CN105607162A - Novel optical lens acquiring long focal depth Bessel gauss light beams through focusing - Google Patents
Novel optical lens acquiring long focal depth Bessel gauss light beams through focusing Download PDFInfo
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- CN105607162A CN105607162A CN201610107420.9A CN201610107420A CN105607162A CN 105607162 A CN105607162 A CN 105607162A CN 201610107420 A CN201610107420 A CN 201610107420A CN 105607162 A CN105607162 A CN 105607162A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 26
- 238000005516 engineering process Methods 0.000 claims abstract description 13
- 239000012780 transparent material Substances 0.000 claims abstract description 3
- 238000009826 distribution Methods 0.000 abstract description 7
- 238000005520 cutting process Methods 0.000 abstract description 5
- 230000001668 ameliorated effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 9
- 238000003698 laser cutting Methods 0.000 description 6
- 238000004080 punching Methods 0.000 description 5
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- 238000003754 machining Methods 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/10—Bifocal lenses; Multifocal lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B2003/0093—Simple or compound lenses characterised by the shape
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Abstract
The invention discloses a novel optical lens acquiring long focal depth Bessel gauss light beams through focusing. The novel optical lens comprises a multi-zone curved surface and a focusing curved surface, wherein the multi-ring curved surface and the focusing curved surface are coaxially superposed, the multi-ring curved surface is provided with rings in a concentric-circle structure, surfaces of the rings are spherical surfaces or aspheric surfaces, ring-shaped optical axes are arranged among the adjacent rings, and the focusing curved surface is a spherical surface or an aspheric surface. The single lens is employed for focusing, so the Bessel gauss light beams are acquired, the energy distribution density at the center scope is quite high, quite-low focusing light beam segments are distributed at the edge, the power density scope is high, light spots are quite small, the focal depth is quite long, and light spot peak value power densities in the focal depth segment are similar. According to the novel optical lens, assembly precision requirements of the lens are common, the lens has relatively wide universality for laser beam modes, the fine laser processing technology can be improved and ameliorated, especially for the cutting technology of transparent materials.
Description
Technical field
The present invention relates to optical device field, be specially the long depth of focus Bezier of a kind of focusing acquisition highThese light beam novel optical lens.
Background technology
Laser processing technology be utilize swash the characteristic of light-matter interaction carry out laser cutting,Welding, surface treatment, punching, micro-processing etc., wherein especially with laser cutting, punching, micro-addingThe techniques such as work are relatively high to laser focusing bundle characteristic requirements. Under equal laser power, often mustPossess that focal beam spot is little, depth of focus is long, peak power density is high simultaneously, could promote to a greater extentProcess velocity and quality.
Nowadays, laser cutting occupies the more than half market of laser processing technology becomes main flow, major partLaser cutting light path adopts even aspherical mirror of the good lens combination of optical property. But, normalThe focal beam spot hour that rule eyeglass, mirror group and aspherical mirror obtain, depth of focus length limited;Met depth of focus length, hot spot is compared with large and peak power reduction.
Axially multifocal lens can make up conventional eyeglass, mirror group and aspherical mirror to a certain extentDeficiency, can realize that focal beam spot is little, depth of focus is longer simultaneously. Shortcoming is, axial multifocal some mirrorIt is multifactor that sheet is limited to laser beam pattern composition, incident beam size etc., steady thereby impact is usedQualitative and scope.
Axicon lens can obtain bessel beam, and then realizes long depth of focus small light spot high power peakValue Energy distribution. Not enough, hot spot peak power density difference in axicon lens focal depth rangeObvious, and high to mechanical assembly precision requirement, be difficult to be widely used in industrial lasers processingIndustry.
For improving the processing technologys such as existing laser cutting, punching, micro-processing, improve eyeglass to swashingBeam mode universality and focal beam spot depth of focus section inner laser bundle peak power stability, simultaneouslyReduce assembly precision requirement, reduce light path lens quantity and complexity, to be applicable to general occasion,The present invention proposes a kind of new type lens, coaxial many endless belt Gauss mirror, and parallel incident light is focused on canObtain Bessel-Gaussian beam, focusing section high energy distribution scope hot spot is little, depth of focus is extremely long and burntIn dark scope, hot spot peak power density is basically identical.
Summary of the invention
The object of the present invention is to provide one to focus on and can obtain focal beam spot parallel incident lightHigh power density scope is minimum, and peak power density is high, and depth of focus is length and the interior peak of focal depth range extremelyThe very little Bessel-Gaussian beam of value power density difference, can be used for improving focused beam characteristicRequire high laser processing technology as laser cutting, punching, micro-processing etc., be particularly advantageous in and carryLaser Processing speed and the quality of high transparent material, to solve asking of proposing in above-mentioned background technologyThe technical scheme of topic. To overcome general spherical mirror, spherical mirror group and even aspherical mirror focal beam spotSmall size and long depth of focus incompatibility problem, improve eyeglass to laser beam pattern universality, improves burntDark section inner laser bundle peak power stability, and reduce the requirement of eyeglass self assembly precision, reduceEyeglass quantity and the complexity of laser working light path, improve laser cutting, punching, micro-processing etc.The laser processing technology higher to laser focusing beam request, improving laser process velocity and quality.
A kind of focusing obtains long depth of focus Bessel-Gaussian beam novel optical lens, comprises many endless beltCurved surface and focusing curved surface, described many endless belt curved surface and focusing curved surface mutually superpose and establish with coaxial mannerPut; On described many endless belt curved surface, be provided with concentric structure endless belt is set, endless belt surface is ballFace or aspheric surface, be provided with annular optical axis between adjacent endless belt: described focusing curved surface be sphere orAspheric surface.
As preferably, annular optical axis is concentric and be parallel to each other with center of lens axle.
As preferably, the positive and negative assembling mode of eyeglass all can adopt, and needs parallel incident light or closely parallelIncident light incident, focal beam spot position is focal position before and after eyeglass, eyeglass focal length depends on separatelyOne focuses on the corresponding focal length of curved surface.
As preferably, the impact of focal beam spot overall size Stimulated Light light beam parameters, depends primarily on and establishesThe focal beam spot of meter eyeglass.
As preferably, focal beam spot overall size just becomes with the endless belt width of coaxial many endless belt Gauss mirrorRatio, is inversely proportional to corresponding endless belt focal length, is directly proportional with the corresponding focal length of another focusing surface of eyeglass, thanExample coefficient is about 1.
As preferably, depth of focus length is with high power density distributed areas, focused beam center sizeChange and weigh.
As preferably, eyeglass is applicable to improve meticulous laser processing technology, particularly transparent materialLaser processing technology.
Compared with prior art, the invention has the beneficial effects as follows: this invention adopts single eyeglassFocus on and obtain Bessel-Gaussian beam, form center range Energy distribution high, the edge distribution utmost pointLow focused beam section, its high power density scope hot spot is minimum, and depth of focus is extremely long, light in depth of focus sectionSpot peak power density is close. This kind of eyeglass assembly precision requires generally, to laser beam pattern toolThere is wider universality, can improve and improve laser retrofit technique, particularly transparent materialCutting technique.
Brief description of the drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is endless belt curved-surface structure schematic diagram;
Fig. 3 is cutting plane structural representation of the present invention;
Fig. 4 is partial cutaway tangent plane structural representation of the present invention;
Fig. 5 is each annular sphere band optical axis shown in coaxial many endless belt Gauss mirror and dotted line;
Fig. 6 is embodiment 1 assembling mode, and light splitting in the process of beam Propagation shown in dotted lineDemonstration;
Fig. 7 is embodiment 2 assembling modes, and light splitting in the process of beam Propagation shown in dotted lineDemonstration;
Fig. 8 is that eyeglass focuses on cross section hot spot power Smoothing fit Bezier Gaussian distribution cut away view;
Fig. 9 is that eyeglass focuses on depth of focus section out of focus cross section hot spot power Smoothing fit Bezier GaussDistribution cut away view.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, to the technical side in the embodiment of the present inventionCase is clearly and completely described, and obviously, described embodiment is only one of the present inventionDivide embodiment, instead of whole embodiment. Based on the embodiment in the present invention, this area is generalLogical technical staff is not making the every other embodiment obtaining under creative work prerequisite,All belong to the scope of protection of the invention.
Refer to Fig. 1～4, the invention provides a kind of focusing and obtain long depth of focus Bessel-Gaussian beamNovel optical lens, comprise many endless belt curved surface 2 and focus on curved surface 1, many endless belt curved surface 2 and poly-Focal surface 1, with the coaxial manner setting that mutually superposes, is provided with concentric circles on many endless belt curved surface 2Structure arranges endless belt 3, and endless belt 3 surfaces are sphere or aspheric surface, between adjacent endless belt 3, arrangesHave annular optical axis 4, focusing on curved surface 1 is sphere or aspheric surface. At parallel or near parallel incident lightUnder, can obtain focal beam spot high power density scope minimum, peak power density is high, depth of focusThe extremely very little Bessel-Gaussian beam of peak power density difference in length and focal depth range. ConsiderThis kind of unnecessary anaberration of eyeglass and machining eyeglass cost, select sphere scheme the best. Originally establishMeter is selected sphere scheme, but contains aspheric surface and both combinations.
Wherein, annular optical axis 4 is concentric and be parallel to each other with center of lens axle. The positive and negative assembling of eyeglassMode all can adopt, and needs parallel incident light or nearly parallel incident light incident, and focal beam spot position isFocal position before and after eyeglass, eyeglass focal length depends on that another focuses on the corresponding focal length of curved surface.
And the impact of focal beam spot overall size Stimulated Light light beam parameters, depends primarily on design mirrorThe focal beam spot of sheet. Burnt hot spot overall size just becomes with endless belt 3 width of coaxial many endless belt Gauss mirrorRatio, is inversely proportional to corresponding endless belt 3 focal lengths, is directly proportional with the corresponding focal length of another focusing surface of eyeglass,Proportionality coefficient is about 1. Depth of focus length is with high power density distributed areas, focused beam center chiVery little variation is weighed.
Meanwhile, eyeglass is applicable to improve meticulous laser processing technology, particularly transparent materialLaser Processing as techniques such as glass-cuttings. Compared with prior art, this invention adopts single eyeglassCan focus on acquisition Bessel-Gaussian beam, form center range Energy distribution high, edge dividesThe extremely low focused beam section of cloth, its high power density scope hot spot is minimum, and depth of focus is extremely long, depth of focus sectionInterior hot spot peak power density is close. This kind of eyeglass assembly precision requires generally, to laser beam mouldFormula has wider universality, can improve and improve laser retrofit technique, particularly transparentThe cutting technique of material.
Encircle curved surface band by eyeglass more and parallel or near parallel incident beam is carried out to endless belt cut apart, thenBecome endless belt light beam by another curve focusing; Or parallel or near parallel incident light passes through eyeglassCurve focusing shrinks, then the minute surface that has many ring curved surface bands by another is transformed into endless belt focused beam.Endless belt light beam is staggered to be superimposed upon on focal plane, forms the hot spot of certain size size, due to eachEndless belt light beam all has an energy ring to focus in optical axis focus, thereby greatly improves focal beam spotCentral energy distributes, and reduces edge energy and distributes, and in conjunction with the staggered effect of light beam, and then obtainsBessel-Gaussian beam.
Wherein, coaxial many endless belt Gauss mirror annular surface band is spherical annulus or aspheric surface endless belt,Another curved surface also can be by sphere or aspheric surface. In view of eyeglass is without anaberration deliberately, and for fallingLow cost, it is sphere the best that eyeglass one side is selected spherical annulus, another side.
Embodiment 1
The endless belt of coaxial many endless belt Gauss mirror presents equidistantly, and endless belt 3 width are T, are beneficial to and carryThe stability of high eyeglass under different zlasing modes, each endless belt 3 is spherical annulus, sphereRadius equates to be R0, and another spherical radius is R1. Optic diameter depends on launching spot chiVery little.
As shown in Figure 6, taking circle, parallel or nearly directional light incident is as example, and D is that focal beam spot is totalDiameter, under the corresponding corresponding assembling mode of BFL1, BFL2 difference, spherical radius R1 and eyeglass are thickThe back focal length that degree and refractive index form. Wherein, focal beam spot diameter D and spherical radiusR1 and endless belt width T are directly proportional, be inversely proportional to endless belt 3 spherical radius, and theoretical proportionality coefficientBe about 1. As shown in Figure 8, eyeglass focal beam spot overall diameter is D, and actual available high power is closeThe spot diameter that degree distributes is about d, and d is much smaller than focal beam spot overall diameter D.
Embodiment 2
Because eyeglass can positive and negatively assemble, as shown in Figure 7, the parallel or nearly directional light incident with circleFor example, D is focal beam spot overall diameter, under the corresponding corresponding assembling mode of BFL1, BFL2 difference,The back focal length that spherical radius R1 and lens thickness and refractive index form. Wherein, focused lightSpot diameter D is directly proportional to spherical radius R1 and endless belt width T, becomes with endless belt 3 spherical radiusInverse ratio, theoretical proportionality coefficient is about 1. Eyeglass depth of focus section arbitrary section hot spot as seen from Figure 9Overall diameter is D1, and D1 increases actual available high power density along with the increase of out of focus distanceDistribution spot diameter d is substantially constant. In depth of focus section, focal beam spot peak power density differenceNot quite.
Although illustrated and described embodiments of the invention, for the ordinary skill of this areaPersonnel, being appreciated that without departing from the principles and spirit of the present invention can be to thisA little embodiment carry out multiple variation, amendment, replacement and modification, and scope of the present invention is by appended powerProfit requires and equivalent limits.
Claims (7)
1. focus on and obtain long depth of focus Bessel-Gaussian beam novel optical lens, its featureBe: comprise many endless belt curved surface and focus on curved surface, described many endless belt curved surface and focusing curved surface are with sameThe setting that mutually superposes of axle mode; On described many endless belt curved surface, be provided with concentric structure ring is setBand, endless belt surface is sphere or aspheric surface, is provided with annular optical axis between adjacent endless belt: described inFocusing on curved surface is sphere or aspheric surface.
2. the long depth of focus Bessel-Gaussian beam of a kind of focusing acquisition according to claim 1 is newType optical lens, is characterized in that: described annular optical axis is concentric and mutually flat with center of lens axleOK.
3. the long depth of focus Bessel-Gaussian beam of a kind of focusing acquisition according to claim 1 is newType optical lens, is characterized in that: the positive and negative assembling mode of described eyeglass all can adopt, and needs parallelIncident light or nearly parallel incident light incident, focal beam spot position is focal position before and after eyeglass, mirrorSheet focal length depends on that another focuses on the corresponding focal length of curved surface.
4. the long depth of focus Bessel-Gaussian beam of a kind of focusing acquisition according to claim 3 is newType optical lens, is characterized in that: described focal beam spot overall size Stimulated Light light beam parameters impact,Depend on the focal beam spot that designs eyeglass.
5. the long depth of focus Bessel-Gaussian beam of a kind of focusing acquisition according to claim 3 is newType optical lens, is characterized in that: described focal beam spot overall size and coaxial many endless belt Gauss mirrorEndless belt width be directly proportional, be inversely proportional to corresponding endless belt focal length, corresponding with another focusing surface of eyeglassFocal length is directly proportional, and proportionality coefficient is about 1.
6. the long depth of focus Bessel-Gaussian beam of a kind of focusing acquisition according to claim 3 is newType optical lens, is characterized in that: described depth of focus length is close with focused beam center high powerDegree distributed areas change in size is weighed.
7. the long depth of focus Bessel-Gaussian beam of a kind of focusing acquisition according to claim 1 is newType optical lens, is characterized in that: described eyeglass is applicable to improve meticulous laser processing technology,The particularly laser processing technology of transparent material.
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| CN201610107420.9A CN105607162B (en) | 2016-02-26 | 2016-02-26 | One kind is focused on and obtains Diode laser Bessel-Gaussian beam novel optical lens |
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| CN201610107420.9A CN105607162B (en) | 2016-02-26 | 2016-02-26 | One kind is focused on and obtains Diode laser Bessel-Gaussian beam novel optical lens |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891916A (en) * | 2016-06-26 | 2016-08-24 | 上海嘉强自动化技术有限公司 | Aspherical mirror based on axicon and focusing mirror features |
| DE102016115844A1 (en) * | 2016-07-01 | 2018-01-04 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Arrangement for generating a Bessel beam |
| CN109683331A (en) * | 2019-02-01 | 2019-04-26 | 长春理工大学 | A kind of more bottle beams optical optical tweezers systems based on bifocal lens |
| CN110018565A (en) * | 2019-03-19 | 2019-07-16 | 北京工业大学 | A kind of method and apparatus improving ultrafast laser light beam focusing capability |
| CN114839768A (en) * | 2022-04-07 | 2022-08-02 | 浙江大学 | Far field focusing capability improving method based on annular array Airy Gaussian beam |
Citations (3)
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| US20110036818A1 (en) * | 2009-08-13 | 2011-02-17 | National Taiwan University | Optical etching device for laser machining |
| CN104297925A (en) * | 2014-10-11 | 2015-01-21 | 北京工业大学 | Design method of hybrid refractive-diffractive element for achieving femtosecond laser long focal depth |
| CN205720742U (en) * | 2016-02-26 | 2016-11-23 | 上海嘉强自动化技术有限公司 | A kind of focusing obtains Diode laser Bessel-Gaussian beam novel optical lens |
-
2016
- 2016-02-26 CN CN201610107420.9A patent/CN105607162B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20110036818A1 (en) * | 2009-08-13 | 2011-02-17 | National Taiwan University | Optical etching device for laser machining |
| CN104297925A (en) * | 2014-10-11 | 2015-01-21 | 北京工业大学 | Design method of hybrid refractive-diffractive element for achieving femtosecond laser long focal depth |
| CN205720742U (en) * | 2016-02-26 | 2016-11-23 | 上海嘉强自动化技术有限公司 | A kind of focusing obtains Diode laser Bessel-Gaussian beam novel optical lens |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105891916A (en) * | 2016-06-26 | 2016-08-24 | 上海嘉强自动化技术有限公司 | Aspherical mirror based on axicon and focusing mirror features |
| CN105891916B (en) * | 2016-06-26 | 2018-08-14 | 上海嘉强自动化技术有限公司 | A kind of aspherical mirror based on axicon lens Yu focus lamp characteristic |
| DE102016115844A1 (en) * | 2016-07-01 | 2018-01-04 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Arrangement for generating a Bessel beam |
| CN109683331A (en) * | 2019-02-01 | 2019-04-26 | 长春理工大学 | A kind of more bottle beams optical optical tweezers systems based on bifocal lens |
| CN110018565A (en) * | 2019-03-19 | 2019-07-16 | 北京工业大学 | A kind of method and apparatus improving ultrafast laser light beam focusing capability |
| CN114839768A (en) * | 2022-04-07 | 2022-08-02 | 浙江大学 | Far field focusing capability improving method based on annular array Airy Gaussian beam |
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Address after: No. 8 Dongbao Road, Songjiang District, Shanghai, 2016 Patentee after: Jiaqiang (Shanghai) Intelligent Technology Co.,Ltd. Country or region after: China Address before: 201611 first floor, No. 56, Lane 1500, Xinfei Road, Songjiang District, Shanghai Patentee before: SHANGHAI EMPOWER AUTOMATION TECHNOLOGY Co.,Ltd. Country or region before: China |