GGG
Gadolinium gallium garnet (GGG) is a special substrate for magneto-optical thin films because of its excellent physical, mechanical and chemical stability.
File Download- Product Description
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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
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Material
GGG
SGGG
Chemical Formula
Gd3Ga5O12
Substituted Gd3Ga5O12
Crystal Structure
Cubic
Cubic
Lattice Constant
a=12.383 Å
a=12.497 Å
Growth Method
Czochralski
Czochralski
Hardness
8.0
7.5
Density
7.13g/cm³
7.09g/cm³
Melting Point
1725℃
1730℃
Refractive Index
1.954 @ 1064nm
1.954 @ 1064nm
- Technical Parameter
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Crystro offers:
Dimensions
Max Diameter 101.6mm (4 inch)
Thickness
0.5mm Other thickness upon request
Polishing
Single or double sides polishing
Orientation
<111>±0.2°
Orientation Flat
2°（within 1° for special requirement）
Ra
Ra≤1nm, EPI ready
Angle of Crystalline
Special size and orientation are available upon request
Note: Above parameters for reference only, please contact our sales Rep. for your specific requirement.