光学

砷化镓 GaAs)

光学元件 机械硬度、机械强度和耐磨性至关重要的光学元件 ,应选用砷化镓(GaAs)作为透射型和反射型光学元件 。

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.

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

物理性质

杨氏模量

83 GPa (12.04 x 106 psi)

断裂模量

138 MPa (20,000 psi)

努普硬度

750 kkg/mm²

密度

5.37 g/cm³

泊松比

0.31

热学性能

导热率 20°C

0.167 W/cm/°C

比热

0.469 J/g/°C

20°C 下的线膨胀系数

6.8 × 10⁻⁶/°C

光学性能

Bulk Absorption @ 10.6 μm

<0.01 cm-1

Temperature Change of Refractive Index @ 10.6µm

149 × 10⁻⁶/°C