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ASTM Selected Technical Papers
Laser Induced Damage in Optical Materials: 1978
By
AJ Glass
AJ Glass
1
Lawrence Livermore Laboratory
?
Livermore, California 94550
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AH Guenther
AH Guenther
2
Air Force Weapons Laboratory
?
Kirtland AFB, New Mexico 87117
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ISBN-10:
0-8031-0085-X
ISBN:
978-0-8031-0085-5
No. of Pages:
363
Publisher:
ASTM International
Publication date:
1979

We describe a laser calorimeter for measuring the absorption of an optical coating deposited on a thin disc. The sample with diameter 2.54cm and thickness between 0.02 to 0.13cm is irradiated with 6 watt CW Nd:YAG laser. The temperature of the coated disc is compared to that of a reference disc using thermistors in mechanical contact with the samples. Measurements are made under vacuum (100 torr) to reduce temperature variations caused by convection. The calorimeter was evaluated by measuring coated and uncoated discs of various thicknesses with absorptances from 9 × 10-6 to 5 × 10-3. These measurements demonstrated a repeatability of ± 2% at an absorptance level of 1 × 10-4 and a sensitivity for a 0.04cm thick substrate of 3.8 × 105 µV/watt. The lower absorption limit of the calorimeter is 2 × 10-6. The results of measurements on polished, uncoated fused silica discs with thicknesses from 0.04 to 0.13cm show a surface absorptance of 6 × 10-6 and a bulk value of 5 × 10-5/cm.

1.
Hordvik
,
A.
,
Appl. Opt.
 0003-6935 
16
, 2827 (
1977
).
2.
Moravec
,
T. J.
and
Bernal
G.
,
E.
,
Appl. Opt.
 0003-6935 
17
, 1938 (
1978
).
3.
Hass
,
M.
,
Optical Engineering
 0091-3286 
17
, 525 (
1978
).
4.
Decker
,
D. L.
and
Temple
,
P. A.
,
NBS Special Publication
 0083-1883 
509
, 281 (
1977
).
5.
Bernal
G.
,
E.
,
Appl. Opt.
 0003-6935 
14
, 314 (
1975
).
6.
Adams
,
J. A.
and
Roger
,
D. F.
,
Computer-Aided Heat Transfer Analysis
,
McGraw-Hill
,
1973
.
7.
Anthon
,
E.
,
Proceedings of the Society of Photo-Optical Instrumentation Engineers
,
140
(
1978
).
8.
Crisp
,
M. D.
,
Boling
,
N. L.
and
Dubé
,
G.
,
Appl. Phys. Lett.
 0003-6951 
21
, 364 (
1972
).
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