Germanium Lens

Avantier takes pride in producing Germanium lenses, meticulously crafted from polished germanium. These optical marvels are specifically designed to thrive in challenging environments, demonstrating exceptional resilience against corrosion. Ideal for applications constantly exposed to the elements, Germanium lenses stand out for their durability and reliability.

Germanium Lens
Germanium Lens

Germanium Lens 

Our Germanium lenses boast a range of features that set them apart. With a high refractive index, they claim the top spot among readily available IR transmitters, offering minimal chromatic aberration due to low dispersion. This makes them a preferred choice for infrared applications like FLIR and FTIR, as well as for thermal imaging systems and precision analytic instruments operating in harsh conditions. The unique ruggedness of Germanium, characterized by a Knoop hardness of 780 and a high density of 5.33 g/cm³, makes these lenses stand up to the demands of weight-sensitive systems.

Our Capabilities
Avantier’s Germanium lenses come with a suite of capabilities to meet diverse optical needs. Customization is key, with options including spherical plano-concave, p-convex, concave-convex, and aspheric lenses, catering to a variety of applications. From beam divergence and focal length increase to collimation and focusing, each lens type serves a specific purpose. The lenses also feature anti-reflection coatings, enhancing transmission up to 95%. Specifications, ranging from diameters of 5 mm to 350 mm, ensure that our lenses maintain precision with focal length tolerances of +/-1%, while surface flatness is maintained at l/4 @ 633nm. This precision, combined with a 20-10 scratch dig surface quality post-coating, positions our Germanium lenses as a reliable choice for a wide range of laser applications.

Germanium Lens
Germanium Lens

Factory Standard

Substrate Material

Ge (Germanium)




Spherical Plano-Concave, P-Convex, Concave-Convex or Aspheric

Focal length


Surface Quality

20-10 (after coating)

Surface Figure

l/4 @ 633nm

Antireflection Coating

@ 3-12 um


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