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GaAs

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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