Optics
Gallium Arsenide (GaAs)
Use GaAs for transmissive and reflective optics in applications where mechanical hardness, mechanical strength, and abrasion resistance are important.
Coherent produces GaAs with the characteristics required for optical applications by applying laser vacuum calorimetry and other techniques to screen out material with voids, inclusions, or other defects that cause inferior optical performance.
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Gallium Arsenide (GaAs) Characteristics
Coherent supplies GaAs substrates of up to 100 mm diameter, and carefully monitors 10.6 µm absorptivity to ensure that thermal runaway and fracture do not occur.
GaAs Material Properties |
|
Physical Properties |
|
Young’s Modulus |
83 GPa (12.04 x 106 psi) |
Rupture Modulus |
138 MPa (20,000 psi) |
Knoop Hardness |
750 kkg/mm² |
Density |
5.37 g/cm³ |
Poisson’s Ratio |
0.31 |
Thermal Properties |
|
Thermal Conductivity @ 20° C |
0.167 W/cm/°C |
Specific Heat |
0.469 J/g/°C |
Linear Expansion Coefficient @ 20° C |
6.8 x 10-6/°C |
Optical Properties |
|
Bulk Absorption @ 10.6 μm |
<0.01 cm-1 |
Temperature Change of Refractive Index @ 10.6µm |
149 x 10-6/°C |
