Terbium Gallium Garnet(TGG,Tb3Ga5O12) is most commonly using magneto-optical crystal for Faraday devices (Rotator and Isolator), because of the combination of excellent properties such as large Verdet constant, low optical losses, high thermal conductance and high laser induced damage threshold, etc.
Verdet Constant: 35 Rad T-1m-1
Transmission range: 400-1100nm (excluding 470-500nm)
Refractive Index: 1.954 @ 1064nm
Absorption Coefficient: 0.1%/cm @ 1064nm
Thermal Conductivity: 7.2 W m-1K-1
Lattice Parameter: a=12.355Å
Density: 7.13 gram/cm3
Mohs Hardness: 8
Melting Point: 1725℃
Features and Standard specification from LNG Optics:
Orientation: [111] within ±15 arc min
Wavefront Distortion: λ/8 @ 633nm
Extinction Ratio: 30dB over 85% CA
Diameter +0/-0.05mm
Length ±0.2mm
Surface quality: 10/5 Scratch/Dig
Flatness：λ/10 @ 633nm
Parallelism: 30 arc seconds
Perpendicularity: 5 arc minutes
Chamfer: 0.1mm x 45°
High Laser damage threshold AR coated elements: 1GW/cm²@ 1064nm 10ns 10Hz