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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

A wide-spectrum antireflective coating has been developed for fused-silica optics. This coating provides antireflectivity down to ∼300 nm on fused silica, increasing its transmission to better than 99%. The coating is a single-layer graded-index film applied from special polymer-oxide solutions. The graded index results from nonscattering porosity and tailoring of the pore morphology. Unlike state-of-the-art techniques, however, the method does not involve phase-separated glasses, not does it require etching for the creation of porosity. The damage thresholds of coated fused silica optics at 350 nm initially varied from less than 1 J/cm2 to 9 J/cm2. The main causes of this large variation in the damage threshold were investigated and determined to be substrate polishing, substrate surface cleaning, and coating solution chemistry and processing which, under certain conditions, leads to carbon formation during the heat treatment of the coating.

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