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.

Crystal Parameters:

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	9.4x10-6℃-1
Verdet Constant	0.12min/Oe.cm  at 1064nm

Specifications:

Orientation		<111> within 5 degrees
Wave front Distortion		< 1/8 wave total  (at 633nm)
Extinction Ratio		>30dB
Dimtional Tolerances	Diameter	+0.00mm/-0.05mm
	Length	±0.2mm
Chamfer		0.13mm (+0.00mm,-0.08mm) at 45°±5°
Flatness		< 1/10 wave at 633nm
Parallelism		< 1 minutes of arc
Perpendicularity		< 1 degree
Scratch-dig		10-5 per MIL-O13830A