A quarter wave plate 202 and the polarization beam splitter 203 splits {HEAD ~ the composite light beam} to {TAIL ~ two separate light beams} as a function of the handedness of the circularly polarized light 
to
A quarter wave plate 202 and the polarization beam splitter 203 splits { HEAD ~ the composite light beam } to { TAIL ~ two separate light beams } as a function of the handedness of the circularly polarized light
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH