|
Large size Sapphire crystals up to 4'' boule are available from Red
Optronics. As the hardest of all 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.
Applications:
-
UV and IR Optics
-
Windows
for High Temperature and Pressure, Corrosion Resistance, Abrasion
Resistance
-
Heat Sinders and Thermocouplers; Semiconductor Wafer
Carriers
-
Electrical Insulators
-
Thin Film Deposition
-
Transparent Electronic Substrate
-
Silicon on Sapphire Wafers; Superconductor
Substrate
Basic Properties:
| Crystal structure |
Hexagonal System |
| 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 |
5.8x10-6/K |
| dn/dt, @633nm |
13x10-6/K |
| Hardness |
9 Mohs |
| Refractive Index |
1.83 @0.26mm,
1.76 @0.63mm, 1.58 @5.57mm |
Standard Specifications of Sapphire Windows and Mirrors:
| Diameter |
+/-0.0, -0.1mm |
| Thickness |
+/-0.2mm |
| Flatness |
better than l
per 25
@633nm |
| Parallelism |
better than 3' |
| Perpendicularity |
better than 5' |
| Scratch-Dig |
80-50 per MIL-O-13830A |
| Wavefront Distortion |
less than l/2 per inch(l@1064nm) |
Other high-precision Sapphire windows, AR- and HR-coatings are available
upon request. Sapphire boule grown by CZ method and as-cut Sapphire blocks
are also available.
|
