CN104793292A - Mixed-parabolic concentrator based optical fiber coupling system - Google Patents
Mixed-parabolic concentrator based optical fiber coupling system Download PDFInfo
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- CN104793292A CN104793292A CN201510204269.6A CN201510204269A CN104793292A CN 104793292 A CN104793292 A CN 104793292A CN 201510204269 A CN201510204269 A CN 201510204269A CN 104793292 A CN104793292 A CN 104793292A
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- fiber
- type condenser
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- compound parabolic
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/264—Optical coupling means with optical elements between opposed fibre ends which perform a function other than beam splitting
Abstract
The invention discloses a mixed-parabolic concentrator based optical fiber coupling system which comprises a low-power semiconductor laser, a conventional multimode fiber, a fiber optic combiner, a multimode fiber, a mixed-parabolic concentrator and an active doped fiber. A traditional lens coupling system is replaced by the non-image optics based parabolic concentrator, collimation and beam expansion are not needed, the spot size of coupled beams is greatly lowered, and efficiency in coupling with the active doped fiber is improved. The system is applicable to pump injection experiments of a fiber laser, and conditions are provided for generation of high-power lasers.
Description
Technical field
The present invention relates to the technical field of high power fiber laser, it is the coupled system that can improve laser pump light injection efficiency.
Background technology
Superpower laser all has a large amount of demands in fields such as industry and military and national defense, in such applications, proposes more and more higher requirement to the efficiency, beam quality, volume, weight etc. of laser instrument.The block structure of conventional solid laser gain medium result in the shortcoming of its radiating effect difference, the thermally induced birefringence produced under high power and thermal lensing effect, is extremely disadvantageous for realizing high-power output.In order to address this problem, people begin one's study surface area greatly, are easy to disc type laser device and the fiber laser of heat radiation.Compare disc type laser device, fiber laser has the advantage of good beam quality, receives the more concern of people.Fiber laser is a kind of novel solid laser instrument, is characterized in using double clad doping with rare-earth ions optical fiber as gain media.Because the characteristic of optical fiber itself, make fiber laser have obvious advantage than other solid state laser, compared with other laser system, optical fiber laser pump efficiency is high, threshold value is low, good heat dissipation, and output beam quality is high, and volume is little, structure is simple, and reliability is high, and dirigibility is strong.These advantages have become Optical Maser System of greatest concern in current world wide.
Because simple optical fiber does not reach the requirement of high-power output, so enter another root optical fiber as coupling pump light after needing to carry out conjunction bundle to many output light with optical fiber, thus generate high power laser.But in order to the beam quality ensured, the fibre core of optical fiber is very thin, and the pumping source closed after bundle is difficult to focus on core.Therefore, need to work out a kind of suitable coupled system, pump light larger for spot size is focused on the core size being compressed to optical fiber, system just can carry out pumping expeditiously, completes the output of high power laser.
Fiber coupling technique experienced by very long developing stage, and according to the difference of actual conditions, coupling fiber has diversified mode to realize.Main employing dialyte lens coupled method and these two kinds of methods of Direct couple method on current overall context.Dialyte lens coupled method: between each optical component of fiber coupling system inside and this coupled system and optical fiber be discrete.Very high co-axial alignment must be reached between each components and parts between optical fiber and optical fiber and in optical fiber and coupled system.Therefore while assembling such coupled system, in order to ensure higher coaxiality, the supporting member that some shapes are special, machining precision is higher usually can be adopted to fix various optical component.But this just makes the relative cost making coupled system higher, and the overall dimensions of coupled system is larger.More common several optical coupling systems be made up of beam splitter have: the coupling of ball-lens coupling, GRIN Lens and compound lens coupling.Direct couple method: there is not any optical component between optical fiber and optical fiber, adopts the method for directly docking or carrying out fiber end face special processing and then docking.Comprising flush end Direct couple and the method to optical fiber processing coupling, becoming spherical as fired by fiber end face, the special shape such as taper is coupled again.Common Direct couple method has: flush end Direct couple method, optical fiber with sphere end direct coupling method, conical fiber direct coupling method and cone end spherical lens direct coupling method.
Affect optical coupling efficiency because have: fiber end face reflection loss, fiber absorption, scattering loss and radiation loss.Wherein reflection loss has the greatest impact, it is mainly reflected in light beam and optical fiber misalignment and causes coupling efficiency and decline, comprise: the longitudinal pitch error of light beam and fiber end face position, the optical axis of light beam and the lateral error of optical axis, the angular error of beam optical axis and optical axis.
Therefore need to develop a kind of coupled system, can solve or improve the low inferior problem of coupling efficiency that existing coupled system causes because of so multiple error, the high power laser realizing fiber laser better exports.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of fiber coupling system based on compound parabolic type condenser, overcomes the shortcoming that the coupling efficiency of pump light and the doped fiber adopting tradition to adopt image optics coupled system to exist is lower.
The technical scheme that the present invention solves the problems of the technologies described above employing is: a kind of fiber coupling system based on compound parabolic type condenser, comprise low-power semiconductor laser, conventional multi-mode fiber, optical-fiber bundling device, multimode optical fiber, compound parabolic type condenser and active doping optical fibre, the compound parabolic type condenser share by doublet in traditional coupled system based on nonimaging optics replaces, the laser beam that multiple LD exports is coupled into multimode optical fiber after optical-fiber bundling device, the emergent light spot size of multimode optical fiber is larger, after compound parabolic type condenser coupled system, spot size is greatly reduced to and matches with the core size of active doping optical fibre, and energy major part concentrates in the numerical aperture angular range of active doping optical fibre, improve coupling efficiency.
Principle of the present invention is: light from 0 ° to a certain maximum angle within the scope of access to plant, after maximum angle is given, all with the light of maximum angle incidence (edge-light) at the edge being just guided to exit portal after maximum primary event, so all can be reflected in exit portal with the light of intermediate angle incidence.So far, the object of pump beam size compression can be realized.The incidence end radial design of compound parabolic type condenser is larger than incident beam radius, which simplify light beam docking, also can eliminate the problem that the coupling efficiency caused by laser beam fails to cover completely on fiber end face declines.Output light and the active doping optical fibre of compound parabolic type condenser carry out vacant terminal face-pumping and are coupled.
The present invention compared with prior art has the following advantages:
1, the present invention does not need to adopt complicated Lens Coupling system.
2, the compound parabolic type concentrator construction that the present invention adopts can make the incident pump guide of the overwhelming majority guide to the exit end of compound parabolic type condenser, and loss is little.
3, the present invention is higher than the coupling efficiency of prior art.
4, structure of the present invention is simple, and existing technique easily realizes.
Accompanying drawing explanation
Fig. 1 is a kind of fiber coupling system based on compound parabolic type condenser;
Fig. 2 is compound parabolic type condenser principle schematic;
Fig. 3 is traditional fiber coupling system based on doublet;
Fig. 4 is the outgoing end face intensity of illumination distribution figure of parabolic type condenser;
Fig. 5 is the outgoing end face surface of intensity distribution of parabolic type condenser;
Fig. 6 is the focal plane intensity of illumination distribution figure of double lens coupled system;
Fig. 7 is the focal plane surface of intensity distribution of double lens coupled system.
In figure: 1: low-power semiconductor laser, 2: conventional multi-mode fiber, 3: optical-fiber bundling device, 4: multimode optical fiber, 5: compound parabolic type condenser, 6: active doping optical fibre, 7: double lens coupled system (collimation lens and condenser lens), 8: double color plate.
Embodiment
The specific embodiment of the invention is illustrated below in conjunction with accompanying drawing.
As shown in Figure 1, the fiber coupling system based on compound parabolic type condenser is made up of low-power semiconductor laser 1, conventional multi-mode fiber 2, optical-fiber bundling device 3, multimode optical fiber 4, compound parabolic type condenser 5, active doping optical fibre 6.Compared with traditional Lens Coupling system, this fiber coupling system adopts the compound parabolic type concentrator construction based on nonimaging optics design.After amplifying as shown in Figure 2, curve B C is the para-curve that focus is positioned at D place to compound parabolic type condenser 5, and dotted line DE is its axis of symmetry, AC//DE.According to parabolical characteristic, all axial light of symmetry being parallel to para-curve BC all can converge to its focus D place.Curve A D and BC is symmetrical, and namely C is the focus of para-curve AD, and BD is parallel to the axis of symmetry of para-curve AD.So in like manner, be parallel to the convergence of rays in BD direction to C point.That is, marginal ray (maximum angle incident ray) is inside reflected after entering compound parabolic type condenser 5, then from edge C, D 2 injection in the outgoing aperture of compound parabolic type condenser 5.The light being parallel to AC or BD is exactly incident marginal ray, as long as the marginal ray of incidence can outgoing, all incident raies (removing absorbs and loss) so between marginal ray all can from outgoing between C, D 2.So far, the object of hot spot compression can be realized.
Adopt structure as shown in Figure 3 in tradition coupling technique, coupled system is lens combination, and because lens are imaging systems, in imaging theory, Abbe sine theorem hnsinU=h'n'sinU' gives the relation between image size and beam divergence angle.Can produce the aberrations such as spherical aberration, off-axis aberration, aberration in image optics, when we want to obtain large focusing ratio, the bore of lens and the ratio of focal length will be large as much as possible, in this case, aberration will be very large, i.e. enable elimination spherical aberration, off-axis aberration but still exists.Light beam after compression, if want to obtain small divergence angle, spot size is just large, if expect small light spot, its angle of divergence must increase.Therefore, with regard to the performance of converging light, any light gathering utilizing the system of image-forming principle optically focused all not reach non-imaging optical system.
Fig. 4 and Fig. 5 be respectively utilize the compound parabolic type condenser of exit end that the incidence end of diameter 5mm and diameter are 1mm to diameter 5mm, numerical aperture be 0.2, after the light beam of total light flux 100W focuses on, the outgoing end face illuminance of condenser and the surface of intensity distribution, the light beam after coupling has energy greatly to concentrate within the scope of small divergence angle.Emergent light is coupled into that numerical aperture is 0.2, the coupling efficiency of the optical fiber of diameter 1mm is 17.1%.
For by f
1=145.4mm, D
1the collimation lens of=50mm and f
2=73.1mm, D
2the double lens coupled system of the condenser lens composition of=52mm, the numerical aperture of the optical fiber injection of diameter 5mm is 0.2, the light of total light flux 100W is after this coupled system, when being coupled into the optical fiber of diameter 1mm, the incidence end light spot illumination figure of 1mm optical fiber and the surface of intensity distribution are as Fig. 6 and Fig. 7, owing to there is aberration, the space distribution of beam energy is dispersed very much, and beam quality is poor.Calculate and only have 4.3194% with the coupling efficiency of optical fiber.Can find out, based on the fiber coupling system of compound parabolic type condenser compared to double lens coupled system, coupling efficiency improves more than 4 times, and continues optimization and can also improve.
A kind of coupled system based on nonimaging optics is mainly used in the coupling pump light injection experiments of high power fiber laser.
The not disclosed in detail part of the present invention belongs to the known technology of this area.
Although be described the illustrative embodiment of the present invention above; so that the technician of this technology neck understands the present invention; but should be clear; the invention is not restricted to the scope of embodiment; to those skilled in the art; as long as various change to limit and in the spirit and scope of the present invention determined, these changes are apparent, and all innovation and creation utilizing the present invention to conceive are all at the row of protection in appended claim.
Claims (2)
1. the fiber coupling system based on compound parabolic type condenser, comprise low-power semiconductor laser (1), conventional multi-mode fiber (2), optical-fiber bundling device (3), multimode optical fiber (4), compound parabolic type condenser (5), active doping optical fibre (6), it is characterized in that: the compound parabolic type condenser (5) share by the doublet in double lens coupled system based on nonimaging optics replaces, the laser beam that multiple LD exports is coupled into multimode optical fiber after optical-fiber bundling device, after compound parabolic type condenser coupled system, spot size is reduced to and matches with the core size of active doping optical fibre, and concentration of energy is in the numerical aperture angular range of active doping optical fibre, improve coupling efficiency.
2. a kind of fiber coupling system based on compound parabolic type condenser according to claim 1, it is characterized in that: compound parabolic type condenser (5), curve B C is the para-curve that focus is positioned at D place, and dotted line DE is its axis of symmetry, AC//DE; According to parabolical characteristic, all axial light of symmetry being parallel to para-curve BC all can converge to its focus D place; Curve A D and BC is symmetrical, and namely C is the focus of para-curve AD, and BD is parallel to the axis of symmetry of para-curve AD; Be parallel to the convergence of rays in BD direction to C point; After entering compound parabolic type condenser (5) with the marginal ray of maximum angle incidence, inside reflected, then from edge C, D 2 injection in the outgoing aperture of compound parabolic type condenser (5); The light being parallel to AC or BD is exactly incident marginal ray, as long as the marginal ray of incidence can outgoing, all incident raies so between marginal ray all from outgoing between C, D, thus can realize the object of hot spot compression at 2.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121770A (en) * | 2017-06-13 | 2017-09-01 | 中国科学院光电技术研究所 | A kind of miniature compound parabolic type concentrator array suitable for focus planar detector |
| CN108169847A (en) * | 2018-03-13 | 2018-06-15 | 杭州艾芯智能科技有限公司 | A kind of large field of view scan imaging optical system |
| CN108196243A (en) * | 2018-03-14 | 2018-06-22 | 北京因泰立科技有限公司 | A kind of 3-D scanning laser radar based on MEMS micromirror |
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Patent Citations (6)
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| CN1217794A (en) * | 1996-02-14 | 1999-05-26 | 遥控源照明国际公司 | Optical coupler |
| KR100852761B1 (en) * | 2008-07-08 | 2008-08-18 | 주식회사 이상테크 | Optical jumper cord and method of manufacturing the same |
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| CN108169847A (en) * | 2018-03-13 | 2018-06-15 | 杭州艾芯智能科技有限公司 | A kind of large field of view scan imaging optical system |
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Application publication date: 20150722 |