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Description

Germanium (Ge) Window is an optical component made of high-purity single-crystal germanium material. It features excellent transmission in the mid-infrared (MIR) band, high refractive index, and good mechanical stability. Usually processed with anti-reflective (AR) coatings to enhance transmission efficiency, it is widely used as a window or substrate in infrared optical systems.

Custom Optical Germanium Window Ge Infrared Protective windows with AR/DLC Coating

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Specifications

Substrate Material: Ge
Diameter (or Largest Dimension): 20 mm
Thickness: 2 mm
Antireflection Coating: Coated
Surface Quality (Scratch-Dig): 60-40
Surface Flatness: <= Lambda/4
Dimension Tolerance: +0/-0.1mm
Parallelism: <3 arcmin
Bevel: 0.1~0.3mm x 45 degree
Clear Aperture: >90%

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Features

  • Low Optical Loss: Uncoated germanium has moderate surface reflection, while broadband anti-reflection (AR) coatings specifically designed for MIR wavelengths further reduce reflectance for enhanced light throughput
  • Precision Manufacturing: Crafted with high surface flatness, superior surface quality, and tight parallelism to ensure minimal beam distortion in infrared optical systems
  • Targeted Performance: Delivers reliable MIR performance at a competitive price point, outperforming visible-range alternatives for infrared-specific applications such as thermal imaging and spectroscopy
  • Easy Integration: Compatible with standard optical mounting accessories and stress-free retaining solutions, facilitating secure and convenient installation into existing infrared systems
  • Balanced Durability: Boasts moderate mechanical strength and chemical stability, well-suited for the demands of routine laboratory, industrial, and even aerospace operating environments

Applications

  • Scientific Research & Laboratory: Used in infrared spectrometers, interferometers, and Fourier-transform infrared (FTIR) setups to shield sensitive MIR components while maintaining beam integrity for high-precision measurements
  • Thermal Imaging & Infrared Systems: Ideal for thermal cameras, night-vision devices, and infrared camera windows, providing clear transmission in the MIR band for temperature detection and thermal mapping
  • Industrial Automation & Sensing: Applied in infrared temperature sensors, gas analyzers, and process monitoring equipment to protect optics from dust/humidity without degrading infrared signal quality
  • Military & Aerospace: Integrated into infrared targeting systems, missile guidance, and satellite-borne infrared sensors, relying on Ge’s MIR transparency and mechanical stability in harsh environments
  • Laser Systems: Used in mid-infrared laser cavities, beam delivery systems, and free-space optical communication setups, with AR-coated versions minimizing energy loss in high-power MIR laser applications

Frequently Asked Questions

Can germanium windows be used in outdoor or harsh environments?
Yes, germanium has good mechanical strength and chemical stability. With proper MIR anti-reflective and protective coatings, they can be used in industrial and aerospace environments.
What shapes of germanium windows can UM Optics customize？
UM Optics can customize germanium windows in round, rectangular, wedge, round-drilled, and rectangular-drilled shapes.
How does germanium compare to other infrared window materials (e.g., ZnSe, Si)?
Germanium offers higher refractive index and better thermal conductivity than zinc selenide (ZnSe), and is more transparent in the 8–12 μm band than silicon (Si). It is a cost-effective choice for mid-infrared applications requiring high performance and mechanical stability.

Got more questions? Use the inquiry form to ask the supplier directly.

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