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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
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PARAMETER |
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VALUE |
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| OPTICAL |
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Useful Transmission Range, µm |
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1 - 11 |
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Reflection Losses, % for 2 surfaces at 12 µm |
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43.8 |
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Index of Absorption, 1/cm at 10.6 µm |
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<0.02 |
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| PHSYCAL |
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Density, g/cm3 at 300 K |
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5.32 |
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Melting Point, K |
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1511 |
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Thermal Conductivity, W/(m K) at 300 K |
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55 |
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Thermal Expansion, 1/K at 300 K |
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5.7 x 10-6 |
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Knoop Hardness, kg/mm2 |
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731 |
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Debye Temperature, K |
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360 |
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Specific Heat, cal/(g K) at 273 K |
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0.076 |
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Dielectric Constant at 300 K, static |
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12.85 |
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Dielectric Constant at 300 K, high frequency |
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10.88 |
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Bandgap, eV |
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1.4 |
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Young's Modulus, GPa |
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82.68 |
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Bulk Modulus, GPa |
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75.5 |
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Poisson Ratio |
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0.31 |
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| CHEMICAL |
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Solubility in water |
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none |
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Molecular Weight |
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144.63 |
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REFRACTIVE INDEX
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Wavelength, µm |
8.0 |
10.0 |
11.0 |
13.0 |
13.7 |
14.5 |
15.0 |
17.0 |
19.0 |
21.9 |
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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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