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Gallium Arsenide (GaAs)
Optical grade Gallium Arsenide is an infrared transmitting, semi-insulating material. Special Properties: Gallium Arsenide is nearly as hard, strong and dense as Germanium. It is commonly used in applications where toughness, and durability are of great importance. It has a low absorption coefficient of 0.01cm–1 from 2.5 to 12µm. GaAs optical grade material is generally more expensive than Germanium and ZnSe. GaAs is Diamond Turnable.
| Property |
Specification |
| Transmission Range |
2µm
to 15µm |
| Density |
5.31
g/cm3 |
| Thermal Expansion |
6 x 10-6/°K |
| Surface Finish |
Typical specifications for surface quality in the infrared are 40-20 or 60-40 scratch-dig in the 2 to 7µm spectral region & 60-40, 80-50 or 120-80 scratch-dig for the 7-15µm area, depending upon system performance requirements. |
| Surface Figure |
In the infrared, typical surface figure ranges from 1/2 wave to 2 waves @ 0.6328µm depending on the system performance requirements. |
| AR Coating Options |
Typical available coatings for GaAs include a BBAR for 3 to 5µm spectral region, & a BBAR for the 8 to 12µm spectral region. Many other specialized bands are possible within the 2 to 15µm spectral region. |
| Typical Applications |
Thermal imaging, CO2 laser systems, FLIR |
| Products Manufactured |
Lenses, Aspheric Lenses, Windows, Wedges. |
|
Wavelength (µm)
|
Index of Refraction (n)
|
|
4.0
|
3.307
|
|
10.0
|
3.278
|
|
14.0
|
3.251
|
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