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