Seed source and pulse adjustment method of pulsed fiber laser

A fiber laser and fiber combiner technology, applied in the laser field, can solve problems such as the limitation of repetition frequency adjustment, and achieve the effects of flexible design, large tunable range, and flexible repetition frequency change

Active Publication Date: 2021-10-22
WUHAN RAYCUS FIBER LASER TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the modulation method mentioned above, there are certain limitations in its repetition frequency adjustment and the pulse width changes with the repetition frequency, and the waveform is generally a single Gaussian waveform or a Gaussian-like waveform.
This modulation method has certain limitations in practical applications, so it is necessary to provide a pulsed fiber laser seed source that can achieve adjustable repetition frequency, adjustable pulse width, and adjustable waveform

Method used

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  • Seed source and pulse adjustment method of pulsed fiber laser
  • Seed source and pulse adjustment method of pulsed fiber laser
  • Seed source and pulse adjustment method of pulsed fiber laser

Examples

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Effect test

Embodiment 1

[0072] This embodiment provides a kind of pulsed fiber laser seed source, its structure is as follows figure 1 As shown, it includes: a first grating 5, a second grating 6, a third grating 7, a first pumping source 1, a second pumping source 2, a first fiber combiner 3, a second fiber combiner 4, A first gain fiber 8 , a second gain fiber 9 , a modulator 10 and an output device 11 .

[0073] Among them, the first pump source 1 and the second pump source 2 use semiconductor laser diodes with a center wavelength of 915nm or 976nm; the first fiber combiner 3 and the second fiber combiner 4 use (2+1) 1 Fiber beam combiner, such as 10 / 125 type, 20 / 125 type; the first grating 5, the second grating 6 and the third grating 7 are reflective fiber Bragg gratings, the first grating 5 is a high-reflection grating, and the second grating The grating 6 and the third grating 7 are partially reflective gratings, and the reflectivity is greater than 0 and less than 1; the first gain fiber 8 a...

Embodiment 2

[0080] The present embodiment provides the second kind of pulsed fiber laser seed source, its structure is as follows figure 2 As shown, the basic structure is the same as figure 1 Similar, the difference is that the positions of the second pump source 2 and the second fiber combiner 4 are different. In this embodiment, the second pump source 2 and the second fiber combiner 4 are placed in the third grating 7 and the second gain Between the optical fibers 9.

Embodiment 3

[0082] The present embodiment provides the third kind of pulsed fiber laser seed source, its structure is as follows image 3 As shown, the basic structure follows figure 1 Similar, the difference is that the positions of the first pump source 1 and the first fiber combiner 3 are different. In this embodiment, the first pump source 1 and the first fiber combiner 3 are placed in the second grating 6 and the modulator 10 between.

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Abstract

The present application discloses a pulsed fiber laser seed source and a pulse adjustment method. The seed source generates quadrilateral pulses through a modulator outside the first resonant cavity, and the modulator can also be used as a Q switch in the second resonant cavity, thereby Generate Gaussian or Gaussian-like pulses, that is, in the same seed source, by adjusting the pump power, the pulse shape can be adjusted; on the other hand, when the modulator outside the first resonant cavity generates quadrilateral pulses, the pulse width is modulated according to The switch-on time of the modulator is controlled, and the pulse repetition frequency is controlled according to the repetition frequency of the modulator. The pulse width and repetition frequency are more flexible and the adjustable range is larger.

Description

technical field [0001] The present application relates to the field of lasers, in particular to a pulsed fiber laser seed source and a pulse adjustment method. Background technique [0002] Fiber lasers have the advantages of good beam quality, high efficiency, good heat dissipation, compact structure, high reliability, and easy maintenance, and have attracted widespread attention. Pulse lasers with high energy, adjustable repetition frequency, adjustable pulse width, and adjustable waveform play an important role in the laser field. At present, nanosecond pulsed fiber lasers have been widely used in laser processing, optical fiber communications, military defense security, and medical machinery. instruments and other fields. [0003] In the pulsed fiber laser seed source, modulation is performed by adding electro-optic, acousto-optic modulators or saturable absorbers in the resonant cavity formed based on grating feedback. In the above-mentioned modulation method, the rep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067H01S3/094H01S3/11
CPCH01S3/0675H01S3/094076H01S3/11
Inventor 颜鹏晖陶斌凯黄保闫大鹏
Owner WUHAN RAYCUS FIBER LASER TECHNOLOGY CO LTD
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