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Home > New Products > Infrared Anti-reflection and Diamond-Like Carbon (DLC) Coated Germanium Windows

Germanium Windows with Infrared Antireflection and Diamond-like Carbon (DLC) Coating

  • Infrared grade germanium single crystal
  • Precise external dimensions
  • Deeply polished optically effective surface
  • Excellent surface flatness
  • Excellent double-sided parallelism
  • Smooth protective chamfer
  • Optimized infrared optical anti-reflection coating
  • Surface hardening and diamond-like carbon coating
  • Reliable resistance to harsh environments (salt erosion, sand, rain and fog)

     In the mid-wave infrared and long-wave infrared range, germanium windows have many applications. Typical applications such as 7~14um, 8~14um infrared thermal imagers, infrared temperature measurements, etc. Due to the high refractive index of germanium, the reflectivity in these bands is relatively high, and the intrinsic transmittance of single crystal germanium is not high, optical anti-reflection coating is generally required.

How to produce high quality infrared coated germanium windows?

Creator Optics selects high-purity infrared grade germanium single crystal as the windows substrates. These preferred materials are processed into the required precise external dimensional germanium window blanks by CNC cutting machines, round grinding machines, multi-wire cutting machines and other equipment. They are then subjected to multi-step CMP to complete the precision polishing of the germanium flat window. Now, the infrared germanium window with excellent surface quality, surface flatness and double-side parallelism characteristics has been completed. However, because some specific indicators have not yet been met, they still cannot be perfectly applied in infrared systems. It is particularly important to perform subsequent surface treatments such as optical coatings on these germanium windows to achieve certain specifications.

How to make high-quality infrared coatings on these germanium windows?

First, according to the application requirements of the system or equipment, these germanium windows are designed and optimized in specific bands to achieve the best optical performance. For example, design and optimize antireflection coatings in the range of 7 microns to 14 microns. These uncoated germanium windows are then deeply cleaned and coated performed by PVD or CVD. Usually there are infrared antireflection coatings, hardened anti-reflection coatings, diamond-like carbon (DLC) coatings, etc. Therefore, this is an infrared germanium window with anti-reflection and diamond-like carbon (DLC) coating that can be applied to the assembly.

How to guarantee the performance of infrared anti-reflection and diamond-like carbon (DLC) coated germanium windows.

All infrared anti-reflection and diamond-like carbon (DLC) coated germanium windows provided by Creator Optics are strictly inspected. Certified raw material suppliers, precise measurement of geometric dimensions, microscopic inspection of surface quality, spectral measurements as well as environmental testing and so on. All of these germanium windows coated with AR and DLC coating have factory quality certification.
Specifications of Infrared Anti-reflection and Diamond-Like Carbon (DLC) Coated Germanium Windows:
Windows Dimensions Diameter from 3mm to 300mm, customized available
Windows Thickness 0.2mm to 50mm , customized available
Dimensions Tolerance +/-0.1mm +/-0.1mm
Thickness Tolerance +/-0.1mm +/-0.1mm
Windows Edge fine ground fine ground
Chamfer/Bevel 0.25x45 degrees (no-chips) 0.25x45 degrees (no-chips)
Surface Flatness 1/10 lambda per inch @10.6um 1/10 lambda per inch @10.6 um
Double-sided Parallelism 30 arc seconds 30 arc seconds
Surface Qulitity 40/20 40/20
Clear Aperture >85% >85%
Coating AR/AR coating at 7-15 microns, AR+DLC @ 7-14um, customized available
Material Infrared grade germanium monocrystal (Ge)

   * More details of general uncoated germanium windows >>>

   * Detailed characteristics of Germanium (Ge) monocrystal >>>

* Inquire about in-stock products of infrared anti-reflection and diamond-like carbon coated (DLC) germanium windows, please download the PDF inventory sheet or contact our sales engineers.

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