{HEAD ~ A laser system} using a cw HeNe laser for transmitting a beam through a dioic into {TAIL ~ an unstable resonator} 
{ HEAD ~ A laser system } using a cw HeNe laser for transmitting a beam through a dioic into { TAIL ~ an unstable resonator }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL