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