Sapphire Window
What is
Sapphire Window
?
Sapphire Window
Sapphire Al₂O₃ can be very good for UV, VIS and NIR spectral bands of optical window materials because of its extreme toughness and strength. Sapphire can grow in a variety of ways. Verneuil and Czochralski methods are commonly used for standard grade sapphire materials. Higher quality sapphires, applied to electronic substrates, are grown by Kyropulos, which can obtain very high purity and have excellent UV transmission characteristics. The range of use in IR is limited to about 5um and encounters few difficulties at any optical level. It is in the ultraviolet range and must be observed carefully because the transmission from 140nm to 240nm is very sensitive to impurities and gap vacancies. Sapphire can grow in a variety of ways. Verneuil and Czochralski methods are commonly used for standard grade sapphire materials. Higher quality sapphires, applied to electronic substrates, are grown by Kyropulos, which can obtain very high purity and have excellent UV transmission characteristics. The range of use in IR is limited to about 5um and encounters few difficulties at any optical level. It is in the ultraviolet range and must be observed carefully because the transmission from 140nm to 240nm is very sensitive to impurities and gap vacancies.
Technical parameter
Transmission | 0.17~5.5μm |
|---|---|
Refractive index | No 1.75449; Ne 1.74663（1.06μm）（1） |
Reflection loss | 14％ at 1.06μm |
Absorption coefficient | 0.3×10 -3 cm -1 at 2.4μm （2） |
Absorption peak： | 13.5μm |
dn / dT | 13.4×10 -6（0.546μm）（3） |
dn /dμ= 0 | 1.5μm |
density | 3.97g/cm3 |
Melting point | 2040℃ |
Thermal conductivity | 27.21W m-1K-1 at 300K |
Thermal expansion | 5.6（para）& 5.0（perp）×10-6 / K * |
Hardness | Knoop 2000 with 2000g indenter |
Specific heat capacity | 763JKg-1K-1（293K）（4） |
Dielectric constant | 11.5（para）9.4（perp）at 1MHz |
Young's modulus (E) | 335GPa |
Shear modulus (G) | 148.1GPa |
Bulk modulus (K) | 240GPa |
Elastic coefficient | C11 = 496 C12 = 164 C13 = 115 C33 = 498 C44 = 148 |
Apparent elastic limit | 300 MPa（45,000 psi） |
Poisson's ratio | 0.25 |
Solubility | 98×10-6g / 100g water |
Molecular weight | 101.96 |
（hex），R3c | Trigonal（hex），R3c |
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