A method for manufacturing an infrared filter 11 wherein {HEAD ~ said coatings} are composed of {TAIL ~ either PbF2} or ThF4 
are composed of
A method for manufacturing an infrared filter 11 wherein { HEAD ~ said coatings } are composed of { TAIL ~ either PbF2 } or ThF4
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH