CN102240846B - Linearly polarized pulsed fiber laser processing device with all-fiber structure - Google Patents
Linearly polarized pulsed fiber laser processing device with all-fiber structure Download PDFInfo
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- CN102240846B CN102240846B CN201110164672.2A CN201110164672A CN102240846B CN 102240846 B CN102240846 B CN 102240846B CN 201110164672 A CN201110164672 A CN 201110164672A CN 102240846 B CN102240846 B CN 102240846B
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- 239000000835 fiber Substances 0.000 title claims abstract description 34
- 230000010287 polarization Effects 0.000 claims abstract description 106
- 238000005086 pumping Methods 0.000 claims abstract description 33
- 230000003287 optical effect Effects 0.000 claims abstract description 7
- 239000013307 optical fiber Substances 0.000 claims description 77
- 230000002596 correlated effect Effects 0.000 claims description 21
- 230000001419 dependent effect Effects 0.000 claims description 16
- 238000003466 welding Methods 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 9
- 238000010168 coupling process Methods 0.000 claims description 9
- 238000005859 coupling reaction Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 230000003321 amplification Effects 0.000 abstract description 34
- 238000003199 nucleic acid amplification method Methods 0.000 abstract description 34
- 238000003754 machining Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 7
- 239000006096 absorbing agent Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000009931 harmful effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003667 anti-reflective effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000005459 micromachining Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
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Abstract
The invention provides a linearly polarized pulsed fiber laser processing device with an all-fiber structure, comprising a fiber laser device, a plurality of amplification stage units, and a polarization related collimator isolator, a polarization beam splitter and a lambda/4 wave plate which are sequentially arranged at the side of the final output end of the plurality of amplification stage units; the fiber laser device is used for generating pulsed laser; the plurality of amplification stage units comprise a polarization related isolator, a pumping source, a polarization related beam combiner and a double-clad polarization maintaining fiber; the amplified laser output by the plurality of amplification stage units irradiates on a workpieces to be processed after passing through the polarization related collimator isolator, the polarization beam splitter and the lambda/4 wave plate; and then after passing through the lambda/4 wave plate, the laser which is reflected by the workpiece to be processed and returned along the optical axis has a polarization direction perpendicular to the original polarization direction; therefore, the laser is reflected in the direction perpendicular to the optical axis by the polarization beam splitter. The linearly polarized pulsed laser device provided by the invention has the advantages of high stability, low cost and a function of preventing reflecting lights.
Description
Technical field
The present invention relates to a kind of linear polarization pulse optical fiber laser processing device in full optical fiber structure for industrial processes, belong to laser technology field.
Background technology
Along with the development of correlation technique, laser processing technology, as the representative of modern industry high-tech process technology, has been widely used in the industrial circles such as mark, cutting, welding, punching, coating.Develop the optical fiber laser the nineties in last century, with traditional CO
2laser instrument is compared with solid state laser, have that volume is little, energy consumption is low, beam quality high good, efficiency is high, stability is high, the feature such as non-maintaining, progressively replaces the status of conventional laser in industrial processes.Wherein, have high repetition frequency, high-peak power, high single pulse energy pulse optical fiber receive much concern in Laser Micro-Machining, laser labelling, laser cutting, laser weld etc.
But unstable seed source can produce the high energy pulse of non-signal light through gain fibre amplification, not only bad for processed and applied, also serious threat the safety of even whole laser-processing system of seed source, pumping source can be comprised on the contrary.Secondly, in process, a part for the light reflected by surface of the work can enter laser instrument, may damage device, even burn optical fiber.Moreover at present by the restriction that Primary Component cost is higher, the cost of the industrial pulse optical fiber on market is also very high, also limit the popularization of its application.So, need to have in high stability, high light beam quality, compact conformation, processing and can prevent reverberation and the low pulse optical fiber of cost.
Summary of the invention
The present invention puts in view of the above problems and makes, its object is to provide a kind of stability is high, cost is low and have antireflection light function for industrial processes, the linear polarization pulse fiber laser machining device of all optical fibre structure.
In order to achieve the above object, the invention provides a kind of linear polarization pulse optical fiber laser processing device in full optical fiber structure, comprising: optical fiber laser, for generation of pulse laser; Multiple amplifying stage unit, comprises polarization-dependent isolator respectively, pumping source, polarization is correlated with bundling device and double clad polarization maintaining optical fibre, amplify the linear polarization pulse laser exported by described linear polarization solid state laser; And be configured in polarization relevant collimation isolator, polarizing beam splitter and λ/4 wave plate of final output side of described multiple amplifying stage unit successively, the laser through amplifying exported from described multiple amplifying stage unit is made to be radiated at work piece after described polarization relevant collimation isolator, polarizing beam splitter and λ/4 wave plate, and, reflected by described processed object and the laser that returns along optical axis after the wave plate of described λ/4, its polarization direction becomes vertical with former polarization direction, thus is reflected to the direction vertical with optical axis by described polarizing beam splitter.
In addition, preferably, described optical fiber laser comprises the pumping source, high reflectance fiber grating, doubly clad optical fiber, optical fiber acousto-optic Q-switching, the transmission-type fiber grating that configure successively.
In addition, preferably, entering of the polarization-dependent isolator of the first order amplifying unit in the coupling output optical fiber of described optical fiber laser and described multiple amplifying stage unit is fine by drawing the welding of cone method to realize mould field coupling.
Moreover, preferably, the fiber end face welding adopting mould field to mate between described multiple amplifying stage unit.
In addition, preferably, the polarization of the previous amplifying stage unit in described multiple amplifying stage unit is correlated with the pumping input of bundling device and the relevant bundling device of polarization of a rear amplifying stage unit, is added to fine quantity or improves single armed pump power according to required pumping general power.
According to the present invention as above, can realize that stability is high, cost is low and with the linear polarization pulse fiber laser machining device for industrial processes of anti-reflective function.
Accompanying drawing explanation
Fig. 1 is the integrally-built figure of linear polarization pulse fiber laser machining device representing all optical fibre structure for industrial processes that the present invention relates to.
Fig. 2 is the figure of the internal structure of the optical fiber laser 1 represented in the fiber laser processing apparatus of above-mentioned all optical fibre structure.
Description of reference numerals:
1, optical fiber laser, 2, pre-amplification stage polarization-dependent isolator,
3, pre-amplification stage pumping source, 4, pre-amplification stage polarization is correlated with bundling device,
5, pre-amplification stage double clad polarization maintaining optical fibre, 6, main amplifying stage polarization-dependent isolator,
7, main amplifying stage pumping source, 8, main amplifying stage polarization is correlated with bundling device,
9, main amplifying stage double clad polarization maintaining optical fibre, 10, polarization relevant collimation isolator,
11, polarizing beam splitter, 12, λ/4 wave plate,
13, absorber of light, 14, work piece,
15, pumping source 16, high reflectance fiber grating,
17, doubly clad optical fiber, 18, optical fiber acousto-optic Q-switching
19, transmission-type fiber grating.
Detailed description of the invention
Below, composition graphs 1, Fig. 2 describe the specific embodiment of the present invention in detail.
The figure of Fig. 1 to be integrally-built figure, the Fig. 2 of the linear polarization pulse fiber laser machining device representing all optical fibre structure for industrial processes that the present invention relates to be internal structure of the optical fiber laser 1 represented in the linear polarization pulse fiber laser machining device of above-mentioned all optical fibre structure.
As shown in Figure 1, linear polarization pulse fiber laser machining device of the present embodiment comprises: optical fiber laser 1; To be correlated with the pre-amplification stage unit that bundling device 4 and pre-amplification stage double clad polarization maintaining optical fibre 5 etc. are formed by pre-amplification stage polarization-dependent isolator 2, pre-amplification stage pumping source 3, pre-amplification stage polarization; To be correlated with the main amplifying stage unit that bundling device 8, main amplifying stage double clad polarization maintaining optical fibre 9 etc. are formed by main amplifying stage polarization-dependent isolator 6, main amplifying stage pumping source 7, main amplifying stage polarization; And be connected to polarization relevant collimation isolator 10, polarizing beam splitter 11, λ/4 wave plate 12 and the absorber of light 13 etc. of workpiece side of above-mentioned main amplifying stage unit in turn.
The pulse laser produced by optical fiber laser 1 enters into pre-amplification stage unit.
In this pre-amplification stage unit, above-mentioned linearly polarized laser, after pre-amplification stage polarization-dependent isolator 2, enters pre-amplification stage pumping source 3 and carries out pumping.This pre-amplification stage polarization-dependent isolator 2 allows light pass through to a direction and stop the passive device passed through round about, its effect limits the direct of travel of light, light can only one direction be transmitted, the light of being returned by optical fiber echo reflection can be isolated device isolates well, thus improve the efficiency of transmission of light wave, prevent the harmful effect that the reverse transfers light produced due to a variety of causes in light path produces light source and light path system.
Afterwards, enter pre-amplification stage polarization from the pump light of pre-amplification stage pumping source 3 outgoing to be correlated with bundling device 4.This pre-amplification stage polarization bundling device 4 of being correlated with is a kind of end pumping devices, and it has high coupling efficiency, is convenient to and other optical fibre device forms seamless link, for coupling pump light being entered pre-amplification stage double clad polarization maintaining optical fibre 5.Then, propagate in pre-amplification stage double clad polarization maintaining optical fibre 5 through the be correlated with pump light of bundling device 4 of pre-amplification stage polarization, absorbed by the working-laser material in pre-amplification stage double clad polarization maintaining optical fibre 5 simultaneously and produce one-level amp pulse laser.
Then, the laser produced by above-mentioned pre-amplification stage unit enters main amplifying stage unit.
The formation of main amplifying stage unit is substantially identical with the formation of above-mentioned pre-amplification stage unit, is also to be made up of be correlated with bundling device, double clad polarization maintaining optical fibre etc. of polarization-dependent isolator, pumping source, polarization.In main amplifying stage unit, laser carries out pumping through the laggard amplifying stage pumping source 7 of becoming owner of of main amplifying stage polarization-dependent isolator 6.Wherein, main amplifying stage polarization-dependent isolator 6 allows light pass through to a direction and stop the passive device passed through round about, its effect limits the direction of light, light can only one direction be transmitted, thus enable the light of being returned by optical fiber echo reflection be isolated device to isolate well, improve the efficiency of transmission of light wave, prevent the harmful effect that the reverse transfers light produced due to a variety of causes in light path produces light source and light path system thus.
Afterwards, enter main amplifying stage polarization from the pump light of main amplifying stage pumping source 7 outgoing to be correlated with bundling device 8, this main amplifying stage polarization bundling device 8 of being correlated with is a kind of end pumping devices, it has high coupling efficiency, be convenient to form seamless link, for coupling pump light being entered main amplifying stage double clad polarization maintaining optical fibre 9 with other optical fibre device.Then, propagates in main amplifying stage double clad polarization maintaining optical fibre 9 through the be correlated with pump light of bundling device 8 of this main amplifying stage polarization, this pump light is produced secondary amp pulse laser by the working-laser material absorption in main amplifying stage double clad polarization maintaining optical fibre 9 simultaneously.
Then, after the laser produced enters polarization relevant collimation isolator 10, that is correlated with that the output of collimation isolator 10 obtains from polarization remains linear polarization pulse laser.This polarization relevant collimation isolator 10 is for preventing after gain fibre amplifies reverse transfers light loss bad light source and the light path systems such as issuable high energy pulse.
Afterwards, the linear polarization pulse laser of collimation isolator 10 of being correlated with via polarization, after becoming circularly polarized light successively, Laser Processing is carried out on the surface being radiated at work piece 14 by polarizing beam splitter 11 and λ/4 wave plate 12.In process, the surface reflection Hou Yanyuan road of a part of light work piece 14 returns, and enters λ/4 wave plate 12 successively and becomes linearly polarized light.At this, its polarization direction becomes the direction vertical with former polarization direction, therefore, when it enters polarizing beam splitter 11, is polarized optical splitter 11 and is separated to towards the direction of absorber of light 13, and absorbed by absorber of light 13, thus reach the effect of antireflection light.
In above-mentioned pre-amplification stage unit and main amplifying stage unit, the signal input part phase welding of the output of each polarization-dependent isolator 2,6 bundling device 4,8 relevant to each polarization respectively, further, the pumping of the tail optical fiber bundling device relevant to each polarization 4,8 of each pumping source 3,7 enters fine phase welding.In addition, each polarization is correlated with the output of bundling device 4,8 and one end phase welding of each double clad polarization maintaining optical fibre 5,9.And the other end of pre-amplification stage double clad polarization maintaining optical fibre 6 enters fine phase welding with main amplifying stage polarization-dependent isolator 6; The other end of main amplifying stage double clad polarization maintaining optical fibre 9 is relevant to polarization collimate isolator 10 enter fine phase welding, thus, linear polarization pulse laser can be obtained at the be correlated with output of collimation isolator 10 of polarization.
In addition, the optical fiber at above all weld two ends is all preferably core diameter matched fiber.
Moreover, illustrate linear polarization pulse fiber laser machining device laser being carried out to secondary amplification in the present embodiment, but the present invention does not limit the progression of laser amplifier, multistage structure for amplifying can be selected according to required laser power, wherein, every one-level all can be made up of be correlated with bundling device, pumping source and double clad polarization maintaining optical fibre of polarization-dependent isolator, polarization.
Further, the internal structure of the line polarisation fibre laser 1 in above-mentioned linear polarization pulse fiber laser machining device is illustrated with reference to Fig. 2.
As shown in Figure 2, the optical fiber laser 1 of the seed source unit of pulse optical fiber comprises the pumping source 15, high reflectance fiber grating 16, doubly clad optical fiber 17, optical fiber acousto-optic Q-switching 18 and the transmission-type fiber grating 19 that configure successively as a whole.High reflectance fiber grating 16 and transmission-type fiber grating 19 form resonator, and pumping source 15 provides pump energy for it, and doubly clad optical fiber 17 is gain media, and optical fiber acousto-optic Q-switching 18 to regulate in chamber Q value to produce pulse laser.In addition, the input welding of its output optical fiber of optical fiber laser 1 and pre-amplification stage isolator (2), optical fiber laser 1 is not limited to said structure, as long as can export the optical fiber laser of pulsed light.
In addition, above-mentioned pre-amplification stage pumping source 3 and main amplifying stage pumping source 7 can be the coupling fiber way of outputs.In addition, above-mentioned pre-amplification stage polarization is correlated with the pumping input of bundling device 4 bundling device 8 relevant with main amplifying stage polarization, pumping general power as required can be added to fine quantity or improve single armed pump power.
As mentioned above, according to linear polarization pulse fiber laser machining device of the present invention, the laser of high stability, high light beam quality can be produced, and there is antireflection light function, and low cost of manufacture.
Under above-mentioned instruction of the present invention; those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment; and these improve and distortion; all drop in protection scope of the present invention; it will be understood by those skilled in the art that above-mentioned specific descriptions just better explain object of the present invention, protection scope of the present invention is by claim and equivalents thereof; any change and distortion within the scope of this, all drops within protection scope of the present invention.
Claims (4)
1. a linear polarization pulse optical fiber laser processing device in full optical fiber structure, comprising:
Optical fiber laser, as the seed source unit of laser processing device, for generation of linear polarization pulse laser; Described optical fiber laser comprises the pumping source, high reflectance fiber grating, doubly clad optical fiber, optical fiber acousto-optic Q-switching, the transmission-type fiber grating that configure successively;
Multiple amplifying stage unit, comprises polarization-dependent isolator respectively, pumping source, polarization is correlated with bundling device and double clad polarization maintaining optical fibre, amplify the pulse laser exported by described optical fiber laser;
And be configured in polarization relevant collimation isolator, polarizing beam splitter and λ/4 wave plate of final output side of described multiple amplifying stage unit successively, the laser through amplifying exported from described multiple amplifying stage unit is made to be radiated at work piece after described polarization relevant collimation isolator, polarizing beam splitter and λ/4 wave plate, and, reflected by described work piece and the laser returned along optical axis after the wave plate of described λ/4, its polarization direction becomes vertical with former polarization direction, thus is reflected to the direction vertical with optical axis by described polarizing beam splitter.
2. linear polarization pulse optical fiber laser processing device in full optical fiber structure according to claim 1, wherein,
Entering of the polarization-dependent isolator of the first order amplifying unit in the coupling output optical fiber of described optical fiber laser and described multiple amplifying stage unit is fine by drawing the welding of cone method to realize mould field coupling.
3. linear polarization pulse optical fiber laser processing device in full optical fiber structure according to claim 1, wherein,
The fiber end face welding adopting mould field to mate between described multiple amplifying stage unit.
4. linear polarization pulse optical fiber laser processing device in full optical fiber structure according to claim 1, wherein,
The polarization of the previous amplifying stage unit in described multiple amplifying stage unit is correlated with the pumping input of bundling device and the relevant bundling device of polarization of a rear amplifying stage unit, is added to fine quantity or improves single armed pump power according to required pumping general power.
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| CN201110164672.2A CN102240846B (en) | 2011-06-17 | 2011-06-17 | Linearly polarized pulsed fiber laser processing device with all-fiber structure |
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| CN201110164672.2A CN102240846B (en) | 2011-06-17 | 2011-06-17 | Linearly polarized pulsed fiber laser processing device with all-fiber structure |
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| CN102892585B (en) * | 2012-02-14 | 2015-11-25 | 深圳市杰普特电子技术有限公司 | A kind of pulse laser and pulse laser marking system |
| WO2013139028A1 (en) * | 2012-03-22 | 2013-09-26 | 深圳市杰普特电子技术有限公司 | Pulse optical fibre laser marking system |
| CN111360397A (en) * | 2019-08-14 | 2020-07-03 | 方强 | Dodging optical system based on multiple optical fiber output laser modules and processing head |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969172A (en) * | 2010-08-24 | 2011-02-09 | 浙江大学 | Yb-doped fiber laser based on pulse laser seeds in gain modulation technology |
| CN102055127A (en) * | 2010-11-26 | 2011-05-11 | 山西飞虹激光科技有限公司 | Polarization maintaining optical fibre laser with anti-reflection device |
| CN202240149U (en) * | 2011-06-17 | 2012-05-30 | 山西飞虹激光科技有限公司 | Linear polarization pulse optical fiber laser processing device in full optical fiber structure |
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| US8059334B2 (en) * | 2005-06-06 | 2011-11-15 | Institut National D'optique | Optical fiber amplifier system and method |
| JP5454080B2 (en) * | 2008-10-23 | 2014-03-26 | 住友電気工業株式会社 | Laser processing method and laser processing apparatus |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101969172A (en) * | 2010-08-24 | 2011-02-09 | 浙江大学 | Yb-doped fiber laser based on pulse laser seeds in gain modulation technology |
| CN102055127A (en) * | 2010-11-26 | 2011-05-11 | 山西飞虹激光科技有限公司 | Polarization maintaining optical fibre laser with anti-reflection device |
| CN202240149U (en) * | 2011-06-17 | 2012-05-30 | 山西飞虹激光科技有限公司 | Linear polarization pulse optical fiber laser processing device in full optical fiber structure |
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