Design of compact off-axis four-mirror anastigmatic system for space communications

Fa-cai Zhao; Quan-she Sun; Kun-feng Chen; Xing-bang Zhu; Shao-shui Wang; Guo-quan Wang; Xiang-liang Zheng

doi:10.1117/12.2033690

21 August 2013 Design of compact off-axis four-mirror anastigmatic system for space communications

Fa-cai Zhao, Quan-she Sun, Kun-feng Chen, Xing-bang Zhu, Shao-shui Wang, Guo-quan Wang, Xiang-liang Zheng

Proceedings Volume 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems; 89061J (2013) https://doi.org/10.1117/12.2033690
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

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.

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Fa-cai Zhao, Quan-she Sun, Kun-feng Chen, Xing-bang Zhu, Shao-shui Wang, Guo-quan Wang, and Xiang-liang Zheng "Design of compact off-axis four-mirror anastigmatic system for space communications", Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 89061J (21 August 2013); https://doi.org/10.1117/12.2033690

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KEYWORDS

Mirrors

Space telescopes

Telescopes

Off axis mirrors

Telecommunications

Laser communications

Optical communications

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