TGG Crystals
Large Verdet Constant: Approximately 40 Rad T^-1 m^-1, indicating strong magneto-optical effects.
Superb Thermal Properties: Thermal conductivity of 7.4 W/m/K, providing excellent thermal management.
Low Optical Losses: Less than 0.1% per centimeter, ensuring minimal light attenuation.
High Damage Threshold: Can withstand laser-induced damage thresholds greater than 1 GW/cm².
Better Performance: Outperforms terbium-doped glasses in high average power fiber lasers due to greater Verdet constant and lower optical losses.
Applications: Faraday Rotators, Magneto-Optical Modulators, Circulators, Current Measuring Transducers, etc.
TGG crystal, with the chemical composition TbGa5O12, is a widely used magneto-optical material for manufacturing Faraday rotators and various other magneto-optical components. Its transmission range spans from visible to near-infrared (400-1100nm, excluding 475-500nm). When a TGG crystal is placed in a magnetic field, it induces a non-reciprocal rotation of polarization, forming the principle of an optical isolator. This rotation in the polarization plane also enables the creation of various other optical devices such as magneto-optical modulators, circulators, and current measuring transducers.
Specifications:
| Orientation | [111}Within ±15′ |
| Extinction Ratio | >30dB |
| Length Tolerance | ±0.2mm |
| Diameter Tolerance | ±0.1mm |
| Surface Flatness | <λ/8@633nm |
| Surface Quality | 10/5 S/D |
| Wavefront Distortion | <λ/8@633nm |
| Parallelism | 20 arc sec |
| Perpendicularity | ≤15 arc min |
| AR Coating | Ravg0.2% @1064nm |
| Chamfer | ≤0.2mmx45° |
Advantages:
- Large Verdet Constant: Approximately 40 Rad T^-1 m^-1, indicating strong magneto-optical effects.
- Superb Thermal Properties: Thermal conductivity of 7.4 W/m/K, providing excellent thermal management.
- Low Optical Losses: Less than 0.1% per centimeter, ensuring minimal light attenuation.
- High Damage Threshold: Can withstand laser-induced damage thresholds greater than 1 GW/cm².
- Better Performance: Outperforms terbium-doped glasses in high average power fiber lasers due to greater Verdet constant and lower optical losses.
Applications:
- Faraday Rotators: Key component in optical isolators to prevent back reflections and enhance laser performance.
- Magneto-Optical Modulators: Devices that modulate light using magnetic fields for various optical applications.
- Circulators: Used in optical systems to control the direction of light flow.
- Current Measuring Transducers: Devices that measure electrical current by detecting the magnetic field effects on light.
