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Germanium prisms


Germanium prisms specifications:



Standard precision

High-precision

Dimension Tolerance

φ5-250mm+0/-0.2

φ3-350mm+0/-0.2

Angle Tolerance

1-50mm+/-0.1

1-50mm

Surface Quality

60/40

20/10

Flatness

N<λ/2@633nm(at 50mm)

N<λ/10@633nm(at 50mm)

Clear Aperture

>90%

>95%

Chamfer

Protected <0.5mmx45deg

Protected <0.5mmx45deg






    The transmittance range of optical germanium material is 2-14um, and its refractive index is as high as 4. Germanium lens and germanium window are widely used in thermal imaging system.

    Because germanium material has high refractive index, the surface reflectivity is very high (R>30%), so optical germanium elements usually need AR coating.




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