A filter of the type depicted in FIG 2 is suitable for {TAIL ~ infrared radiation} in the spectral range of {HEAD ~ wavelengths} from approximately 1.8 microns to 1000 microns 
A filter of the type depicted in FIG 2 is suitable for { TAIL ~ infrared radiation } in the spectral range of { HEAD ~ wavelengths } from approximately 1.8 microns to 1000 microns
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH