{TAIL ~ This laser beam d} causes {HEAD ~ the optical resonance action} to greatly change the emission level of the laser beam source 1 
{ TAIL ~ This laser beam d } causes { HEAD ~ the optical resonance action } to greatly change the emission level of the laser beam source 1
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH