Faraday Devices TGG Single Magneto Optical Crystals
Magneto Optical Crystal TGG Single Crystal Can Replace YIG Crystal
Description:
TGG is an excellent magneto-optical crystal used in various Faraday devices(Polarizer and Isolator) in the range of 400nm-1100nm, excluding 475-500nm.
Faraday polarizer is composed of the TGG crystal rod and a special designed magnet. The polarization of the beam through the magneto-optical materials deflexes and direction of the deflection only has some relations with the direction of magnetic field and has nothing to do with the direction of the beam propagation. Optical isolator is an optical component which allows the transmission of polarized light in only one direction.
Features:
- Large Verdet Constant (Typical 35 dB,Up to 40dB)
- Low optical losses (<0.1%/cm)
- High thermal conductivity (7.4W m-1K-1).
- High laser damage threshold (>1GW/cm2).
- TGG has twice the Verdet constant of a terbium-doped glass.
- Thermal conductivity is an order of magnitude greater than typical glass.
- Optical losses are lower for TGG than Tb-doped glasses
Applications:
-
Faraday Rotator;
-
Optical Isolator.
Main Properties:
| Chemical Formula | TB3Ga5O12 |
| Lattic Parameter | a=12.355Å |
| Growth Method | Czochralski |
| Density | 7.13g/cm3 |
| Mohs Hardness | 8.0 |
| Melting Point | 1725℃ |
| Refractive Index | 1.954 at 1064nm |
CRYSTRO supply TGG crystal with:
| Orientation | [111] within ±15 arc min |
| Wave Front Distortion | <1/8 wave |
| Extinction Ratio | >35dB |
| Diameter Tolerance | +0.00mm/-0.05mm |
| Length Tolerance | +0.2mm/-0.2mm |
| Chamfer | 0.10mm@45º |
| Flatness | <1/10 wave at 633nm |
| Parallelism | < 30 arc Seconds |
| Perpendicularity | < 5 arc min |
| Surface Quality | 10/5 Scratch/Dig |
| AR Coating | <0.2% |
| Large Dimensions of Crystals | 2.0--76 mm in diameter |
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