双光栅切换微型平场全息凹面光栅光谱仪.pdf

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1、Vo1．33，No．1第33卷第1期光学学报2013年1月ACTA0PTICASINICAJanuary，2013双光栅切换微型平场全息凹面光栅光谱仪孔鹏唐玉国巴音贺希格齐向东李文昊崔锦江／中国科学院长春光学精密机械与物理研究所，吉林长春130033、＼中国科学院苏州生物医学工程技术研究所，江苏苏州215163／摘要基于CCD的微型平场全息凹面光栅光谱仪，以其简单紧凑的结构和快速高效的工作方式在光谱分析领域获得了广泛的应用。但是，由于受限于色散距离，单纯依靠优化光栅像差很难进一步使光谱分辨率获得大幅提高。提出一种双光栅切换微型平场全息凹面光栅光谱仪的设计方法，用两个使用结

2、构相同的光栅代替传统的单光栅设计，给出一个光谱范围为4001000nm光谱仪的具体设计，计算显示光谱分辨率最大可提高为原来的2．5倍。通过对光栅衍射效率的计算分析，说明此方法能够显著改善仪器的通光效率。设计制作了原理样机，进行了装调测试，实验结果与理论计算相吻合。关键词光谱学；光谱仪；衍射光栅；平场；宽光谱；分辨率；通光效率中图分类号0433．4文献标识码Adoi：10．3788／AOS201333．0105001Double．GratingMinitypeFlat-FieldHolographicConcaveGratingSpectrographKongPengTan

3、gYuguoBayanheshigQiXiangdongLiWenhaoCuiJinjiangChangchunInstituteofOptics，FineMechanicsandPhysics，ChineseAcademyofSciences，Changchun，Jilin130033，ChinaSuzhouInstituteofBiomedicalEngineeringandTechnology，ChineseAcademyofSciences，Suzhou，Jianysu215163，ChinaAbstractTheminitypeflat．fieldhologra

4、phicconcavegratingspectrographequippedwithCCDdetectorsarewidelyusedforspectralanalysis．Theyareacceptedforsomeremarkableadvantages，suchascompactstructureandrapidandefficienttestingprocess．However，restrictedbyimagingdistanceofthespectrometer，itisdifficulttoimprovethespectralresolutiongreatl

5、yjustbyoptimizationoftheholographicconcavegrating．Adesignmethodofdouble—gratingminitypeflat—fieldholographicconcavegratingspectrographisproposed．Thesinglegratinginconventionalspectrographisreplacedbytwogratingswhichareequippedwiththesamegeometry．Adoublegratingflat—fieldspectrographwithawa

6、velengthrangefrom400nmto1000nmisdesigned．Thecalculationresultsshowthattheresolutionofthenewlydesignedspectrographcanbealmosttwoandahalftimesasgreatastheconventionalspectrograph．Thelightthroughputefficiencycanalsobegreatlyimproved，whichisdemonstratedbyanalyzingdiffractionefficiencyofthegra

7、ting．Thedouble—gratingminitypeflat—fieldholographicconcavegratingspectrographisdevelopedandadjusted．Theexperimenta1resultsagreewiththetheoretica1calculationsverywel1．Keywordsspectroscopy；spectrometer；diffractiongratings；flat—field；widespectrum；resolution；lightthroug