The beam then passes through {TAIL ~ mode matching means} 66 and into {HEAD ~ third amplifying state} 80, where it is amplified again 
The beam then passes through { TAIL ~ mode matching means } 66 and into { HEAD ~ third amplifying state } 80 , where it is amplified again
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH