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