The quarter wave plate 828 converts {HEAD ~ the the components} of {TAIL ~ the composite light beam} to clockwise circularly polarized light and counterclockwise circularly polarized light, and the beam expander 829 expands the composite light beam CB4 to have a relatively large diameter 
of
The quarter wave plate 828 converts { HEAD ~ the the components } of { TAIL ~ the composite light beam } to clockwise circularly polarized light and counterclockwise circularly polarized light , and the beam expander 829 expands the composite light beam CB4 to have a relatively large diameter
OTH OTH OTH OTH OTH OTH 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH