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ASTM Selected Technical Papers
Laser Induced Damage in Optical Materials: 1989
By
HE Bennett
HE Bennett
1
Naval Weapons Center
?
China Lake, California 93555
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LL Chase
LL Chase
2
Lawrence Livermore National Laboratory
?
Livermore, California 94550
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AH Guenther
AH Guenther
3
Los Alamos National Laboratory
?
Los Alamos, New Mexico 87545
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BE Newnam
BE Newnam
4
Los Alamos National Laboratory
?
Los Alamos, New Mexico 87545
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MJ Soileau
MJ Soileau
5
University of Central Florida
?
Orlando, Florida 32816
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ISBN-10:
0-8031-4478-4
ISBN:
978-0-8031-4478-1
No. of Pages:
671
Publisher:
ASTM International
Publication date:
1990

Reaction bonded silicon carbide (RB SiC) can be readily fabricated to near net shape and mirror blanks produced by this method can potentially be less costly than those fabricated by chemical vapor deposition (CVD). However, RB SiC is two phase, SiC and up to 30% silicon (Si), and can not normally be directly polished to low scatter and roughness levels due to the difference in hardness of the two phases. We have investigated the polishability of RB SiC as a function of Si content and microstructure. Our results show that with a favorable microstructure, RB SiC can be polished to less than 10Å rms. For reduced roughness and lower scatter surfaces, we have developed low temperature deposition techniques to apply polishable, single phase coatings to the figured two phase surfaces. Scatter and roughness measurements show levels are comparable to CVD SiC.

1.
Paquin
,
Roger A.
;
Gardopée
,
George J.
;
Peterson
,
James
Hot Isostatic Pressed Beryllium Mirrors
,” in Proceedings of the Topical Meeting on High Power Laser Optical Components,
Hopkins
,
Alan
, ed. 1987 October 29–30;
Boulder, CO
.
Weapons Laboratory
, AFWL-CP-88-01, 1988 May. Pp 23–32.
2.
Magida
,
Matthew B
;
Paquin
,
Roger A.
Silicon Carbide Mirror Surface Technology
,” in Proceedings of the Topical Meeting on High Power Laser Optical Components,
Stanford
,
James L.
, ed. 1988 October 24–25;
Boulder, CO
.
Naval Weapons Center
, NWC TP 7017 Part 1, 1989 July. Pp 52–58.
3.
Fuchs
,
B. A.
Removal Rates, Polishing and Subsurface Damage of Chemical Deposited Silicon Carbide
,” presented at the OSA Workshop on Optical Fabrication and Testing, 1987 October 20–23;
Rochester, NY
.
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