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