Super-Resolution For A Dispersive Spectrometer Using A Tilted Area Sensor And Spectrally Varying Blur Kernel Interpolation

The grating, lens, and linear sensor determine a spectrometer's wavelength resolution and measurement range. While conventional methods have tried to improve the optical design to obtain a better resolution, they have a limitation caused by the physical property. To improve the resolution, we introduce a super-resolution method from the computer vision field. We propose tilting an area sensor to realize accurate subpixel shifting and recover a high-resolution spectrum using interpolated spectrally varying kernels. We experimentally validate that the proposed method achieved a high spectral resolution of 0.141nm in 400-800nm by just tilting the sensor in the spectrometer. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement