A laser beam 16 is focused through the opening 13 by a lens 14 and on to a panel of {HEAD ~ substrate material} 18 positioned underneath {TAIL ~ the opening} 13 
positioned underneath
A laser beam 16 is focused through the opening 13 by a lens 14 and on to a panel of { HEAD ~ substrate material } 18 positioned underneath { TAIL ~ the opening } 13
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH