光学

锗 Ge)

锗具高折射率 优异硬度的独特特性,可构建出耐用、低功耗的成像和激光系统,同时最大限度地减少元器件数量。

Germanium (Ge) is ideal for applications where ruggedness and durability are important, and Ge optics can withstand optical powers in the range of 50-100 watts. Its high refractive index enables its use as a beamsplitter without additional coating.

Germanium (Ge) Characteristics

Coherent supplies Ge substrates of up to 150 mm diameter, and carefully monitors 10.6 µm absorptivity to ensure that thermal runaway and fracture do not occur.

Ge Material Properties

物理性质

杨氏模量

100 GPa(12.04 × 10⁶ psi)

断裂模量

93 MPa (20,000 psi)

努普硬度

692 kkg/mm²

密度

5.32 克/立方厘米

泊松比

0.27

热学性能

导热率 20°C

0.59 W/cm/°C

比热

0.31 J/g/°C

20°C 下的线膨胀系数

5.7 × 10⁻⁶/°C

光学性能

Bulk Absorption @ 10.6 μm

<0.03 cm-1

Temperature Change of Refractive Index @ 10.6µm

408 × 10⁻⁶/°C