Coaxial double-waveguide ytterbium-doped active fiber and preparation method thereof

Abstract

The invention discloses a coaxial double-waveguide ytterbium-doped active fiber and a preparation method thereof. An ytterbium-doped quartz layer is deposited between a circular Ytterbium-doped fiberpre-form rod and an outer quartz glass tube to present a circular geometric distribution shape. Negative-pressure rod shrinkage is carried out on the outer quartz tube and the inner circular fiber pre-form rod so that a circular ytterbium-doped fiber core is fused with the outer quartz tube and the circular fiber pre-form rod to form a coaxial double-waveguide ytterbium-doped active fiber pre-formrod. Then, the pre-form rod is ground and polished to make a fiber cladding in an octagonal shape. After drawing, coating with low refractive index is applied as a coating layer, and a coaxial double-waveguide ytterbium-doped fiber is obtained. The method is simple and practical, has high process flexibility, and can be used to prepare coaxial double-waveguide ytterbium-doped fibers of differentcore-to-cladding ratios. The interaction between pump light and a gain medium fiber core in the cladding is enhanced, and the intensity of the output optical field of the fiber is improved. The coaxial double-waveguide ytterbium-doped active fiber can be used in the development of high-power fiber laser related devices.

Description

technical field [0001] The invention relates to optical fiber preparation technology, in particular to a coaxial double-waveguide type ytterbium-doped active optical fiber and a preparation method thereof, which can be applied to the field of high-power optical fiber laser development. Background technique [0002] Due to its good output laser beam quality, high conversion efficiency, low aurora and low cost, small size, and simple structure, fiber lasers have great research value and advantages. And high-power fiber laser is an important trend of future development. In order to further develop fiber lasers with smaller volume and higher output power, it is necessary to improve the gain fiber in existing fiber lasers. Therefore, the emergence of fiber lasers using multi-core active fibers as gain media can effectively solve the problems of device miniaturization and high output power. Traditional fiber lasers use ytterbium-doped double-clad single-mode fiber as the gain me...

AI Technical Summary

Problems solved by technology

Traditional fiber lasers use ytterbium-doped double-clad single-mode fiber as the gain medium, and the pump light is amplified by the fiber core to generate laser light. However, the coupling efficiency of the pump light in this structure is not high, so it has a great impact on the output laser efficiency.

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