Sapphire optical crystal is an excellent material used in application which required broad spectral ranges and high durability. Sapphire transmits light over a broad wavelength range spanning from 0.15um to 5um, it also has high-temperature resistance up to 2000 ℃, good thermal conductivity, high hardness (Morse 9th) and good chemical stability. Usually Sapphire crystal used in FTIR spectroscopy, FLIR imaging and crystal substrate. especially for blue, purple,white light-emitting diodes (LED) and blue light laser (LD).
Parameter
Property | Value |
Chemical formula | Al2O3 |
Crystal structure | Hexagonal |
Lattice parameters | a=b=4.758 Å, c=12.991 Å |
Density | 3.97 g/cm3 |
Melting Point | 2040°C |
Refractive Index | n=1.814 @300nm n=1.623 @500nm |
Thermal Conductivity /(W·m-1·K-1) | 45 |
Thermal Expansion/ (10-6K-1) | 5.3 |
Specific Heat at 300K/ (J·g-1·K-1) | 0.7788 |
Hardness (Mohs) | 9 |
Poisson’s ratio | 0.27 |
Young`s Modulus / GPa | 344 |
Surface | <λ /8@632nm |
Clear aperture | >90% |
Orentation tolerance | <0.5˚ |
Parallel | 10˝ |
Perpendicular | 5΄ |
Surface quality | 10/5 (Scratch/Dig) |
Chamfer | <0.2ⅹ45˚ |
Wavefront distorsion | <λ /8@632nm |
Thickness/Aperture tolerance | ±0.1mm |
- Extreme surface hardness
- High temperature resistance
- Good thermal conductivity
- Wide transmitting wavelength
- Excellent electric and dielectric properties
- Excellent chemical resistance
- Thin and high-strength window
- Right angle prism
- Transparent electronic substrate
- High temperature and pressure window
- Optical substrates
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