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Sapphire Crystal

Sapphire Crystal

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Features
 Large size Sapphire crystals up to 3' in boule are available from CryLight. As the hardest of oxide crystals, sapphire has a combination of optical and physical properties that make it the best choice for a variety of demanding applications. Sapphire maintains its strength even at high temperatures. It has good thermal properties, excellent electrical and dielectric properties and is resistant to chemical attack. These properties encourage the use of sapphire in aggressive environments where reliability, optical transmission and strength are required.
Specifications
Specifications:
Orientation: <001> or <111> +/- 5deg
Diameter Tolerance : +0.0 /-0.1mm
Thickness Tolerance: +/-0.2mm
Surface Quality: better than 80/50 scratch/dig
Parallelism: < 30 arcsec
Flatness: < λ per 25mm @632.8nm
Perpendicularity: < 5 arcmin
Wavefront Distortion: < λ/2 @632.8nm
Coating: Coating upon Request

Properties:
Crystal Structure Hexagonal System
Lattice a=4.785 Å, c=12.991 Å
Density 3.98 g/cm3
Transmission Range 0.15 - 5.5 mm
Melting Point 2040 °C
Specific Heat 0.418 W·s /g /K
Thermal Conductivity 25.12 W/m /K
Thermal Shock Resistance 790 W /m
Thermal Expansion 5.8x10-6 /K
dn/dT, @ 633nm 13x10-6 /K-1
Mohs Hardness 9
Refractive Index 1.83 (0.26mm), 1.76 (0.63mm), 1.58 (5.57mm)