At Avantier Inc., we take pride in offering a wide variety of Germanium lenses (Ge lenses) with various anti-reflection coatings. These coatings enhance the lenses’ performance, ensuring optimal transmission and reducing undesirable reflections in applications like thermal imaging systems and Fourier-transformed infrared (FTIR) spectroscopy.

Our Germanium lenses (Ge lenses) have a high refractive index, making them the top choice among readily available IR transmitters. This characteristic enables them to handle wide angle lenses, delivering exceptional imaging capabilities in a variety of settings, even harsh environments where constant exposure to the elements occurs. Whether you need Germanium Lenses for research, industrial, or defense applications, Avantier Inc. has the expertise and product range to meet your specific requirements.

Germanium lens
Germanium Infrared (IR) Aspheric Lens

Germanium’s unique properties are attributed to its high density, which imparts remarkable ruggedness to the lenses, making them ideal for challenging conditions. Its ability to transmit infrared light efficiently, especially in the 2-12 μm band, highlights its suitability for thermal imaging applications and other IR-sensitive tasks.

When it comes to focal lengths, our spherical plano-convex, concave-convex, and aspheric germanium lenses offer precise control, with tolerances of +/-1%. These lenses address various optical needs, from beam expansion and collimation to eliminating spherical aberration in complex optical systems.

Our germanium lenses also come with BBAR (broadband anti-reflection) coatings, which further enhance their performance, particularly in the desired wavelength range of 3-12 μm. These coatings maximize light transmission, reaching up to 95% in some cases.

Incorporating germanium transmits, which is a unique characteristic of this material, these lenses excel in mid-infrared light applications. The inclusion of AR coatings further boosts their transmission capabilities, allowing for superior image quality and clarity.

Among our offerings, plano-convex germanium lenses stand out for their utility in light collimation and focusing applications. These lenses find widespread use in diverse fields, including science, industry, and defense.

Our aspheric germanium lenses deserve special mention as they tackle the challenge of eliminating spherical aberration in optical systems, leading to simplified setups and even potential weight reduction in certain cases.

To ensure precision, our factory adheres to stringent standards for surface quality, achieving a 20-10 scratch dig rating, even after coating. This level of quality is suitable for most laser applications, guaranteeing reliable and high-performance germanium lenses for your needs.

Germanium Optics (GE Lenses) Standards

  • Substrate Material: Ge (Germanium)
  • Diameter:  5mm-350mm
  • Shape: Spherical Plano-Concave, P-Convex, Concave-Convex or Aspheric
  • Focal length: +/-1%
  • Surface Quality: 20-10 (after coating)
  • Surface figure: l/4 @ 633nm
  • Clear Aperture: >85% of central dimension
  • Antireflection Coating: @ 3-12 um

At Avantier Inc., we cater to specific requirements, offering custom sizes and coatings to meet your unique specifications. Whether you need germanium lenses for thermal imaging systems, IR transmitters, or other demanding applications, our team is dedicated to delivering the highest quality products for your projects. Please contact us if you’d like to schedule a free consultation or request for a quote on your next project.


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