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Astigmatism-free Czerny-Turner spectrometer with a low f-number by a bicylinder lens

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APPLIED OPTICS
卷 61, 期 27, 页码 7985-7990

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Optica Publishing Group
DOI: 10.1364/AO.470322

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  1. National Key Research and Development Program of China [2017YFE0301205]

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This article introduces a modified optical design for a broadband astigmatism-corrected Czerny-Turner spectrometer, and demonstrates its superior performance compared to traditional spectrometers through detailed comparisons.
A modified optical design for a broadband astigmatism-corrected Czerny-Turner spectrometer with high resolution and large throughput is presented. The theory of astigmatism correction is analyzed with the use of a bicylinder lens with different radii of curvature in tangential and sagittal planes. The optical performances of a modified spectrometer and two traditional spectrometers are compared in detail. The results show that the modified Czerny-Turner spectrometer can obtain superior astigmatism-free performance, an f-number of 2.5, and spectral resolution of 1.5 nm in 350-750 nm. Its volume decreases by approximately 77% compared with a traditional spectrometer with the same f-number. (C) 2022 Optica Publishing Group

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