High temperature resistant amplification optical fiber

Abstract

The invention relates to the field of laser, in particular to a high temperature resistant amplification optical fiber. The amplification optical fiber comprises a fiber core, a wrapping layer and a metal film coating layer. The metal film coating layer comprises a nickel metal layer and a non-nickel metal layer, wherein the nickel metal layer is arranged between the non-nickel metal layer and thewrapping layer and connected with the non-nickel metal layer and the wrapping layer. The high temperature resistant amplification optical fiber has the following advantages that the heat dissipationperformance of the optical fiber is enhanced, and the temperature inside the optical fiber is decreased; the temperature gradient inside the optical fiber is decreased, the temperature distribution inside the optical fiber is more uniform, thermal stress inside the optical fiber is lowered, and the strength of the optical fiber is improved; due to the fact that the optical fiber improves materialselection of different layers, the relative thickness proportion is optimized, and the failure temperature of the whole optical fiber is much higher than a traditional optical fiber, and the damage threshold value of the optical fiber is increased; the heat dissipation performance of the optical fiber is enhanced, corrosion resistance of the amplification optical fiber is improved, and the mechanical strength of the amplification optical fiber is improved properly.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a high temperature resistant amplifying optical fiber. Background technique [0002] The amplifying fiber is a very important device component in the fiber laser. At present, the amplifying fiber is mainly ytterbium-doped fiber. The ytterbium-doped fiber has the characteristics of good gain effect and high light-to-light conversion efficiency. It is the main application product of fiber lasers. As the output power of fiber lasers continues to increase, the nonlinear effect on the amplifying fiber is also enhanced. The thermal effect caused by the nonlinear effect is the most likely to cause the coating to fail and burn the fiber. Therefore, the thermal effect of the amplifying fiber greatly limits the optical fiber. Increased laser power. The structure of a traditional gain fiber is generally composed of a core, a cladding and a coating layer. The core is made of ytterbium-doped quartz gl...

AI Technical Summary

Problems solved by technology

As the output power of fiber lasers continues to increase, the nonlinear effect on the amplifying fiber is also enhanced. The thermal effect caused by the nonlinear effect is the most likely to cause the coating to fail and burn the fiber. Therefore, the thermal effect of the amplifying fiber greatly limits the optical fiber. Increased laser power

The structure of a traditional gain fiber is generally composed of a core, a cladding and a coating layer. The core is made of ytterbium-doped quartz glass material, the cladding is made of glass material, and the coating layer is acrylate with poor thermal conductivity; the core, The thermal conductivity of the cladding is 1.38W / m*℃, while the thermal conductivity of the coating is 0.2W / m*℃. This structure brings two problems to the thermal management of the optical fiber: 1. The thermal conductivity of the coating is relatively low. Small, the temperature difference inside the optical fiber will increase, which will directly lead to an excessive temperature gradient inside the optical fiber, and the high thermal stress will cause the optical fiber to break; 2. The temperature threshold of the coating layer is low. The cladding fails, which in turn leads to the failure of the entire fiber; now there is an urgent need for a new type of fiber that can increase the temperature threshold and solve its thermal effect problem

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