Patent ID: 8867113

Claim:
A laser processing device, which is a device configured to process a processing object by condensing and irradiating laser light to the processing object, comprising: a laser light source configured to output laser light; a phase modulating spatial light modulator configured to be input with the laser light, present a hologram configured to modulate the phase of the laser light in each of a plurality of two-dimensionally arrayed pixels, and output the phase-modulated laser light; a condensing optical system provided at a subsequent stage of the spatial light modulator; and a control section configured to cause the spatial light modulator to present the hologram configured to condense the phase-modulated laser light to a plurality of condensing positions by the condensing optical system, the control section causing the spatial light modulator to present holograms such that a part of the phase-modulated laser light to be condensed at condensing positions in a processing region of the processing object is laser light having constant intensity not less than a predetermined threshold, and a remaining part of the phase-modulated laser light to be condensed at condensing positions in a non-processing region of the processing object is a plurality of laser lights having intensity more than 0 and less than the threshold, thereby processing the processing object, wherein the predetermined intensity is enough to process the processing object.