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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.
We provide high quality and optical homogenity YAG with different dimensions
and specifications for the use in industrial, medical and scientific
fields. YAG is grown utilising the Czochralsky technique. The as-grown
crystals are then processed into rods, slabs or prisms, coated and inspected
per customer specifications. YAG shows no trace absorbtion in the 2
- 3 µm region where Glasses tend to be highly absorbent because
of the strong H2O band. |
Main
properties
| Crystal structure |
cubic |
| Transmission
range, nm |
250 - 5000 |
| Density,
g/cm3 |
4.5 |
| Mohs hardness |
~8.5 |
| Specific
heat, W x s x g-1 x °K-1 |
0.59 |
| Thermal conductivity,
W x cm-1 x °K-1 |
0.14 |
| Thermal expansion
coefficient |
6.9 x 10-6
x °K-1 |
| Thermal shock
resistance, W x m-1 |
790 |
| Termooptical
factor (dn/dT), at 633 nm |
7.3 x 10-6
x °K-1 |
| Refractive
indexes: |
- |
| at 0.8 µm |
1.8245 |
| at 1.0 µm |
1.8197 |
| at 1.4 µm |
1.8121 |
Main Specifications
of YAG Windows
| Orientation |
[111]
within 5° |
| Diameter |
+/-0.1mm |
| Thickness |
+/-0.2mm |
| Flatness |
better than
l/8@633nm |
| Parallelism |
better than
30'' |
| Perpendicularity |
better than
5' |
| Scratch-Dig |
20-10 per
MIL-O-1383A |
| Wavefront
Distortion |
better than
l/2 per inch@1064nm |
Deliveries from ground
blanks to finished as well as processed optical elements are possible.
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