LIGHT SOURCE DEVICE

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A laser device or a light source employing a pumping LD emitting excitation light having a wavelength longer than that of the emitting light, a resonator, and a rare earth element-added fiber characterized in that the standardized frequency V of the rare earth element-added fiber is between 2.4 and 3.9 times of the wavelength of the emitting light, and a fiber exhibiting single mode for such a light as generated by a part of fibers other than the rare earth element-added fiber is inserted into the resonator.