Germanium Lenses - HuiQi optics

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Germanium Lenses

Germanium lenses are optical len made of polished germanium. These lenses are rugged and resistant to corrosion and are ideal for harsh environments and applications where there is constant exposure to the elements.

Germanium lenses are optical len made of polished germanium. These lenses are rugged and resistant to corrosion, and are ideal for harsh environments and applications where there is constant exposure to the elements.

Germanium Lenses Application

The single crystal of germanium used in electronic fields has less absorption in the infrared wavelength of 2 – 20μm and it can be used as an optical element of the infrared light. It is a single lens that was made with the germanium crystal. It is used as a lens of a camera to observe the infrared, such as thermography.

Even though it looks like the light does not transmit because of its metallic luster, it is transmitting through a wide infrared range of 2 – 20μm. The wavelength of 1.5μm or less does not transmit, so it also provides the effect of an infrared transmission filter. Since the silicon lens has a refractive index of 4 or more, the lens curvature is slower than when made from standard glass.

Germanium lens can have metallic luster, so that visible light is reflected and absorbed. Because of this, no transmittance occurs. Germanium lens without an anti-reflection coating has a loss due to surface reflection and results in transmittance of about 40%. For the observation of infrared wavelengths, it is necessary to consider the effect of the radiation spectrum by temperature. In case of use in an environment of 30℃ or more, radiant light of infrared (near 9.6μm) is emitted from all substances, and it will not be able to properly observe this infrared spectrum.

1. Spherical plano-concave, p-convex, concave-convex, and aspheric lenses are all available

2. Available with AR or DLC coating

3. Available in a wide variety of diameters and focal lengths

4. High resistivity hemispherical lens available

Due to their remarkable properties, germanium lenses are often used in camera lenses for infrared heat measurement，Ideal for Defense, Security, and Thermal Imaging Applications.

General Specifications

Applicable to infrared imaging monitoring telemetry and infrared spectroscopic optical system
Technical Requirement	Commercial Grade	Precision Grade	High Precision
Size range	1-600mm	2-600mm	2-600mm
Diameter tolerance	土0.1mm	土0.025mm	土0.01mm
Thickness tolerance	土0.1mm	土0.025mm	土0.01mm
Parallelism	±3´	±1´	±30´´
Surface quality	60-40	40-20	20-10
Surface accuracy	1.0λ	λ/10	λ/20
Coating	3-5μm OR 8-12μm AR, <5% per Surface
Bevelling	0.1-0.5mm*45°
Substrate	Germanium or other optical crystal

Diameter	Focal length	Radius	Center thickness	Edges thickness
16.5	20	60	1.8	1
20/25.4	25.4 mm	76.3 mm	3.1 mm	2.0 mm
20/25.4	50 mm	150.3 mm	4.0 mm	3.5 mm
20/25.4	75 mm	225.5 mm	4.0 mm	3.6 mm
20/25.4	100 mm	300.7 mm	1.8 mm	1.5 mm
20/25.4	150 mm	451.0 mm	4.0 mm	3.8 mm
20/25.4	200 mm	601.4 mm	4.0 mm	3.9 mm
20/25.4	500 mm	1501.9 mm	2.1 mm	2.0 mm
20/25.4	750 mm	2252.9 mm	2.0 mm	2.0 mm
20/25.4	1000 mm	3303.9 mm	2.0 mm	2.0 mm