Almaz Optics, Inc.
12 Chadsford Ct.  Marlton, NJ 08053, USA
Tel:  856 797-0491, Fax: 856 797-0228
e-mail: mail@almazoptics.com

 

































GALLIUM ARSENIDE, GaAs

Gallium Arsenide used for lenses and beam splitters provides an alternative to ZnSe in medium and high power CW CO2 laser systems. It is most useful in applications where toughness and durability are important. Its hardness and strength make it a good choice where dust or abrasive particles tend to build up on or bombard the optical surfaces. When frequent cleaning by wiping is required, GaAs is excellent. The material is nonhygroscopic, safe to use in laboratory and field conditions and is chemically stable except when in contact with strong acids.
Maximum standard diameter is 4", sizes up to 150 mm diameter x 30 mm thickness are available on request.




Main Properties

Chemical Formula GaAs
Molecular Weight 144.63
Density, g/cm3 at 300 K 5.32
Absorption Coefficient, 1/cm at 10.6 Ám <0.02
Useful Transmission Range, Ám 1-11
Reflection Losses, % for 2 surfaces at 12 Ám 45
Dielectric Constant at 300 K, high frequency 10.88
Dielectric Constant at 300 K, static 12.85
Melting Point, K 1511
Thermal Conductivity, W/(m K) at 300 K 55
Thermal Expansion, 1/K at 300 K 5.7 x 10-6
Specific Heat, cal/(g K) at 273 K 0.076
Debye Temperature, K 360
Knoop Hardness, kg/mm2 731
Young's Modulus, GPa 82.68
Bulk Modulus, GPa 75.5
Poisson Ratio 0.31
Bandgap, eV 1.4
Solubility in water None

Refractive Index

Wavelength, Ám 8.0 10.0 11.0 13.0 13.7 14.5 15.0 17.0 19.0 21.9
Refractive Index 3.34 3.13 3.04 2.97 2.89 2.82 2.73 2.59 2.41 2.12