Germanium windows, Germanium lenses

Alkor Technologies - manufacturer of Germanium windows and Germanium lenses for Thermal Imaging and Pyrometry.

• Germanium windows catalog and custom Ge windows;
  
• Germanium lenses catalog and custom Ge lenses;
  
• Germanium Optics with DLC or AR coating;
  
• Bandpass filters (filters on Ge substrate).

Alkor is one of the largest Russian manufacturer of Germanium optics with 20 years experience. Germanium windows and lenses by Alkor are widely used in IR sensors, LIDARs, Thermal Imaging Cameras and medical applications, in pyrometry, FLIR cameras all over the world.

Germanium transmission. Window thickness 10mm.

Germanium is used widely for lenses and windows in thermal imaging and FLIR applications. Its high index of refraction (about 4) makes it of particular interest. Useful transmission range of Germanium windows is from 2 to 13mkm. Germanium is opaque in the visible. Germanium has the property of thermal runaway, meaning that the transmission decreases as temperature increases. As such, Germanium window should be used at temperatures below 100°C. The Knoop Hardness of Germanium (780) is approximately twice that of Magnesium Fluoride, making it ideal for IR applications requiring rugged optics. Germanium’s high density (5.33 g/cm^3) should be considered when designing for weight-sensitive systems.

Material characteristics measured at the producer
Parameters	Mono	Poly	Method of measurement
Orientation	[111] +/-2o	-	GOST 16153, ASTM F 26 X-Ray Diffraction
Conductivity	N	N	GOST 16153, ASTM F 42 Hot-Probe method
Dopant	Sb	Sb	-
Resistivity *), Ohm*cm	standard 5-40, other as agreed	standard 5-40, other as agreed	GOST 24392, ASTM F 43 Four-Probe, Two-Probe
Transmission	46% min in the range =3-10 m through polished sample, 10 mm thick		FTIR-Spectrometry ASTM F 120