What are the specifications of Germanium (Ge) 3-5 DLC IR Lens?

Description: An extremely durable anti-reflectance coating for Germanium optics, providing good transmittance in the 3-5µm spectral band.

Application: Thermal imaging systems & FLIR systems operating in very harsh environments.

Spectral Performance: The following spectral transmittance is based on coating one side of a 1mm-thick Germanium substrate with Ge 3-5 DLC and the other with a high efficient A/R Ge 3-5.

Spectral Performance: @ 3-5µm
Transmission: 94% average
Reflection: 4% average per surface

Environmental Performance: The coating passes the following environmental tests specified in MIL-F-48616 & MIL-C-48497:


Adhesion: Cellophane tape removal test.
Humidity: 95% to 100% relative humidity @ 120°F (49°C) for a duration of 24 hours.
Abrasion: Moderate (No sign of deterioration such as scratches or streaks when abraded with a dry, clean cheesecloth pad).

Temperature: -80°F to +160°F (26°C to 71°C) for 2 hours at each temperature.

The coating performance specified herein is typical of this particular coating and does not preclude adherence to other specifications on a case by case basis.

Please call (603) 757-0070 or email us with your specific requirements.