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