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    Terbium gallium garnet

    TGG single crystal is the best magneto-optical material for production of Faraday rotator and isolator, suitable wavelength of 400-1100nm (not including 470nm-500nm). Faraday rotator is by the TGG crystal bar and a specially designed magnet. The beam through TGG monocrystalline, its direction of polarization will be deflected under the magnetic field, the deflection direction is only associated with the direction of the magnetic field, regardless of the direction of beam propagation. Light isolator consists of a 45 degree deflection optical rotator and a pair of polarizers, it makes the beam through only one direction, while blocking reverse spread beam.

    Main advantages: TGG single crystal has a large magneto-optical constant, low optical loss, high thermal conductivity and high laser damage threshold, widely used in YAG, Ti-doped sapphire multi-stage amplification, ring, seeds injection lasers.

            

     

    TGG crystals parameter:

    Chemical formula:

    Tb3Ga5O12

    Lattice constants:

    a=12.355

    Growth method:

    Czochralski method.

    Density:

    7.13g/cm3

    Mohs hardness:

    8.0

    Melting point:

    1725℃

    Index of refraction:

    1.954 at 1064nm

    Thermal conductivity:

    9.410-6℃-1

    The Wei Deer constant:

    0.12min/Oe.cm at 1064nm

    Crystal standard:

    Processing indicators:

     

    Directional accuracy:

    〔111〕within 5 degrees

    Wavefront distortion:

    <λ/8 wave total

    Extinction ratio:

    A:>30dB,B:>28dB

                                              Dimensional tolerances:

    Diameter:

    0.05mm

    Length:

    0.2mm

    Chamfer:

    0.2mm at 450

                                               Other parameters:

    Flatness:

    <λ/10 wave at 633nm

    Pass gloss parallel degree:

    <1 arc minutes

    Verticality:

    <5 arc minutes

    Surface finish:

    10/5 per MIL-O13830A