GGG Substrate
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
1 ) Small dielectric constant
2 ) Small microwave band loss
3 ) Stable physical performance
Applications
1 ) Magneto-optical films
2 ) High–temperature superconductors substrate
3 ) Infrared optical isolator
Specifications
Materials | Gd3Ga5O12 (GGG) |
Orientation | [100] or [110] or [111] < ±0.5° |
Surface Finish | Single side polished (SSP) or Double sides polished (DSP) |
Polished Side Roughness | < 0.5 nm |
Typical Size | 10 x 10 x 0.5 mm, φ50.8 x 0.5 mm etc. |
Dimension Tolerance | ±0.1 mm or better |
Thickness Tolerance | ±0.05 mm or better |
Maximum Size | Diameter 2 inches |
Properties
Chemical Formula | Gd3Ga5O12 |
Growth Method | Czochralski method |
Crystal Structure | Cubic |
Lattice Parameters | a = 12.37 Å (Z=8) |
Crystal Purity | 99.95% |
Melting Point | 1860 ℃ |
Density | 7.05 g/cm3 |
Hardness | 6~7 Mohs |
Index of Refraction | 1.95 |