Assessment of Optical Coatings Prepared by Molecular Beam Techniques / KL. Lewis, JA. Savage, AG. Cullis, NG. Chew, L. Charlwood, DW. Craig

Conference Author: Laser Induced Damage in Optical Materials: 1984 (1984 : National Bureau of Standards (NBS), Boulder, Colorado)
Physical Description: 1 online resource (9 pages) : illustrations, figures, tables
Additional Creators: Charlwood, L., Chew, NG., Craig, DW., Cullis, AG., Lewis, KL., Savage, JA., American Society for Testing and Materials, and ASTM International

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Summary

Thin films of ZnSe and other materials have been produced by molecular beam techniques in an ultra-high vacuum facility dedicated to the examination of fundamental aspects of thin film technology as applied to optical coatings. The ZnSe films have negligible values of absorptance at 10.6 ?m and have laser damage thresholds in the range 35¿̐ư38J/cm2, a significantly higher energy density than hitherto reported for ZnSe films. Examination of the films in cross section by high resolution transmission electron microscopy has revealed a polycrystalline columnar morphology, with the crystallite size dependent on deposition temperature. A complete absence of intergranular voids is noted which renders the film impervious to the ingress of water and other impurities when exposed to the atmosphere. This feature, together with the inherently high purity of the film is believed to be the factor responsible for the enhancement in laser damage threshold.

Dates of Publication and/or Sequential Designation

Volume 1986, Issue 954 (January 1986)

Subject(s)

ISBN

9780803149977 (e-ISBN)
9780803109605
0803109601

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text file PDF

Bibliography Note

Includes bibliographical references 10.

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Also available online via the World Wide Web. Tables of contents and abstracts freely available; full-text articles available by subscription.
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Electronic reproduction. W. Conshohocken, Pa. : ASTM International, 1986. Mode of access: World Wide Web. System requirements: Web browser. Access may be restricted to users at subscribing institutions.

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Mode of access: World Wide Web.

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