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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

Diamond-Like Carbon (DLC) Coated Germanium Windows

TECHSPEC® Diamond-Like Carbon (DLC) Coated Germanium Windows

TECHSPEC® Diamond-Like Carbon (DLC) Coated Germanium Windows

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  • Meets Severe Abrasion Requirements of MIL-C-675C
  • ≥90% Transmission from 8 - 11.5µm
  • Ideal for Harsh Environments
  • Uncoated, 3-5 Micron BBAR, and 8 - 12 Micron BBAR Coated Germanium Windows are also Available
  • Due to material supply chain disruptions with germanium, there may be increased lead times and price changes on our germanium products. For more information, please contact our customer service team.
  • Edmund Optics has limited remaining inventory of this part number and no raw material available to supply more once this is depleted.  Please contact our Product Support Engineers to help with an alternate solution for your needs. Customer Service can provide you the latest price and availability.

TECHSPEC® Diamond-Like Carbon (DLC) Coated Germanium Windows have been designed with durability in mind. Featuring a high efficiency broadband anti-reflection coating on one surface and a specially designed DLC coating on the other surface, these windows feature excellent transmission and environmental resistance. The DLC coated surface is designed to withstand temperature cycling from -80 to +160°F, salt spray for a continuous period of 24 hours, salt solubility for an immersion period of 24 hours, and 5,000 wiper oscillations in a sand and slurry mixture. Further, TECHSPEC DLC Coated Germanium Windows meet the MIL-C-675C requirements for severe abrasion.

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Technical Information

Coating Specifications
Specification AR Coating DLC Coating
Adhesion per MIL-C-48497A Paragraph 4.5.3.1 per MIL-M-13508C Paragraph 4.4.6
Abrasion Moderate, per MIL-C-48497A Paragraph 4.5.3.3 Severe, per MIL-C-675C Paragraph 4.5.10
Humidity per MIL-C-48497A Paragraph 4.5.3.2 ≥24 Hours per MIL-C-675C paragraph 4.5.8
Salt Solubility - ≥24 Hours Immersion per MIL-C-675C paragraph 4.5.7
Salt Spray - ≥24 Hours per MIL-C-675C paragraph 4.5.9
Temperature (°F) -80 to +160 per MIL-C-48497A Paragraph 4.5.4.1 -80 to +160 per MIL-C-48497A Paragraph 4.5.4.1
Solubility and Cleaning per MIL-C-48497A Paragraph 4.5.4.2 -
Water Solubility 24 Hours, per MIL-C-48497A Paragraph 4.5.5.3 -
Wiper - ≥5,000 Wipes of Sand/Slurry per TS-1888

Special Handling

Germanium Optics Handling and Cleaning Guidelines

Germanium optics require special handling and cleaning procedures. Always wear gloves during handling to prevent contamination, and wash hands afterward. Avoid contact between Germanium dust and the eyes, skin, or clothing. When not in use, store optics sealed and covered at temperatures between 20°C and 25°C. Do not expose them to temperatures exceeding 100°C when in use.

Handling Guidelines

  • Always wear gloves to prevent damage from skin oils.
  • If Germanium dust is present, take the following precautions:
    • Wear safety glasses to protect eyes.
    • Use a dust mask or face mask to avoid inhalation.
    • Wear gloves to prevent skin contact.
  • Maintain storage temperature between 20°C and 25°C with humidity below 30%.
  • Wrap Germanium optics in a lens cloth or pouch and seal in a container when not in use.
  • Germanium is brittle and heavy — always place it on soft surfaces and avoid dropping it.

Approved Cleaning Solvents

  • Ethanol
  • Isopropyl Alcohol
  • Methanol
  • Reagent-Grade Acetone
  • Liquid CO₂
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Custom

Edmund Optics offers comprehensive custom manufacturing services for optical and imaging components tailored to your specific application requirements. Whether in the prototyping phase or preparing for full-scale production, we provide flexible solutions to meet your needs. Our experienced engineers are here to assist—from concept to completion.

Our capabilities include:

  • Custom dimensions, materials, coatings, and more
  • High-precision surface quality and flatness
  • Tight tolerances and complex geometries
  • Scalable production—from prototype to volume

Learn more about our custom manufacturing capabilities or submit an inquiry here.