24 November 2015 Null testing of nonrotational symmetry transmission optical freeform: design, modeling, and inspection on the basis of Fermat principles
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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 106  mm, 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.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Gufeng Qiu, Gufeng Qiu, Xudong Cui, Xudong Cui, } "Null testing of nonrotational symmetry transmission optical freeform: design, modeling, and inspection on the basis of Fermat principles," Optical Engineering 54(11), 115112 (24 November 2015). https://doi.org/10.1117/1.OE.54.11.115112 . Submission:
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