Patent ID: 7791001

Claim:
A laser processing apparatus adapted to irradiate a workpiece with a processing laser beam to process the workpiece, the laser processing apparatus comprising: a first optical system configured to emit a focus adjusting laser beam to a laser beam receiving surface of the workpiece, and to provide light paths of a plurality of light fluxes as the focus adjusting laser beam where the plurality of light fluxes are simultaneously positioned around an optical axis of the first optical system when the laser beam is incident on the laser beam receiving surface; a second optical system configured to guide the plurality of light fluxes reflected from the laser beam receiving surface to a photo-sensitive unit that detects the reflected plurality of light fluxes; a third optical system configured to irradiate the laser beam receiving surface of the workpiece with the processing laser beam; a fourth optical system configured to observe the laser beam receiving surface; an objective lens shared by the first optical system, the second optical system, the third optical system, and the fourth optical system, and located to face the laser beam receiving surface; and an output unit configured to output information relating to beam-condensing conditions of the plurality of light fluxes condensed on the laser beam receiving surface, based on the plurality of light fluxes reflected from the laser beam receiving surface and detected by the photo-sensitive unit.