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Proceedings Paper

Test procedures for severely aspheric optics
Author(s): Michael H. Freeman; Caroline Gray
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Paper Abstract

Severely aspheric lenses have surfaces which depart from spherical by millimeters rather than microns. Optical testing of these lenses can be achieved using aspheric null mirrors. Although such mirrors can give full null compensation at diffraction limited precision most severely aspheric lenses are made by molding for applications which allow many fringes of form error. Diamond turned aspheric null mirrors verified by Form Taysurf methods give a test lens plus mirror systems which can be tested using either interference or a less sensitive autocollimation or encircled energy method more economical and more appropriate to the quality required.

Paper Details

Date Published: 19 August 1996
PDF: 11 pages
Proc. SPIE 2775, Specification, Production, and Testing of Optical Components and Systems, (19 August 1996); doi: 10.1117/12.246790
Show Author Affiliations
Michael H. Freeman, Precision Lens Co. Ltd. (United Kingdom)
Caroline Gray, Precision Lens Co. Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 2775:
Specification, Production, and Testing of Optical Components and Systems
Anthony E. Gee; Jean-Francois Houee, Editor(s)

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