CN104849779A - Optical element capable of generating long-distance Bessel light beam - Google Patents
Optical element capable of generating long-distance Bessel light beam Download PDFInfo
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- CN104849779A CN104849779A CN201510276533.7A CN201510276533A CN104849779A CN 104849779 A CN104849779 A CN 104849779A CN 201510276533 A CN201510276533 A CN 201510276533A CN 104849779 A CN104849779 A CN 104849779A
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- optical element
- light beam
- refractive index
- bessel light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B3/00—Simple or compound lenses
- G02B3/0087—Simple or compound lenses with index gradient
Abstract
The invention discloses an optical element capable of generating a long-distance Bessel light beam. The optical element is a plane lens. The refractive index of the plane lens shows linear gradient change in the radial direction. The linear gradient change in the refractive index in the radial direction enables the plane lens to have the line focusing effect as an axicon, and an incidence light beam is subjected to line focusing to generate a Bessel light beam. The surface of the optical element is a plane and is wear-resistance, so that the problem of turning the optical element into a round-top axicon due to wearing is solved, and modulation of the refractive index and the thickness reduces processing requirements to the greatest extent. The non-diffracting distance of the Bessel light beam of linear change can be generated by changing parameters of the material thickness and the refractive index, and Bessel light beams of different non-diffracting distances can be formed by modulation. Therefore, the optical element provided by the invention is an optical element, which is simple, has high operability and is flexible and high in light beam quality, for generating Bessel light.
Description
Technical field
The present invention relates to a kind of optical element that can produce long distance Bessel light beam, belong to optical delivery conversion field and optical design arts.
Background technology
Bessel light beam is a kind of special light beam, and in transmission field, have unique character, as center spot is minimum, central light strength is very big, does not disperse within the specific limits, and running into barrier can from rebuilding.These characteristics of Bessel light beam make it in particle confinement, optics pulling force, optical imagery, optical guidance, high-precision fixed to or the field such as collimation obtain application, the research of Bessel light beam is become already to the focus in optical beam transformation field.
Axle pyramid is a kind of conical rotational symmetry optical element, because the operability that axle pyramid method produces Bessel light beam is stronger, energy conversion efficiency is higher, beam quality is better, the axle pyramid that uses produces Bessel light beam more at present, but, the requirement of this method to axle pyramid base angle higher (the axle pyramid of lower 1 ° of general condition only can produce the approximate Bessel light of 24.4cm under 4mm aperture with He-Ne laser), due to processing restriction, axle pyramid base angle is difficult to do minimum (0.5 ° very little), which limits the increase of the non diffracting distance of Bessel light beam, in actual applications (as laser ranging) be extremely restricted.Moreover the center cone angle of axle pyramid is very easily damaged, becomes dome axle pyramid after damage, then can reduce beam quality, affect experiment effect.Therefore, design can produce and grow distance Bessel light and anti abrasive lens and become and especially have practical significance.
Summary of the invention
The object of the present invention is to provide a kind of anti abrasive optical element that can produce long distance Bessel light.
To achieve these goals, the present invention adopts following technical scheme:
Can produce an optical element for long distance Bessel light beam, this optical element is planar lens, and the refractive index of this planar lens radially linearly graded.
Described planar lens is soft film-form.
Described planar lens is radial gradient index material plane lens.
After adopting such scheme, a kind of optical element that can produce long distance Bessel light beam of the present invention, because the refractive index linear gradient of element changes, from diverse location vertical incidence, the light path of emergent light experience is different, constant phase front after plane wave vertical incidence is a conical surface, and this makes the geometric model of planar lens of the present invention similar with traditional axle pyramid and has identical line focus effect, and incident beam just can be produced Bessel light beam by after line focus.Element surface is that plane is more wear-resistant, does not deposit the problem becoming dome axle pyramid upon wear, and processing request drops to minimum by the modulating action of refractive index and thickness; Change material thickness and refractive index variable parameter and all linear change can produce the non diffracting distance of Bessel light beam, modulate the Bessel light beam of different the non diffracting distance.Therefore, optical element of the present invention is that a kind of generation Bessel light is simpler, has more operability, more flexibly, and the optical element that beam quality is higher.
Planar lens in the present invention is the planar lens that radial gradient index material is made.
Further, the planar lens in the present invention can be soft film-form, the film that refractive index linear gradient changes is attached to the exit facet of optical system, and emergent light is long distance Bessel light, directly produces Bessel light and does not need extra modulation.
In addition, optical element of the present invention, can organize superposition (guarantee center superposition) more and use, and many group superpositions can produce the Bessel light beam of different distance.During use, many groups that available refractive index variable gradient is identical optical elements of the present invention (thickness is identical or not identical) superpose, and the many groups of optical elements of the present invention (thickness is identical or not identical) that also available refractive index variable gradient is different superpose.
Accompanying drawing explanation
Fig. 1 is the structural representation of optical element of the present invention;
Fig. 2 be optical element of the present invention etc. refractive index face schematic diagram;
Fig. 3 is the geometric analysis figure that optical element of the present invention produces Bessel light;
Fig. 4 is the surface of intensity distribution of the long distance Bessel light that optical element of the present invention produces;
Fig. 5 is the schematic diagram that the optical element combination of the present invention of different parameters modulates the Bessel light of different distance.
Embodiment
Below in conjunction with accompanying drawing, the structure of optical element of the present invention and principle are described in further detail.
A kind of optical element that can produce long distance Bessel light beam of the present invention, this optical element be entirety is column structure, and the plane of incidence and exit facet are plane and the planar lens be parallel to each other, and the refractive index of this planar lens radially linearly graded.Particularly, this planar lens can adopt radial gradient index material to make, document [Zhang Fengying, light copolymerization method is utilized to manufacture plastics gradient index rod. optical technology, 1988 (03): the 7-11 pages] in mention and " utilize light copolymerization method; except formula (1) index distribution, the gradient index rod with various distribution curve can also be manufactured." according to this document, radial gradient index material can be prepared by light copolymerization method.
In the present invention, the refractive index of planar lens radially linearly graded refer in planar lens identical apart from the local refractive index that center position is identical, " radial direction " refers to index distribution characteristic, has nothing to do with profile, and planar lens can be circular or non-circular.
As a preferred embodiment, as shown in Figure 1, a kind of optical element that can produce long distance Bessel light beam of the present invention, this optical element is overall in cylindrical-shaped structure, the plane of incidence 11 and exit facet 12 are plane and the circular flat lens 100 be parallel to each other, and the radially linear gradient reduction of the refractive index of these circular flat lens 100.
As shown in Figure 2, circular flat lens 100 etc. refractive index face 13 be one along the cylinder of optical axis direction, the variations in refractive index parameter of circular flat lens 100 is:
wherein, n
0for element central place refractive index, r is the distance apart from center, and g is refractive index gradient variation factor.
Due to the refractive index radially linear gradient change of circular flat lens 100, from diverse location vertical incidence, the light path of emergent light experience is different, constant phase front after plane wave vertical incidence is a conical surface, and this makes the geometric model of circular flat lens 100 similar with traditional axle pyramid and has identical line focus effect.
Fig. 3 illustrates the geometric analysis of the incident circular flat lens 100 of directional light, and prismatic region is the salt free ligands scope of Bessel light beam.In the present embodiment, circular flat lens 100 thickness is even, but refractive index with apart from distance of shaft centers from increase linearly reduce, cause the phase change of outgoing beam different, constant phase front, to intrinsic deflection, produces Bessel light beam.The light distribution of this Bessel light beam as shown in Figure 4.
By geometrical optics, we obtain the salt free ligands scope formula that element produces Bessel light beam
wherein, R is the incident radius of light beam, and D is component thickness, and g is refractive index gradient variation factor.Formula is known thus, and component thickness has identical modulation effect with refractive index parameter to Bessel light, and reduction thickness D or refractive index parameter all can increase the non diffracting distance.
The amplitude transmittance of optical element of the present invention is t (r)=exp (-ikgDr), and wherein, i is imaginary number, k is incident beam wave vector, g is planar lens refractive index gradient variation factor, and D is planar lens thickness, and r is the distance of lens center, anomaly face.The salt free ligands scope that modulation directional light produces Bessel light beam is
when many groups optical element of the present invention superposes (guarantee center superposition) mutually, because element is planar lens, each other can compact siro spinning technology, its amplitude transmittance equals the product of each element amplitude transmittance, the parameter (gD) being equivalent to discrete component during superposition increases, and the salt free ligands scope of the Bessel light beam of generation is corresponding to diminish.
During use, many groups that available refractive index variable gradient is identical optical elements of the present invention (thickness is identical or not identical) superpose, and the many groups of optical elements of the present invention (thickness is identical or not identical) that also available refractive index variable gradient is different superpose.As shown in Figure 5, the present embodiment is that two identical, that variations in refractive index gradient is different optical elements of the present invention of thickness are superposed use mutually, creates the Bessel light of different the non diffracting distance.
Optical element of the present invention can be soft film-form, the film that refractive index linear gradient changes is attached to the exit facet of optical system, and emergent light is long distance Bessel light, directly produces Bessel light and does not need extra modulation.
Claims (3)
1. can produce an optical element for long distance Bessel light beam, it is characterized in that: this optical element is planar lens, and the refractive index of this planar lens radially linearly graded.
2. a kind of optical element that can produce long distance Bessel light beam according to claim 1, is characterized in that: described planar lens is soft film-form.
3. a kind of optical element that can produce long distance Bessel light beam according to claim 1 and 2, is characterized in that: described planar lens is radial gradient index material plane lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510276533.7A CN104849779B (en) | 2015-05-27 | 2015-05-27 | It is a kind of to produce the optical element of long range Bessel light beams |
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| CN201510276533.7A CN104849779B (en) | 2015-05-27 | 2015-05-27 | It is a kind of to produce the optical element of long range Bessel light beams |
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| CN104849779A true CN104849779A (en) | 2015-08-19 |
| CN104849779B CN104849779B (en) | 2017-07-28 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018189080A1 (en) * | 2017-04-13 | 2018-10-18 | Schott Ag | Device and method for laser-based separation of a transparent, brittle workpiece |
| 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 |
| CN111243443A (en) * | 2020-03-16 | 2020-06-05 | 京东方科技集团股份有限公司 | Optical substrate, preparation method and display panel |
| CN111525273A (en) * | 2020-05-11 | 2020-08-11 | 北京大学 | Terahertz super-surface Bessel lens |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018189080A1 (en) * | 2017-04-13 | 2018-10-18 | Schott Ag | Device and method for laser-based separation of a transparent, brittle workpiece |
| CN110753596A (en) * | 2017-04-13 | 2020-02-04 | 肖特股份有限公司 | Device and method for laser-based separation of transparent and fragile workpieces |
| CN110753596B (en) * | 2017-04-13 | 2021-10-08 | 肖特股份有限公司 | Device and method for laser-based separation of transparent and fragile workpieces |
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| 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 |
| CN111243443A (en) * | 2020-03-16 | 2020-06-05 | 京东方科技集团股份有限公司 | Optical substrate, preparation method and display panel |
| CN111243443B (en) * | 2020-03-16 | 2022-06-03 | 京东方科技集团股份有限公司 | Optical substrate, preparation method and display panel |
| CN111525273A (en) * | 2020-05-11 | 2020-08-11 | 北京大学 | Terahertz super-surface Bessel lens |
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