Using a long-wavelength (10.6-um) interferometer to test a torus

Zhishan Gao; Jinbang Chen; Lei Chen; Aiming Ge

doi:10.1117/12.318332

5 August 1998 Using a long-wavelength (10.6-μm) interferometer to test a torus

Zhishan Gao, Jinbang Chen, Lei Chen, Aiming Ge

Author Affiliations +

Proceedings Volume 3557, Current Developments in Optical Elements and Manufacturing; (1998) https://doi.org/10.1117/12.318332
Event: Photonics China '98, 1998, Beijing, China

Abstract

A torus is a kind of aspherical surface, different from quadratic rotary surface. It plays an important role in special optical systems. However, up to now there is no effective method to test its wavefront. In this paper, a method is proposed using long wavelength (10.6 micrometers ) IR interferometry to test a torus, whose curvature radii is different from submillimeter deducing to micrometer, the principle is also given. Then a example torus is tested in self-developed IR spherical interferometer. When this torus is placed in typical positions along the optical axis, some interferograms are shown. According to these interferograms the wavefront error and the difference of two radii can be obtained and shown in this paper.

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Zhishan Gao, Jinbang Chen, Lei Chen, and Aiming Ge "Using a long-wavelength (10.6-μm) interferometer to test a torus", Proc. SPIE 3557, Current Developments in Optical Elements and Manufacturing, (5 August 1998); https://doi.org/10.1117/12.318332

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KEYWORDS

Interferometers

Spherical lenses

Wavefronts

Interferometry

Germanium

Beam splitters

Carbon dioxide lasers

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