Patent ID: 9343865
Filing Date: 2016-05-17
CPC Classification: H01S

Claim Text:
1. A laser device comprising: an optical fiber laser unit including when an instruction value for supplying a predetermined driving electric current to each of the pumping light sources is input to the controller circuitry, the controller circuitry conducts a control of supplying a compensated electric current value as a driving electric current obtained by multiplying an initial electric current value corresponding to the instruction value by a compensation coefficient and supplying the compensated electric current value to each of the pumping light sources, the compensation coefficient is set to restrain a decrease in a power with time of a laser light output from the optical fiber laser unit, the compensation coefficient is a function of an accumulated driving time of each of the pumping light sources, the plurality of the pumping light sources is a plurality of semiconductor pump lasers, and the compensation coefficient is a function set to compensate for a decrease in a sum of powers of the pumping lights, the decrease depending on an accidental failure rate of chips of the plurality of the semiconductor pump lasers.