FIBER LASER DEVICE

A fiber laser device includes: a first pumping light source that outputs a first pumping light of a first wavelength; a second pumping light source that outputs a second pumping light of a second wavelength that is shorter than the first wavelength; an amplifying fiber that includes a core including an active element that is configured to be excited by the first pumping light and the second pumping light; an HR-FBG (High Reflectivity-Fiber Bragg Grating) on a side of a first end of the amplifying fiber; an OC-FBG (Output Coupler-Fiber Bragg Grating) disposed on a side of a second end of the amplifying fiber and that has a reflectance lower than a reflectance of the HR-FBG; and a first coupler that couples the first pumping light to the amplifying fiber from the side of the first end.