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