• Infrared and Laser Engineering
  • Vol. 47, Issue 12, 1218001 (2018)
Zhao Yuchen*, He Xin, Zhang Kai, Liu Qiang, Cui Yongpeng, and Meng Qingyu
Author Affiliations
  • [in Chinese]
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    DOI: 10.3788/irla201847.1218001 Cite this Article
    Zhao Yuchen, He Xin, Zhang Kai, Liu Qiang, Cui Yongpeng, Meng Qingyu. Optical design of miniaturized and large field of view off-axis optical system based on freeform surface[J]. Infrared and Laser Engineering, 2018, 47(12): 1218001 Copy Citation Text show less

    Abstract

    With the increasing development of space technology, space optical system with the characteristics of high-performance, miniaturization has become a new hotspot research in space optical fields. Off-axis three-mirror optical system has the advantage of high quality image, large field of view and high level of lightweight etc., which can better suit the application of miniaturized and low-cost space optical system and has broad application prospects. Based on the Gaussian optics and three-mirror aberration theory, the off-axis three-mirror with freeform surface of tertiary mirror was designed. The focal length was 1 550 mm, field of view was 3.6°×0.45°, relative aperture was 1: 6.2, degrees of freedom and image quality were increased efficiently by the introduction of freeform surface. The design results show that system has a better performance in effective field of view, modulation transfer function value is above 0.43@111 lp/mm, wave-front error maximum value is 0.049 λ(λ=632.8 nm), RMS wave-front error value is 0.034 λ, maximum grid distortion value is 0.9%, and the imaging quality is complete symmetrical about the tangential plane. The total length of the optical system is less than f′/3.1, the height is less than f′/4.1, and is easily implemented because of the relatively loose tolerance about processing and assembling. The obtained results have a certain reference value for miniaturized space optical system.
    Zhao Yuchen, He Xin, Zhang Kai, Liu Qiang, Cui Yongpeng, Meng Qingyu. Optical design of miniaturized and large field of view off-axis optical system based on freeform surface[J]. Infrared and Laser Engineering, 2018, 47(12): 1218001
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