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Proceedings Paper

In Process Test Procedures For A Diamond Turned Germanium Aspheric Lens Of High Quality
Author(s): J. K. Myler
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Paper Abstract

Numerically controlled single point diamond turning is an important alternative manufacturing technology to conventional polishing for the manufacture of infra-red optics. The technology is capable of creating high quality aspheric surfaces on materials such as germanium, silicon zinc sulphide, and zinc selenide. It is essential that in-process optical test methods are applied consistent with a logical sequence of manufacturing steps which can be tested for appropriate accuracy at each stage. Certain machines are suited to machine based optical test using laser interferometric methods. Test methods are described which allow aspheric lenses to be created. Results are presented for a 50 mm F/2 germanium lens which outline the in-process tests employed and are supported by IR performance data for phasefront aberration and M.T.F. The optical performance agrees well with the design and represents current state of art diamond machining.

Paper Details

Date Published: 11 October 1988
PDF: 7 pages
Proc. SPIE 0916, Infrared Systems--Design and Testing, (11 October 1988); doi: 10.1117/12.945570
Show Author Affiliations
J. K. Myler, British Aerospace PLC (United Kingdom)

Published in SPIE Proceedings Vol. 0916:
Infrared Systems--Design and Testing
Peter R. Hall; John S. Seeley, Editor(s)

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