OST Photonics Al2O3 Crystals (Sapphire)
OST PhotonicsAl2O3 Crystals (Sapphire)
Al2O3 crystals (Sapphire), featuring broad optical transmission from 150-5500nm spanning from UV to MWIR spectrum, and robust mechanical/thermal properties, are excellent for applications involving harsh and variant environments or requiring a broad transparent wavelength range (e.g. windows of sensors and detectors, IR applications, etc.). The material's most distinguishing attribute is its unequaled mechanical strength, being the second hardest material after diamond, single sapphire crystals have a Knoop Hardness of 1800-2200, making the windows made from single crystals sapphire resistant in extreme to chemical corrosion and abrasions. Custom sapphire windowsmight be produced into thin optics without fracturing because of the tight internal covalent bonding of single-crystal sapphire while demonstrating good thermal stabilities due to its high thermal conduction.
Application of Al2O3 Crystals (Sapphire)
Infrared windows
LED lighting
Semiconductor device
Advantages ofAl2O3 Crystals (Sapphire)
Features Extreme Surface Hardness Chemical Resistance
Transmits Wavelengths Ranging From UV to Mid-Infrared
Thinner and Stronger than Standard Glass Windows
Specifications of Al2O3 Crystals (Sapphire)
|
Orientation |
Random or as requested |
|
Size |
Upon the customer’s request |
|
Diameter Tolerance |
+0/-0.1 mm |
|
Thickness Tolerance |
+/-0.1 mm |
|
Aperture |
>90% |
|
Surface Quality |
60/40~10/5 (S/D) |
|
Parallelism |
<1 arc minute |
|
Chamfer |
|
|
Coating |
Uncoated or upon customer’s request |
Properties of Al2O3 Crystals (Sapphire)
|
Transmission Range |
|
|
Refractive Index |
No 1.75449; Ne 1.74663 at 1.06 micron |
|
Refractive Loss |
14% at 1.06 micron |
|
Absorption Coefficient |
|
|
Reststrahlen Peak |
|
|
dn/dT |
|
|
dn/dμ = 0 |
|
|
Crystal/Class Structure |
Trigonal (hex), R3c |
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Molecular Weight |
|
|
Cleavage Plane |
(1011), (1012), imperfect |
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Density |
|
|
Melting Point |
2040°C |
|
Hardness (Knoop) |
2000 with 2000g indenter |
|
Youngs Modulus |
335 GPa |
|
Shear Modulus |
|
|
Bulk Modulus |
240 GPa |
|
Poisson Ratio |
|
|
Elastic Limit |
300Mpa (45.000psi) |
|
Thermal Conductivity |
|
|
Specific Heat Capacity |
763 J Kg-1K-1at 293K (4) |
|
Dielectric Constant |
|
|
Elastic Coefficients |
C11=496 C12=164 C13=115 C33=498 C44=148 |
|
Solubility |
98 x 10^-6 g/100g water. |
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