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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

 Tb3Ga5O12

  Lattice Parameter

 a=12.355

  Growth Method

 Czocralski

  Verdet Constant

 0.12min/Oe.cm at 1064nm

  Refractive Index

 1.954 at 1064nm

  Density

 7.13g/cm3

  Mohs Hardness

 8

  Melting Point

 1725

  Thermal Conductivity

 7.2Wm-1K-1

  Absorption Coefficient

 0.0015cm-1

 

TGG Crystal Product Specifications:


  Orientation

 [111] or [100] within 5 degrees

  Wavefront Distortion

 < λ/8 wave @633nm

  Extinction Ratio

 > 30dB

  Diameter Tolerance

 +0.00mm/-0.05mm

  Length Tolerance

 ±0.2mm

  Chamfer

 0.2mm @45o

  Flatness

 < λ/10 wave at 633nm

  Parallelism

 < 1 arc min

  Perpendicularity

 < 5 arc min

  Surface Quality

 10/5 Scratch/Dig (MIL-O13830A)

  AR coating

 < 0.2% @ 1064nm