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Undoped YAG
CRYSTAL
Undoped YAG is a
substrate and window crystal that can be used for both
UV and IR optic. It is
particularly useful for high temperature and high
energy applications.
The mechanical stability of YAG is similar to Sapphire, butYAG is not
birefringent and is available with high optical
homogeneity.
.... Advantages of Undoped YAG Crystals
Non-birefringent
High bulk damage
threshold
High
index of refraction, facilitating low aberration lens
design
High
thermal conductivity
Stable mechanical and chemical
properties
Low
stress and high optical quality.
....
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Material and
Specifications |
|
Orientation |
[111] within 5° |
|
Wavefront
Distortion |
better than l/2
per inch@1064nm |
|
Diameter |
+/-0.1mm |
|
Thickness |
+/-0.1mm |
|
Flatness |
better than l/8@633nm |
|
Parallelism |
better than 30'' |
|
Surface Quality |
10-5(MIL-O-13830A) |
|
Chamfer |
0.006"±0.002" at 45°± 5° |
|
Perpendicularity |
better than 5' |
....
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Physical and Chemical Properties |
| Crystal Structure |
Cubic |
| Lattice Parameters |
12.01 Å |
| Melting Point |
1970℃ |
| Moh Hardness |
8.5 |
| Density |
4.56±0.04g/cm3 |
| Specific Heat (0-20) |
0.59J/g.cm3 |
| Modulus of Elasticity |
310GPa |
| Young's Modulus |
3.17×104Kg/mm2 |
| Poisson Ratio |
0.3(est.) |
| Tensile Strength |
0.13~0.26GPa |
| Thermal
Expansion Coefficient |
[100]Direction:8.2×10-6/℃(0~250℃) |
| [110]Direction:7.7×10-6/℃(0~250℃) |
| [111]Direction:7.8×10-6/℃(0~250℃) |
| Thermal
Conductivity |
14W/m/K(@20℃) |
| 10.5W/m/K(@100℃) |
| Thermal Optical
Coefficient (dn/dT) |
7.3×10-6/℃ |
| Thermal Shock
Resistance |
790W/m |
| Solubility |
Water: Insoluble;
Common Acids:
Slightly |
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