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