After {TAIL ~ the beam} is amplified by {HEAD ~ first amplifier} 76, it passes through mode matching means 66 and into second amplifying stage 78, where it is further amplified 
After { TAIL ~ the beam } is amplified by { HEAD ~ first amplifier } 76 , it passes through mode matching means 66 and into second amplifying stage 78 , where it is further amplified
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH