FIBER LASER DEVICE

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PROBLEM TO BE SOLVED : To provide a fiber laser device in which spontaneous emission light is suppressed and efficiency in pulse amplification is improved. SOLUTION : A fiber laser device includes a seed light source, a polarizing holding fiber, an excitation light source, an optical coupler, a polarizer, and a spontaneous emission light control part. The polarizing holding fiber includes a first end part and a second end part on the side opposite to the first end part, with rare earth element added, and emits seed light as pulse amplification light while holding polarizing state of the seed light introduced from the first end part. The optical coupler allows the pulse amplification light to pass, and introduces excitation light into the second end part of the polarizing holding fiber. The polarizer is arranged in such a manner as a transmission axis is parallel to a polarizing axis of the pulse amplification light, and capable of reflecting an orthogonal component to the transmission axis in the light emitted from the second end part of the polarizing holding fiber. In spontaneous emission light, an output of excitation light is controlled by detecting inclination of light intensity of the reflection light of the polarizer relative to the light intensity of the seed light. COPYRIGHT : (C)2015, JPO&INPIT