Sapphire windows are used in some non-ornamental applications, including infrared optical components, such as in scientific instruments; high-durability windows and movement bearings;Due to sapphire's remarkable hardness (third hardest mineral, right behind diamond and moissanite).Single Crystal Sapphire also used for various kinds of vacuum equipment, windows in reaction furnaces, scanner windows, and caps for optical communication due to its excellent mechanical characteristics and heat resistance
Features of Sapphire Crystal
1. High-hardness - abrasion resistance
2. Transparency - in the range from ultraviolet to infrared light (0.15 - 5.5 µm)
3. Chemical resistance and heat resistance - resist almost all kinds of acid and alkaline, heat up to 2000 ºC.
4. Suitable for the application of insulation property required.
Sapphire Crystal Property
Crystal structure: Hexagonal
Lattice: a=4.785Å, C=12.991Å
Density: 3.98g/cm3
Transmission Range: 150-5500nm
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 Coefficient: 5.8x10E-6/K
dn/dT: 13x10E-6/K @633nm
Hardness: 9 Mohs
Refractive Index: 1.83 @0.26mm, 1.76 @0.63mm, 1.58 @5.57m
Sapphire Crystal Applications
- UV and IR Optics
- Windows for High Temperature and Pressure, Corrosion Resistance, Abrasion Resistance
- Heat Sink and Thermocouplers; Semiconductor Wafer Carriers
- Electrical Insulators
- Thin Film Deposition
- Transparent Electronic Substrate
- Silicon on Sapphire Wafers; Superconductor Substrate
Sapphire Crystal Window Specifications
|
Material |
Sapphire |
|
Dimension |
2-600mm |
|
Dimension tolerance |
+/-0.03mm |
|
Thickness tolerance |
±0.005mm |
|
Flatness |
λ(general),λ/8(high precision) |
|
Parallelism |
3 min(General), 10 sec(High precision) |
|
Surface quality |
5/10；20/10；40/20，60/40 |
|
Clear aperture |
>90% |
|
Coating |
AR/AF/IR/dielectric film/metal film/laser film |
Available dimension at stock
|
Diameter (mm) |
Thickness (mm) |
Material
|
|
2.50 |
0.50 |
Sapphire |
|
5.00 |
1.00 |
Sapphire |
|
6.35 |
0.50 |
Sapphire |
|
7.50 |
0.40 |
Sapphire |
|
9.50 |
0.50 |
Sapphire |
|
10.00 |
1.00 |
Sapphire |
|
12.70 |
3.20 |
Sapphire |
|
12.75 |
1.00 |
Sapphire |
|
13.00 |
0.50 |
Sapphire |
|
15.00 |
2.00 |
Sapphire |
|
17.25 |
2.00 |
Sapphire |
|
20.00 |
2.00 |
Sapphire |
|
22.00 |
1.00 |
Sapphire |
|
23.75 |
1.00 |
Sapphire |
|
25.00 |
2.30 |
Sapphire |
|
25.40 |
2.30 |
Sapphire |
|
30.00 |
1.00 |
Sapphire |
|
31.75 |
1.00 |
Sapphire |
|
34.00 |
3.00 |
Sapphire |
|
35.00 |
1.00 |
Sapphire |
|
38.00 |
1.00 |
Sapphire |
|
40.00 |
2.00 |
Sapphire |
|
50.00 |
3.00 |
Sapphire |
|
60.00 |
5.00 |
Sapphire |
|
75.00 |
2.00 |
Sapphire |
|
100.00 |
2.00 |
Sapphire |
|
125.00 |
2.00 |
Sapphire |
|
150.00 |
3.00 |
Sapphire |
