共轴PGP型光谱仪的玻璃选择与优化

针对棱镜-光栅-棱镜(PGP)型成像光谱仪装调难度大的问题,通过校正PGP成像光谱仪色差的方法保证探测器像面与光轴垂直,并设计了一款宽波段复消色差的PGP系统。从宽波段复消色差理论出发,计算了三种玻璃材料组合理论色差的最小值,为光学设计的复消色差提供了理论支持。利用光学设计软件优化得到的初始结构,结果表明,PGP系统的二级光谱得到了很好的校正,且探测器的CCD无需倾斜,更方便后期装调。覆盖谱宽为400~1000 nm,视场为9.2 mm,空间分辨率优于10μm,光谱分辨率优于2.8 nm,光学传递函数大于0.7,接近衍射极限,满足成像要求。

Glass Selection and Optimization of Coaxial PGP Spectrometer

Aiming at the problem of difficult adjustment of prism-grating-prism(PGP)imaging spectrometer,the method of correcting the chromatic aberration of PGP imaging spectrometer is used to ensure that the detector image plane is perpendicular to the optical axis,and a wide-band achromatic PGP system is designed in this paper.Starting from the wide-band apochromatic theory,the minimum theoretical chromatic aberration of the three glass material combinations is calculated,which provides theoretical support for the apochromatic optical design.Using the optical design software to optimize the initial structure,the results show that the secondary spectrum of the PGP system has been well corrected,and the CCD of the detector does not need to be tilted,which is more convenient for later installation and adjustment.The coverage spectrum width is 400--1000 nm,the field of view is 9.2 mm,the spatial resolution is better than 10μm,the spectral resolution is better than 2.8 nm,and the optical transfer function is greater than 0.7,which is close to the diffraction limit,meeting imaging requirements.