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): 1218001-1218001(7). doi: 10.3788/IRLA201847.1218001
Citation:
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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): 1218001-1218001(7). doi: 10.3788/IRLA201847.1218001
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Optical design of miniaturized and large field of view off-axis optical system based on freeform surface
- 1.
Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,China
- Received Date: 2018-07-17
- Rev Recd Date:
2018-08-19
- Publish Date:
2018-12-25
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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 3.60.45, 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 (=632.8 nm), RMS wave-front error value is 0.034 , 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.
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Proportional views
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