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Interestingly, due to its similar crystal structure to Diamond can be coated with a DLC layer (Diamond Like Carbon) which on top of reducing the reflection on it’s surface, adds a diamond strong protective layer. Finally Germanium is not transparent in the visible which can be useful to focus on IR light.

It has good transmission in the 8 to 14 µm range covering the thermal Infrared light, therefore it is a material of choice for thermal and night vision. It also shows a high refractive index which enable high open aperture angle optical component’s design.

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Unfortunately Germanium is sensible to high temperature with degradation of its optical properties over 100°C. For high temperature Mid-IR (8-13µm) alternative we recommend using BaF2 (! much lower transmission after 11µm) or ZnSe.

Germanium glassproperties

Nov 9, 2017 — One: Anti-reflective coating on glasses cuts glare and allows more light through to your eyes. Anti-reflective coating, often referred to as AR, ...

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It is also worth noting that germanium is relatively more brittle that silicon and therefore should be handle with care during machining.

Above value are generic specifications for fabrication, specific better value may be available and need to be reviewed case by case.

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Super Achromatic Waveplates | SIMTRUM Photonics Store · QMS-SAWP-R4-20-600-2000-M - Parameter · QMS-SAWP-R4-20-380-1100-M - Parameter · QMS-SAWP-R4-20-600-2000- ...

Most of the raw material comes from China, Russia and USA being also important suppliers, quality material is available everywhere.

Germanium famously known as predicted by Mendeleev before its actual discovery in the end 19th century, is widely used in optics as a component material for IR applications.  It has also interesting semi-conductor properties that we will not discuss into details in this guide.

Germanium glasslens

Germanium optical components along with Silicon ones are made by precision optical suppliers usually focusing on IR applications. Due to high value of the material, specialization enables these companies less pressure on the stocks and lower risks of non-quality rejection.

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Raw germanium have a relatively average transmission in the IR (less than 50%) but Anti-reflect or DLC treatments do improve a lot it’s transmittance.

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IR is generally understood to include wavelengths from around 750 nm (400 THz) to 1 mm (300 GHz). ... IR is commonly divided between longer-wavelength thermal IR, ...

The lens is divided into two segments, the top of the lens contains the distance vision prescription, while the bottom of the lens contains the near vision ...

Germanium GlassPrice

Figure 1: C-mount lenses and cameras have the same flange focal distance (FFD), 17.526 mm. This ensures light through the lens focuses on the camera's sensor.

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Ge is also interesting for its low optical dispersion and therefore very low chromatic dispersion in it’s transmission spectrum.

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We believe high quality prescription lenses should be easily affordable. We commit to providing the best value anywhere on high quality replacement eyewear ...