an irradiating optical system for {HEAD ~ focusing and irradiating light output} from {TAIL ~ the light source device} onto a processing spot within the workpiece; and 
an irradiating optical system for { HEAD ~ focusing and irradiating light output } from { TAIL ~ the light source device } onto a processing spot within the workpiece ; and
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH