A method in accordance 8, wherein said center wavelength varies less than 0.05 nm over {HEAD ~ a temperature range} of {TAIL ~ 20°} to 90° C 
A method in accordance 8 , wherein said center wavelength varies less than 0.05 nm over { HEAD ~ a temperature range } of { TAIL ~ 20 ° } to 90 ° C
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH