1 January 1992 Design, fabrication, and application of diamond-machined null lenses for testing generalized aspheric surfaces
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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.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James T. McCann, 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); doi: 10.1117/12.134854; https://doi.org/10.1117/12.134854
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