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Optical Prop's
Optical Properties of Infrared Materials
In working with infrared energy there are applications for windows (used
for example in a vacuum chamber) or optical lenses (used for example in an IR camera)
through which the infrared energy must be transmitted. Various materials are utilized to
fabricate windows and lenses. The most common materials and the respective properties are
listed here.
|
Material |
LWL |
RI |
SF |
Flatness |
PR (PSI) |
Hygroscopic |
|
NaCl |
21.88 |
1.49@10 |
40/20 |
 /20
|
0.75 |
|
KBr |
29.00 |
1.52@10 |
60/40 |
/20 |
0.34 |
|
KCl |
25.97 |
1 .45@10 |
60/40 |
/20 |
0.70 |
|
Osl |
58.00 |
1.73@10 |
80/50 |
/10 |
1.73 |
Fluorides |
|
LiF |
9.05 |
1.39@0.5 |
40/20 |
/10 |
3.37 |
|
MgF2 |
7.87 |
1.38@0.5 |
40/20 |
/20 |
15.40 |
|
CaF2 |
11.16 |
1.40@5.0 |
40/20 |
/20 |
11.30 |
|
BaF2 |
14.47 |
1.45@5.0 |
40/20 |
/20 |
8.30 |
Oxides |
|
Al2O3 |
6.22 |
1.75@1.0 |
40/20 |
/2 |
89.60 |
|
ZrO2 |
6.99 |
2.13@1.0 |
60/40 |
/8 |
– |
|
SiO2 |
4.32 |
1 .53@1.0 |
40/20 |
/20 |
61.20 |
Silver Halides |
|
AgGl |
28.33 |
1.90@10 |
80/50 |
5 |
8.20 |
|
AgBr |
39.22 |
2.22@10 |
80/50 |
5 |
8.20 |
Semiconductors |
|
Si |
13.57 >500 |
3.41@10 |
60/40 |
/8 |
26.20 |
|
Ge |
23.15 |
4.00@10 |
60/40 |
/8 |
15.30 |
Others |
|
ZnSe |
21.69 |
2.40@10 |
40/20 |
/20 |
17.07 |
|
ZnS |
14.49 |
2.2@10 |
40/20 |
/20 |
21.33 |
|
Cleartran |
14.49 |
2.2@10 |
40/20 |
/20 |
32.00 |
|
CdTe |
31.95 |
2.67@10 |
80/50 |
/1 |
1.81 |
|
Diamond |
>500 |
2.41@0.6 |
40/20 |
/10 |
– |
|
KRS-5 |
49.02 |
2.37@10 |
60/40 |
/1 |
8.20 |
|
AMTIR |
16.86 |
2.5@10 |
80/50 |
/1 |
3.90 |
LWL — Long-wavelength limit where
absorption is 50% for a 1mm thick window
RI — Refractive index at
the wavelength indicated
SF — Surface finish
scratch and dig for routine polishing
Flatness— Achievable flatness at 0.6328 Fm for routine polishing
PR — Pressure rating in
pounds per square inch for a 25 mm2 x 1 mm thick window (safety factor of 4) |
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Address and Contact Information
Phone: 805 964 6701 Fax: 805 967 8590
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© Copyright Electro Optical Industries,
Inc., 1997 - 2007
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