Laser processing device and laser processing method using same

A laser processing device, comprising at least:

• a laser oscillator that generates laser light;
• an optical fiber that includes at least a core, a first cladding provided coaxially with the core on an outer peripheral side of the core, and a second cladding provided coaxially with the core on an outer peripheral side of the first cladding, and includes an incident end face and an emission end opposite to the incident end face;
• a beam control mechanism that is provided in the laser oscillator, introduces the laser light into the incident end face of the optical fiber, and controls a power distribution of the laser light emitted from the emission end of the optical fiber;
• and
• a laser light emitting head that is attached to the emission end of the optical fiber and illuminates the laser light to a workpiece, wherein
• the beam control mechanism includes at least
• a condenser lens that receives the laser light and condenses the laser light at a predetermined magnification,
• an optical path changing and holding mechanism that is disposed on an optical path of the laser light between the condenser lens and the incident end face of the optical fiber, and changes and holds the optical path of the laser light, and
• a controller that controls an operation of the optical path changing and holding mechanism, and
• the beam control mechanism controls the power distribution of the laser light emitted from the laser light emitting head by changing an incident position of the laser light on the incident end face of the optical fiber.