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ASTM Selected Technical Papers
Laser Induced Damage In Optical Materials: 1983
By
HE Bennett
HE Bennett
1
Naval Weapons Center
?
China Lake, California 93555
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AH Guenther
AH Guenther
2
Air Force Weapons Laboratory Kirtland Air Force Base
,
New Mexico 87117
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D Milam
D Milam
3
Lawrence Livermore National Laboratory
?
Livermore, California 94550
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BE Newnam
BE Newnam
4
Los Alamos National Laboratory
?
Los Alamos, New Mexico 87545
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ISBN-10:
0-8031-0930-X
ISBN:
978-0-8031-0930-8
No. of Pages:
584
Publisher:
ASTM International
Publication date:
1985

The microstructure of thin films applied by conventional physical vapor deposition for use as optical coatings is columnar for most of the materials commonly used. This has been established for about a decade through numerous experimental observations employing microfractographical replication for use with high resolution transmission electron microscopes. Scanning electron microscopes are more useful investigating coating defects, the most remarkable of these defects being known as nodules. From fundamental considerations of nucleation and growth of thin films, the origin of both columns and nodules, and the dependence of their appearance on the deposition conditions, are discussed in some detail. A simple 2-D simulation model assuming very limited surface mobility of adatoms or admolecules shows striking similarities to peculiar properties of both columnar and nodular growth seen in actual investigations. Conclusions are drawn as to how the two types of microstructures described influence general thin film properties, but in particular as to how they influence possible laser damage mechanisms.

This paper is of a tutorial nature, although most of the results presented are from the author's own work, some of them having been published previously.

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;
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xxx
,
1984
. xxx
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