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TGG (Terbium Gallium Garnet) is an excellent magneto-optical crystal used in various Faraday devices (Rotator and Isolator) in the range of 400-1100nm, excluding 470-500nm. The faraday rotator is made up of TGG crystal bars and a special designed magnet. TGG is the most suitable material for Faraday devices. It is widely used for YAG lasers and Ti:sapphire tunable lasers, ring lasers, and seed injected lasers.
TGG Crystal Features:
- Large Verdet Constant
- Low optical losses
- High thermal conductivity
- High laser damage threshold
TGG Crystal Properties：
|
Chemical Formula |
Tb3Ga5O12 |
|
Lattice Parameter |
a=12.355 |
|
Growth Method |
Czocralski |
|
Verdet Constant |
0.12min/Oe.cm at 1064nm |
|
Refractive Index |
1.954 at 1064nm |
|
Density |
7.13g/cm3 |
|
Mohs Hardness |
8 |
|
Melting Point |
1725℃ |
|
Thermal Conductivity |
7.2Wm-1K-1 |
|
Absorption Coefficient |
0.0015cm-1 |
TGG Crystal Product Specifications：
|
Orientation |
[111] or [100] within 5 degrees |
|
Wavefront Distortion |
< λ/8 @633nm |
|
Extinction Ratio |
> 30dB |
|
Diameter Tolerance |
+0.00mm/-0.05mm |
|
Length Tolerance |
±0.2mm |
|
Chamfer |
0.2mm @45o |
|
Flatness |
< λ/10 at 633nm |
|
Parallelism |
< 1 arc min |
|
Perpendicularity |
< 5 arc min |
|
Surface Quality |
10/5 Scratch/Dig (MIL-O13830A) |
|
AR coating |
< 0.2% @ 1064nm |