CN1584644A - Beam shaping optical fibre - Google Patents
Beam shaping optical fibre Download PDFInfo
- Publication number
- CN1584644A CN1584644A CN 200410024873 CN200410024873A CN1584644A CN 1584644 A CN1584644 A CN 1584644A CN 200410024873 CN200410024873 CN 200410024873 CN 200410024873 A CN200410024873 A CN 200410024873A CN 1584644 A CN1584644 A CN 1584644A
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- core region
- optical fiber
- refractive index
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- beam shaping
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Abstract
A light beam reshaping optical fibre consists of fibre core region and cladding region. It is featured as setting core region shape as the same to light spot shape, filling external core region with high refractivity material and internal with low refractivity material, filling internal cladding region with material having lower refractivity than the one used at internal core region and external cladding region with material having more lower refractivity.
Description
Technical field
The present invention relates to a kind of optical waveguide structure, especially a kind of beam shaping optical fiber that can be applicable to the laser shaping system.
Background technology
Laser beam with special shape and special light field distribution has important use at the aspects such as capacity usage ratio of photochemical reaction, material structure modification and raising laser instrument, is a current important research field.In existing laser shaping technology, usually adopt methods such as hard-edge or soft marginal ray hurdle, mask, spatial modulator to obtain to have the laser beam of special shape and special light field distribution, though these methods can satisfy people's requirement to a certain extent, but still have deficiency, it is serious that the common drawback that their exist is that the spatial characteristics of the laser light field of orthopedic systems output is imported the influence that the spatial characteristics of laser light field changes, cause their shaping capability and job stability all undesirable, thereby can't satisfy all kinds of requirement of actual application fully.
The leaded light principle of ordinary optic fibre waveguide is total internal reflection, and it utilizes the principle of total internal reflection that light is constrained in its interface, and the guiding light wave advances along the shaft axis of optic fibre direction.The transport property of this type optical fiber is by its structure and material decision, irrelevant with the optical field distribution characteristic of input laser, therefore cause utilizing optical fiber that beam shaping is had a distinct advantages: promptly: it is little that the shaping result of light beam is imported the influence that laser characteristics changes, and the stability of shaping capability and shaping work is high.In the document available research achievements, the basic structure of optical fiber is made up of two parts, and internal layer is a core region, and skin is a clad region, and the refractive index ratio cladding region refractive index of core region is big slightly, so that light is constrained in core region and transmission forward.This type optical fiber is because near the refractive index the axle center is big, the laser light field that causes fiber-optic output is at horizontal skewness, be Gauss or nearly Gauss's shape distribution, can't export the laser beam of middle part flat-top or medial recess shape, therefore also be difficult to be applied to fields such as laser shaping and beam uniformity.
Summary of the invention
The technical problem to be solved in the present invention is to overcome the deficiency of above-mentioned existing ordinary optic fibre, a kind of beam shaping optical fiber that can be used for the laser shaping system is provided, to obtain to have special shape, and optical field distribution satisfies the laser beam of particular requirement, utilize this optical fiber not only can be easily the input laser shaping to be become middle part flat-top or output intensity edge height, middle low shape, and the shaping characteristic of light beam is not imported the influence of laser light field characteristic variations, the stability height.It has important application in the gain of laser shaping, beam uniformity, the compensation laser amplifier fields such as fiber laser that side effect and design have special light field output of collapsing.
Technical solution of the present invention is as follows:
A kind of beam shaping optical fiber, comprise core region and clad region, the shape that it is characterized in that described core region is consistent with the shape of optical fiber output facula, form by interior core region and outer core region, clad region is made up of inner cladding region and outer cladding region, and the outer core region of optical fiber is filled high-index material, and interior core region is formed by low-index material, the refractive index of core region material therefor in the refractive index of inner cladding region material therefor is generally less than, outer cladding region is formed by the material of low-refraction more.
The geometric configuration of core region is identical with the geometric configuration of outer core region and inner cladding region in described.
The size of core region is less than the size of outer core region in described.
The refractive index of core region packing material is between the refractive index of the refractive index of outer core region material therefor and surrounding layer material therefor in described.
Core region is filled the equally distributed material of refractive index in described.
Core region is filled the material that refractive index changes in gradient or step changes in described in cross section of optic fibre.
The refractive index of core region packing material size is relevant with the refractive index size of core region size, outer core region and clad region material therefor in described.
The shape of cross section of core region is circular or polygon or other well-regulated geometric configuration in described.
The size that changes described interior core region can obtain single-mode fiber or multimode optical fiber.
Description of drawings
Fig. 1 is the cross section of optic fibre synoptic diagram of first embodiment of the invention.
Fig. 2 is the cross section of optic fibre synoptic diagram of second embodiment of the invention.
Fig. 3 is the cross section of optic fibre synoptic diagram of third embodiment of the invention.
Fig. 4 is the cross section of optic fibre synoptic diagram of fourth embodiment of the invention.
Fig. 5 is the cross section of optic fibre synoptic diagram of fifth embodiment of the invention.
Fig. 6 is near laser light field the three-dimensional distribution plan core region of optical fiber shown in Figure 1 when the output flat top beam.
Near the three-dimensional distribution plan of laser light field core region when Fig. 7 is an optical fiber shown in Figure 1 at the output middle part than the light beam of marginal trough 5%.
Four width of cloth figure among Fig. 8 represent the plane figure by the laser light field of triangular in shape, square, the rhombus of difference of embodiment 2,3,4 and 5 outputs and the distribution of regular hexagon shape respectively.
Fig. 9 for a change interior core region size of optical fiber shown in Figure 1 is respectively r
Core1=0.2r
Core2, r
Core1=0.4r
Core2And r
Core1=0.6r
Core2Situation under, the one dimension flat-top optical field distribution figure that obtains in fiber-optic output x direction.
Figure 10 represents optical fiber shown in Figure 1 when the output flat top beam, interior core region refractive index n
Core1, outer core region refractive index n
Core2, the inner cladding region refractive index n
Clad1, the inner cladding region refractive index n
Clad2And optical fiber effective refractive index n
EffWith interior core region external radius r
Core1Variation and relation (the outer core region external radius r that changes
Core2=3 μ m fill quartz material).
Figure 11 represents optical fiber shown in Figure 1 when the output flat top beam, interior core region refractive index n
Core1, outer core region refractive index n
Core2, the inner cladding region refractive index n
Clad1, the inner cladding region refractive index n
Clad2And optical fiber effective refractive index n
EffRelation (the outer core region external radius r that changes with the variation of laser wavelength lambda
Core2=3 μ m fill quartz material).
When Figure 12 is illustrated in the output flat top beam, the mould parameter V of optical fiber shown in Figure 1
EffWith interior core region external radius r
Core1Relation (the outer core region external radius r that changes and change
Core2=3 μ m fill quartz material).
Figure 13 is the cross section of optic fibre synoptic diagram of sixth embodiment of the invention.
Embodiment
Fig. 1 to Fig. 5 has provided the cross section of optic fibre synoptic diagram of five embodiment of the present invention, and they all comprise core region 2,3 and clad region 4,5, and described core region is made up of interior core region 2 and outer core region 3, and clad region is made up of inner cladding region 4 and outer cladding region 5.The shape of the xsect of core region 2,3 and inner cladding region 4 is consistent with the light spot shape that optical fiber 1 will be exported laser, is respectively circle, equilateral triangle, square, rhombus and regular hexagon.Outer cladding region holds optical fiber, makes the optical fiber external diameter rounded (annotate: owing to this kind reason, the outer cladding region 5 among the embodiment 1 can omit) of output difformity hot spot.The outer core region 3 of this optical fiber is filled high-index materials, and interior core region 2 is formed by low-index material, and the refractive index of inner cladding region 4 material therefors is generally less than the refractive index of interior core region 2, and outer cladding region 5 is formed by the material of low-refraction more.In this optical fiber, interior core region 2 plays the effect of defective at core region, and the form of middle part flat-top or medial recess is transmitted and its light field distribution shaping is become to direct light in optical fiber.It carries out shaping to light beam is to realize by the refractive index that changes the core region material therefor, and the factors such as refractive index size of it and core region size and outer cladding region are relevant.
Fig. 6 and Fig. 7 have provided the optical field distribution stereographic map of embodiment 1 described optical fiber when the laser of output flat-top laser and medial recess respectively, and the optical fiber that their explanations utilize the present invention to provide can become laser beam reshaping the form of middle part flat-top or medial recess.
Fig. 8 has further demonstrated the effect when utilizing optical fiber of the present invention that beam shaping is become equilateral triangle, square, rhombus and hexagon.Its explanation is as long as the shape of appropriate design core region and outer cladding region just can utilize optical fiber of the present invention that laser beam reshaping is become regular geometric configuration, and light beam middle part flat-top or depression.
Fig. 9 explanation is in the light beam after the optical fiber shaping of the present invention, the part of middle part flat-top or depression shared scale in light beam is relevant with the size of interior core region 2, if it is big more that the external diameter of interior core region 2 is compared with the external diameter of outer core region 3, the part of flat-top or depression is just many more in the light beam.Also find in addition, if the refractive index of the refractive index of outer core region 3 and clad region 4,5 differs big more, the flat top beam that shaping goes out rising edge and negative edge in the horizontal is just precipitous more, and this point can be used to beam shaping is become laterally be the Gauss or the form of this distribution of same order superelevation not.
Optical fiber of the present invention comes beam shaping by fill the fiber optic materials with appropriate index size in interior core region 2.The refractive index size of 2 packing materials of interior core region is relevant with the refractive index size in other floor district of optical fiber, and this point can be illustrated by Figure 10 and Figure 11, and is specific as follows:
Figure 10 is the refractive index n of core region 3 outside
Core2Fixing, the refractive index n of inner cladding region 4
Clad1Refractive index n with surrounding layer 5
Clad2And n
Core2Differ respectively under 1/300 and 1/150 the situation, described when allowing optical fiber output circular flat laser, relation between the effective refractive index of the refractive index of the required packing material of core region and the size of interior core region and optical fiber, its explanation is when the size of interior core region 2 increases gradually, it is just big more that the refractive index of the refractive index of interior core region 2 required packing materials and 3 packing materials of outer core region differs, and the refractive index of 2 packing materials of core region was greater than the effective refractive index of optical fiber in it also illustrated simultaneously.The refractive index of 2 packing materials of interior core region and the variation relation between the wavelength are provided by Figure 11, and its explanation wavelength is long more, and it is just big more that the refractive index of the refractive index of interior core region 2 and outer core region 3 differs.Figure 10 and Figure 11 are the important evidence of making beam shaping optical fiber of the present invention.
Figure 12 illustrates the mould parameter V of optical fiber of the present invention
EffIncrease with the physical dimension of core region in the optical fiber 2 becomes greatly, and therefore, outside under the fixing situation of the refractive index of core region 3 and clad region 4,5, the refractive index size by core region 2 in regulating can become single-mode fiber or multimode optical fiber to such optical fiber designs.
Also be necessary explanation at last: this instructions is equally applicable to other embodiment situation that the present invention provides at optic fibre characteristic and implementation information that embodiment 1 provides; In addition, if design the laser of optical fiber by its output light field medial recess, then optic fibre characteristic is observed characteristics and the Changing Pattern that Fig. 6 to Figure 12 provides equally.
For further specifying the feasibility of making optical fiber of the present invention, quantize to illustrate the structural parameters of this type optical fiber below in conjunction with the sixth embodiment of the present invention and Figure 13.
What Figure 13 described is the beam shaping optical fiber that can export the equilateral triangle hot spot, and the interior core region 2 of this optical fiber, outer core region 3 and inner cladding region 4 all are equilateral triangle.The rule that provides according to the present invention, if the length of side of core region 2 equals 3.2 μ m in getting, the 4 μ m such as the length of side of outer core region 3, the length of side of inner cladding region 4 equals 10 μ m, fill respectively under the situation that refractive index is 1.44133,1.44963,1.44238 and 1.43517 (each layer refractive index size differs and is no more than 1%) at interior core region 2, outer core region 3, inner cladding region 4 and outer cladding region 5, can allow this optical fiber export the shaping light beam of nearly equilateral triangle distribution and middle part flat-top at the 1064nm place; And fill respectively under the situation that refractive index is 1.44021,1.44963,1.44238 and 1.43517 (each layer refractive index size differs and is no more than 1%) at interior core region 2, outer core region 3, inner cladding region 4 and outer cladding region 5, can allow this optical fiber the nearly triangle of 1064nm place output distribute and the middle part than the shaping light beam of marginal trough 5%.Comprehensive above-mentioned two kinds of situations, when as seen designing beam shaping optical fiber of the present invention, the refractive index size of each layer of optical fiber institute packing material can be controlled at and differ each other within 1% the scope of being no more than.And well-known, the increase and decrease of quartz glass refractive index can be regulated by the method that increases different dopant, as increasing ZrO
2, TiO
2, Al
2O
3, GeO
2, P
2O
5Deng raw material the refractive index of quartz glass is increased, and increase B
2O
3, F then can make the refractive index of quartz glass reduce.Utilize existing manufacture craft, can realize refraction index changing amount of the present invention, thereby produce beam shaping optical fiber.
In addition, more particularly, if the periphery at core region 2 or core region 2 and core region 2 is filled gain medium, other fiber optic materials that corresponding filling of other parts and core region material therefor are complementary, then utilize the present invention just can design output facula and have special shape, and the fiber laser of middle part flat-top or medial recess and amplifier, this has important use in Laser Devices and optical communication field.
Claims (9)
1. a beam shaping optical fiber (1), comprise core region (2,3) and clad region (4,5), it is characterized in that described core region (2,3) shape is general consistent with the shape of optical fiber output facula, form by interior core region (2) and outer core region (3), clad region (4,5) form by inner cladding region (4) and outer cladding region (5), the outer core region (3) of this optical fiber is filled high-index material, interior core region (2) is formed by low-index material, the refractive index of inner cladding region (4) material therefor is generally less than the refractive index of interior core region (2), and surrounding layer (5) is formed by the material of low-refraction more.
2. beam shaping optical fiber according to claim 1 is characterized in that the geometric configuration of described interior core region (2) is identical with the geometric configuration of outer core region (3) and inner cladding region (4).
3. beam shaping optical fiber according to claim 1 is characterized in that the physical dimension of the physical dimension of described interior core region (2) less than outer core region (3).
4. beam shaping optical fiber according to claim 3, it is characterized in that described in the refractive index of core region (2) packing material be between the refractive index of the refractive index of outer core region (3) material therefor and surrounding layer (5) material therefor.
5. beam shaping optical fiber according to claim 4 is characterized in that the equally distributed material of described interior core region (2) filling refractive index.
6. beam shaping optical fiber according to claim 4 is characterized in that the refractive index of described interior core region (2) packing material changes or the step variation in gradient in cross section of optic fibre.
7. beam shaping optical fiber according to claim 4 is characterized in that the refractive index size of described interior core region (2) packing material is relevant with the refractive index size of core region size, outer core region (3) and clad region (4,5) material therefor.
8. beam shaping optical fiber according to claim 1 is characterized in that the cross sectional shape of described interior core region (2) is circular or polygon or other well-regulated geometric configuration.
9. beam shaping optical fiber according to claim 1 is characterized in that changing described interior core region size and can obtain single-mode fiber or multimode optical fiber.
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| CN 200410024873 CN1584644A (en) | 2004-06-02 | 2004-06-02 | Beam shaping optical fibre |
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|---|---|---|---|
| CN 200410024873 CN1584644A (en) | 2004-06-02 | 2004-06-02 | Beam shaping optical fibre |
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Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102023334A (en) * | 2010-12-15 | 2011-04-20 | 江苏大学 | Large-mode field fiber |
| CN102116897A (en) * | 2011-03-04 | 2011-07-06 | 北京交通大学 | Cladded pumping optical fiber capable of efficiently adsorbing pumping light |
| CN103018820A (en) * | 2012-12-28 | 2013-04-03 | 江苏大学 | Flat-top optical fiber |
| CN103063640A (en) * | 2012-12-28 | 2013-04-24 | 西北核技术研究所 | Laser-induced fluorescence combustion field parameter measuring device |
| CN106908894A (en) * | 2017-03-23 | 2017-06-30 | 燕山大学 | A kind of dispersion flattene consolidates microstructured optical fibers entirely |
| CN107003474A (en) * | 2014-10-23 | 2017-08-01 | 科拉克蒂夫高科技公司 | With beam shaping component, fiber component |
| CN107678086A (en) * | 2017-08-31 | 2018-02-09 | 北京航天控制仪器研究所 | A kind of optical fiber for realizing that Gauss beam reshaping is one-dimensional flat top beam |
| CN107924023A (en) * | 2015-07-08 | 2018-04-17 | 恩耐公司 | With the suppressed fiber of the refractive index of the centre for increased Beam parameter product |
| CN107971630A (en) * | 2016-10-21 | 2018-05-01 | 深圳市硕德激光技术有限公司 | A kind of method and laser-processing system for producing the hot spot with special light distribution |
| CN108613137A (en) * | 2018-05-31 | 2018-10-02 | 广州赛西标准检测研究院有限公司 | LED light-guiding pillars and light-conducting system |
| CN109445019A (en) * | 2018-11-02 | 2019-03-08 | 北京大学 | A kind of rectangle core structure optical fiber |
| CN109642981A (en) * | 2016-02-05 | 2019-04-16 | 纽弗恩 | Mode mixture optical fiber and the method and system for using it |
| US10656330B2 (en) | 2016-09-29 | 2020-05-19 | Nlight, Inc. | Use of variable beam parameters to control solidification of a material |
| US10673198B2 (en) | 2016-09-29 | 2020-06-02 | Nlight, Inc. | Fiber-coupled laser with time varying beam characteristics |
| US10673199B2 (en) | 2016-09-29 | 2020-06-02 | Nlight, Inc. | Fiber-based saturable absorber |
| US10673197B2 (en) | 2016-09-29 | 2020-06-02 | Nlight, Inc. | Fiber-based optical modulator |
| US10730785B2 (en) | 2016-09-29 | 2020-08-04 | Nlight, Inc. | Optical fiber bending mechanisms |
| US10768433B2 (en) | 2015-09-24 | 2020-09-08 | Nlight, Inc. | Beam parameter product (bpp) control by varying fiber-to-fiber angle |
| CN112014921A (en) * | 2020-09-14 | 2020-12-01 | 东北大学 | Concave refractive index optical fiber for shaping Gaussian beam into flat-top beam |
| US10916908B2 (en) | 2015-01-26 | 2021-02-09 | Nlight, Inc. | High-power, single-mode fiber sources |
| US10971884B2 (en) | 2015-03-26 | 2021-04-06 | Nlight, Inc. | Fiber source with cascaded gain stages and/or multimode delivery fiber with low splice loss |
| US10971885B2 (en) | 2014-06-02 | 2021-04-06 | Nlight, Inc. | Scalable high power fiber laser |
| CN113866883A (en) * | 2021-10-12 | 2021-12-31 | 桂林电子科技大学 | Novel optical fiber mode field converter and preparation method thereof |
| CN113900174A (en) * | 2021-09-14 | 2022-01-07 | 南京理工大学 | Rare earth doped optical fiber with Lelo triangular fiber core |
| CN114355505A (en) * | 2021-12-31 | 2022-04-15 | 长飞光纤光缆股份有限公司 | Laser shaping optical fiber, and preparation method and application thereof |
-
2004
- 2004-06-02 CN CN 200410024873 patent/CN1584644A/en active Pending
Cited By (34)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102023334B (en) * | 2010-12-15 | 2012-05-23 | 江苏大学 | Large-mode field fiber |
| CN102023334A (en) * | 2010-12-15 | 2011-04-20 | 江苏大学 | Large-mode field fiber |
| CN102116897A (en) * | 2011-03-04 | 2011-07-06 | 北京交通大学 | Cladded pumping optical fiber capable of efficiently adsorbing pumping light |
| CN103018820A (en) * | 2012-12-28 | 2013-04-03 | 江苏大学 | Flat-top optical fiber |
| CN103063640A (en) * | 2012-12-28 | 2013-04-24 | 西北核技术研究所 | Laser-induced fluorescence combustion field parameter measuring device |
| US10971885B2 (en) | 2014-06-02 | 2021-04-06 | Nlight, Inc. | Scalable high power fiber laser |
| CN107003474A (en) * | 2014-10-23 | 2017-08-01 | 科拉克蒂夫高科技公司 | With beam shaping component, fiber component |
| US10916908B2 (en) | 2015-01-26 | 2021-02-09 | Nlight, Inc. | High-power, single-mode fiber sources |
| US10971884B2 (en) | 2015-03-26 | 2021-04-06 | Nlight, Inc. | Fiber source with cascaded gain stages and/or multimode delivery fiber with low splice loss |
| CN107924023A (en) * | 2015-07-08 | 2018-04-17 | 恩耐公司 | With the suppressed fiber of the refractive index of the centre for increased Beam parameter product |
| US10520671B2 (en) | 2015-07-08 | 2019-12-31 | Nlight, Inc. | Fiber with depressed central index for increased beam parameter product |
| CN107924023B (en) * | 2015-07-08 | 2020-12-01 | 恩耐公司 | Fibers having suppressed center refractive index for increased beam parameter product |
| US11719948B2 (en) | 2015-09-24 | 2023-08-08 | Nlight, Inc. | Beam parameter product (BPP) control by varying fiber-to-fiber angle |
| US10768433B2 (en) | 2015-09-24 | 2020-09-08 | Nlight, Inc. | Beam parameter product (bpp) control by varying fiber-to-fiber angle |
| CN109642981B (en) * | 2016-02-05 | 2021-07-27 | 纽弗恩 | Mode-mixing optical fiber and method and system using same |
| CN109642981A (en) * | 2016-02-05 | 2019-04-16 | 纽弗恩 | Mode mixture optical fiber and the method and system for using it |
| US10656330B2 (en) | 2016-09-29 | 2020-05-19 | Nlight, Inc. | Use of variable beam parameters to control solidification of a material |
| US10673198B2 (en) | 2016-09-29 | 2020-06-02 | Nlight, Inc. | Fiber-coupled laser with time varying beam characteristics |
| US10673199B2 (en) | 2016-09-29 | 2020-06-02 | Nlight, Inc. | Fiber-based saturable absorber |
| US10673197B2 (en) | 2016-09-29 | 2020-06-02 | Nlight, Inc. | Fiber-based optical modulator |
| US10730785B2 (en) | 2016-09-29 | 2020-08-04 | Nlight, Inc. | Optical fiber bending mechanisms |
| US10663767B2 (en) | 2016-09-29 | 2020-05-26 | Nlight, Inc. | Adjustable beam characteristics |
| CN107971630A (en) * | 2016-10-21 | 2018-05-01 | 深圳市硕德激光技术有限公司 | A kind of method and laser-processing system for producing the hot spot with special light distribution |
| CN106908894A (en) * | 2017-03-23 | 2017-06-30 | 燕山大学 | A kind of dispersion flattene consolidates microstructured optical fibers entirely |
| CN106908894B (en) * | 2017-03-23 | 2020-01-07 | 燕山大学 | Chromatic dispersion flat full-solid microstructure optical fiber |
| CN107678086A (en) * | 2017-08-31 | 2018-02-09 | 北京航天控制仪器研究所 | A kind of optical fiber for realizing that Gauss beam reshaping is one-dimensional flat top beam |
| CN107678086B (en) * | 2017-08-31 | 2020-02-11 | 北京航天控制仪器研究所 | Optical fiber for realizing Gaussian beam shaping into one-dimensional flat-top beam |
| CN108613137A (en) * | 2018-05-31 | 2018-10-02 | 广州赛西标准检测研究院有限公司 | LED light-guiding pillars and light-conducting system |
| CN109445019A (en) * | 2018-11-02 | 2019-03-08 | 北京大学 | A kind of rectangle core structure optical fiber |
| CN112014921B (en) * | 2020-09-14 | 2021-06-11 | 东北大学 | Concave refractive index optical fiber for shaping Gaussian beam into flat-top beam |
| CN112014921A (en) * | 2020-09-14 | 2020-12-01 | 东北大学 | Concave refractive index optical fiber for shaping Gaussian beam into flat-top beam |
| CN113900174A (en) * | 2021-09-14 | 2022-01-07 | 南京理工大学 | Rare earth doped optical fiber with Lelo triangular fiber core |
| CN113866883A (en) * | 2021-10-12 | 2021-12-31 | 桂林电子科技大学 | Novel optical fiber mode field converter and preparation method thereof |
| CN114355505A (en) * | 2021-12-31 | 2022-04-15 | 长飞光纤光缆股份有限公司 | Laser shaping optical fiber, and preparation method and application thereof |
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