Single Crystals Substrate

Terbium Gallium Garnet (GGG) Crystal

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Introduction:

Gadolinium gallium garnet (GGG) is a special substrate magneto optical films. In optical communication equipment, a large number of 1.3 and 1.5 micron optical isolators are needed, and the core component is YIG or BIG film placed in the magnetic field. Different tangential GGG single crystal substrates can be matched with the lattice of such magneto-optical materials, thus ensuring the successful epitaxial growth of YIG and BIG films. The good physical, mechanical and chemical stability of GGG also ensures the requirements of the substrate in the process of film preparation. The substrate material is made of microwave isolator GGG.


Main Advantages:

• 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




CRYSTRO supply GGG crystal with:

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

2.8--100 mm in diameter



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