藍寶石（Al2O3）是最堅硬的礦物和光學(xué)材料之一，可用于紫外線至約5μm的范圍。藍寶石是惰性的，能抵抗大多數(shù)加工環(huán)境（如氫氟酸）的侵蝕。藍寶石的熔點超過2000°C，導(dǎo)熱系數(shù)高，適合在惡劣環(huán)境中使用。

Diameter: +0.0/-0.2mm
Thickness: ±0.2
Surface Quality (S/D): <60/40
Parallelism: <5 arc minute

Diameter: <5mm to 50mm+
Diameter Tolerance: ±0.1mm
Centre Thickness: up to 30mm
Centre Thickness Tolerance: ±0.05mm
Clear Aperture: >90%
Form Error @ 633nm: λ/4
Centration tolerance: <1 arc minute
Surface Radius Tolerance: <1 fringe
Linear Dimension: up to 50mm
Linear Tolerance: ±0.1mm
Angular Tolerance: <5 arc minutes
Edge finish: Ground, blacked
Chamfer: 0.3×0.3 @ 45°
Surface Quality (S/D): 20-10

Part No. Diameter (mm) T (mm) Coating
WMG1908 19 8.5 Uncoated
WMG2500 25 1 Uncoated
WMG2501 25 2 Uncoated
WMG2502 25 3 Uncoated
WMG2503 25 4 Uncoated
WMG2504 25 5 Uncoated
WMG3200 32 3 Uncoated