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TGG Crystal

TGG CrystalTGG (Terbium Gallium Garnet) is an excellent magneto-optical crystal used in various Faraday devices (Rotator and Isolator) in the range of 400-1100nm, excluding 470-500nm. The faraday rotator is made up of TGG crystal bars and a special designed magnet. TGG is the most suitable material for Faraday devices. It is widely used for YAG lasers and Ti:sapphire tunable lasers, ring lasers, and seed injected lasers.

TGG Crystal Features: 

- Large Verdet Constant

- Low optical losses

- High thermal conductivity

- High laser damage threshold

TGG Crystal Properties

  Chemical Formula


  Lattice Parameter


  Growth Method


  Verdet Constant

 0.12min/Oe.cm at 1064nm

  Refractive Index

 1.954 at 1064nm



  Mohs Hardness


  Melting Point


  Thermal Conductivity


  Absorption Coefficient



TGG Crystal Product Specifications:


 [111] or [100] within 5 degrees

  Wavefront Distortion

 < λ/8 wave @633nm

  Extinction Ratio

 > 30dB

  Diameter Tolerance


  Length Tolerance



 0.2mm @45o


 < λ/10 wave at 633nm


 < 1 arc min


 < 5 arc min

  Surface Quality

 10/5 Scratch/Dig (MIL-O13830A)

  AR coating

 < 0.2% @ 1064nm