The magneto-optical crystal TGG is an optimum material for Faraday devices (Rotator and Isolator) in the range from 400nm-1100nm, excluding 470-500nm.The Faraday rotator consists of a TGG rod contained inside a special designed magnet. The rotation sense of the polarization of a light beam passing through the rotator only depends on the direction of the magnetic field and not on the direction of propagation of the light beam. The optical isolator is a Faraday rotator set between two suitably aligned polarizers which allows a light beam to pass through in one direction only. TGG has a combination of excellent properties such as large Verdet constant, low light loss, high thermal conductance and high light damage threshold which makes it a unique material for Faraday devices particularly suitable for YAG lasers and Ti: sapphire tunable lasers, ring lasers and seed injected lasers.
Physical and Optical Properties:
Chemical Formula | Tb3Ga5O12 |
Lattice Parameter | a=12.355 |
Growth Method | Czocralski |
Density | 7.13g/cm3 |
Mohs Hardness | 8.0 |
Melting Point | 1725℃ |
Refractive Index | 1.954 at 1064nm |
Thermal Conductivity | 7.2Wm-1K-1 |
Absorption Coefficient | 0.0015cm-1 |
Verdet Constant | 0.12min/Oe.cm at 1064nm |