宽谱段消像散Czerny-Turner光谱仪光学系统设计

针对光谱仪小型化、高分辨率的发展趋势，设计了一种结构简单、宽谱段、消像散的小型光谱仪。具体分析了折叠光路Czerny-Turner光谱仪各种像差的原理和校正方法。推导了柱透镜宽谱段消像散的理论方程。作为实例，设计了一款谱段为300～900nm、物方数值孔径0.08的小型光谱仪。该光谱仪采用折叠光路结构以减小尺寸，添加柱透镜以消除整个谱段的像散。结果表明:该光谱仪结构简单紧凑，体积小，实现了宽谱段的消像散，全谱段光谱分辨率优于0.5nm。

Optical system design of broadband astigmatism-free czerny-turner spectrometer

For the development trend of miniaturization and high-resolution of spectrometer, an optical design with a simple structure, broadband, astigmatism-corrected micro spectrometer was designed. The principle and correction method of the aberration of crossed beam czerny-turner spectrometer were analyzed in detail. The broadband astigmatism-corrected theory equations using cylindrical lens were deduced. For example, a micro spectrometer operating in 300-900 nm with an object NA of 0.08 has been designed. This spectrometer adopted crossed beam structure to minish its volume and used a cylindrical lens to remove astigmatism over the full bandwidth. The analyzed results demonstrated that this spectrometer with compact configuration and small volume corrected the astigmatism in the wide spectral region. The resolution of the spectrometer was better than 0.5 nm in the whole spectral region.