{HEAD ~ The use} of acousto optic devices for spatially splitting beams in material processing applications is known in {TAIL ~ the art} 
is known in
{ HEAD ~ The use } of acousto optic devices for spatially splitting beams in material processing applications is known in { TAIL ~ the art }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL