Advanced optical design of Czerny-Turner spectrometer with high flux and low aberration in broadband

An advanced optical design for a low f-number, high resolution, astigmatism-free, and broadband Czerny-Turner spectrometer is proposed. A hemispherical lens is added between the entrance slit and collimating mirror, which can correct astigmatism and increase numerical aperture at the same time. The theory and method for the aberration correction are analyzed in detail. An example of a design with the f-number as 3 working in 350-750 nm has been presented by the optimized theory. The comparison of the improved Czerny-Turner spectrometer with the conventional Czerny-Turner spectrometer is also thoroughly described in the paper. The ray-tracing results show that the RIM spot radius of the improved Czerny-Turner spectrometer decreases from over 200 mu m to less than 18 mu m compared with the traditional Czerny-Turner spectrometer. (C) 2022 Optica Publishing Group

Automated summary

An advanced optical design for a Czerny-Turner spectrometer with low f-number, high resolution, astigmatism-free, and broadband characteristics is proposed in this paper. The addition of a hemispherical lens between the entrance slit and collimating mirror can correct astigmatism and increase numerical aperture simultaneously. The paper analyzes the theory and method for aberration correction in detail and presents an optimized design example. A comprehensive comparison between the improved Czerny-Turner spectrometer and the conventional one is also provided.