High Light: | optical window,magnesium fluoride window |
---|
Description
Undoped Yttrium Aluminium Garnet (Y3Al5O12 or YAG) is a new substrate and optical material that can be used for both UV and IR optics. It is particularly useful for high-temperature and high-energy applications. The mechanical and chemical stability of YAG is similar to that of Sapphire, but YAG is not birefringent. This particular feature is extremely important for some optical applications
Feature
Application
Material and Specifications
Property |
Value |
Chemical formula |
Y3Al5O12 |
Crystal structure |
Cubic |
Lattice parameters |
a = 11.9538Å |
Density |
4.55 g/cm3 |
Melting Point |
1950°C |
Refractive Index (λ=550nm) |
1.84 |
Thermal Conductivity at 25℃ / (W·m-1·K-1) |
0.14 |
Thermal Expansion/ (10-6 ℃) |
6.9 |
Specific Heat at 300K/ (J·g-1·K-1) |
590 |
Hardness (Mohs) |
8-8.5 |
Young`s Modulus /GPa |
279.9 |
Shear Modulus / GPa |
113.8 |
Reflection loss |
16.7%@1.06um |
Poisson Ratio |
n/a |
Solubility |
Insoluble |
Polishing Specification for Optical Grade Ⅰ
Surface flatness |
<λ /8@632nm |
Clear aperture |
>90% |
Orentation tolerance |
<0.5˚ |
Parallel |
30˝ |
Perpendicular |
15΄ |
Surface quality |
10/5 (Scratch/Dig) |
Chamfer |
<0.2ⅹ45˚ |
Wavefront distorsion |
<λ /4@632nm |
Thickness/Aperture tolerance |
±0.1mm |
Polishing Specification for Optical Grade Ⅱ
Surface flatness |
<λ /10@632nm |
Clear aperture |
>90% |
Orentation tolerance |
<0.2˚ |
Parallel |
10˝ |
Perpendicular |
5΄ |
Surface quality |
10/5 (Scratch/Dig) |
Chamfer |
<0.2ⅹ45˚ |
Wavefront distorsion |
<λ /8@632nm |
Thickness/Aperture tolerance |
±0.021mm |