曲率半径误差对平场全息凹面光栅分辨率的影响及其补偿方法  

Effect of Curvature Radius Error on the Flat-Field Holographic Concave Grating Resolution and Its Compensation

作　　者：孔鹏[1,2] 巴音贺希格[1] 李文昊[1] 唐玉国[1] 崔锦江[3] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院研究生院,北京100049 [3]中国科学院苏州生物医学工程技术研究所,江苏苏州215163

出　　处：《光谱学与光谱分析》2011年第5期1435-1438,共4页Spectroscopy and Spectral Analysis

基　　金：国家自然科学基金项目(60478034);"十一五"国家科技支撑计划重大项目(2006BAK03A02);吉林省科技发展计划项目(20070523;20086013)资助

摘　　要：在平场凹面全息光栅的设计制作中,不可避免的存在曲率半径误差,严重影响光栅光谱仪的分辨率。为了从理论上分析并指导光谱仪器的设计和装调,运用几何光线追迹方法计算并分析了不同曲率半径误差下光谱像宽度的变化规律,发现在一个较大的误差范围内子午焦线的位置随着曲率半径的变化前后平移,同时其弯曲程度几乎没有改变。数值计算发现通过调整像面位置或入臂长度均能够补偿曲率半径的误差。数值模拟结果显示,修正使用结构后的光栅能够达到与设计结果相近的成像质量。The spectral resolution of the spectrometer will be seriously deteriorated by radius error which is inevitable in the flat-field holographic concave grating fabrication.In order to give theoretical guidance to the design and assembly of the spectrometers,the geometric ray-tracing method was used to calculate and analyze the variation of the spectral image width with different radius error.It was discovered that in a wide range of the radius error,the position of the tangential focal curve moves forward or backward as the radius changes,while the shape of the tangential focal curve remains almost unchanged.As is shown through the calculation,the radius error can be compensated by adjustment of the detector＇s position or entrance slit distance.The simulation results indicate that with proper modification of the using structure,the grating can have a spectral resolution as good as the designed results.

关 键 词：光谱仪 衍射光栅 全息 平场 光栅制作 

分 类 号：O433.4[机械工程—光学工程]