宽场平谱面全息凹面光栅光谱仪的设计  

Design of Wide-Field and Flat-Spectrum Holographic Concave Grating Spectrometer

作　　者：郝爱花 贺锋涛 李立波[2] 李芸[2] 胡炳樑[2] 

机构地区：[1]西安邮电大学电子工程学院,陕西西安710121 [2]中国科学院西安光学精密机械研究所光谱成像技术重点实验室,陕西西安710119

出　　处：《光学学报》2018年第2期385-389,共5页Acta Optica Sinica

基　　金：国家自然科学基金(11327303);中国科学院光谱成像技术重点实验室开放基金(LSIT201604D)

摘　　要：全息凹面光栅光谱仪具有平谱面、小型化、大孔径、高分辨率等优点。首先从信息光学的角度推导了全息凹面光栅的成像公式,在垂直于狭缝和平行于狭缝的平面上系统分析了全息凹面光栅光谱仪的成像性能;在垂直于狭缝的平面上,全息凹面光栅光谱仪具有良好的平谱面性;在平行于狭缝的平面上,全息凹面光栅光谱仪克服了传统平面光栅的谱线弯曲和色畸变,实现了谱线平直成像;此外指出全息凹面光栅光谱仪固有的弧矢场曲对视场扩展的限制。然后根据理论分析结果提出了结构对称消场曲的全息凹面光栅光谱仪的设计思想,利用ZEMAX软件优化设计了像差补偿型全息凹面光栅光谱仪。在保证相对孔径F#=3、光谱分辨率为20nm/mm、空间分辨率小于25μm等技术指标不变的前提下,设计了狭缝长度为0.4mm的传统单球面镜全息凹面光栅光谱仪和狭缝长度为8mm的像差补偿型全息凹面光栅光谱仪。结果表明,改进后的像差补偿型全息凹面光栅光谱仪成功地将视场扩大为单球面镜全息凹面光栅光谱仪的20倍。Holographic concave grating（HCG）spectrometer has many advantages,such as flat-spectrum,miniaturization,large aperture and high resolution.Firstly,the imaging formula of HCG is deduced based on information optics and its imaging characteristics are analyzed in both perpendicular plane to the slit and parallel plane to the slit.In the perpendicular plane,HCG spectrometer has good flat-spectrum;in the parallel plane,HCG spectrometer overcomes the spectral line bending and chromatic distortion of the traditional plane grating and realizes the straight spectral line imaging.In addition,the restriction of the intrinsic sagittal field curvature of HCG spectrometer to the field of view expanding is pointed out.According to the theoretical analysis results,it is proposed that symmetrical structure eliminates field curvature of HCG spectrometer.Then the aberration compensation spectrometer is designed and optimized with the utilization of ZEMAX software.Both traditional single-spherical-mirror HCG spectrometer with 0.4 mm slit length and aberration compensation HCG spectrometer with 8 mm slit length are designed with the same relative aperture F# of 3,spectral resolution of 20 nm/mm and spatial resolution of less than 25μm.The results show that the field of view of the aberration compensation HCG spectrometer is successfully expanded 20 times larger than that of single-spherical-mirror HCG spectrometer.

关 键 词：光谱学 光谱仪 对称设计 全息凹面光栅光谱仪 宽场 平谱面 

分 类 号：O433.1[机械工程—光学工程] O438.1[理学—光学]