Testing Diamond Turned Aspheric Optics Using Computer-Generated Holographic (CGH) Interferometry

David C. Smith

doi:10.1117/12.932733

31 March 1982 Testing Diamond Turned Aspheric Optics Using Computer-Generated Holographic (CGH) Interferometry

David C. Smith

Proceedings Volume 0306, Contemporary Methods of Optical Fabrication; (1982) https://doi.org/10.1117/12.932733
Event: 25th Annual Technical Symposium, 1981, San Diego, United States

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.

Citation Download Citation

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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