Crystals Materials
TGG Crystal for faraday devices in the range of 400 nm-1100 nm applications
  • Surface Quality: 10/5 Scratch/Dig MIL-O-1380A
  • Parallelism: < 10″
  • Perpendicularity: < 5'
  • Clear Aperture: > 90%
  • Surface Flatness: < λ/10 @ 632.8 nm
  • Coating: AR/HR/PR coating upon customer's request
  • Quality Warranty Period: One year
  • TGG crystal (Terbium Gallium Garnet, Tb3Ga5O12,) is an excellent magneto-optical crystal used in various Faraday devices (Rotators and Isolators) in the range of 400 nm-1100 nm, excluding 475 nm-500 nm.

    Specifications of TGG Crystal
    Dimension Tolerances ±0.05 mm
    Surface Quality 10/5 S/D
    Parallelism < 10 arcsec
    Perpendicularity < 5 arcmin
    Clear Aperture > 90%
    Wavefront Distortion λ/10 @ 633 nm
    Surface Flatness < λ/10 @ 632.8 nm
    Chamfer < 0.1 mm @ 45°
    Coating AR/HR/PR coating upon customer's request
    Damage Threshold 750mW/cm2 at 1064 nm, TEM00, 10 ns, 10Hz
    Physical and chemical properties
    Property Value
    Chemical Formula Tb3Ga5O12
    Lattice Parameter a=12.355Å
    Growth Method Czocralski
    Density 7.13g/cm3
    Mohs Hardness 8
    Melting Point 1725 ℃
    Refractive Index 1.954 at 1064nm
    Crystal Structure [111]
    Extinction Ratio (over 2/3 clear aperture) 30 dB
    Thermal Conductivity 7.4 W cm^-1 K^-1
    Nonlinear Index, n2 8
    Figure of Merit, V/a 27
    Figure of Merit, V/n2 5
    Verdet Constant
    Wavelength Verdet Constant
    632 nm -134 RadT^-1m^-1
    1064 nm -40 RadT^-1m^-1

    Stock specification list

    If need other specifications and quantities products, please contact us(
    Part Number Face size Length Coating
    TGG-001 Φ30.0 mm 3-20 mm AR@1064 nm
    TGG-002 10.0*10.0 mm 3-20 mm AR@1064 nm


  • Anti-reflection coatings are available at your specified wavelength.
  • Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.
  • To inquiry or order a finished TGG laser rod, please specify the specification listed above, for common application, we only need to know the main specification: sizes, and coating. For special request, please specify specification in details for evaluation and fabrication.
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