Zhou Qian, Pang Jinchao, Li Xinghui, Ni Kai, Tian Rui
Appl Opt. 2015 Nov 10;54(32):9450-5. doi: 10.1364/AO.54.009450.
In this study, a new flat-field concave grating miniature spectrometer is proposed with improved resolution across a wide spectral band. A mirror is added to a conventional concave grating spectrometer and placed near the existing detector array, allowing a wide spectral band to be divided into two adjacent subspectral bands. One of these bands is directly detected by the detector, and the other is indirectly analyzed by the same detector after being reflected by the mirror. These two subspectral bands share the same entrance slit, concave grating, and detector, which allows for a compact size, while maintaining an improved spectral resolution across the entire spectral band. The positions of the mirror and other parameters of the spectrometer are designed by a computer procedure and the optical design software ZEMAX. Simulation results show that the resolution of this kind of flat-field concave grating miniature spectrometer is better than 1.6 nm across a spectral band of 700 nm. Experiments based on three laser sources reveal that the measured resolutions are comparable to the simulated ones, with a maximum relative error between them of less than 19%.
在本研究中，提出了一种新型的平场凹面光栅微型光谱仪，其在宽光谱带上具有更高的分辨率。在传统的凹面光栅光谱仪中增加了一面镜子，并将其放置在现有探测器阵列附近，使得宽光谱带被分成两个相邻的子光谱带。其中一个子光谱带由探测器直接检测，另一个子光谱带在被镜子反射后由同一探测器间接分析。这两个子光谱带共享相同的入射狭缝、凹面光栅和探测器，这使得光谱仪尺寸紧凑，同时在整个光谱带上保持了更高的光谱分辨率。镜子的位置和光谱仪的其他参数通过计算机程序和光学设计软件ZEMAX进行设计。模拟结果表明，这种平场凹面光栅微型光谱仪在700nm光谱带上的分辨率优于1.6nm。基于三个激光源的实验表明，测量分辨率与模拟分辨率相当，两者之间的最大相对误差小于19%。
