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A pulsed fiber laser and its working method

A technology of fiber lasers and fiber amplifiers, which is applied to lasers, laser components, phonon exciters, etc., can solve problems such as limiting industrial laser processing performance, low repetition frequency, and sub-beam laser burnout, so as to eliminate random burnout phenomena, The effect of suppressing mutual interference and large pulse energy

Active Publication Date: 2022-04-26
NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A pulsed fiber laser and its working method
  • A pulsed fiber laser and its working method

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Embodiment 1

[0035] Such as figure 1 As shown, Embodiment 1 of the present disclosure provides a pulsed fiber laser, including: a four-way sub-beam pulsed fiber amplifier 1, a power combiner 2 and a QBH output fiber 3, and the output fiber of the sub-beam pulsed fiber amplifier 1 is combined with the power The input fiber of the power beam combiner 2 is fused, the output fiber of the power beam combiner 2 is fused with the QBH output fiber 3, and the 20dB spectral width corresponding to the output laser of the sub-beam pulse fiber amplifier 1 does not exceed 10nm.

[0036] It can be understood that in some other embodiments, the threshold of 10nm may also be 5nm or 8nm or 9nm or other values ​​between 5nm and 10nm, which can be selected by those skilled in the art according to specific working conditions, and will not be repeated here.

[0037] In this embodiment, the central wavelength, output laser pulse width, and repetition frequency corresponding to different sub-beam pulsed fiber amp...

Embodiment 2

[0052] Embodiment 2 of the present disclosure provides a working method of a pulsed fiber laser, comprising the following steps:

[0053] At least two sub-beam pulse fiber amplifiers respectively send laser beams to the power beam combiner;

[0054] The power beam combiner combines each sub-beam laser beam and outputs it to the QBH output fiber, and outputs the pulse laser through the QBH output fiber;

[0055] Wherein, the 20dB spectral width corresponding to the output laser of each sub-beam pulsed fiber amplifier is less than or equal to 10nm.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/108H01S3/11
CPCH01S3/06754H01S3/06708H01S3/108H01S3/11
Inventor 梁秀兵孔令超胡振峰陈永雄王荣崔辛张志彬
Owner NAT INNOVATION INST OF DEFENSE TECH PLA ACAD OF MILITARY SCI