Paper
31 March 1982 Testing Diamond Turned Aspheric Optics Using Computer-Generated Holographic (CGH) Interferometry
David C. Smith
Author Affiliations +
Abstract
The use of a CNC 2-axis diamond turning machine has enabled a variety of aspheric optics to be fabricated. These optics, which are both reflective and refractive elements, require a testing method equally versatile. Computer-generated holographic (CGH) interferometry is a method ideally suited to this unique, emerging optical fabrication technique. The same mathematical formula used to fabricate the part is used to also design the hologram. The hologram serves as a reference master and is designed for each individual asphere. This method permits even generalized aspheres to be tested with relative ease. Many aspheres designed for use in infrared systems may be too extreme to be adequately represented by a hologram. This limitation is economically overcome through the use of simple null lenses. These lenses are used to null the lower order aberrations, thus allowing the hologram to cancel the higher order departures. The limitations of the hologram, the use and design of null lenses, and examples of testing aspheres are given.
© (1982) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
David C. Smith "Testing Diamond Turned Aspheric Optics Using Computer-Generated Holographic (CGH) Interferometry", Proc. SPIE 0306, Contemporary Methods of Optical Fabrication, (31 March 1982); https://doi.org/10.1117/12.932733
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CITATIONS
Cited by 3 scholarly publications.
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KEYWORDS
Aspheric lenses

Holograms

Computer generated holography

Interferometry

Interferometers

Lenses

Optical design

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