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Characteristic of Optical Crystals
 |
In general, molecules in glass are bound and aligned randomly, but aligned with regularity in crystals, helping to keep impurities out of crystals and allowing production of relatively high-purity materials. Crystals can be optically uniaxial or biaxial, depending on the regularity of the crystal structure, and it is often necessary to consider the axial directions of crystals. A wide range of optical crystal materials exists, including materials that transmit vacuum ultraviolet light or infrared light at wavelengths of dozens fÊm or above, hygroscopic materials that require special handling, and toxic materials such as ZnSe and BaF2. Select the appropriate material for the application in question. Most optical crystal materials in current use are synthesized, except for those used as polarization elements, which are produced from calcite.
Crystal materials not shown in the table below may be available upon request. Please contact us for more information.
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Characteristics of Optical Crystal |
| |
Calcium Fluoride
CaF2 |
Silicon
Si |
Zinc Selenide
ZnSe |
Sapphire
Al2O3 |
Germanium
Ge |
Barium Fluoride
BaF2 |
Lithium Fluoride
LiF |
Magnesium Fluoride
MgF2 |
| Transmissive RAnge(μm) |
0.13 to 8 |
1.2 to 8 |
0.6 to 20 |
0.23 to 5 |
2 to 20 |
0.18 to 12 |
0.12 to 8 |
0.12 to 7 |
| Refractive Index |
1.43
(1μm) |
3.44
(3μm) |
2.44
(3μm) |
1.76
(0.9μm) |
4.01
(5μm) |
1.47
(1μm) |
1.39
(1μm) |
1.39
(0.9μm) |
| Reflection Loss (per surface) |
3.1%
(1μm) |
30%
(3μm) |
17.5%
(3μm) |
7.6%
(0.9μm) |
36%
(5μm) |
3.6%
(1μm) |
2.7%
(1μm) |
2.5%
(0.9μm) |
| Density (g/cm3) |
3.18 |
2.33 |
5.27 |
3.98 |
5.33 |
4.89 |
2.64 |
3.17 |
| Thermal Conductivity (W/m, K) |
9.71 |
148 |
18 |
22.2 |
58.6 |
11.7 |
4 |
0.3 |
| Thermal Expansion Ratio (x 10-6/°C) |
19 |
4.15 |
7.6 |
6.7 (Parallel to C axis) |
5.5 |
18 |
37 |
12.8 (Parallel to C axis) |
| Water Solubility (g/100g) |
1.7 x 10-3
(20°C) |
- |
- |
- |
- |
0.17
(23°C) |
0.27
(20°C) |
7.6 x 10-3
(18°C) |
| Note |
- |
- |
- |
Uniaxial Crystal |
- |
- |
- |
Uniaxial Crystal |
SIGMA KOKI CO.,LTD.
Tokyo Head office
5F, SIGMA KOKI Tokyo Head office 1-19-9, Midori, Sumida-ku, Tokyo, 130-0021, JAPAN
TEL.+81-3-5638-8228 FAX.+81-3-5638-6550 international@sigma-koki.com
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