An LC based optical device compensates for {TAIL ~ differences} in optical path lengths of {HEAD ~ polarization components} of input beam 
An LC based optical device compensates for { TAIL ~ differences } in optical path lengths of { HEAD ~ polarization components } of input beam
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH