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TGG Crystal Faraday Rotator
TGG (Terbium Gallium Garnet) single crystal is currently the best and widely used magneto-optical material in Faraday rotator and isolator due to its extremely high Verdet constants in the range of 400nm-1100nm(excluding 475-500 nm). By placing a rod of this material in a strong magnetic field, Faraday rotation angles of over 45° can be achieved. This allows the construction of Faraday rotators which are the principal component of Faraday isolators, devices which transmit light in only one direction.
Features of TGG Crystal
- Low optical losses (<0.1%/cm)
- High thermal conductivity (7.4W /m /K)
- High laser damage threshold (>1 GW/cm²)
- Main Application: Faraday Rotator, Optical Isolator etc.
Faraday Rotator Glass
Magneto Optical Glass / Faraday rotator glass materials Tb-10, Tb-12 and Tb-15 are designed for laser light flux output control in the magnetic field in visible and near-IR spectral range. It is used in manufacture of faraday rotating components based on Faraday rotation of the light polarization plane, such as optical isolators, circulators, magneto-optical modulators, fast optical switches, interleavers, laser gyroscopes, goniometric devices, magneto-optic storage and optical information process system, current measuring transducers for magnetic field measuring and high-voltage transmission line, new generation current sensors, wave guides, astrology, spaceflight control, satellite survey and other functional devices. TG-28 is characterized by a high verdet constant and a lower nonlinear refractive index to avoid selffocusing in high power laser system.
Properties of TGG crystal and Tb:Glass
| Material | TGG | Tb:Glass |
| Bulk damage threshold @10ns 1064nm | 5 J/cm² | 2 J/cm² |
| Absorption coefficient @1064nm | <0.0035 /cm | <0.005 /cm |
| Extinction Ratio | 30 dB | 30 dB |
| Nonlinear Refractive Index | 8 x 10E-13esu | 2.7 x 10E-13esu |
| Index of Refractive @1064nm | 1.95 | 1.72 |