FIBER LASER

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A fiber laser is provided with a signal light source for outputting signal light, and a rare earth element doped fiber, which amplifies the signal light outputted from the signal light source and outputs it. The fiber laser is further provided with a Raman amplification fiber, which is arranged as a part of a light transmitting path for outputting the light outputted from the rare earth element doped fiber to the external, and a wavelength selecting element, which is arranged on the light transmitting path from the Raman amplification fiber to the signal light source and does not transmit Stokes light generated at the Raman amplification fiber.