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