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6 October 2000 Superlong-radius measurement
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Proceedings Volume 4231, Advanced Optical Manufacturing and Testing Technology 2000; (2000)
Event: International Topical Symposium on Advanced Optical Manufacturing and Testing Technology, 2000, Chengdu, China
Using interferometer to test an optical component with super- long radius will face two very difficult problems: how to measure the radius precisely and how to avoid air disturbance and vibration, especially for a convex surface. In order to solve these problems we design a cement doublet, which is combination of plano-convex and plano-concave lenses, as a compensator to generate super-long focal length. This cement doublet looks like a plane plate, but has very little optical power. Two cemented lenses are made of different optical glasses with very small differential of refraction index. This Compensator is inserted between the interferometer and the optical component to be tested. Advantages of above design are the distance between the interferometer and tested component can be shortened to a desired value and air disturbance and vibration can be reduced to an acceptable level. Only thing you should do is to control the refraction index difference tightly.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jingchi Yu, Xiafei Sun, and Peiji Guo "Superlong-radius measurement", Proc. SPIE 4231, Advanced Optical Manufacturing and Testing Technology 2000, (6 October 2000);

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