Summary of the technology This technology relates to a laser beam, and more particularly to a optical fiber laser beam at visible wavelength provided to generate optimum blue and green laser beam at the same time as a single semiconductor laser excitation light source, by using an Ytterbium-doped fiber and a Thorium-doped fiber.
In a laser beam generating apparatus using a semiconductor laser generating a laser beam for pumping and a lens collecting the pumping light generated from the semiconductor laser, this technology is comprised of an Ytterbium-doped optical fiber, which makes laser oscillation by stimulated emission by an input light and emits a light by up-conversion of the laser beam of the semiconductor laser; and a second optical fiber, which receives the light outputted from the Ytterbium-doped optical fiber and not-absorbed semiconductor laser beam, and emits a prescribed light by up-conversion of the incident infrared laser beam.
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