Sapphire (Al2O3)
One of the hardest optical materials in service (Mohs 9), with high thermal conductivity and broadband transmission from the UV into the MWIR. Specified for windows that face sand, rain, and pressure.
Flat optics material
Typical properties
- Transmission range
- 0.17 – 5.5 µm
- Refractive index
- 1.7545 @ 1.0 µm
- Knoop hardness
- 1800 – 2200 kg/mm²
- Density
- 3.98 g/cm³
- Thermal expansion (CTE)
- 5.3 × 10⁻⁶ /K (a-axis)
- Thermal conductivity
- 27 W/m·K
Published values for this material class, given to help you shortlist a substrate. They are not lot-specific guarantees. Request the SPEKTON datasheet for certified figures against your specification.
Download Technical Datasheet (PDF)Datasheet referenced from Crystran.
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