GGG Crystals


  • Chemical Formula: Gd3Ga5O12
  • Lattic Parameter: a=12.376Å
  • Growth Method: Czochralski
  • Density: 7.13g/cm3
  • Mohs Hardness: 8.0
  • Melting Point: 1725℃
  • Refractive Index: 1.954 at 1064nm
  • Product Detail

    Technical parameters

    Gallium Gadolinium Garnet (Gd3Ga5O12 or GGG) single crystal is material with good optical, mechanical and thermal properties which make it promising for use in fabrication of various optical components as well as substrate material for magneto-optical films and high–temperature superconductors.It is the best substrate material for infrared optical isolator (1.3 and 1.5um), which is a very important device in optical communication. It is made of YIG or BIG film on the GGG substrate plus birefringence parts. Also GGG is an important substrate for microwave isolator and other devices. Its physical, mechanical and chemical properties are all good for the above applications.

    Main Applications:
    Large dimensions,from 2.8 to 76mm.
    Low optical losses (<0.1%/cm)
    High thermal conductivity (7.4W m-1K-1).
    High laser damage threshold (>1GW/cm2)

    Main Properties:

    Chemical Formula Gd3Ga5O12
    Lattic Parameter a=12.376Å
    Growth Method Czochralski
    Density  7.13g/cm3
    Mohs Hardness 8.0
    Melting Point 1725℃
    Refractive Index 1.954 at 1064nm

    Technical Parameters:

    Orientation [111] within ±15 arc min
    Wave Front Distortion <1/4 wave@632
    Diameter Tolerance ±0.05mm
    Length Tolerance ±0.2mm
    Chamfer 0.10mm@45º
    Flatness <1/10 wave at 633nm
    Parallelism < 30 arc Seconds
    Perpendicularity < 15 arc min
    Surface Quality 10/5 Scratch/Dig
    Clear Apereture >90%
    Large Dimensions of Crystals .8-76 mm in diameter