Ge window for 8-12 um IR imager
Application: to be installed at helicopter for long-distanse monitoring of forest fire
Specification:
Material
Ge
Type
plano-plano window
Diameter, mm
120 (+0/-0.2)
Thickness, mm
4 (+/-0.2)
Surface quality, scr/dig
60/40
Surface figure, fringes
N<=5, delta N<=1 @633nm
AR coating (DLC/BBAR type),
R @8-12um, %<5 (see the curve below)
Fig. 2. Transmission spectra of Germanium windows for 8-12 um IR imager.