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