The Evaluation of Spectral Resolution in the Optical Design of a Czerny-Turner Spectrometer

Authors：Shi, Wenjie; Gao, Lin; Zhang, Long; Feng, Zhiwei; Fang, Fan; Xia, Guo^*

Source：Photonics, 2022, 9(10): 678.

DOI：10.3390/photonics9100678

• optical transfer function
• spectral resolution
• optical design
• Czerny-Turner spectrometer

In this study, we propose a method of evaluating the spectral resolution of crossed-asymmetric Czerny-Turner spectrometers by comparing the impact of different slit functions on the optical transfer function, and different slit widths, through simulation and experiments. The results show that, the Gaussian function is suitable for narrower slit widths, such as 25 mu m, and the rectangle function or convolution of slit-scattering function with rectangle function is suitable for wider slit widths, such as 50 mu m, 150 mu m, and 200 mu m. The proposed method can provide guidance in the evaluation of spectral resolution in the preliminary optical design process of spectrometers.