Fiber laser beam processing apparatus

A fiber laser beam processing apparatus comprising:

• an optical fiber for oscillation including
• a core containing a luminous element, and
• a clad surrounding the core;
• an pumping unit to supply the core of the optical fiber for oscillation with an excitation beam;
• a power source unit that turns on and drives the pumping unit to cause the optical fiber for oscillation to oscillate and output a laser beam having a predetermined wavelength;
• a laser beam irradiating unit that condenses and applies the laser beam generated by the optical fiber for oscillation onto a processing point on a work to be machined;
• a setting unit that sets a desired reference value or a desired reference waveform for a laser output of the laser beam;
• a laser output measuring unit that measures the laser output of the laser beam oscillated and outputted by the optical fiber for oscillation;
• and
• a controlling unit that controls the power source unit such that a laser output measured value obtained from the laser output measuring unit equals the reference value or the reference waveform.