CN101738654B - Novel optical element for generating non-diffracting light - Google Patents
Novel optical element for generating non-diffracting light Download PDFInfo
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- CN101738654B CN101738654B CN2009102668717A CN200910266871A CN101738654B CN 101738654 B CN101738654 B CN 101738654B CN 2009102668717 A CN2009102668717 A CN 2009102668717A CN 200910266871 A CN200910266871 A CN 200910266871A CN 101738654 B CN101738654 B CN 101738654B
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- pyramid
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Abstract
The invention discloses a optical element for generating non-diffracting light, comprising a positive axis pyramid and a negative axis pyramid which have the same radius of the bottom surface, wherein the positive axis pyramid is in a cone structure the bottom surface of which is in a plane shape; the bottom of the negative axis pyramid is in a conical concave shape and the top surface is in a plane corresponding to the bottom surface of the positive axis pyramid; the bottom surface of the positive axis pyramid and the top surface of the negative axis pyramid coincide with and are glued together; and the base angle of the positive axis pyramid is larger then that of the negative axis pyramid. Through the wave optical and matrix optical theory, an equivalent base angle of the novel optical element for generating non-diffracting light is the difference between the base angles of the positive axis pyramid and the negative axis pyramid; by the combination of the positive axis pyramid and the negative axis pyramid with larger base angles, the characteristics of the optical element are same as the characteristics of the positive axis pyramid with small angle, and the base angles of the positive axis pyramid and the negative axis pyramid are not limited in the smaller angle; in addition, the invention overcomes the current situation that the small angle is difficult to process, reduces the requirement on the processing technology, reduces the processing cost and can be widely applied in the process of actually generating the non-diffracting light.
Description
Technical field
The present invention is a kind of optical element that produces diffraction light-free, is applicable to aspects such as precise alignment, scientific research, produces in the diffraction light-free process and can be widely used in reality especially.
Background technology
The J.Durnin of U.S. Rochester university has proposed diffraction light-free first in 1987, it propagates no diffraction in free space, and promptly the lateral light field distribution does not change with propagation distance in the communication process; The light field concentration of energy, center spot is little and intensity is high.The tempting characteristics of diffraction light-free make it have many potential application, as are applied to accurately measure and collimation, Precision Machining cutting, charged particle and neutral atom guiding, microoperation experiment, non-linear optical field etc.
The production method of diffraction light-free mainly contains circumferential weld-lens method, holography method, spherical aberration method, axle pyramid method etc., wherein the conversion efficiency of circumferential weld-lens method is low especially, have only about 15%, the anti-damage threshold of holography method is lower, the axle pyramid is because simple in structure, the conversion efficiency height, anti-damage threshold is high and as the most frequently used optical element that produces diffraction light-free.But in the practical application of diffraction light-free bundle, often need the diffraction light-free of long distance, do not have the diffraction range formula by maximum
Under incident beam radius a one stable condition, maximum no diffraction is apart from Z as can be known
MaxBase angle θ is inversely proportional to the axle pyramid, and promptly the no diffraction distance that forms of the more little axle pyramid in base angle is long more, but that the more little axle pyramid in base angle requires process technology is high more, and cost is also high more, has limited the widespread use of diffraction light-free to a certain extent.
Summary of the invention
The object of the present invention is to provide the optical element of the very low generation diffraction light-free of a kind of handling ease, cost.
Technical scheme of the present invention is such: a kind of optical element that produces diffraction light-free, comprise positive axis pyramid and negative axle pyramid that the bottom surface radius equates, this positive axis pyramid is that the bottom surface is plane conical structure, the bottom surface of this negative axle pyramid is conical inner concavity, end face is and corresponding plane, the bottom surface of above-mentioned positive axis pyramid, the end face of the bottom surface of above-mentioned positive axis pyramid and above-mentioned negative axle pyramid matches glued together, and the base angle of above-mentioned positive axis pyramid is greater than the base angle of above-mentioned negative axle pyramid.
The base angle of above-mentioned positive and negative axle pyramid is all greater than 0 ° and smaller or equal to 10 °.
By the equivalent base angle of the optical element of wave optics and optical matrix theory generation diffraction light-free of the present invention as can be known base angle poor of positive and negative axle pyramid, there is not the diffraction range formula as can be known when the directional light incident by maximum again, maximum no diffraction distance is only relevant with the difference at positive and negative axle pyramid base angle, therefore selects different positive and negative axle pyramid base angles just can obtain the diffraction light-free of different distance.
After adopting such scheme, a kind of optical element that produces diffraction light-free of the present invention, its advantage is: by the positive and negative axle pyramid combination at big base angle, make its characteristic identical with low-angle positive axis pyramid, and the base angle of positive and negative axle pyramid need not be confined to especially little angle, has overcome the present situation of low-angle processing difficulties, has reduced the requirement to process technology, reduced processing cost, in the process of reality generation diffraction light-free, can be widely used.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a light path synoptic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and example structure of the present invention and principle are described in further detail.
A kind of optical element that produces diffraction light-free of the present invention shown in Fig. 1-2, comprises positive axis pyramid 1 that optical glass commonly used is made, that the bottom surface radius equates and negative axle pyramid 2; Positive axis pyramid 1 is plane conical structure for bottom surface 11, and the base angle of positive axis pyramid 1 is θ
1The bottom surface 21 of negative axle pyramid 2 is conical inner concavity, end face 22 is and 11 corresponding planes, the bottom surface of positive axis pyramid 1, and the base angle of negative axle pyramid 2 is θ
2The end face 22 of the bottom surface 11 of positive axis pyramid and negative axle pyramid matches glued together, and the base angle θ of positive axis pyramid
1Base angle θ greater than negative axle pyramid
2
As shown in Figure 1, this optical element of the present invention is along Z axle rotation symmetry, negative axle pyramid 2 is in the left side on XY plane, and positive axis pyramid 1 is on the right side on XY plane, therefore can regard this optical element of the present invention as the positive and negative axle pyramid that waits the bottom surface radius be that cemented surface glues together and forms with the XY plane.
As shown in Figure 2, left side incident be parallel beam, by being converted to the diffraction light-free bundle behind the optical element of the present invention, be diffraction light-free in the ABCD diamond-shaped area.
Equivalent base angle by the optical element of wave optics and optical matrix theory generation diffraction light-free of the present invention as can be known is the base angle θ of positive and negative axle pyramid
1And θ
2Poor, do not have the diffraction range formula by maximum again
As can be known when directional light incident, maximum no diffraction distance is only relevant with the difference at the base angle of positive and negative axle pyramid, so selects different base angle θ
1And θ
2Can obtain the diffraction light-free of different distance.
As an embodiment, we select the base angle θ of positive axis pyramid 1
1=7 °, the base angle θ of negative axle pyramid 2
2=6 °, like this, the equivalent base angle θ=θ of the optical element of generation diffraction light-free of the present invention
1-θ
2=1 °, that is to say base angle θ
1=7 °, θ
2The diffraction light-free of the positive axis pyramid generation of the diffraction light-free that=6 ° optical element produces and base angle θ=1 ° is identical, has so just solved the present situation of present low-angle axle pyramid processing difficulties, has reduced the requirement to process technology, has reduced processing cost.
Claims (2)
1. optical element that produces diffraction light-free, it is characterized in that: comprise positive axis pyramid and negative axle pyramid that the bottom surface radius equates, this positive axis pyramid is that the bottom surface is plane conical structure, the bottom surface of this negative axle pyramid is conical inner concavity, end face is and corresponding plane, the bottom surface of above-mentioned positive axis pyramid, the end face of the bottom surface of above-mentioned positive axis pyramid and above-mentioned negative axle pyramid matches glued together, and the base angle of above-mentioned positive axis pyramid is greater than the base angle of above-mentioned negative axle pyramid.
2. a kind of optical element that produces diffraction light-free according to claim 1 is characterized in that: the base angle of above-mentioned positive and negative axle pyramid is all greater than 0 ° and smaller or equal to 10 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102668717A CN101738654B (en) | 2009-12-31 | 2009-12-31 | Novel optical element for generating non-diffracting light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102668717A CN101738654B (en) | 2009-12-31 | 2009-12-31 | Novel optical element for generating non-diffracting light |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101738654A CN101738654A (en) | 2010-06-16 |
| CN101738654B true CN101738654B (en) | 2011-11-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009102668717A Expired - Fee Related CN101738654B (en) | 2009-12-31 | 2009-12-31 | Novel optical element for generating non-diffracting light |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102116883B (en) * | 2011-03-09 | 2015-04-15 | 华侨大学 | Novel cone lens for generating Bottle beams with periodicity |
| CN102116882A (en) * | 2011-03-09 | 2011-07-06 | 华侨大学 | Novel cone lens generating single bottle beam |
| CN103091736A (en) * | 2013-02-05 | 2013-05-08 | 华侨大学 | Concave axicon capable of producing long distance non-diffraction beams |
| CN110227884A (en) * | 2019-05-08 | 2019-09-13 | 桂林电子科技大学 | Water Jet Guided Laser system of processing and method based on salt free ligands light path design |
| CN112496528A (en) * | 2020-11-03 | 2021-03-16 | 深圳市韵腾激光科技有限公司 | Light path component, laser cutting head and laser cutting equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201589871U (en) * | 2009-12-31 | 2010-09-22 | 华侨大学 | Novel optical component generating non-diffracting beams |
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2009
- 2009-12-31 CN CN2009102668717A patent/CN101738654B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201589871U (en) * | 2009-12-31 | 2010-09-22 | 华侨大学 | Novel optical component generating non-diffracting beams |
Non-Patent Citations (2)
| Title |
|---|
| 蔡邦维等.旋转棱镜对激光束的变换特性.《中国激光》.1994,第A21卷(第1期),21-25. * |
| 黄启禄等.被动方式产生近似无衍射贝塞尔光技术.《中国光学与应用光学》.2009,第2卷(第4期),289-295. * |
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| CN101738654A (en) | 2010-06-16 |
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Granted publication date: 20111116 Termination date: 20121231 |