ASE LIGHT SOURCE

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A light source comprising at least an excitation light source, a fluoride optical waveguide added with a rare earth element, a multiplexing means, and an optical fiber for output, which is characterized in that ASE light having a shorter wavelength than the excitation light and generated during an up-conversion process occurring in the optical waveguide is emitted to the outside via at least one long wavelength cut-off device provided inside the device or on the outside of the device.