Optical fiber with ring-shaped doped layer and preparation method thereof and laser containing optical fiber

Abstract

The invention discloses an optical fiber with a ring-shaped doped layer, which is used in an optical fiber laser and composed of an inner clad layer (101), a ring-shaped doped layer (102), a middle clad layer (103), an outer clad layer (104) and a protective layer (105), wherein the ring doped layer (102), the middle clad layer (103), the outer clad layer (104) and the protective layer (105) are, from inside to outside, sequentially clad on the inner clad layer (101), and the inner clad layer (101) is an undoped optical fire core. The invention also discloses a method for preparing the optical fiber with a ring-shaped doped layer, and a laser taking the optical fiber with a ring-shaped doped layer as a gain medium. According to the invention, the traditional fiber core doping is changed into a ring-shaped doped layer, so that the laser oscillation is actually performed in a ring-shaped waveguide, and then through reasonably designing the thickness of the ring-shaped waveguide, a single-mode operation can be kept; meanwhile, because the cross section area of the doped layer is large, the optical fiber with a ring-shaped doped layer is suitable to high-power output, therefore, the output power of the optical fiber laser using the optical fiber can be improved.

Description

technical field [0001] The invention belongs to the technical field of optical fiber lasers, and in particular relates to a ring-shaped doped layer optical fiber capable of high power output, a preparation method thereof and a laser containing the optical fiber. Background technique [0002] Fiber laser refers to a laser that uses rare earth element-doped glass fiber as the gain medium. Under the action of pump light, it is easy to form a high power density in the fiber, resulting in "number inversion" of the laser energy level of the laser working material. When properly added A positive feedback loop (forming a resonant cavity) can form a laser oscillation output. [0003] Fiber lasers have a wide range of applications, including laser optical fiber communication, laser space long-distance communication, industrial shipbuilding, automobile manufacturing, laser engraving, laser marking, laser cutting, printing rollers, metal and non-metal drilling / cutting / welding (brazing, ...

AI Technical Summary

Problems solved by technology

For increasing the doping concentration, after increasing the doping concentration, the pump absorption coefficient per unit length will increase, and the corresponding gain will increase, but it will also reduce the purity and uniformity of the quartz, and reduce the laser damage threshold of the fiber end face

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