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Germanium lens
Germanium lens
Germanium lens


 
 

    The transmission wavelength for Monocrystal Germanium is 2-12um, it is a common infrared crystal which is widely used for infrared image system and infrared spectrograph systems. Ge has a small absorbency at 10.6um. It is a good material for CO2 lens and windows

Optical Properties

Transmission Wavelength

2000nm—12000nm

 

Absorptivity  (1/cm)

1.3*10-3 @ 3800nm

3*10-2 @ 10600nm

Thermo-optical coeffecient  ,dn/dT (1/k)

4.08*10-4 @10600nm

 

Refractive index range(20℃)

Wavelength(nm)

Refractive index(n)

Wavelength(nm)

Refractive index(n)

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


Manufacture Specifications
 

Diameter

3mm to 280mm

Diameter Tol.

+/-0.1

Surface Quality

40-20 standard

Surface Quality

40/20

Flatness 

1/4 lambda

Chamfer

0.25mmx45degree

Focal Length Tol.

+/-1%

Coating

Customer design

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