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GGG Gadolinium Gallium Garnet

GGG, SGGG, and NGG are all used for substrate liquid epitaxial growth. GGG is a specialized substrate for laser thin films. In optical communication equipment groups, a large number of 1.3um and 1.5um optical isolators are required.

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Product Description

Its core component is YIG or BIG thin films based on magnetic fields. GGG single crystal substrates with different tangential directions can match the lattice of these kind of philanthropic materials, ensuring the successful epitaxial growth of YIG and BIG thin films, The excellent physical and mechanical properties and chemical stability of GGG ensure the various demands for the film during the preparation process. At the same time, GGG is applied in the magnetic refrigeration industry in HeII flow and helium nitriding front stage refrigeration at temperatures below 20K.

Main features

Low optical loss (<0.1% / cm)

High thermal conductivity (7.4 Wm-1K-1)

High laser damage threshold (> 1GW / cm2)

Typical applications

Substrate materials for YIG and BIG magneto-optical epitaxial films

Magnetic bubble memory

Magnetic refrigeration

Materials Properties

Material	GGG	SGGG
Molecular formula	Gd₃Ga₅O₁₂	Substituted Gd₃Ga₅O₁₂
Crystal structure	cubic system	cubic system
Lattice constant	a=12.383 Å	a=12.497 Å
Growing directions	Czochralski	Czochralski
Hardness	8.0	7.5
Density	7.13g/cm3	7.09g/cm3
Melting point	1725℃	1730℃
Reflection coefficient	1.954 @ 1064nm	1.954 @ 1064nm

Product Parameter

Crystal orientation	<111>±0.2°
Size	10 * 10 * 0.5,2 inch / 3 in
Thickness	0.5mm, or to be customized
Polishing	Single or double-sided
Positioning edge accuracy	＜2°
Surface roughness	Ra≤1nm, EPI ready