Development of wide-angle three-mirror system with spiral optical axis

Takayuki Nakano; Yoshihiro Matsumoto; Yasuhisa Tamagawa

doi:10.1117/12.869500

8 September 2010 Development of wide-angle three-mirror system with spiral optical axis

Takayuki Nakano, Yoshihiro Matsumoto, Yasuhisa Tamagawa

Proceedings Volume 7652, International Optical Design Conference 2010; 76520O (2010) https://doi.org/10.1117/12.869500
Event: International Optical Design Conference 2010, 2010, Jackson Hole, WY, United States

Abstract

A design method of wide-angle three-mirror system with spiral optical axis is proposed. Asymmetric optical systems have more degrees of freedom than co-axial systems. The increased degrees of freedom can be applied for removal of ray obscuration by mirrors to achieve wide-angle and low F-number system design. The asymmetric system design requires three-dimensional comprehension of system structure and correction of asymmetric aberrations. In order to simplify the structure comprehension, a base sphere is introduced. The system structure can be changed into the two-dimensional structure of mirror interferences by the base sphere. The dominant asymmetric aberrations are spherical-like and astigmatism-like aberrations. The spherical-like aberration is eliminated by each mirror inidividualy and the astigmatism-like aberration is reduced by counterbalance of whole mirrors. An example of F/2 system with as wide angle as 30x24 degrees FOV is designed. The example system is fabricated by precision machining process for an infrared camera.

Citation Download Citation

Takayuki Nakano, Yoshihiro Matsumoto, and Yasuhisa Tamagawa "Development of wide-angle three-mirror system with spiral optical axis", Proc. SPIE 7652, International Optical Design Conference 2010, 76520O (8 September 2010); https://doi.org/10.1117/12.869500

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