Design, fabrication, and application of diamond-machined null lenses for testing generalized aspheric surfaces

James T. McCann

doi:10.1117/12.134854

1 January 1992 Design, fabrication, and application of diamond-machined null lenses for testing generalized aspheric surfaces

James T. McCann

Author Affiliations +

Proceedings Volume 1531, Advanced Optical Manufacturing and Testing II; (1992) https://doi.org/10.1117/12.134854
Event: San Diego, '91, 1991, San Diego, CA, United States

Abstract

This paper describes the optical design, fabrication and use of single element null lenses for the interferometric testing of generalized aspheric surfaces. The aspheric singlet is designed to work in collimated light, without a field lens, and allows for measurement of surface figure error over the entire clear aperture. The null lens is a single element of multispectral zinc sulfide (ZnS). This material is durable, easily diamond machined and provides good transmission at the test wavelength of 0.6328 (mu) . All reference surfaces needed for alignment are diamond machined into simple collars that hold the null lens and surface under test. This allows easy and accurate optical alignment and minimizes setup time. The procedures for optical layout and alignment will be discussed as well as an error analysis including fabrication and alignment sensitivities. Several examples of the use of this element for testing aspheric surfaces will illustrate the technique. Finally, an extension of the technique to diffractive null optics will be presented.

Citation Download Citation

James T. McCann "Design, fabrication, and application of diamond-machined null lenses for testing generalized aspheric surfaces", Proc. SPIE 1531, Advanced Optical Manufacturing and Testing II, (1 January 1992); https://doi.org/10.1117/12.134854

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