Patent ID: 7876794

Claim:
A laser light source for implementing pulsed oscillation of laser light, comprising: a laser cavity in which a laser medium for generating emitted light with supply of excitation energy is placed on a resonance path; an exciting unit for continuously supplying excitation energy to the laser medium; a Q-switch unit located at a point of the laser cavity for modulating a cavity loss of the laser cavity; a monitor part for monitoring a power of light output from the Q-switch unit; and a control part for performing such control as to stabilize at least one of a peak power and an energy of laser light pulses outputted in a state in which the cavity loss of the laser cavity is set at a second predetermined loss for oscillation of high-power pulses, based on a power of emitted light monitored by the monitor part in a state in which the cavity loss of the laser cavity is set at a first predetermined loss for non-oscillation of high-power pulses, wherein the first predetermined loss is different from the second predetermined loss, wherein the control part controls the magnitude of the excitation energy supplied from the exciting unit based on the power of emitted light monitor part, thereby stabilizing at least one of the peak power and the energy of the output laser light.