CN104218439A - Optical fiber laser system - Google Patents
Optical fiber laser system Download PDFInfo
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- CN104218439A CN104218439A CN201410429693.6A CN201410429693A CN104218439A CN 104218439 A CN104218439 A CN 104218439A CN 201410429693 A CN201410429693 A CN 201410429693A CN 104218439 A CN104218439 A CN 104218439A
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Abstract
The invention provides an optical fiber laser system which comprises a high-reflecting optical fiber grating, an output optical fiber grating and at least one laser module. The laser module comprises a forward pumping source, a backward cladding optical filter, a gain optical fiber, a forward cladding optical filter and a backward pumping source which are sequentially serially connected, wherein the forward pumping source is connected with the high-reflecting optical fiber grating, the backward pumping source is connected with the output optical fiber grating, and the forward cladding optical filter and the backward cladding optical filter can filter a certain proportion of cladding light transmitting along a preset direction in a target optical fiber. The optical fiber laser system has the advantages that the adding location, number, power level of the pumping sources are not constrained by the absorbing capacity of the gain optical fiber, and high pumping capacity and high system power are achieved.
Description
Technical field
The present invention relates to Fiber laser technology field, particularly a kind of fiber laser system.
Background technology
In order to tackle the needs that fiber laser system power is constantly upwards expanded, fiber laser system pumping injection rate must constantly increase.No matter under which type of technical background, all there is an energy limited by closing the mode set pump energies such as bundle.Therefore, how as far as possible many pumpings are injected gain fibre by technological means and become one of subject matter that fiber laser power upwards expands.
The solution of conventional art realizes the double result of pumpage by both-end pumping.But due to the restriction of fiber absorption ability, its assimilation ratio of gain fibre for regular length is fixing.This just means, adopt the total injection of both-end pumping larger, more in the other end remnant pump of gain fibre.This portion of residual pumping is likely direct causes damage to multi-module optical fiber coupler or laser diode.Therefore, increase fiber lengths if do not relied on and solve the remnant pump problem caused after both-end pumping power increases, both-end pumping technology can unrestricted application in laser system.
And solve remnant pump problem will by the means of covering filtering.Current conventional bag metafiltration, except means for add index-matching material outside fiber cladding, destroys the total reflection condition at fiber cladding interface.This cladding light filtering technology is not because it possesses the fiber laser system (when the remnant pump in the some directions of filtering, the meeting unabsorbed pumping in another direction of filtering) that therefore directional selectivity cannot be applied to two directional pump.
Summary of the invention
The present invention is intended to solve one of technical problem in above-mentioned correlation technique at least to a certain extent.
For this reason, the object of the invention is to propose a kind of fiber laser system, this system can make the point of addition of pumping source, quantity, power level all no longer be subject to the restriction of gain fibre absorbability, has higher pumpage and system power.
To achieve these goals, embodiments of the invention propose a kind of fiber laser system, comprising: high anti-fiber grating; Output optical fibre grating; At least one laser module, described laser module comprises the forward pumping source of connecting successively, backward cladding light stripper, gain fibre, forward direction cladding light stripper and backward pump source, wherein, described forward pumping source is connected with the anti-fiber grating of described height, described backward pump source is connected with described output optical fibre grating, and described forward direction cladding light stripper and backward cladding light stripper can carry out a certain proportion of filtering to the cladding light propagated by predetermined direction in target optical fiber.
According to the fiber laser system of the embodiment of the present invention, after pumping total amount is decomposed, the two-way injection main fiber of diverse location in laser system, in addition, introduce cladding light stripper, the restriction making the point of addition of pumping source, quantity, power level all no longer be subject to gain fibre absorbability has higher pumpage and system power.Simultaneously, the unidirectional cladding light stripper with directional selectivity is added in system, thus the issuable pressure interacting and multimode fiber bundling device is produced of two directional pump can be avoided, also can remove the remnant pump corresponding to the bolus injection pumping on each direction and cladding light.
In addition, fiber laser system according to the above embodiment of the present invention can also have following additional technical characteristic:
In some instances, at least one laser module described is multiple, and described multiple laser module is connected successively.
In some instances, described multiple laser module comprises the first to the 3rd laser module, the forward pumping source of described first laser module is connected with the anti-fiber grating of described height, the backward pump source of described first laser module is connected with the forward pumping source of described second laser module, the backward pump source of described second laser module is connected with the forward pumping source of described 3rd laser module, and the backward pump source of described 3rd laser module is connected with described output optical fibre grating.
In some instances, be connected by Transmission Fibers between described multiple laser module.
In some instances, described forward pumping source or described backward pump source can be coupled into described fiber laser system by holding the mode of pump from the two ends of gain module, also can be coupled into described fiber laser system by the predetermined point of the multi-module optical fiber coupler with signal path in gain module.
In some instances, described backward cladding light stripper and described forward direction cladding light stripper are arranged in relative to gain fibre after the dominant absorption length of each pumping source.
In some instances, the filtering direction of described backward cladding light stripper is the direction pointing to the anti-fiber grating of described height.
In some instances, also the filtering direction of described forward direction cladding light stripper is the direction pointing to described output optical fibre grating.
Additional aspect of the present invention and advantage will part provide in the following description, and part will become obvious from the following description, or be recognized by practice of the present invention.
Accompanying drawing explanation
Above-mentioned and/or additional aspect of the present invention and advantage will become obvious and easy understand from accompanying drawing below combining to the description of embodiment, wherein:
Fig. 1 is the structural representation of fiber laser system according to an embodiment of the invention.
Embodiment
Be described below in detail embodiments of the invention, the example of described embodiment is shown in the drawings, and wherein same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Being exemplary below by the embodiment be described with reference to the drawings, only for explaining the present invention, and can not limitation of the present invention being interpreted as.
Describe according to the optical fiber of the embodiment of the present invention and the formation method of optical fiber below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of fiber laser system according to an embodiment of the invention.As shown in Figure 1, fiber laser system (not shown) according to an embodiment of the invention, comprising: high anti-fiber grating 1, output optical fibre grating 19 and at least one laser module.Wherein, high anti-fiber grating 1, output optical fibre grating 19 and the gain fibre between it form laser oscillation cavity.
Specifically, laser module comprises the forward pumping source of connecting successively, backward cladding light stripper, gain fibre, forward direction cladding light stripper and backward pump source, wherein, forward pumping source is connected with the anti-fiber grating 1 of height, and backward pump source is connected with output optical fibre grating 19.Forward direction cladding light stripper and backward cladding light stripper can carry out a certain proportion of filtering to the cladding light propagated by predetermined direction (as a certain specific direction) in target optical fiber, affect the cladding light that another direction is propagated hardly simultaneously.More specifically, in one embodiment of the invention, at least one laser module is multiple, and this multiple laser module is connected successively, and multiple laser module is connected by Transmission Fibers.
In one particular embodiment of the present invention, as shown in Figure 1, laser module is three, is respectively the first to the 3rd laser module be connected successively by Transmission Fibers.Wherein, as shown in Figure 1, first laser module is made up of the forward pumping source 2 of connecting successively, backward cladding light stripper 5, gain fibre 4, forward direction cladding light stripper 6 and backward pump source 3, and forward pumping source 2 is connected with the anti-fiber grating 1 of height, backward pump source 3 is connected with forward pumping source 8 with by Transmission Fibers 7.Second laser module is made up of the forward pumping source 8 of connecting successively, backward cladding light stripper 9, gain fibre 10, forward direction cladding light stripper 11 and backward pump source 12, and forward pumping source 8 is connected by Transmission Fibers with backward pump source 3, backward pump source 12 is connected with forward pumping source 14 with by Transmission Fibers 13.3rd laser module is made up of the forward pumping source 14 of connecting successively, backward cladding light stripper 15, gain fibre 16, forward direction cladding light stripper 17 and backward pump source 18, and forward pumping source 14 is connected by Transmission Fibers 13 with backward pump source 12, backward pump source 18 is connected with output optical fibre grating 19.Wherein, in the examples described above, the pumping that provides of gain fibre 4 absorptive pumping source 2 and pumping source 3 is to form the first laser module.The pumping that gain fibre 10 absorptive pumping source 8 and pumping source 12 provide is to form the second laser module.The pumping that gain fibre 16 absorptive pumping source 14 and pumping source 18 provide is to form the 3rd laser module.
In addition, in one embodiment of the invention, the filtering direction of backward cladding light stripper is the direction pointing to the anti-fiber grating of described height, and the filtering direction of forward direction cladding light stripper is the direction pointing to described output optical fibre grating.In other words, the filtering direction of the backward cladding light stripper 5 namely shown in Fig. 1, backward cladding light stripper 9 and backward cladding light stripper 15 is the direction pointing to high anti-fiber grating, namely for pointing to the cladding light propagated in high anti-fiber grating 1 direction along output optical fibre grating 19, there is filtering ability, and the cladding light of its backpropagation is not affected.The filtering direction of forward direction cladding light stripper 6, forward direction cladding light stripper 11 and forward direction cladding light stripper 17 is the direction pointing to output optical fibre grating 19, namely for pointing to the cladding light propagated in output optical fibre grating 19 direction along the anti-fiber grating 1 of height, there is filtering ability, and the cladding light of its backpropagation is not affected.And then owing to introducing cladding light stripper, make the point of addition of pumping source, quantity, power level all no longer be subject to the restriction of gain fibre absorbability.In addition, unidirectional cladding light stripper can avoid the issuable pressure interacting and produce multimode fiber bundling device of bi-directional distributed pumping, also can remove the remnant pump corresponding to the bolus injection pumping on each direction and cladding light.
Further, in a specific embodiment, backward cladding light stripper and forward direction cladding light stripper are arranged in relative to gain fibre after the dominant absorption length of each pumping source.
In one embodiment of the invention, forward pumping source or backward pump source can be coupled into fiber laser system by holding the mode of pump from the two ends of gain module, also can be coupled into fiber laser system by the predetermined point of the multi-module optical fiber coupler with signal path in gain module.More specifically, in the examples described above, Shu Ercheng is closed by multi-module optical fiber coupler in forward pumping source 2,8,14 or backward pump source 3,12,18.In other words, namely by multi-module optical fiber coupler, multichannel pumping combiner is injected main fiber to be formed.More specifically, Laser output fiber grating 19 is all pointed in the pumping direction of propagation that forward pumping source 2,8,14 is injected, and the high anti-fiber grating 1 of laser is all pointed in the pumping direction of propagation that backward pump source 3,12,18 is injected.Thus achieve the two-way injection main fiber of diverse location in laser system, significantly improve pumpage and the system power of system.
The fiber laser system above-mentioned to the present invention below in conjunction with Fig. 1 carries out systematic description.
Specifically, in one example, shown in composition graphs 1, fiber laser system of the present invention mainly can be divided into gain module, pump module, Transmission Fibers and filtering module.Further, this fiber laser system can be laser oscillation system, also can be laser amplifier system.
Specifically, for fiber oscillator system, gain module comprises the gain fibre of a pair fiber grating and the one or some certain length connected.For optical fiber amplification system, gain module comprises the gain fibre of the one or some certain length connected, wherein, above-mentioned connection can be realized by the welding between gain fibre, also can be realized with Transmission Fibers welding respectively by two gain fibres.
Pump module can be coupled into laser system by holding the mode of pump from the two ends of gain module, also can be coupled into laser system by a certain predetermined point of the multi-module optical fiber coupler with signal path in gain module.
Filtering module can comprise multiple unidirectional cladding light stripper, and unidirectional cladding light stripper can carry out a certain proportion of filtering to the cladding light propagated by some specific directions in target optical fiber, affects the cladding light that another direction is propagated hardly simultaneously.
In addition, this fiber laser system has the mutual independently pump module of many groups, often organize in independently pump module to comprise and one or morely close the pumping source after bundle by multi-module optical fiber coupler, often organize the gain fibre that pump module is a certain section of length-specific and carry out the pump energy that laser conversion provides necessity, and often the gain fibre section of group corresponding to pump module does not overlap in laser gain system.Specifically, in group, the gain fibre end points far away apart from this pumping decanting point is pointed in the direction of each pumping source injection gain fibre.Often organizing pump module in addition can also comprise some to pumping source in opposite directions, in the gain fibre of its correspondence, there is the pump energy of both direction transmission simultaneously.
Further, in the gain fibre that the often group pump module of above-mentioned filtering module in this fiber laser system is corresponding with it, all configure a pair unidirectional cladding light stripper, this a pair unidirectional cladding light filtering is distributed within two pumping sources of this group pump module inner side, and the remnant pump that in its group of each unidirectional cladding light stripper filtering, all pumping sources of offside absorb through gain fibre and cladding light, its filtering direction is by the direction of the pumping source sensing of its correspondence relative to this pumping source gain fibre far-end end points, each unidirectional cladding light stripper is arranged in relative to gain fibre after the dominant absorption length of each pumping source.Filtering module can clear up the cladding light often organizing pump module remnant pump and generation after the gain fibre corresponding with it, avoids these energy to enter the pumping source of offside in group by modes such as couplings, avoids outside remnant pump and cladding light spilling group simultaneously.
In addition, if above-mentioned fiber laser system is fiber oscillator system, then the part of its gain module within a pair fiber grating can be made up of several above-mentioned pumping block coupled in series.If above-mentioned fiber laser system is optical fiber amplification system, then its gain module can be made up of several above-mentioned pumping block coupled in series.
In addition, it should be noted that, in some concrete examples, this fiber laser system, on whole fiber lengths, according to two different directions of optical transport, all may be divided equally energy pressure, thermal pressure etc. that pumping is injected, can avoid producing other side effect.
According to the fiber laser system of the embodiment of the present invention, after pumping total amount is decomposed, the two-way injection main fiber of diverse location in laser system, in addition, introduce cladding light stripper, the restriction making the point of addition of pumping source, quantity, power level all no longer be subject to gain fibre absorbability has higher pumpage and system power.Simultaneously, the unidirectional cladding light stripper with directional selectivity is added in system, thus the issuable pressure interacting and multimode fiber bundling device is produced of two directional pump can be avoided, also can remove the remnant pump corresponding to the bolus injection pumping on each direction and cladding light.
In describing the invention, it will be appreciated that, term " " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", " on ", D score, " front ", " afterwards ", " left side ", " right side ", " vertically ", " level ", " top ", " end " " interior ", " outward ", " clockwise ", " counterclockwise ", " axis ", " radial direction ", orientation or the position relationship of the instruction such as " circumference " are based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore limitation of the present invention can not be interpreted as.
In addition, term " first ", " second " only for describing object, and can not be interpreted as instruction or hint relative importance or imply the quantity indicating indicated technical characteristic.Thus, be limited with " first ", the feature of " second " can express or impliedly comprise at least one this feature.In describing the invention, the implication of " multiple " is at least two, such as two, three etc., unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, the term such as term " installation ", " being connected ", " connection ", " fixing " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or integral; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals or the interaction relationship of two elements, unless otherwise clear and definite restriction.For the ordinary skill in the art, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be that the first and second features directly contact, or the first and second features are by intermediary indirect contact.And, fisrt feature second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " below " and " below " can be fisrt feature immediately below second feature or tiltedly below, or only represent that fisrt feature level height is less than second feature.
In the description of this specification, specific features, structure, material or feature that the description of reference term " embodiment ", " some embodiments ", " example ", " concrete example " or " some examples " etc. means to describe in conjunction with this embodiment or example are contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not must for be identical embodiment or example.And the specific features of description, structure, material or feature can combine in one or more embodiment in office or example in an appropriate manner.In addition, when not conflicting, the feature of the different embodiment described in this specification or example and different embodiment or example can carry out combining and combining by those skilled in the art.
Although illustrate and describe embodiments of the invention above, be understandable that, above-described embodiment is exemplary, can not be interpreted as limitation of the present invention, and those of ordinary skill in the art can change above-described embodiment within the scope of the invention, revises, replace and modification.
Claims (8)
1. a fiber laser system, is characterized in that, comprising:
High anti-fiber grating;
Output optical fibre grating;
At least one laser module, described laser module comprises the forward pumping source of connecting successively, backward cladding light stripper, gain fibre, forward direction cladding light stripper and backward pump source, wherein, described forward pumping source is connected with the anti-fiber grating of described height, described backward pump source is connected with described output optical fibre grating, and described forward direction cladding light stripper and backward cladding light stripper can carry out a certain proportion of filtering to the cladding light propagated by predetermined direction in target optical fiber.
2. fiber laser system according to claim 1, is characterized in that, at least one laser module described is multiple, and described multiple laser module is connected successively.
3. fiber laser system according to claim 2, it is characterized in that, described multiple laser module comprises the first to the 3rd laser module, the forward pumping source of described first laser module is connected with the anti-fiber grating of described height, the backward pump source of described first laser module is connected with the forward pumping source of described second laser module, the backward pump source of described second laser module is connected with the forward pumping source of described 3rd laser module, and the backward pump source of described 3rd laser module is connected with described output optical fibre grating.
4. the fiber laser system according to Claims 2 or 3, is characterized in that, is connected between described multiple laser module by Transmission Fibers.
5. the fiber laser system according to any one of claim 1-4, it is characterized in that, described forward pumping source or described backward pump source can be coupled into described fiber laser system by holding the mode of pump from the two ends of gain module, also can be coupled into described fiber laser system by the predetermined point of the multi-module optical fiber coupler with signal path in gain module.
6. fiber laser system according to claim 1, is characterized in that, described backward cladding light stripper and described forward direction cladding light stripper are arranged in relative to gain fibre after the dominant absorption length of each pumping source.
7. fiber laser system according to claim 1, is characterized in that, the filtering direction of described backward cladding light stripper is the direction pointing to the anti-fiber grating of described height.
8. fiber laser system according to claim 1, is characterized in that, the filtering direction of described forward direction cladding light stripper is the direction pointing to described output optical fibre grating.
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| CN201410429693.6A CN104218439A (en) | 2014-08-27 | 2014-08-27 | Optical fiber laser system |
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| CN201410429693.6A CN104218439A (en) | 2014-08-27 | 2014-08-27 | Optical fiber laser system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110073557A (en) * | 2016-10-13 | 2019-07-30 | 恩耐公司 | Series connection pumping optical fiber amplifier |
| CN110311294A (en) * | 2019-08-09 | 2019-10-08 | 北京东方锐镭科技有限公司 | Optical fiber laser |
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| US5640268A (en) * | 1995-02-28 | 1997-06-17 | Alcatel N.V. | Optical fiber amplifier with two directional pumping |
| EP1073166A2 (en) * | 1999-07-22 | 2001-01-31 | Samsung Electronics Co., Ltd. | L-band optical fiber amplifier using feedback loop |
| CN101478112A (en) * | 2009-01-06 | 2009-07-08 | 广州中国科学院工业技术研究院 | Optical fiber laser pump protecting apparatus and method |
| CN102201642A (en) * | 2011-04-20 | 2011-09-28 | 深圳市大族激光科技股份有限公司 | Method for protecting pumping source of optical device |
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2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5640268A (en) * | 1995-02-28 | 1997-06-17 | Alcatel N.V. | Optical fiber amplifier with two directional pumping |
| EP1073166A2 (en) * | 1999-07-22 | 2001-01-31 | Samsung Electronics Co., Ltd. | L-band optical fiber amplifier using feedback loop |
| CN101478112A (en) * | 2009-01-06 | 2009-07-08 | 广州中国科学院工业技术研究院 | Optical fiber laser pump protecting apparatus and method |
| CN102201642A (en) * | 2011-04-20 | 2011-09-28 | 深圳市大族激光科技股份有限公司 | Method for protecting pumping source of optical device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110073557A (en) * | 2016-10-13 | 2019-07-30 | 恩耐公司 | Series connection pumping optical fiber amplifier |
| CN110073557B (en) * | 2016-10-13 | 2021-05-11 | 恩耐公司 | Tandem pumping optical fiber amplifier |
| CN110311294A (en) * | 2019-08-09 | 2019-10-08 | 北京东方锐镭科技有限公司 | Optical fiber laser |
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