Patent ID: 8073022

Claim:
A laser light source device, comprising: a laser oscillator for emitting at least two fundamental waves; a laser light irradiator adapted to respectively convert the at least two fundamental waves emitted from the laser oscillator into respective harmonic waves and capable of irradiating the converted harmonic waves; and a fiber unit disposed between the laser oscillator and the laser light irradiator for transmitting the at least two fundamental waves emitted from the laser oscillator to the laser light irradiator, wherein the laser oscillator includes: a laser light source for emitting an excitation light; and a laser cavity including (i) a fiber containing a laser-active substance and on which the excitation light from the laser light source is incident, (ii) at least two first fiber gratings provided at a laser light source side of the fiber, which is toward the laser light source, (iii) at least two second fiber gratings provided at a light emission end of the fiber, which is away from the laser light source, the at least two second fiber gratings having a one-to-one correspondence with the at least two first fiber gratings, and (iv) a light branching unit positioned between the fiber and each of the at least two second fiber gratings, the light branching unit branching light emitted from the fiber in accordance with polarization directions, and wherein each of branched lights branched by the light branching unit is incident on each of the at least two second fiber gratings.