizethewiderangerangingofthelaserrangefinderandimprovethehuman-eyesafetyinthelaserrangingprocess.ThedivergenceangleoftheoutputbeamofOPOlaseris6mrad,thediameteroftheoutputbeamisϕ7mm,andthebeamexpansionrateis6to12times,amongwhichthevariablemagnificationbeamexpansionrateoftheprimarylaseris2to4times,andthebeamexpansionrateofthesecondarylaseris3times.Thedesignedopticalsystemmeetstherequirementsoflarge-aperturebeamincidence,andhasthefunctionofvariablemagnificationbeamexpansion,whichbreakthroughthelimitationthattheexistingvariablemagnificationbeamexpansionsystemcanonlyachievesmall-aperturebeamincidence.Thetotallengthofthefi...
