{HEAD ~ A cw HeNe laser beam} is reflected from {TAIL ~ a dichroic} which is coated to be near 100% reflected at HeNe frequencies 
is reflected from
{ HEAD ~ A cw HeNe laser beam } is reflected from { TAIL ~ a dichroic } which is coated to be near 100 % reflected at HeNe frequencies
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH