Optical design of diffractive telescope system based on off-axis three mirror

Chuanwang He; Peng Huang; Xiaochun Dong; Bin Fan

doi:10.1117/12.2505811

11 January 2019 Optical design of diffractive telescope system based on off-axis three mirror

Chuanwang He, Peng Huang, Xiaochun Dong, Bin Fan

Proceedings Volume 10837, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 108370K (2019) https://doi.org/10.1117/12.2505811
Event: Ninth International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT2018), 2018, Chengdu, China

Abstract

Diffractive telescope has the advantages of lightweight and loose tolerance, so it can become the next generation space telescope. In order to realize no central obscuration, compact structure and large field of view (FOV), the off-axis three mirror is used as eyepiece in diffractive telescope system. According to the Schupmann’s achromatic theory, an optical design example of diffractive telescope with 0.8m aperture of objective lens, 0.46~0.54μm spectral bandwidth and 0.08° FOV is presented. By using the function of coordinate break in optical design software ZEMAX, an unobscured diffractive telescope system based on off-axis three mirror eyepiece is realized. After optimized original structure parameters, the diffractive telescope system has a good performance with 39.1m short total length. Here, at the spatial frequency of 50lp/mm, the values of modulation transfer function (MTF) within full FOV are greater than 0.574. Furthermore, the values of RMS radius are less than airy radius diameter. The optimized results clearly show that the system is achromatic and near diffraction limited imaging quality.

Citation Download Citation

Chuanwang He, Peng Huang, Xiaochun Dong, and Bin Fan "Optical design of diffractive telescope system based on off-axis three mirror", Proc. SPIE 10837, 9th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 108370K (11 January 2019); https://doi.org/10.1117/12.2505811

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