Optics and Photonics Society of Iran

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Our aim in this paper is to design an optimal multispectral telescope with the lowest possible aberration and volume and the highest image quality in the near-visible and infrared wavelength region (VNIR) with a field of view of 0-3 degrees in the wavelength range of 0.48-0.82 micrometers. The new design and simulation is a compact multispectral telescope with the Cassegrain telescope and a concave elliptical grating with low volume and lightweight with a simple structure. This new design is without the need for a field-sharpening lens and has better image quality than other multispectral telescope designs reported so far. For this purpose, the Schmidt Cassegrain Telescope was first designed. The transitional elliptical concave grating can reduce the number of optical components. This simulated multispectral telescope can receive images and obtain spectral information. Modulation transfer function diagrams (MTFs) are reported to check image quality, point diagrams to show spectral separation, and field curvature diagrams to report system aberration. The results show that spectral resolution with excellent image quality is achieved with the least possible aberration.

Keywords: Compact multispectral telescope, Elliptical Concave grating, MTF, Field curvature, Aberration

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