Astigmatism-free Czerny-Turner compact spectrometer with cylindrical mirrors

A modified optical design for a broadband, high resolution, astigmatism-free Czerny-Turner spectrometer is proposed. Astigmatism is corrected by using cylindrical mirrors over a broad spectral range. The theory and method for astigmatism correction are thoroughly analyzed. The comparison between the modified Czerny-Turner spectrometer and the traditional Czerny-Turner spectrometer is also described in detail. The ray-tracing results show that the RMS spot radius has decreased to 4.2 mu m at the central wavelength and 17 mu m at the wedge wavelength. (C) 2017 Optical Society of America