Optical fiber and fiber laser comprising optical fiber

Abstract

The invention discloses an optical fiber and a fiber laser. The optical fiber comprises an outer cladding, a protective layer and a fiber core; the fiber core is formed by a rare earth-doped active fiber core body and n pure quartz pumping fiber core bodies, wherein the rare earth-doped active fiber core body is provided with a pure quartz inner cladding, and the n is greater than or equal to 1; each pumping fiber core body and the active fiber core body are mutually contacted but not fused together, wherein the spread length of a contact site is greater than or equal to one tenth of the perimeter of the pumping fiber core body so that light can be coupled from the pumping fiber core body to the active fiber core body in a one-way mode. The fiber laser comprises the optical fiber, a resonant cavity and a semiconductor laser body, wherein a high-reflective optical grating and a low-reflective optical grating are etched in the two ends of the active fiber core body respectively and service as the resonant cavity together; the pumping fiber core bodies are connected with the semiconductor laser body in a fusion welding mode. The optical fiber can reduce the number of fusion welding points to the maximum extent and effectively improve pumping light absorption efficiency, thereby realizing heat dissipation inside the fiber laser and improving output quality of the fiber laser; since cerium is used, the fiber laser also has the advantages of resistance to photon darkening and radiation.

Description

technical field [0001] The invention belongs to the fields of special optical fiber preparation technology and optical fiber lasers, and in particular relates to an optical fiber with a novel structure used in optical fiber lasers and an optical fiber laser containing the optical fiber. Background technique [0002] In recent years, fiber lasers have developed rapidly, especially since the invention of double-clad fibers, the output power of fiber lasers has climbed from milliwatts to 10,000 watts. At present, the structure of all-fiber lasers contains many fusion points. As the power increases, the heat accumulated at the fusion points becomes one of the important factors restricting the beam quality, stability and output power of fiber lasers. [0003] The current conventional fiber laser consists of a pump source, a pair of fiber gratings and an active rare-earth-doped fiber, and the connection of these devices depends on fiber fusion. When there are deviations in the ge...

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Problems solved by technology

[0004] In addition, most of the current fiber gratings are prepared by using the photosensitivity of germanium-doped fibers, but adding germanium to doped fibers will reduce the damage threshold of the fiber and increase the numerical aperture, which is not conducive to the construction of high-power fiber lasers. The grating is engraved on the germanium-doped passive fiber, and then fused at both ends of the doped fiber, which will increase the fusion point of the laser, increase the loss and reduce the stability of the laser

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