Patent ID: 7889772

Claim:
A laser oscillator apparatus that oscillates by supplying a current to pumping means to thereby pump a laser medium, the laser apparatus comprising: current measuring means that measures a value of a current supplied to the pumping means; laser output power measuring means that measures an output power of a laser beam generated by the laser oscillator apparatus; upper limit current value determination means that determines an upper limit current value based on a laser output power command value to be input separately; command current value determination means that determines, as a command current value, a value of the current to be supplied to the pumping means, according to a difference between the laser output power command value and the measured laser output power value; a comparator that compares the command current value with the upper limit current value, to output the smaller value thereof as a reference current value; and current limiting means that compares the reference current value with the measured current value, to limit the value of the current supplied to the pumping means so that the value of the current is controlled to be the reference current value.