OPTICAL FIBER LASER DEVICE

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A first fiber (30) is connected to a first end of a third fiber (50) doped with a rare earth element, and a second fiber (80) is connected to a second end of the third fiber (50). In the third fiber (50) doped with the rare earth element, a central portion of a core (54) is more heavily doped with the rare earth element than a peripheral portion of the core (54) is.