{HEAD ~ The composite light beam} passes through the quarter wave plate 828 and the beam expander 829 and enters {TAIL ~ the light deflector unit} 804 
{ HEAD ~ The composite light beam } passes through the quarter wave plate 828 and the beam expander 829 and enters { TAIL ~ the light deflector unit } 804
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH