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