Germanium

Ge single-crystal isa kind of chemical inert material, whose transmitted spectrum range is 2--12µm.It is a kind of common infrared optical material, which is high in hardness,excellent in thermal conductivity, insoluble in water, etc. It is widely usedin infrared imaging system and infrared spectrometer system.

Change ofrefractive index along with wavelength

Wavelength (nm)

Refractive index (n)

Wavelength

Refractive index

2200

4.0879

8000

4.0057

3000

4.0451

9000

4.0040

3800

4.0267

10600

4.0028

5000

4.0160

11000

4.0025

6000

4.0107

12000

4.0021

7000

4.0079

13000

4.0018

Technical requirement

Tolerance range

Size range

1-400mm

Size tolerance

+0/-0.05mm

Angle tolerance

±2”-±5’´

Surface quality

40/20

Surface accuracy

λ/10 per @633nm

Beveling

0.1-0.5mm

Material

ZnSe

Coating film

8-14micrometers or 3-5 micrometers etc, band

 

 

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