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1、第38卷第5期红外与激光工程2009年10月Vol.38No.5InfraredandLaserEngineeringOct.2009一种大相对孔径成像光谱仪前置物镜设计宫广彪,季轶群,朱善兵,张蕊蕊,沈为民(苏州大学现代光学技术研究所,江苏苏州215006)摘要:Offner型成像光谱仪具有结构紧凑,成像质量理想的优点,为了提高光谱分辨率,实现更多谱段的光谱成像,需要分光成像系统有强的集光能力,即需要大的相对孔径;为了消除折射材料的影响,提高光栅利用效率,系统应该全反射无遮拦,为此选用离轴三反射镜系统作为它的前置物镜。离轴三反射镜光学系统具有无色
2、差、光谱范围宽、无遮拦、像差矫正能力强和对温度不敏感等优点,可作为成像光谱仪的理想前置系统。根据该成像仪的技术要求,得到系统F数为F/2.47,焦距为360mm,视场角为2.5°。通过优化设计,得到了一个大相对孔径的离轴三反射镜前置物镜系统。该系统相对孔径大,光能利用率高,成像质量达到衍射极限,特别是次镜采用球面,大大降低了制造检测难度和成本。关键词:前置物镜;离轴三反射镜;大相对孔径;成像光谱仪;光学设计中图分类号:O435文献标识码:A文章编号:1007-2276(2009)05-0889-04Designofafore蛳opticalobje
3、ctivewithlargerelativeapertureforspectralimagersGONGGuang蛳biao,JIYi蛳qun,ZHUShan蛳bing,ZHANGRui蛳rui,SHENWei蛳min(ModernOpticalTechnologyInstitute,SoochowUniversity,Suzhou215006,China)Abstract:Offnerspectralimagerhastheadvantagesofcompactnessandidealimagingquality.Inordertoimprove
4、itsspectralresolution,acquiremorespectralbandimages,itsspectroscopicimagingsystemsmusthavehighcollectivity,i.e.largerelativeaperture.Besides,forpurposeofeliminatingtheinfluenceofrefractivematerialandenhancingtheuseefficiencyofgrating,purereflectivesystemswithoutobstructionares
5、uitablechoice.Andanoff蛳axisthree蛳mirrorsystemwasusedasthefore蛳opticalobjective.Ithastheadvantagesofachromatism,widespectralrange,non蛳obstruction,excellentaberrationcorrectionabilityandimmunitytoitsenvironmentaltemperature.Itcanideallybetakenasthefore蛳opticalobjectiveofspectral
6、imagers.Accordingtothespecificationofourdesignedspectralimager,theF蛳number,thefocallength,andthefieldofviewoftheobjectiveshouldreachF/2.47,360mm,and2.5°,respectively.Throughoptimizationdesign,asystemwithlargerelativeapertureandoff蛳axisthree蛳mirrorfore蛳opticalobjectivewasobtain
7、ed.Itsadvantagesincludelargerelativeaperture,highlightutilization,diffraction蛳limitedimagingperformance,andespeciallyitsconvexsphericalsecondarymirrormakesitsmanufactureandtestdifficultyandcostbesubstantiallyreduced.Keywords:Fore蛳opticalobjective;Off蛳axisthree蛳mirror;Largerela
8、tiveaperture;Spectralimager;Opticaldesign收稿日期:2008-12-10;修订日期