CN104849779B - It is a kind of to produce the optical element of long range Bessel light beams - Google Patents
It is a kind of to produce the optical element of long range Bessel light beams Download PDFInfo
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- CN104849779B CN104849779B CN201510276533.7A CN201510276533A CN104849779B CN 104849779 B CN104849779 B CN 104849779B CN 201510276533 A CN201510276533 A CN 201510276533A CN 104849779 B CN104849779 B CN 104849779B
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- optical element
- refractive index
- bessel light
- light beams
- planar lens
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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
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- Diffracting Gratings Or Hologram Optical Elements (AREA)
Abstract
The optical element of long range Bessel light can be produced the invention discloses a kind of, this optical element is planar lens, and the radially linear graded of refractive index of this planar lens.The radially linear graded of refractive index causes planar lens to possess the line focus effect of similar axicon, and incident beam just can be produced Bessel light beams after line focus.Element surface be plane more resistant to abrasion, the problem of in the absence of dome axicon is become after abrasion, processing request is preferably minimized by the modulating action of refractive index and thickness；The non diffracting distance of Bessel light beams can be produced with linear change by changing material thickness and refractive index variable parameter, modulate the Bessel light beams of different the non diffracting distances.Therefore, optical element of the invention is that a kind of Bessel light that produces is simpler, more flexible with more operability, the higher optical element of beam quality.
Description
Technical field
The optical element of long range Bessel light beams can be produced the present invention relates to a kind of, belongs to optical delivery conversion field
With optical design arts.
Background technology
Bessel light beams are a kind of special light beams, and the property of uniqueness is possessed in transmission field, and such as center spot is minimum,
Central light strength greatly, does not dissipate within the specific limits, and running into barrier can be from reconstruction etc..These characteristics of Bessel light beams cause
It is in particle confinement, optics pulling force, optical imagery, optical guidance, it is high-precision fixed to or the field such as collimation applied, it is right
The research of Bessel light beams turns into the focus in optical beam transformation field already.
Axicon is a kind of conical axial symmetry optical element, because axicon method produces the operability of Bessel light beams
Stronger, energy conversion efficiency is higher, beam quality is more preferable, many at present to produce Bessel light beams, still, this side using axicon
Requirement of the method to axicon base angle is higher, and (axicon that lower 1 ° of general condition is only capable of producing under 4mm apertures with He-Ne laser
24.4cm approximate Bessel light), due to processing limitation, axicon base angle is difficult to be made minimum (0.5 ° very small),
Which limits the increase of the non diffracting distance of Bessel light beams, in actual applications (such as laser ranging) be extremely restricted.
Furthermore, the center cone angle of axicon is highly prone to damage, and becomes dome axicon after damage, then can reduce beam quality, influences
Experiment effect.Therefore, design can produce long range Bessel light and anti abrasive lens become especially have practical significance.
The content of the invention
Anti abrasive the optical element of long range Bessel light can be produced it is an object of the invention to provide a kind of.
To achieve these goals, the present invention is adopted the following technical scheme that：
A kind of to produce the optical element of long range Bessel light beams, this optical element is planar lens, and this plane is saturating
The radially linear graded of the refractive index of mirror.
The planar lens is soft film-form.
The planar lens is radial gradient index material plane lens.
After such scheme, it is of the invention it is a kind of can produce the optical element of long range Bessel light beams, due to element
The change of refractive index linear gradient, from diverse location vertical incidence, the light path of emergent light experience is different, after plane wave vertical incidence
Equiphase surface be a conical surface, this make it that the geometrical model of the planar lens of the present invention is similar and have phase with tradition axicon
Same line focus effect, incident beam just can be produced Bessel light beams after line focus.Element surface is plane more resistant to abrasion, no
Deposit the problem of becoming dome axicon upon wear, processing request is preferably minimized by the modulating action of refractive index and thickness；Change
Material thickness and refractive index variable parameter can produce the non diffracting distance of Bessel light beams with linear change, modulate different nothings
The Bessel light beams of diffraction distance.Therefore, optical element of the invention is that a kind of Bessel light that produces is simpler, with more operation
Property, more flexible, the higher optical element of beam quality.
Planar lens in the present invention is the planar lens that radial gradient index material is made.
Further, the present invention in planar lens can be soft film-form, by refractive index linear gradient change it is thin
Film is attached to the exit facet of optical system, and emergent light is long range Bessel light, directly produces Bessel light without extra tune
System.
In addition, the optical element of the present invention, multigroup can be superimposed (guarantee center superposition) and uses, multigroup superposition can be produced not
The Bessel light beams of same distance.In use, multigroup optical element (the thickness phase of the invention of available refractive index variable gradient identical
With or differ) be overlapped, it is also possible to the different multigroup optical element of the invention of variations in refractive index gradient (thickness it is identical or
Differ) it is overlapped.
Brief description of the drawings
Fig. 1 is the structural representation of the optical element of the present invention；
Fig. 2 for the present invention optical element etc. refractive index face schematic diagram；
Fig. 3 produces the geometrical analysis figure of Bessel light for the optical element of the present invention；
The surface of intensity distribution for the long range Bessel light that Fig. 4 produces for the optical element of the present invention；
Fig. 5 modulates the schematic diagram of the Bessel light of different distance for the optical element combination of the invention of different parameters.
Embodiment
The structure and principle to optical element of the invention are described in further detail below in conjunction with the accompanying drawings.
The a kind of of the present invention can produce the optical element of long range Bessel light beams, and this optical element is in the form of a column knot to be overall
The refractive index of structure, the planar lens that the plane of incidence is plane and be parallel to each other with exit facet, and this planar lens is in radially line
Property graded.Specifically, this planar lens can be made of radial gradient index material, and document [Zhang Fengying, it is common using light
Poly- legal system makes plastics gradient index rod optical technologies, 1988 (03):The 7-11 pages] in mention " utilize light copolymerization method, except public affairs
Outside formula (1) index distribution, moreover it is possible to gradient index rod of the manufacture with various distribution curves." according to this document, it is radially terraced
Degree refraction materials can be by light copolymerization method and prepare.
In the present invention, the radially linear graded of refractive index of planar lens refers to planar lens middle-range center
Identical apart from the local refractive index of identical, " radial direction " refers to index distribution characteristic, unrelated with profile, and planar lens can be
It is circular or non-circular.
As a preferred embodiment, as shown in figure 1, a kind of of the present invention can produce the light of long range Bessel light beams
Element is learned, this optical element is overall cylindrical structure, the circle that the plane of incidence 11 is plane and be parallel to each other with exit facet 12
Shape planar lens 100, and radially linear gradient reduces the refractive index of this circular flat lens 100.
As shown in Fig. 2 circular flat lens 100 etc. refractive index face 13 be one along optical axis direction cylinder, circular flat
The variations in refractive index parameter of lens 100 is：n(r)=n0- gr wherein, n0For refractive index at element central, r be away from center away from
From g is refractive index gradient variation coefficient.
Due to the refractive index radially linear gradient change of circular flat lens 100, from diverse location vertical incidence, outgoing
The light path of light experience is different, and the equiphase surface after plane wave vertical incidence is a conical surface, and this causes the several of circular flat lens 100
What model is similar with traditional axicon and has identical line focus effect.
Fig. 3 illustrates the geometrical analysis of the incident circular flat lens 100 of directional light, and prismatic region is the nothing of Bessel light beams
Range of diffraction.In the present embodiment, the thickness of circular flat lens 100 is uniform, but refractive index linearly subtracts with the increase away from axle center distance
It is small, cause the phase change difference of outgoing beam, equiphase surface is deflected inward, and produces Bessel light beams.This Bessel light beam
Light distribution is as shown in Figure 4.
By geometric optics, we have obtained the salt free ligands scope formula that element produces Bessel light beamsIts
In, R is the incident radius of light beam, and D is component thickness, and g is refractive index gradient variation coefficient.Thus formula understand, component thickness with
Refractive index parameter has identical modulation effect to Bessel light, reduce thickness D or refractive index parameter can increase salt free ligands away from
From.
The amplitude transmittance of the optical element of the present invention is t (r)=exp (- ikgDr), wherein, i is imaginary number,
K is incident beam wave vector, and g is planar lens refractive index gradient variation coefficient, and D is planar lens thickness, and r is away from planar lens
The distance of the heart.Modulating the salt free ligands scope of directional light generation Bessel light beams isWhen multigroup optics of the invention
When element is overlapped mutually (guarantee center superposition), because element is planar lens, can closely it connect each other, its amplitude is saturating
The product that rate is equal to each element amplitude transmittance is crossed, the parameter (gD) during superposition equivalent to discrete component increases, generation
The salt free ligands scope of Bessel light beams accordingly diminishes.
In use, the multigroup optical element of the invention of available refractive index variable gradient identical (thickness is identical or differs)
It is overlapped, it is also possible to which the different multigroup optical element (thickness is identical or differs) of the invention of variations in refractive index gradient is carried out
Superposition.As shown in figure 5, the present embodiment is by two thickness are identical, variations in refractive index gradient is different optical element of the invention
It is overlapped mutually and uses, generates the Bessel light of different the non diffracting distances.
The optical element of the present invention can be soft film-form, and the film that refractive index linear gradient changes is attached into optical system
The exit facet of system, emergent light is long range Bessel light, directly produces Bessel light without extra modulation.
Claims (3)
1. a kind of can produce the optical element of long range Bessel light beams, it is characterised in that：This optical element has refractive index edge
The radially planar lens of linear graded, planar lens described in multi-disc is superimposed, and each planar lens
Variations in refractive index gradient is identical or different.
2. a kind of the optical element of long range Bessel light beams can be produced according to claim 1, it is characterised in that：It is described
Planar lens is soft film-form.
3. a kind of the optical element of long range Bessel light beams can be produced according to claim 1 or 2, it is characterised in that：
The planar lens is radial gradient index material plane lens.
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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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| CN104849779B true CN104849779B (en) | 2017-07-28 |
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| DE102017206461B4 (en) | 2017-04-13 | 2019-05-02 | Schott Ag | Apparatus and method for laser-based separation of a transparent, brittle-breaking 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 |
| 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 |
| CN111525273B (en) * | 2020-05-11 | 2021-01-26 | 北京大学 | Terahertz super-surface Bessel lens |
| CN117930518A (en) * | 2024-03-18 | 2024-04-26 | 人工智能与数字经济广东省实验室(深圳) | Non-diffraction beam array generating device and method, light source and measuring sensor |
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| CN1126706A (en) * | 1995-10-12 | 1996-07-17 | 阮慎康 | Prepn of rare-earth optical glass with radial gradient |
| JP3969699B2 (en) * | 2000-11-17 | 2007-09-05 | 日本板硝子株式会社 | Chip member for microchemical system, and microchemical system using the chip member |
| US6832028B2 (en) * | 2002-10-08 | 2004-12-14 | Innovative Technology Licensing, Llc | Liquid crystal adaptive coupler for steering a light beam relative to a light-receiving end of an optical waveguide |
| AU2003287536A1 (en) * | 2002-11-05 | 2004-06-07 | Triton Systems, Inc. | Acoustically-controlled dynamic optical lenses and gratings and methods related thereto |
| US7570432B1 (en) * | 2008-02-07 | 2009-08-04 | Toyota Motor Engineering & Manufacturing North America, Inc. | Metamaterial gradient index lens |
| JP2011170052A (en) * | 2010-02-17 | 2011-09-01 | Institute Of National Colleges Of Technology Japan | Optical device, light source device, laser process device, diffracting optical element, optical pickup, optical disk device, and laser apparatus |
| JP5401482B2 (en) * | 2011-01-28 | 2014-01-29 | 京セラドキュメントソリューションズ株式会社 | Optical scanning device and image forming apparatus having the same |
| CN102116883B (en) * | 2011-03-09 | 2015-04-15 | 华侨大学 | Novel cone lens for generating Bottle beams with periodicity |
| CN204882913U (en) * | 2015-05-27 | 2015-12-16 | 华侨大学 | Can produce optical element of long distance bessel light beam |
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