Germanium for optics

Material: Germanium for IR optics.

Form of product:

- cylindrical (rods, plano blanks, windows);

- rectangular (blanks, windows)

- other (spherical generated blanks, with elements of aspheric).

Package: Termal package (vacuum sealing), then put into a wooden case or cartoon box.

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Index of refraction

4.0048±0.0002 at 10.6 μm at 25ºC

Inhomogeneity of the index of refraction

≤ 2·10-4

Temperature coefficient of the index of refraction

≤ 4·10-4

Absorption coefficient, cm-1 

0.03 см-1 max on λ= 10.6 μm under t=25ºC

Transmission

46% min at 4 μm,  45% min at 10.6 μm trough polished uncoated blank of 10 mm thickness

Crystalline form

Monocrystalline; polycrystalline

Purity

≥ 99.999%

Resistivity, Ohm•cm

 

1÷5; 5÷40

Orientation 

[111] ± 2º; [100] ± 2º

Conductivity Type

N

parameter sizes tolerances
Diameter, mm

10÷100 mm

100÷200 mm

200÷400 mm

0.05 mm

0.1 mm

0.2 mm

 

 

Maximum diameter sizes, mm:

monocrystalline

                                polycrystalline

 

 

 

320 mm

440 mm
Thickness, sag, length and width, mm

10÷100

100÷200

200÷400

0.05

0.1

0.15

Chamfer 0.1÷0.8 ±0.1 for diameter < 100mm

Surface finish, Ra, μm

 

Generated blanks

Plano blanks

 

≤ 1.5; ≤ 1.0; ≤ 0.5 μm 

≤ 2.0; ≤ 1.5; ≤ 1.0 μm 
Edge chips, mm < 0.5 mm
ETV, mm

10÷100

100÷200

200÷400

0.03

0.05

0.1

Note:

Special requirements, tighter tolerances, other remarks, which are not included into above specification upon request.