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PROBLEM TO BE SOLVED : To provide a laser oscillating device capable of stabilizing resonance even making the finesse of an optical resonator high and capable of generating a stronger laser light compared to a conventional device by accumulating the laser light in the optical resonator.
SOLUTION : The laser oscillating device includes : an excitation laser light source for generating excitation laser light; a rare earth fiber for generating the laser light of a desired wavelength when the laser light generated by the excitation laser light source is supplied; the optical resonator for accumulating the laser light generated by the rare earth fiber, which is composed of a mirror group including 2 concave mirrors disposed opposite each other or a plurality of flat mirrors; an optical isolator which is inserted between the optical resonator and the rare earth fiber, guides the laser light from the rare earth fiber to the one side of the optical resonator and shuts down the laser light of the opposite direction; and a revolving optical path for promoting the resonance by taking up the laser light irradiated from the other side of the optical resonator and returning to the optical resonator via the rare earth fiber and the optical isolator.
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