The magneto-optical crystal Terbium Gallium Garnet TGG is an optimum material for Faraday devices (Rotator and Isolator) in the range from 400 nm-1100 nm, excluding 470-500 nm. 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.
Main properties: Chemical formula Tb3Ga5O12
Lattice parameter a=12.355Å
Density 7.13g/cm3
Mohs hardness 8.0
Melting point 1725°C
Refractive index 1.954 at 1064 nm
Thermal conductivity 7.4 W cm-1 K-1
Verdet constant, rad x T-1 x m-1
λ = 632 nm 134
λ = 1064 nm 40
Nonlinear index, n 8.0
Figure of Merit, V/a 27
Figure of Merit, V/n2 5
