TGG

Terbium Gallium Garnet (TGG) is the right crystal material for Farady devices(Rotator and Isolator). The Farady ratator is made up of a TGG rod contained in a special designed magnet. The polarization of a light beam passing through the rotator makes rotation.The direction of rotation is only dependent on the direction of the magnetic field and not on the direction of propagation of the light beam.The optical isolator consists of a 45 degree rotator set between two suitably arrayed polarizers which allow a light beam to pass through in one direction only. With a combination of excellent properties, such as large verdet constant,low light loss, high thermal conductance and high light damage threshold,TGG is the unique material for Farady devices. It is widely used for YAG lasers and Ti:sapphire tunable lasers,ring lasers ,etc.