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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: [email protected]


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 /[email protected] or better

Chamfer

Protected <0.5mmx45deg

Coating

None, per your request





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