Patent ID: 8290004

Claim:
A laser light source, comprising: a first light source outputting light with a first wavelength as pulsed light; a second light source outputting light with a second wavelength different from the first wavelength; an optical amplifier inputted with pumping light with a third wavelength and amplifying the light outputted from the first light source and the light outputted from the second light source; a multiplexer multiplexing the light outputted from the first light source and the light outputted from the second light source, and outputting multiplexed light to the optical amplifier; a filter transmitting the light with the first wavelength but blocking the light with the second wavelength out of amplified light outputted from the optical amplifier; and a control unit controlling the output of the light from the second light source in accordance with the output of the light from the first light source, wherein the first light source has first and second ON states in which repetitive output of the pulsed light on a fixed cycle starts and continues, and an OFF state in which the output of the pulsed light is suspended during a duration of not less than the fixed cycle between the first and second ON states, and wherein, while the pumping light is continuously inputted to the optical amplifier between the first and second ON states, the control unit controls the second light source to output the light to the optical amplifier during the duration of the first light source being in the OFF state.