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GGG Crystal Substrates

Gadolinium Gallium Garnet (GGG, Gd3Ga5O12) is a magneto-optical and microwave substrate. It is the best substrate material for infrared optical isolator (1.3 and 1.5um), which is a very important device in optical communication.

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Product Details

Description

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.

Features

good optical, mechanical and thermal properties;

best substrate for infrared optical isolator;

good substrate for microwave isolator;

Applications

GGG substrate

GGG led

Main Specification

Materials

GGG

Orientation

[001] or [100] or [111] < ±0.5°

Parallel

10〞

Perpendicular

surface Quality

10/5

Wavefront Distortion

λ/4 @632nm

Surface Flatness

λ/8 @632nm

Clear Aperture

>95%

Chamfer

<0.1×45°

Thickness/Diameter Tolerance

±0.05 mm

Maximum dimensions

dia 50×100mm

Coatings

AR/AR@940+1030;HR@1030+HT@940+AR1030;

Material characteristics

Physical and chemicalcharacteristics

Chemical formula

Gd3Ga5O12

Crystal structure

cubic

Lattice parameters, Å

a = 12.383 Å  

Molecular Weight  

1012.5

Density, g/cm3

7.08 g/cm3  

Transmission Range  

0.40 ~ 7.0 µm  

Refractive index

1.97 @480nm,   

Melting Point  

1730°C    

Thermal conductivity at 25°C, W x cm-1 x °K-1

7.05

Thermal expansion coefficient

8.2×10-6 /K  

Dielectric Constant  

30

Dielectric loss tangent, at 10 GHz

0.15

Colour

Colorless

Standard product

Orientation

End configuration, nm

Thickness, nm

Refractive index

[0 0 1]

10×10

0.5

1.97 @ 480nm
1.96 @ 633nm
1.95 @ 1064nm

[1 1 0]

[1 1 1]

[0 0 1]

dia 18

3.3

[1 1 0]

[1 1 1]

[0 0 1]

dia 20

1

[1 1 0]

[1 1 1]

[0 0 1]

dia 25.4

0.5

[1 1 0]

[1 1 1]

[0 0 1]

1

[1 1 0]

[1 1 1]


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