FIBER LASER DEVICE, LASER PROCESSING DEVICE, AND LASER PROCESSING METHOD

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PROBLEM TO BE SOLVED : To provide a fiber laser device capable of reducing return light while maintaining a simple structure, to provide a laser processing device, and to provide a laser processing method. SOLUTION : The fiber laser device includes : a pump source capable of emitting pumping light; an active fiber having a core to which a rare-earth element is added and in which the rare-earth element is capable of absorbing the pumping light to amplify incident laser light; a combiner which is connected to one end of the active fiber and is capable of making the pumping light incident on the active fiber; a fiber for transmission capable of transmitting projection laser light from the other end of the active fiber and also irradiating a body to be irradiated; and a divider provided between the other end of the active fiber and the fiber for transmission, and branching and emitting at least part of scattered light or reflected light from the body to be irradiated to the outside to reduce the return light traveling to the other end of the active fiber. Further, the laser processing device and laser processing method are disclosed. COPYRIGHT : (C)2010, JPO&INPIT