Optical Design and Engineering

Null testing of nonrotational symmetry transmission optical freeform: design, modeling, and inspection on the basis of Fermat principles

[+] Author Affiliations
Gufeng Qiu

Soochow University, Institute of Modern Optics, No. 1, Shizi Street, Suzhou, Jiangsu 215006, China

Research Center of Laser Fusion, Science and Technology on Plasma Physics Laboratory, CAEP, No. 64, Mianshan Road, Mianyang, Sichuan 621900, China

Xudong Cui

Research Center of Laser Fusion, Science and Technology on Plasma Physics Laboratory, CAEP, No. 64, Mianshan Road, Mianyang, Sichuan 621900, China

Opt. Eng. 54(11), 115112 (Nov 24, 2015). doi:10.1117/1.OE.54.11.115112
History: Received September 16, 2015; Accepted October 27, 2015
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Abstract.  We present a general design method for a type of transmission freeforms without rotational symmetry and achieve the null testing by putting a well-designed Fermat reflector on the transmitting optical path. The design principle of the reflector is given, and an eccentric spherical surface with 1-mm deviation is used as an example of testing freeform. We fabricated the reflector and the freeform with the single-point diamond turning machine. Both conventional interference inspection and our approach give consistent results. The design error is less than 106mm, and the measurement accuracy is nearly completely determined by the fabrication precision. This approach can also be applied to the inspections of reflecting freeforms with low costs.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Gufeng Qiu and Xudong Cui
"Null testing of nonrotational symmetry transmission optical freeform: design, modeling, and inspection on the basis of Fermat principles", Opt. Eng. 54(11), 115112 (Nov 24, 2015). ; http://dx.doi.org/10.1117/1.OE.54.11.115112


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