Multi wavelength laser light source uses a fluorescent optical b fibre based resonator for such as L

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multi-wavelength laser light source with a fluorescent fiber, a blue semiconductor laser element for emitting an excitation light comprising : , and an optic fiber with a fiber end surface on a first side and a fiber end surface on a second side, wherein the excitation light emitted from the blue semiconductor laser element is allowed to be incident on the fiber end surface on the first side and the thus fiber end surface on the first side to be incident on the fiber end surface on the second side is emitted by the excitation light serene, wherein the fiber optic dichroic mirror sections, the form a laser resonator has, in each case their fiber front surfaces on the first and second sides and the core of the fiber optic is prepared from a wavelength transformation element, the low phonon energy contains a glass, contains praseodymium ions as trivalent rare earth ions therein at least the excitation by the excitation light for emitting wavelength transformation lights by.