Optical design and fabrication of an all-aluminum unobscured two-mirror freeform imaging telescope

Freeform optics offers more degrees of freedom to optical design that can benefit from a compact package size and a large field of view for imaging systems. Motivated by the advances in modern optical fabrication and metrology, freeform optics has been found in many applications. In this paper, we w...

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Bibliographic Details
Published in:Applied optics (2004) 2020-01, Vol.59 (3), p.833
Main Authors: Xie, Yongjun, Mao, Xianglong, Li, Jinpeng, Wang, Fengbiao, Wang, Peng, Gao, Rong, Li, Xing, Ren, Shangjie, Xu, Zhichen, Dong, Rongguang
Format: Article
Language:English
Subjects:
Aluminum
Diamonds
Field of view
Imaging
Metrology
Optical design
Optics
Telescopes
Test procedures
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Summary:Freeform optics offers more degrees of freedom to optical design that can benefit from a compact package size and a large field of view for imaging systems. Motivated by the advances in modern optical fabrication and metrology, freeform optics has been found in many applications. In this paper, we will describe the challenging optical design, fabrication, metrology, and assembly of an all-aluminum unobscured two-mirror freeform imaging telescope. The telescope has a large field of view of 20 ×15 . The freeform aluminum mirrors are manufactured by diamond turning based on a feedback modification strategy. The freeform mirrors are measured by a computer-generated hologram-based interferometric null test method. All-aluminum configuration has the advantages of being athermal and cost-effective.
ISSN:1559-128X
2155-3165
DOI:10.1364/AO.379324