NEW-WAVELENGTH DOUBLE-CLADDING YTTERBIUM-DOPED OPTICAL FIBER AND PREPARATION METHOD THEREFOR

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A new-wavelength double-cladding ytterbium-doped optical fiber (11) and a preparation method therefor. The method comprises the following steps : using MCVD, introducing raw materials, and depositing a first layer of SiO2 loose layer on the inner wall of a quartz reaction tube; using a solution immersion method to dope rare earth ion, and pouring the solution into an area, having the loose layer structure, in the quartz reaction tube by means of a liquid injection tube; erecting the quartz reaction tube and then rotating same, and submerging same in the solution for a certain period of time; stopping the rotation, and performing a minimally invasive incision below the quartz reaction tube, enabling the liquid to flow out; sintering the SiO2 loose layer subjected to solution immersion, depositing a second layer of SiO2 loose layer, and repeating the steps of liquid phase doping and sintering once; and melting and condensing the quartz reaction tube into a solid rod, so as to obtain a core rod, and performing wire drawing thereon, so as to obtain a new-wavelength double-cladding ytterbium-doped optical fiber (11). The new-wavelength double-cladding ytterbium-doped optical fiber (11) can reduce quantum deficit of a laser, improving efficiency and reducing thermal issues.