Laser device of optical fiber with automatic protection of semiconductor pumping sources

Abstract

The invention relates to a fiber laser device provided with automatic protection of semiconductor pumping sources, which is characterized by comprising a multimode pumping optical fiber combiner, a plurality of semiconductor pumping sources, a fiber laser device, a retroreflection laser power monitoring device and a driving power for semiconductor pumping sources. The multimode pumping optical fiber combiner is provided with N input multimode transmitting energy fibers and a pumping fiber, wherein, N is positive integer more than 1; the pumping fiber is connected with the input end of the fiber laser device; one of the N input multimode transmitting energy fibers is connected with the control end of the driving power of the semiconductor pumping sources by the retroreflection laser power monitoring device to judge whether the laser returned is too strong by monitoring the signal power of the returned laser of the idle pumping fiber and to automatically cut off the power supply of the semiconductor pumping sources according to the judgment so as to automatically protect the pumping source semiconductor laser. The fiber laser device of the invention has the advantages of simple structure, low cost and wide application.

Description

technical field [0001] The invention relates to a fiber laser device, in particular to a fiber laser device with automatic protection of a semiconductor pump source. Background technique [0002] Fiber lasers using semiconductor lasers as pumping sources have the advantages of small size, light weight, and high pumping efficiency. However, due to the structural characteristics of semiconductor lasers, they are very sensitive to laser light irradiated to semiconductors, and low-power laser irradiation can greatly Accelerate the aging process of the semiconductor, resulting in the failure of the semiconductor laser pump source. With the increasing application of lasers in industrial processing and target indication, the requirements for the average output power of lasers are also getting higher and higher. When the target is irradiated with high average output power, part of the laser light will be reflected in the irradiated area and return along the outgoing optical path. C...

AI Technical Summary

Problems solved by technology

[0002] Fiber lasers using semiconductor lasers as pumping sources have the advantages of small size, light weight, and high pumping efficiency. However, due to the structural characteristics of semiconductor lasers, they are very sensitive to laser light irradiated to semiconductors, and low-power laser irradiation can greatly Accelerate the aging process of semiconductors, resulting in the failure of semiconductor laser pumping sources

With the increasing application of lasers in industrial processing and target indication, the requirements for the average output power of lasers are also getting higher and higher. When the target is irradiated with high average output power, part of the laser light will be reflected in the irradiated area and return along the outgoing optical path. Causes damage to the semiconductor pump source

[0003] At present, the protection of the semiconductor pump source is achieved by adding a high-power isolator in front of the laser output window to completely block the retroreflected laser light, but this method makes the cost of the laser high, especially the structure of the laser output head is more complicated. , the volume is large, it is difficult to realize miniaturization, and it lacks the convenience of application

Images