Applications  Faraday Rotators and Isolators
Advantages
TGG has twice the Verdet constant of a terbium-doped glass.
The thermal conductivity of crystalline TGG is an order of magnitude greater than a typical glass.
Optical losses are lower for TGG than Tb-doped glasses.
The combination of the above factors make TGG better suited to high average power applications. The principal limiting factor is thermally induced beam distortion. Beam distortion is less for TGG than Tb-doped glasses under the same power loading level.

Material Properties
Formula  Tb3Ga5O12
Crystal Structure  [111]
Extinction Ratio  30 dB(over 2/3 clear aperture)
Verdet Constant (632 nm)  -134 RadT-1m-1
Verdet Constant (1064 nm)  -40 RadT-1m-1
Thermal Conductivity   7.4 W cm-1 K-1
Refractive Index   1.95
Nonlinear Index, n2   8
Figure of Merit, V/a   27
Figure of Merit, V/n2   5

Tolerances
Wavefront Distortion (per inch of rod length)  l/8
Diameter  +0.000" / -0.002"
Length  +0.010" / -0.010"
Chamfer    0.005" ?0.003"at 45??5?
Flatness    Parallelism   <1 arc minute
Perpendicularity  <10 arc minutes  
Surface Quality   10-5 Scratch-Dig   (per MIL-O-1380A)
AR Coating Reflectivity     <0.25% @1064nm
Coating Adhesion/Durability  Meets MIL-C48497A
Barrel Finish (10-6 inches)  55 ?5