OPTICAL FIBER LASER USING RARE EARTH-ADDED FIBER AND WIDE BAND LIGHT SOURCE

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Fiber laser comprising, provided in a resonator, an optical fiber having a normal dispersion, an optical fiber having an abnormal dispersion, a rare earth-added optical fiber as a gain medium, and mode synchronizing mechanism, characterized in that at least a rare earth-added optical fiber is included as an optical fiber having a normal dispersion, and the length of a rare earth-added fiber is set to be smaller than that of an optical fiber having an abnormal dispersion.