A pulsed fiber laser and its working method

Abstract

The disclosure provides a pulsed fiber laser and a working method, which belong to the technical field of fiber lasers. The laser includes a power beam combiner, a QBH output fiber and at least two sub-beam pulsed fiber amplifiers; the output fiber of the sub-beam pulsed fiber amplifier and the power The input optical fiber of the beam combiner is connected, the output optical fiber of the power beam combiner is connected with the QBH output optical fiber, and the 20dB spectral width corresponding to the output laser of each sub-bundle pulse fiber amplifier is less than or equal to the preset threshold; this disclosure adopts the 20dB spectral width The power combination of sub-beam pulsed fiber amplifiers that does not exceed the preset threshold effectively suppresses the mutual interference between the sub-beam pulsed fiber amplifiers due to nonlinear effects, and eliminates the sub-beam pulses faced when combining beams in low repetition rate mode The random burning phenomenon of the fiber amplifier can obtain pulse laser output with greater pulse energy and lower repetition rate.

Description

technical field [0001] The present disclosure relates to the technical field of fiber lasers, in particular to a pulsed fiber laser and a working method. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Fiber lasers have the advantages of high beam quality, convenient thermal management, and strong environmental adaptability, and are widely used in modern industrial processing technology. High-power nanosecond pulsed fiber lasers have great application prospects in metal marking, engraving, and rust removal. In order to further improve the processing range of nanosecond pulsed fiber lasers and meet the needs of more processing techniques, it is necessary to further increase the output power of nanosecond pulsed fiber lasers. Limited by the withstand power of the isolator, pulsed fiber lasers with average power above kilowatts can be obta...

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Problems solved by technology

[0005] The inventors of the present disclosure found that the above scheme can effectively increase the average power of the output pulsed fiber laser, but the repetition frequency of the sub-beam pulsed laser used is usually about 100kHz, and the single pulse energy is low. In the research, it was found that in the above scheme, if the pulse repetition frequency of the sub-beam pulsed laser used is lower than 20kHz, the phenomenon of random burning of the sub-beam laser will occur; therefore, the problem faced by the above scheme is that it cannot obtain pulses with high energy and low repetition frequency. laser, which limits its industrial laser processing performance

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