光学

ゲルマニウム (Ge)

Use Germanium's unique combination of high refractive index and excellent hardness to build durable, low-power imaging and laser systems with a minimum component count.

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

物理的特性

ヤング率

100 GPa (12.04 x 106 psi)

破断弾性率

93 MPa (20,000 psi)

ヌープ硬度

692 kkg/mm²

密度

5.32 g/cm³

ポアソン比

0.27

熱特性

Thermal Conductivity @ 20° C

0.59 W/cm/°C

比熱

0.31 J/g/°C

20°Cにおける線膨張係数

5.7 x 10-6/°C

光学特性

Bulk Absorption @ 10.6 μm

<0.03 cm-1

Temperature Change of Refractive Index @ 10.6µm

408 x 10-6/°C