Undoped YAG is a new substrate and window material that can be used for both UV and IR optics. Undoped YAG we produce has non-scattering, non-dislocation , stable mechanical and chemical properties ,high thermal conductivity ,non-birefringence.
Specifitions:
|
orientation |
<111> crystalline direction within 5º |
|
Flatness |
<λ/10 |
|
Parallism
Perpendicularity |
≤30 arc seconds |
|
≤5 arc minutes |
|
Surface Quality |
10/5 Scratch / Digper MIL-O-13830A |
|
Optical Quality |
Interference fringes ≤ 0. 25 λ /inch |
|
Size |
Diameter2 ～ 15 mm
Length 3 ～ 200 mm
Upon request of customer |
|
Dimensional tolerances |
Diameter:+0.000"/-0.002"
Thickness: 0.04" /-0.00"
Chamfer: 0.006"±0.003" @45°± 5º |
|
AR-Coating Reflectivity |
≤ 0.2% (@1064nm) |
Main properties of YAG crystal
|
Physical and Chemical Properties |
|
Chemical formula |
Y3Al5O12 |
|
Crystal structure |
cubic |
|
Lattice Parameters |
12.01A |
|
Melting point: |
1950 °C |
|
Density, g/cm3 |
4.56 |
|
Mohs hardness |
8.5 |
|
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 |
7.8 x 10-6/ ℃ <111>
8.2 x 10-6/ ℃ <100>
7.7×10-6/ ℃ <110> |
|
Thermal conductivity |
14W/m/K |
|
Thermal Optical Coefficient (dn/dT) |
7.3 × 10-6/ ℃ |
|
Thermal Shock Resistance |
790W/m |
|
Spectral Properties |
|
|
Index of Refraction at 0.8 m m
at 0.9 m m
at 1.0 m m
at 1.2 m m
at 1.4 m m |
1.8245
1.8222
1.8197
1.8152
1.8121 |
|
Transmission Range |
250~5000nm |
|
Damage Threshold |
≥ 15Jcm-2 |
