Patent ID: 7953126

Claim:
A fiber laser processing method of supplying a pulsed LD drive current to a laser diode to generate pulsed excitation light, using the excitation light to excite a core of an oscillation optical fiber having the core doped with a predetermined rare-earth element to generate a pulsed fiber laser beam, and focusing and applying the fiber laser beam onto a process point of a processed object to perform desired laser processing, the method comprising: controlling the LD drive current in a power feedback control mode such that the output of the fiber laser beam rises substantially from zero or a value around zero to a preceding level having no substantial effect on laser processing and arrives at a desired level for the laser processing from the preceding level after a first time period has elapsed from the start of the rising to the preceding level, wherein immediately before the output of the fiber laser beam starts rising to the preceding level, the LD drive current is controlled in a current feedback control mode for a second time period such that the current value of the LD drive current becomes identical to a current reference value.