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