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