An anti-return light all-fiber device

Abstract

The invention discloses an anti-return light all-fiber device, which comprises an energy transmission fiber, a cladding light filter and a beam splitting fiber, the cladding light filter is prepared on the energy transmission fiber, and the beam splitting The optical fiber is coupled on the cladding of the energy-transmitting optical fiber; along the output laser direction of the energy-transmitting optical fiber, the cladding optical filter and the splitting optical fiber are arranged in sequence; the splitting optical fiber is used to guide the energy-transmitting optical fiber Acting on the target object, the return light reflected by the target object; the cladding optical filter filters the return light by destroying the beam full emission condition of the cladding of the energy-transmitting optical fiber. Introduce the splitting fiber and cladding filter into the energy-transmitting fiber output by the laser, use the splitting fiber to guide most of the return light power out, and combine the cladding light filter to do further return light stripping, the cladding The light filtering device further effectively filters the unexported return light, so that the optical fiber device of the present invention has the ability to resist high-power return light.

Description

technical field [0001] The invention belongs to the field of optical fiber laser technology, and in particular relates to an anti-return light all-fiber device. Background technique [0002] In the cutting and welding applications of high-power fiber laser equipment, especially in the processing of highly reflective materials such as copper, aluminum and their alloys, return light processing has always been one of the technical problems in the field of high-power fiber laser applications. When materials with high reflection coefficients such as copper, aluminum and their alloys are on the surface of the material with the laser beam, a part of the laser light will propagate along the original optical fiber path and return. This return light will cause the laser to run unstable, and cause the laser protection device to alarm and Stopping work and running for a long time will shorten the life of the laser, and in serious cases will destroy the fiber laser. Insufficient anti-hi...

AI Technical Summary

Problems solved by technology

At present, the commonly used method is to use the cladding optical filter to strip the return light, but when the cladding optical filter strips the cladding light laser and the remaining pump light of the high-power output laser, the optical power of hundreds of watts is stripped. , the device itself will generate a certain amount of heat. If there is high-power return light entering the cladding optical filter at this time, it will increase the load on the device and increase the heat generation. The heat generation of the device will affect the filtering performance, and there will be return light Entering the resonator will affect the stability of the laser operation, and in severe cases, the cladding optical filter will be burned

In addition, if there is a Stokes light component in the returned light, it will be amplified by power during reverse transmission. This kind of light reverse transmission is extremely harmful, and it will damage the optical fiber device and destroy the resonant cavity during the return process.

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