Description:
TGG crystal Terbium Gallium Garnet
TGG is an excellent magneto-optical crystal used in various Faraday devices(Polarizer and Isolator) in the range of 400nm-1100nm, excluding 475-500nm.
TGG crystal Terbium Gallium Garnet is an essential magneto-optical crystal l for faraday polarizer. Faraday polarizer is composed of the TGG crystal rod and a specially designed magnet. The polarization of the beam through the magneto-optical materials deflexed and direction of the deflection only has some relations with the direction of the magnetic field and has nothing to do with the direction of the beam propagation. An optical isolator is an optical component which allows the transmission of polarized light in only one direction.
Main application:
- FaradayIsolators
- FaradayPolarizer
Advantages:
- Large Verdet constant (35 Rad T-1 m-1)
- Low optical losses (<0.1%/cm)
- High thermal conductivity (7.4W m-1 K-1).
- High laser damage threshold (>1GW/cm2)
Basic properties of TGG crystal:
| Chemical Formula: | Tb3Ga5O12 |
| Lattice Parameter | a=12.355Å |
| Growth Method | Czochralski |
| Density | 7.13g/cm3 |
| Mohs Hardness | 8.0 |
| Melting Point | 1725℃ |
| Refractive Index | 1.954 at 1064nm |
HGO offers TGG specifications:
| Orientation: | <111> crystalline direction |
| Wavefront Distortion: | λ/10 per inch @ 632.8 nm |
| Dimension Tolerances： | rods with diameter: +0.0/-0.05 mm , Length: ±0.1 mm |
| Extinction Ratio | >30dB |
| Surface Quality: | 10/5 Scratch/Dig MIL-O-1380A |
| Parallelism: | < 10″ |
| Perpendicularity: | < 5′ |
| Clear Aperture: | > 90% |
| Surface Flatness: | < λ/10 @ 632.8 nm |
| Chamfer: | < 0.1 mm @ 45o |
| Size | Upon customer request |
| Coating | AR coating upon customer’s request |
| Damage Threshold | 750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz |
| Quality Warranty Period | One year under proper use |
