FIBER LASER DEVICE HAVING EXCITATION LIGHT SOURCE PROTECTION DEVICE

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In a fiber laser device equipped with at least a pumping source, a rare-earth element doped fiber and a resonator, there is provided the fiber laser device equipped with a pumping source protecting device that is between the pumping source and the resonator, that prevents a laser light generated by the resonator from being incident on the pumping source, and that has no isolator function.