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Proceedings Paper

Design of compact off-axis four-mirror anastigmatic system for space communications
Author(s): Fa-cai Zhao; Quan-she Sun; Kun-feng Chen; Xing-bang Zhu; Shao-shui Wang; Guo-quan Wang; Xiang-liang Zheng
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Paper Abstract

The deployment of advanced hyperspectral imaging and other Earth sensing instruments onboard Earth observing satellites is driving the demand for high-data rate communications. Space laser communications technology offers the potential for significantly increasing in data return capability from space to Earth. Compared to the current state of the art radio frequency communications links, lasercom links operate at much higher carrier frequencies. The use of higher carrier frequencies implies a much smaller diffraction loss, which in turn, results in a much higher efficiency in delivering the signal energy. Optical communications meet the required data rates with small, low-mass, and low-power communications packages. The communications optical system assembly typically consists of a front aperture, reflection or refraction type telescope, with or without a solar rejection filter, aft optics, fine-pointing mirrors, and array detectors. Optical system used in space laser communications usually has long focal length, large aperture compared with common optical systems. So the reflective optical system is widely used. An unobstructed four-mirror anastigmatic telescope system was proposed, which was modified based on the theory about geometry optics of common-axis three-mirror systems. Intermediate image was between secondary and tertiary mirror. In order to fold the optical path, four-mirror was designed by adding the plane reflective mirror at intermediate image. The design was analyzed, then a system with effective aperture of 200mm and field of view of 1.0°x1.0° was designed, total length and magnification are 700mm and 20, respectively. The system has advantages of large magnification, relative short physical size and loose manufacturing tolerances.

Paper Details

Date Published: 21 August 2013
PDF: 6 pages
Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 89061J (21 August 2013); doi: 10.1117/12.2033690
Show Author Affiliations
Fa-cai Zhao, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Quan-she Sun, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Kun-feng Chen, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Xing-bang Zhu, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Shao-shui Wang, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Guo-quan Wang, The 41st Research Institute of China Electronics Technology Group Corp. (China)
Xiang-liang Zheng, The 41st Research Institute of China Electronics Technology Group Corp. (China)


Published in SPIE Proceedings Vol. 8906:
International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems
Keith E. Wilson; Jing Ma; Liren Liu; Huilin Jiang; Xizheng Ke, Editor(s)

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