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Proceedings Paper

Production Tests For Infrared Lenses
Author(s): M. O. Lidwell
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Paper Abstract

Inhomogeneity in an optical material can generally be observed at any wavelength for which the material will transmit radiation. For infra-red materials with no visual transmission, useful tests can be performed using a vidicon sensitive to radiation of up to 2 microns wavelength. The CO2 laser though difficult to use for interferometry is ideal for simple transmission measurements. The MFT which is generally accepted as a standard of imaging performance can be determined from spread functions which can be measured with simple although necessarily well engineered equipment. Standards for homogeneity of materials however need to be established to allow the system manufacturer to select suitable material. It is desirable to refine the methods described to provide adequate tests for systems of diffraction limited performance.

Paper Details

Date Published: 14 October 1977
PDF: 8 pages
Proc. SPIE 0109, Advances in Optical Production Technology I, (14 October 1977); doi: 10.1117/12.955508
Show Author Affiliations
M. O. Lidwell, Barr and Stroud Ltd. (UK)

Published in SPIE Proceedings Vol. 0109:
Advances in Optical Production Technology I
Thomas L. Williams, Editor(s)

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