FIBER LASER DEVICE

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PROBLEM TO BE SOLVED : To provide a fiber laser device capable of stabilizing an intensity of laser light output therefrom. SOLUTION : The fiber laser device 100 includes an excitation light source 11 which outputs excitation light, a rare earth-doped fiber 20 to which the excitation light is input, and a first FBG 30 formed on one side of the rare earth-doped fiber 20 and a second FBG 40 formed on the other side of the rare earth-doped fiber 20, which are configured to reflect light amplified in the rare earth-doped fiber 20. The second FBG 40 has a reflectance lower than that of the first FBG 30, a reflection wavelength band within the one of the first FBG 30, and a Bragg wavelength on the short wavelength side of the Bragg wavelength of the first FBG 30. COPYRIGHT : (C)2011, JPO&INPIT