OPTICS CRYSTALS LASERS
   
 
Material 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.







BASE PROPERTIES

PARAMETER VALUE
OPTICAL  
  Useful Transmission Range, µm   1 - 11  
  Reflection Losses, % for 2 surfaces at 12 µm   43.8  
  Index of Absorption, 1/cm at 10.6 µm   <0.02  
     
PHSYCAL  
  Density, g/cm3 at 300 K   5.32  
  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  
  Knoop Hardness, kg/mm2   731  
  Debye Temperature, K   360  
  Specific Heat, cal/(g K) at 273 K   0.076  
  Dielectric Constant at 300 K, static   12.85  
  Dielectric Constant at 300 K, high frequency   10.88  
  Bandgap, eV   1.4  
  Young's Modulus, GPa   82.68  
  Bulk Modulus, GPa   75.5  
  Poisson Ratio   0.31  
CHEMICAL  
  Solubility in water   none  
  Molecular Weight   144.63  

REFRACTIVE INDEX

  Wavelength, µm

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  



 
 
   
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