China Gadolinium gallium garnet company
Gadolinium gallium garnet company
garnet company


Gadolinium gallium garnet (GGG) is a special substrate for magneto-optical thin films because of its excellent physical, mechanical and chemical stability.

Product Description

In optical communication equipment, 1.3 μ And 1.5 μ The core part of the optical isolator is YIG or big film placed in magnetic field. The GGG single crystal substrates with different tangential directions can match the crystal lattice of this kind of magneto-optical materials, so as to ensure the successful epitaxial growth of YIG and big films.

In the field of magnetic refrigeration, GGG Crystal has been successfully used in the temperature range below 20K for market he Ⅱ flow and pre stage refrigeration of helium nitrogen liquefaction.

Main Advantages:

Low optical losses (<0.1%/cm)

High thermal conductivity (7.4W m-1K-1)

High laser damage threshold (>1GW/cm2)

Typical applications:

Substrate materials for YIG and BIG magneto-optical epitaxial membranes

Magnetic bubble memory storage

Magnetic refrigeration

Material Properties

Chemical FormulaGd3Ga5O12
Crystal StructureCubic
Lattice Constanta=12.383 Å
Growth MethodCzochralski
Melting Point1725℃
Refractive Index1.954 @ 1064nm

Technical Parameter

Crystro offers

DimensionsMax Diameter 101.6mm (4 inch)
Thickness0.5mm Other thickness upon request
PolishingSingle or double sides polishing
Orientation Flat2°(within 1° for special requirement)
RaRa≤1nm, EPI ready
Angle of CrystallineSpecial size and orientation are available upon request
Note: Above parameters for reference only, please contact our sales Rep. for your specific requirement.


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