Gallium Arsenide (GaAs) is nearly as hard , strong and dense as Ge. GaAs is particularly useful in applications where toughness and durability are important. It has a low absorption coefficient of 0.01 cm-1 from 2.5 to 12 um .
We fabricate high precision infrared optics for surveillance, reconnaissance, and CO2 laser (transmission windows and lenses). Focusing on stringently-controlled fabrication processes that minimize surface damage, we can provide high performance, cost-effective fabrication on GaAs products. .
We offer typical available coatings for GaAs include a BBAR for 3 to 5μm spectral region, and a BBAR for the 8 to 12μm spectral region. Many other specialized bands are possible within the 2 to 15μm spectral region.
Optical grade Gallium Arsenide(GaAs) is an infrared transmitting, semi-insulating material. Gallium Arsenide is nearly as hard, strong and dense as Germanium. GaAs 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 used in some far infrared applications where its refractive index, light weight and relative strength, compared with some other IR materials, can be of benefit. It is best used in applications where durability is important as it is a very tough material so has high resistance to scratching and abrasion. Semi-insulating GaAs provides an alternative to ZnSe in medium and high-power CW CO2 laser systems for lenses and rear mirrors.
GaAs is non-hygroscopic and chemically stable except when contacted with strong acids. Since it is a toxic material, processing and handling are subject to strict procedures.
OPTICAL PROPERTIES
Bulk Absorption @ 10.33μm <0.01 cm-1
Reflection Loss at 10.33μm (Two surfaces) 44%
Refractive Index at 10.33μm 3.727
Temperature change in Refractive Index (dn/dT) 14.7 x 10-3 K-1
THERMAL PROPERTIES
Thermal Conductivity at 20°C 48 W m-1 K-1 at 273K
Specific Heat 360 J Kg-1 K-1
Thermal Expansion 5.7 x 10-6 K-1 at 300K
MECHANICAL PROPERTIES
Youngs Modulus 84.8 GPa
Rupture Modulus 7.34 MPa
Shear Modulus 32.85 GPa
Knoop Hardness 750 kgf mm-1
Poisson Ratio 0.31
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