CN112202041A - Pulse fiber laser and working method - Google Patents
Pulse fiber laser and working method Download PDFInfo
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- CN112202041A CN112202041A CN202011085537.4A CN202011085537A CN112202041A CN 112202041 A CN112202041 A CN 112202041A CN 202011085537 A CN202011085537 A CN 202011085537A CN 112202041 A CN112202041 A CN 112202041A
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- 239000000835 fiber Substances 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 10
- 239000013307 optical fiber Substances 0.000 claims abstract description 53
- 230000003595 spectral effect Effects 0.000 claims abstract description 15
- 238000005253 cladding Methods 0.000 claims description 6
- 230000009022 nonlinear effect Effects 0.000 abstract description 6
- 238000001228 spectrum Methods 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012994 industrial processing Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Lasers (AREA)
Abstract
The utility model provides a pulse fiber laser and a working method, belonging to the technical field of fiber lasers, wherein the laser comprises a power beam combiner, a QBH output fiber and at least two sub-beam pulse fiber amplifiers; the output optical fiber of the sub-beam pulse optical fiber amplifier is connected with the input optical fiber of the power beam combiner, 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-beam pulse optical fiber amplifier is smaller than or equal to a preset threshold value; according to the method, the power combination of the sub-beam pulse optical fiber amplifiers with the spectral width of 20dB not exceeding the preset threshold is adopted, so that mutual interference between the sub-beam pulse optical fiber amplifiers due to the nonlinear effect is effectively inhibited, the random burning phenomenon of the sub-beam pulse optical fiber amplifiers during combination in a low repetition frequency mode is eliminated, and the pulse laser output with larger pulse energy and lower repetition frequency can be obtained.
Description
Technical Field
The disclosure relates to the technical field of fiber lasers, in particular to a pulse fiber laser and a working method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The fiber laser has the advantages of high beam quality, convenient thermal management, strong environmental adaptability and the like, and is widely applied to modern industrial processing technology. The high-power nanosecond pulse fiber laser has great application prospect in the aspects of metal marking, engraving, rust removal and the like. In order to further increase the processing range of the nanosecond pulse fiber laser and meet more processing technology requirements, the output power of the nanosecond pulse fiber laser needs to be further increased, the output power is limited by the bearing power of the isolator, and the pulse fiber laser with the average power above kilowatt is usually achieved by combining the powers of a plurality of sub-beam pulse laser units.
Researchers provide a high-power pulse laser for laser cleaning, which is characterized in that a plurality of acousto-optic Q-switched pulse fiber lasers are adopted for power beam combination to realize high-power nanosecond pulse laser output, and meanwhile, the pulse width of output laser is adjustable by adjusting the phase difference between sub-beam pulse lasers. Similarly, researchers also provide a pulse fiber laser, pulse lasers output by a plurality of pulse laser units are combined by a power combiner, and the pulse lasers output by the plurality of laser units can be effectively overlapped in the combined laser by adjusting the pulse width and the phase of the laser output by the pulse laser units, so that the power of the pulse combined laser is further improved.
The inventor of the present disclosure finds that the above scheme can effectively achieve the improvement of the average power of the output pulse fiber laser, but the repetition frequency of the used sub-beam pulse laser is high and is usually about 100kHz, and the single pulse energy is low, and the applicant of the present invention finds that, in the above scheme, if the pulse repetition frequency of the adopted sub-beam pulse laser is lower than 20kHz, the phenomenon that the sub-beam laser is randomly burned out occurs; therefore, the above scheme faces a problem that a pulsed laser with a large energy and a low repetition rate cannot be obtained, which limits the industrial laser processing performance.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a pulse fiber laser and a working method thereof, by adopting the power beam combination of the sub-beam pulse fiber amplifier with the spectral width of 20dB not exceeding the preset threshold, the mutual interference between the sub-beam pulse fiber amplifiers caused by the nonlinear effect is effectively inhibited, the random burning phenomenon of the sub-beam pulse fiber amplifier when the beams are combined in a low repetition frequency mode is eliminated, and the pulse laser output with larger pulse energy and lower repetition frequency can be obtained.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
the present disclosure provides, in a first aspect, a pulsed fiber laser.
A pulse fiber laser comprises a power beam combiner, a QBH output fiber and at least two sub-beam pulse fiber amplifiers;
the output optical fiber of the sub-beam pulse optical fiber amplifier is connected with the input optical fiber of the power beam combiner, 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-beam pulse optical fiber amplifier is smaller than or equal to a preset threshold value.
As some possible implementations, the preset threshold is 10 nm.
As some possible implementations, the preset threshold is any value between 5nm and 10 nm.
As some possible implementations, the center wavelength, output laser pulse width, and repetition frequency of each beamlet pulse fiber amplifier are the same.
As some possible implementations, the central wavelength range of the beamlet pulse fiber amplifier is 1060nm to 1080 nm.
As some possible implementations, the output laser pulse width of the beamlet pulse fiber amplifier ranges from 100ns to 150 ns.
As some possible implementations, the repetition frequency range of the beamlet pulse fiber amplifier is 10 kHz-20 kHz.
As some possible realization modes, the output average power of the sub-beam pulse fiber amplifier ranges from 200W to 300W.
As some possible realization modes, the input optical fiber of the power beam combiner is consistent with the output optical fiber of the sub-beam pulse optical fiber amplifier and is a double-clad optical fiber, the diameter range of the input optical fiber of the power beam combiner is 50-100 mu m, the numerical aperture range of the fiber core is 0.10-0.12, the diameter range of the clad is 200-400 mu m, and the numerical aperture range of the clad is 0.45-0.47.
As possible realization modes, the output optical fibers of the power beam combiner are consistent with QBH output optical fibers and are single-cladding optical fibers, the diameter range of a fiber core of the output optical fibers of the power beam combiner is 400-600 mu m, and the numerical aperture range of the fiber core is 0.2-0.24.
The second aspect of the present disclosure provides a working method of a pulse fiber laser, including the following steps:
at least two sub-beam pulse fiber amplifiers respectively send laser beams to the power beam combiner;
the power beam combiner combines the laser beams of all the sub beams and outputs the combined laser beams to the QBH output optical fiber, and pulse laser is output through the QBH output optical fiber;
wherein, the 20dB spectral width corresponding to the output laser of each sub-beam pulse fiber amplifier is less than or equal to 10 nm.
Compared with the prior art, the beneficial effect of this disclosure is:
according to the fiber laser and the working method, by adopting the power beam combination of the sub-beam pulse fiber amplifier with the spectral width of 20dB not exceeding the preset threshold (5nm-10nm), the mutual interference between the sub-beam pulse fiber amplifiers due to the nonlinear effect is effectively inhibited, the random burning phenomenon of the sub-beam pulse fiber amplifier during beam combination in a low repetition frequency mode is eliminated, and the pulse laser output with larger pulse energy and lower repetition frequency can be obtained.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic structural diagram of a pulsed fiber laser provided in embodiment 1 of the present disclosure.
Fig. 2 is a schematic diagram illustrating a comparison of output spectra of a beamlet pulse fiber amplifier provided in embodiment 1 of the present disclosure.
Wherein, 1, a sub-beam pulse fiber amplifier; 2. a power combiner; 3. QBH output fiber.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
The embodiments and features of the embodiments in the present disclosure may be combined with each other without conflict.
Example 1:
as shown in fig. 1, the present disclosure embodiment 1 provides a pulse fiber laser, including: the optical fiber amplifier comprises four paths of sub-beam pulse optical fiber amplifiers 1, a power beam combiner 2 and QBH output optical fibers 3, wherein the output optical fibers of the sub-beam pulse optical fiber amplifiers 1 are welded with the input optical fibers of the power beam combiner 2, the output optical fibers of the power beam combiner 2 are welded with the QBH output optical fibers 3, and the 20dB spectral width corresponding to the output laser of the sub-beam pulse optical fiber amplifiers 1 does not exceed 10 nm.
It is understood that, in some other embodiments, the threshold of 10nm may also be 5nm, 8nm, 9nm, or other values between 5nm and 10nm, and those skilled in the art may select the threshold according to specific conditions, which is not described herein again.
In the embodiment, the corresponding central wavelength, the output laser pulse width and the repetition frequency of different sub-beam pulse fiber amplifiers 1 are consistent, the central wavelength range is 1060 nm-1080 nm, the output laser pulse width is 100 ns-150 ns, the repetition frequency is 10 kHz-20 kHz, and the output average power is 200W-300W;
preferably, in this embodiment, the preferred center wavelength is 1064nm, the output laser pulse width is 100ns, the repetition frequency is 10kHz, and the output average power is 250W.
In the embodiment, the input optical fiber of the power combiner 2 is consistent with the output optical fiber of the beamlet pulse optical fiber amplifier 1 and is a double-clad optical fiber, the fiber core diameter of the input optical fiber of the power combiner 2 is 50-100 μm, the numerical aperture of the fiber core is 0.10-0.12, the diameter of the clad is 200-400 μm, and the numerical aperture of the clad is 0.45-0.47;
the number of input fibers of the power beam combiner is larger than or equal to that of the beamlet pulse fiber amplifiers, the output fibers of the power beam combiner 2 are consistent with QBH output fibers and are single-clad fibers, the diameter of a fiber core of the output fibers of the power beam combiner 2 is 400-600 microns, and the numerical aperture of the fiber core is 0.2-0.24.
Preferably, in this embodiment, the input fiber of the power combiner 2 is identical to the output fiber of the beamlet pulse fiber amplifier 1, and both are double-clad fibers, the core diameter of the input fiber of the power combiner 2 is 100 μm, the core numerical aperture is 0.12, the cladding diameter is 400 μm, and the cladding numerical aperture is 0.46;
preferably, the number of input optical fibers of the power combiner is 4;
preferably, the output fiber of the power combiner 2 is identical to the QBH output fiber, and is a single-clad fiber, the preferred core diameter is 400 μm, and the core numerical aperture is 0.22.
It is understood that, in other embodiments, a person skilled in the art may select the above values within a limited range, and the person skilled in the art may select the above values according to specific conditions, which is not described herein again.
Fig. 2 shows a schematic output spectrum comparison diagram of the beamlet fiber amplifier used in the embodiment and the prior art, wherein the repetition frequency of the beamlet pulse fiber amplifier used in the embodiment is 20kHz, the pulse width is 100ns, the 20dB spectral width is not more than 10nm, and the final output average power of the combined beam is 1 kW.
Also, based on the prior art scheme, four paths of sub-beam pulse fiber amplifiers are used for power beam combination, the spectrum width of the used sub-beam pulse fiber amplifiers is not limited, the output power is 250W, the pulse width is 100ns, and when the repetition frequency is 80kHz, the output average power of the combined beam can be 1 kW.
When the repetition frequency is 20kHz and the output power is 400W, one of the four paths of sub-beam pulse fiber amplifiers is burnt out. In fact, at repetition frequencies below 80kHz, prior art designs of pulsed lasers have been unable to achieve an average power of the combined beam output of greater than 1 kW.
As can be seen from fig. 2 comparing the spectra of the present embodiment and the prior art, the prior art does not limit the spectral width of the beamlet pulse fiber amplifier, but the beamlet pulse fiber amplifier has significant nonlinear effect spectral components outside the range of ± 5nm of the central wavelength, and due to the existence of the nonlinear effect spectral components, the beamlet lasers interfere with each other at a low repetition frequency (when the repetition frequency of the beamlet pulse fiber amplifier is less than 80 kHz), and the random burnout phenomenon occurs.
In the pulse optical fiber amplifier designed by the embodiment, the 20dB spectral width of the used sub-beam pulse laser does not exceed 10nm, and no nonlinear effect spectrum exists, so that the combined output average power can reach 1kW when the repetition frequency of the sub-beam pulse optical fiber amplifier is 20 kHz.
Compared with the prior art scheme, the lowest repetition frequency of the embodiment is one fourth of that of the prior art scheme, the corresponding single pulse energy is four times that of the prior art scheme, and the processing performance of the embodiment is far better than that of the prior art scheme.
Example 2:
the embodiment 2 of the present disclosure provides a working method of a pulse fiber laser, including the following steps:
at least two sub-beam pulse fiber amplifiers respectively send laser beams to the power beam combiner;
the power beam combiner combines the laser beams of all the sub beams and outputs the combined laser beams to the QBH output optical fiber, and pulse laser is output through the QBH output optical fiber;
wherein, the 20dB spectral width corresponding to the output laser of each sub-beam pulse fiber amplifier is less than or equal to 10 nm.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. The pulse fiber laser is characterized by comprising a power beam combiner, a QBH output fiber and at least two sub-beam pulse fiber amplifiers;
the output optical fiber of the sub-beam pulse optical fiber amplifier is connected with the input optical fiber of the power beam combiner, 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-beam pulse optical fiber amplifier is smaller than or equal to a preset threshold value.
2. The pulsed fiber laser of claim 1, wherein the preset threshold is 10 nm;
or,
the preset threshold value is any value between 5nm and 10 nm.
3. The pulsed fiber laser of claim 1, wherein the center wavelength, output laser pulse width and repetition frequency of each beamlet pulse fiber amplifier are the same.
4. The pulsed fiber laser of claim 1, wherein the central wavelength range of the beamlet pulse fiber amplifier is 1060nm to 1080 nm.
5. The pulsed fiber laser of claim 1, wherein the output laser pulse width of the beamlet pulse fiber amplifier ranges from 100ns to 150 ns.
6. The pulsed fiber laser of claim 1, wherein the repetition frequency of the beamlet pulse fiber amplifier is in the range of 10kHz to 20 kHz.
7. The pulsed fiber laser of claim 1, wherein the output average power of the beamlet pulse fiber amplifier is in the range of 200W to 300W.
8. The pulsed fiber laser of claim 1, wherein the input fiber of the power combiner and the output fiber of the beamlet pulse fiber amplifier are both double-clad fibers, the diameter of the input fiber of the power combiner ranges from 50 μm to 100 μm, the numerical aperture of the core ranges from 0.10 to 0.12, the diameter of the cladding ranges from 200 μm to 400 μm, and the numerical aperture of the cladding ranges from 0.45 to 0.47.
9. The pulsed fiber laser of claim 1, wherein the output fiber of the power combiner and the QBH output fiber are single cladding fibers, the core diameter of the output fiber of the power combiner ranges from 400 μm to 600 μm, and the core numerical aperture ranges from 0.2 to 0.24.
10. A working method of a pulse fiber laser is characterized by comprising the following steps:
at least two sub-beam pulse fiber amplifiers respectively send laser beams to the power beam combiner;
the power beam combiner combines the laser beams of all the sub beams and outputs the combined laser beams to the QBH output optical fiber, and pulse laser is output through the QBH output optical fiber;
wherein, the 20dB spectral width corresponding to the output laser of each sub-beam pulse fiber amplifier is less than or equal to 10 nm.
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| CN202011085537.4A CN112202041B (en) | 2020-10-12 | 2020-10-12 | Pulse fiber laser and working method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112620257A (en) * | 2021-01-19 | 2021-04-09 | 山东省科学院激光研究所 | Laser cleaning equipment and cleaning method for high-voltage switch shell |
| CN114425625A (en) * | 2022-01-14 | 2022-05-03 | 中国人民解放军军事科学院国防科技创新研究院 | Pulsed laser additive and subtractive manufacturing system and method |
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Cited By (2)
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| CN112620257A (en) * | 2021-01-19 | 2021-04-09 | 山东省科学院激光研究所 | Laser cleaning equipment and cleaning method for high-voltage switch shell |
| CN114425625A (en) * | 2022-01-14 | 2022-05-03 | 中国人民解放军军事科学院国防科技创新研究院 | Pulsed laser additive and subtractive manufacturing system and method |
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| Publication number | Publication date |
|---|---|
| CN112202041B (en) | 2022-04-26 |
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