Abstract

A novel concentric spectrometer having one convex grating and one concave mirror, working at ${+}{1}$st order diffraction, and with a small size, high resolution, and high diffraction efficiency, is proposed. It can simultaneously achieve high resolution and compactness by increasing the grating groove density. A compact spectrometer operating at a wavelength of 740–790 nm with an excellent imaging quality is designed. Its spectral resolution reaches 0.049 nm, and its diffraction efficiency improves by 27% compared to the conventional Offner spectrometer with convex grating working at ${-}{1}$st order diffraction. This is suitable for small, light, and low-cost atmospheric gas monitoring satellites.

© 2020 Optical Society of America

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