Sapphire Window
Sapphire is a single crystal aluminum oxide (Al2O3). Its Mohs hardness is 9, it is one of the hardest materials. Sapphire has good mechanical strength, and it is also transparent from visible to IR spectrum. So, it is always used as window material where scratch resistance is required.
Lattice Constant: a =4.75 A; c =12.97ATransparent
Range: 180nm ~ 4500nm
Density: 3.98g/cm3Mohs Hardness: 9
Melting Point: 2030℃Thermal Conductivity: 0.04W/m/K
Expansion Coefficient: 8.4x10-6/K
Refractive Index: 1.755@1um
Lattice Constant: a =4.75 A; c =12.97ATransparent
Range: 180nm ~ 4500nm
Density: 3.98g/cm3Mohs Hardness: 9
Melting Point: 2030℃Thermal Conductivity: 0.04W/m/K
Expansion Coefficient: 8.4x10-6/K
Refractive Index: 1.755@1um
Specifications
|
Material |
Optical Sapphire |
|
Dimension Tolerance |
+0.0/-0.1mm |
|
Thickness Tolerance |
±0.2mm |
|
Clear Aperture |
>90% |
|
Parallelism |
<1arc minutes |
|
Surface Quality |
80/50 or better |
|
Flatness |
<λ /2@633nm or better |
|
Chamfer |
Protected <0.5mmx45deg |
|
Coating |
None, per your request |
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