GGG
crystals
Gallium Gadolinium Garnet (Gd3Ga5O12 or
GGG) single crystal is material with good optical, mechanical and thermal properties
which make it promising for use in fabrication of various optical
components as well as substrate material for magneto – optical films and
high – temperature superconductors.
Standard products: wafers and substrates with sizes from 10 x 10 mm to dia. 76.2
mm, thickness 0.5 mm and 1.0 mm, one side or both sides polished 20/10 S/D, [111]
or [100] cut. Other products are available on request.
Material propeties
| Crystal structure |
cubic |
| Crystal
growth method |
Czochralsky |
| Crystal
growth orientation |
<111> |
| Melting point , °C |
1750 |
| Density,
g/cm3 |
7.08 |
| Lattice
parameter, A |
12.383 |
| Mohs
hardness |
7.5 |
| Thermal
expansion coefficient, K-1 |
8.2 - 10-6 |
| Dielectric
constant |
30 |
| Dielectric
loss tangent, at 10 GHz |
0.15 |
| Transmission
range, µm |
~3.0 x 10-4 |
| Refractive
index at: |
|
| 480 nm |
1.97 |
| 633
nm |
1.96 |
| 1064
nm |
1.95 |
| Transparency
range, nm |
400 - 7000 |
| Colour |
Colorless |
|
