What are the specifications of a Germanium (Ge) 2-5 IR Lens?


Description
: A high efficiency, non-thorium anti-reflectance coating with moderate durability for germanium optics, providing excellent transmittance in the 2-5µm spectral band.

Application: Thermal imaging systems & FLIR systems.

Spectral Performance
: The following spectral transmittance value is based on coating both sides of a 1mm thick Germanium substrate with Ge 2-5.

Spectral Performance: @ 2-5µm
Transmission: 96% average
Reflection: 2% 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.

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