The laser beam drills by focusing the energy of {HEAD ~ the laser} onto {TAIL ~ the substrate material} 18 to vaporize or melt the substrate to form a blind hole, or well 
onto
The laser beam drills by focusing the energy of { HEAD ~ the laser } onto { TAIL ~ the substrate material } 18 to vaporize or melt the substrate to form a blind hole , or well
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH