光谱学与光谱分析
光譜學與光譜分析
광보학여광보분석
SPECTROSCOPY AND SPECTRAL ANALYSIS
2014年
4期
1124-1129
,共6页
翟珊珊%杨晋%巴音贺希格%崔继承%齐向东%唐玉国
翟珊珊%楊晉%巴音賀希格%崔繼承%齊嚮東%唐玉國
적산산%양진%파음하희격%최계승%제향동%당옥국
杂散光%平面光栅%ASAP软件%仪器杂光%杂散光测试仪%杂光抑制
雜散光%平麵光柵%ASAP軟件%儀器雜光%雜散光測試儀%雜光抑製
잡산광%평면광책%ASAP연건%의기잡광%잡산광측시의%잡광억제
Grating scatter%Plane grating%ASAP software%Instrumentation’s stray light%Stray-light testing equipment%Stray-light suppression
杂散光是平面光栅的重要性能指标,光栅杂散光的测量一直是光栅研制领域的难题。为实现仪器自身杂光低于10-8量级,以满足对平面光栅杂散光10-7量级的精确测量要求,基于标量衍射理论和经典Fresnel-Kirchhoff衍射理论,对光谱仪器中的光栅杂散光进行了理论分析,设计了平行光照射条件下光栅杂散光测试仪的光机模型。利用杂散光分析软件ASAP建立紫外单色光入射下光栅杂散光测试仪的散射模型并对其进行仿真计算,分析仪器杂光的主要来源及散射路径,据此提出了用于降低仪器散射光和光栅多次衍射光的挡光环、叶片、光阑、光学陷阱等四种杂光抑制结构。最后,采用ASAP软件对增加抑制结构前后的仪器杂光相对强度进行了对照分析。仿真及分析结果表明,仪器杂光在测试波长±100 nm范围内的最大值由采用杂光抑制结构前的10-6量级以上降低至10-8量级以下,已满足光栅杂散光测试仪的设计需求,即可实现刻线密度为300~3600 gr · mm-1的光栅杂散光10-7量级精确测量。该研究方法及结果将为平面光栅杂散光测试仪研制提供理论依据。
雜散光是平麵光柵的重要性能指標,光柵雜散光的測量一直是光柵研製領域的難題。為實現儀器自身雜光低于10-8量級,以滿足對平麵光柵雜散光10-7量級的精確測量要求,基于標量衍射理論和經典Fresnel-Kirchhoff衍射理論,對光譜儀器中的光柵雜散光進行瞭理論分析,設計瞭平行光照射條件下光柵雜散光測試儀的光機模型。利用雜散光分析軟件ASAP建立紫外單色光入射下光柵雜散光測試儀的散射模型併對其進行倣真計算,分析儀器雜光的主要來源及散射路徑,據此提齣瞭用于降低儀器散射光和光柵多次衍射光的擋光環、葉片、光闌、光學陷阱等四種雜光抑製結構。最後,採用ASAP軟件對增加抑製結構前後的儀器雜光相對彊度進行瞭對照分析。倣真及分析結果錶明,儀器雜光在測試波長±100 nm範圍內的最大值由採用雜光抑製結構前的10-6量級以上降低至10-8量級以下,已滿足光柵雜散光測試儀的設計需求,即可實現刻線密度為300~3600 gr · mm-1的光柵雜散光10-7量級精確測量。該研究方法及結果將為平麵光柵雜散光測試儀研製提供理論依據。
잡산광시평면광책적중요성능지표,광책잡산광적측량일직시광책연제영역적난제。위실현의기자신잡광저우10-8량급,이만족대평면광책잡산광10-7량급적정학측량요구,기우표량연사이론화경전Fresnel-Kirchhoff연사이론,대광보의기중적광책잡산광진행료이론분석,설계료평행광조사조건하광책잡산광측시의적광궤모형。이용잡산광분석연건ASAP건립자외단색광입사하광책잡산광측시의적산사모형병대기진행방진계산,분석의기잡광적주요래원급산사로경,거차제출료용우강저의기산사광화광책다차연사광적당광배、협편、광란、광학함정등사충잡광억제결구。최후,채용ASAP연건대증가억제결구전후적의기잡광상대강도진행료대조분석。방진급분석결과표명,의기잡광재측시파장±100 nm범위내적최대치유채용잡광억제결구전적10-6량급이상강저지10-8량급이하,이만족광책잡산광측시의적설계수구,즉가실현각선밀도위300~3600 gr · mm-1적광책잡산광10-7량급정학측량。해연구방법급결과장위평면광책잡산광측시의연제제공이론의거。
Grating scatter is an important performance index for plane grating ,and its measurement is a difficult problem for grating research field .In order to achieve stray-light of the instrument itself to be less than 10-8 so that the grating scatter can be accurately measured ,stray light in diffraction grating monochromators has been studied and an opto-mechanical model of meas-ure instrument for plane grating is designed ,which works in parallel light environment and based on the scalar diffraction theory and classical Fresnel-Kirchhoff diffraction theory .Main pathway of the instrumentation’s stray light is calculated and analyzed by the simulation of stray-light testing equipment with ASAP software .Accordingly ,four stray-light suppression structures in-cluding blocking rings ,vanes ,aperture stops and light traps are proposed to reduce instrument’s scattered light and grating’s multiple diffraction .Finally ,contrast analysis of the instrumentation’s stray light is made before and after adding stray-light suppression structures .Simulation and analysis results show that the max of instrument’s stray light reduces from more than 10-6 to less than 10-8 after adding stray-light suppression structures and has met the stray-light testing equipment’s design re-quirements whose goal is to realize accurate measurement greater than or equal to 10-7 for grating scatter with grating’s groove density changing from 300 to 3 600 gr · mm -1 .The research methods and results above will provide a theoretical basis for the research and development of the stray-light testing equipment for plane grating .