CN202870391U - Optical system for self-reconstructing Bessel beam by using an LED light source - Google Patents
Optical system for self-reconstructing Bessel beam by using an LED light source Download PDFInfo
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- CN202870391U CN202870391U CN2012204952607U CN201220495260U CN202870391U CN 202870391 U CN202870391 U CN 202870391U CN 2012204952607 U CN2012204952607 U CN 2012204952607U CN 201220495260 U CN201220495260 U CN 201220495260U CN 202870391 U CN202870391 U CN 202870391U
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Abstract
The utility model discloses an optical system for self-reconstructing Bessel beam by using an LED light source. The optical system comprises an optical platform, a blue LED lamp bead, an LED condensing lens, a condenser tube, a diaphragm, a short focal length lens, a long focal length lens, an axicon, and a non-transparent obstacle. The distance between the short focal length lens and the long focal length lens is the sum of the focal lengths of the two lenses, and the centers of the LED condensing lens, the condenser tube, the diaphragm, the short focal length lens, the long focal length lens, the axicon, and the non-transparent obstacle are arranged on the optical axis. The adopted optical elements such as the blue LED lamp bead and the LED condensing lens have low fabrication cost and are easily obtained, thus the relatively convenient and quick method is provided to self reconstruct the Bessel beam by an incoherent light source, therefore the incoherent light source generates the non-diffracting beam to enable to simultaneously operate a number of particles and furthermore provide the condition for multi-level particle operation and optical micromanipulation. The optical system has great significance to the study of the incoherent light source.
Description
Technical field
The utility model relates to and a kind ofly utilizes incoherent led light source to break the barriers rear diffrac tion-free Bessel beam from the optical system of rebuilding.
Background technology
Since Durnin in 1987 proposes diffrac tion-free Bessel beam first, this class light beam just, concentration of energy little with its main spot size, good directionality, optical field distribution the characteristics such as variation have not attracted domestic and international scientific research personnel's extensive concern with transmission range.In recent years, because key property-reconstitution properties that the ordinary beam of light such as Gaussian beam that diffrac tion-free Bessel beam has never have has obtained many important achievements at bioengineering and medical domain.
When a particle is caught by Beams, particle will make near its optical field distribution distorted, but a distance Beams can be rebuild behind particle, can catch other particle so again, the reconstitution properties of Beams becomes possibility so that Beams operates the stage construction particle simultaneously.Up to the present people are to launch on the basis of adopting coherent source (laser) the Bessel light beam from rebuilding the research of doing, and at home and abroad there is no report for the certainly reconstruction research of incoherent led light source diffraction light-free.LED is as a kind of New Solid light source, has energy-saving and environmental protection, the life-span is long, reliability and durability, the response time fast and the plurality of advantages such as high-color rendering, and LED is cheap, very easily obtains, and unique market advantage is arranged.The aspects such as the characteristic that incoherent light source can be rebuild is controlled at the particle stage construction, optics microoperation have high using value.
The utility model content
The purpose of this utility model is to provide a kind of and realizes that with led light source the Bessel light beam is from the optical system of rebuilding.
To achieve these goals, the utility model adopts following technical scheme:
Realize that with led light source the Bessel light beam from the optical system of rebuilding, comprises optical table, optical bench, LED lamp pearl, LED collector lens, light collecting barrel, diaphragm, short focal length lens, long-focus lens, axle pyramid and light tight barrier;
Wherein, the LED collector lens props up an end of being located at optical table by optical bench, the end that the LED collector lens is set take optical table as after, before the other end is, the LED collector lens covers at outside the LED lamp pearl and converges rear trend of purchasing the place ahead in order to the light that LED lamp pearl is sent, and light collecting barrel, diaphragm, short focal length lens, long-focus lens, axle pyramid and light tight barrier prop up the place ahead of being located at the LED collector lens successively by optical bench respectively;
Light collecting barrel is the taper light collecting barrel, and the opening sleeve of LED collector lens is connected in the large end of this taper light collecting barrel, and the small end of this taper light collecting barrel has in order to the aperture of beam projecting to the place ahead;
All on optical axis, the space D of light collecting barrel and diaphragm will satisfy at the center of LED collector lens, light collecting barrel, diaphragm, short focal length lens, long-focus lens, axle pyramid and light tight barrier
Condition, wherein b is the hole diameter of light collecting barrel small end, d is the diameter of diaphragm, λ is the incident light wavelength; The spacing of diaphragm and short focal length lens is less than 35cm; The spacing of short focal length lens and long-focus lens is both focal length sums; The spacing of axle pyramid and long-focus lens is less than 18m, and the distance between axle pyramid and the light tight barrier is less than 13cm.
Described LED collector lens be can with the collector lens of LED lamp pearl gummed.
The radius that described light collecting barrel is used for the large end that socket-connects with the LED collector lens is slightly larger than or equals the opening radius of described LED collector lens; The radius of described aperture is about 1mm.
Described diaphragm is the adjustable circular hole diaphragm of radius, in order to improve the coherence of LED light field.
Described LED lamp pearl adopts spectrum width less than the LED lamp pearl of 80nm.
Described LED lamp pearl is the blue LED lamp pearl.
After adopting such scheme, the lightening LED lamp pearl, the light that LED lamp pearl sends enters light collecting barrel after the LED collector lens converges, light passes through Multi reflection and converges and reaches the more uniform state of intensity distributions from the aperture outgoing of light collecting barrel in light collecting barrel, the coherence is improved through the diaphragm light field space, again by inciding on the axle pyramid near directional light behind the collimating and beam expanding system that is consisted of by short focal length lens and long-focus lens, behind the axle pyramid, form approximate without diffraction region in the certain distance, in without diffraction region, place light tight barrier, therefore the Bessel light beam can not stop to propagate, walking around on the contrary light tight barrier continues to propagate, and cast a slice shadow region at the barrier rear, but very fast Bessel light beam returns to again original light distribution, and reconstruction has namely occured in without diffraction region.
The optical elements such as the LED lamp pearl that the utility model adopts, LED collector lens are cheap, obtain easily, for realizing that with incoherent light source the Bessel light beam is from the comparatively conveniently method that provides is provided, make incoherent light source generation Beams can operate simultaneously a plurality of particles and become possibility, for stage construction is controlled particle, the optics microoperation provides condition, be significant for the research of incoherent light source.
Description of drawings
Fig. 1 is the structural representation of the utility model optical system;
Fig. 2 is light path synoptic diagram of the present utility model (omitting LED collector lens 4).
Embodiment
Be described in further detail below in conjunction with structure and the principle of accompanying drawing to the utility model system.
The utility model realizes that with led light source the Bessel light beam from the optical system of rebuilding, as shown in Figure 1, comprises optical table 1, optical bench 2, LED lamp pearl 3, LED collector lens 4, light collecting barrel 5, diaphragm 6, short focal length lens 7, long-focus lens 8, light tight axle pyramid 9 and barrier 10.Wherein, LED lamp pearl 3 can select spectrum width less than the LED lamp pearl of 80nm, and present embodiment is selected the blue LED lamp pearl, and spectrum width is 41nm.
Wherein, LED collector lens 4 is located at an end of optical table 1 by 2 of optical benchs, the end that LED collector lens 4 is set take optical table 1 as after, before the other end is, LED collector lens 4 covers at outside the blue LED lamp pearl 3 and converges rear trend of purchasing the place ahead in order to the light that blue LED lamp pearl 3 is sent, light collecting barrel 5, diaphragm 6, short focal length lens 7, long-focus lens 8, light tight axle pyramid 9 and barrier 10 prop up the place ahead of being located at LED collector lens 4 successively by optical bench 2 respectively, and LED collector lens 4, light collecting barrel 5, diaphragm 6, short focal length lens 7, long-focus lens 8, the center of axle pyramid 9 and light tight barrier 10 is all on optical axis.
Wherein: light collecting barrel 5 is the taper light collecting barrel that an end diameter is large, other end diameter is little, the opening radius of the radius ratio LED collector lens 4 of the large end of this taper light collecting barrel (the opening radius of LED collector lens 4 is that LED collector lens 4 is towards the radius of this end in the place ahead) is bigger, or the radius of the large end of taper light collecting barrel equates with the opening radius of LED collector lens 4, the opening of LED collector lens 4 (that is, LED collector lens 4 is towards this end in the place ahead) is socketed in the large end of taper light collecting barrel; The small end of taper light collecting barrel 5 (near an end of diaphragm 6) forms in order to the aperture of beam projecting to the place ahead, and the radius of this aperture (being the inside radius of small end) is about 1mm;
The spacing of diaphragm 6 and short focal length lens 7 is less than 35cm, and in the present embodiment, diaphragm 6 can be selected 30cm with the spacing of short focal length lens 7;
Short focal length lens 7 and long-focus lens 8 expand collimating by the LED light behind the diaphragm 6 in order to consist of telescopic system, and short focal length lens 7 is the focal length sum of short focal length lens 7 and long-focus lens 8 with the spacing of long-focus lens 8;
The spacing of axle pyramid 9 and long-focus lens 8 is less than 18cm, in the present embodiment, and the optional 12cm that selects of this spacing.
Required distance between axle pyramid 9 and the light tight barrier 10 is less than 13cm, in the present embodiment, and the optional 9cm that selects of this spacing.In the utility model, light tight barrier 10 can adopt film.
As shown in Figure 2, be the light path synoptic diagram of the utility model system.The light that LED lamp pearl 3 sends enters light collecting barrel 5 after LED collector lens 4 (not shown)s converge, light is interior through Multi reflections and converge and reach the more uniform state of intensity distributions from the aperture outgoing of light collecting barrel 5 at light collecting barrel 5, the process radius is the diaphragm 6 of a, light field space the coherence be improved, by inciding on the axle pyramid near directional light behind the collimating and beam expanding system that is consisted of by short focal length lens 7 and long-focus lens 8, in axle pyramid 9 rear certain distances, form approximate without diffraction Bessel zone again.Maximum the non diffracting distance can be by formula Z
Max≈ R/[(n-1) γ] calculate, wherein n is the refractive index of axle pyramid material, and γ is axle pyramid base angle, and R is the beam radius of incident axle pyramid.Minimum certainly reconstruction distance can be by formula Z
Min=a/2 (n-1) γ calculates, and wherein n is the refractive index of axle pyramid material, and γ is axle pyramid base angle, and a is the diameter of light tight barrier 10.
Structure by Fig. 1 is adjusted each optical element at optical table 1, first diaphragm 6 small apertures are transferred to maximum during adjusting, the light intensity maximum that sees through like this diaphragm 6 is convenient to the adjusting of back device, then allows optical axis vertically pass through the center of diaphragm 6, short focal length lens 7, long-focus lens 8, axle pyramid 9 optical elements.Need the small aperture of diaphragm 6 is transferred to 0.2mm after regulating each optical element, can improve like this coherence of light field, in axle pyramid 9 rear a bit of distances, can be observed more approximate diffrac tion-free Bessel beam, in being similar to without diffraction Bessel zone, place light tight barrier 10, can very clearly see whole from the reconstruction process by regulating microscope.
Claims (6)
1. realize that with led light source the Bessel light beam from the optical system of rebuilding, is characterized in that: comprise optical table, optical bench, LED lamp pearl, LED collector lens, light collecting barrel, diaphragm, short focal length lens, long-focus lens, axle pyramid and light tight barrier;
Wherein, the LED collector lens props up an end of being located at optical table by optical bench, the end that the LED collector lens is set take optical table as after, before the other end is, the LED collector lens covers at outside the LED lamp pearl and converges rear trend of purchasing the place ahead in order to the light that LED lamp pearl is sent, and light collecting barrel, diaphragm, short focal length lens, long-focus lens, axle pyramid and light tight barrier prop up the place ahead of being located at the LED collector lens successively by optical bench respectively;
Light collecting barrel is the taper light collecting barrel, and the opening sleeve of LED collector lens is connected in the large end of this taper light collecting barrel, and the small end of this taper light collecting barrel has in order to the aperture of beam projecting to the place ahead;
All on optical axis, the space D of light collecting barrel and diaphragm will satisfy at the center of LED collector lens, light collecting barrel, diaphragm, short focal length lens, long-focus lens, axle pyramid and light tight barrier
Condition, wherein b is the hole diameter of light collecting barrel small end, d is the diameter of diaphragm, λ is the incident light wavelength; The spacing of diaphragm and short focal length lens is less than 35cm; The spacing of short focal length lens and long-focus lens is both focal length sums; The spacing of axle pyramid and long-focus lens is less than 18m, and the distance between axle pyramid and the light tight barrier is less than 13cm.
2. according to claim 1ly realize that with led light source the Bessel light beam from the optical system of rebuilding, is characterized in that: described LED collector lens for can with the collector lens of LED lamp pearl gummed.
3. according to claim 1ly realize that with led light source the Bessel light beam from the optical system of rebuilding, is characterized in that: the radius that described light collecting barrel is used for the large end that socket-connects with the LED collector lens is slightly larger than or equals the opening radius of described LED collector lens; The radius of described aperture is about 1mm.
4. according to claim 1 with the optical system of led light source realization Bessel light beam from reconstruction, it is characterized in that: described diaphragm is the adjustable circular hole diaphragm of radius, in order to improve the coherence of LED light field.
5. according to claim 1 with the optical system of led light source realization Bessel light beam from reconstruction, it is characterized in that: described LED lamp pearl adopts spectrum width less than the LED lamp pearl of 80nm.
6. according to claim 5 with the optical system of led light source realization Bessel light beam from reconstruction, it is characterized in that: described LED lamp pearl is the blue LED lamp pearl.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012204952607U CN202870391U (en) | 2012-09-26 | 2012-09-26 | Optical system for self-reconstructing Bessel beam by using an LED light source |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012204952607U CN202870391U (en) | 2012-09-26 | 2012-09-26 | Optical system for self-reconstructing Bessel beam by using an LED light source |
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| CN202870391U true CN202870391U (en) | 2013-04-10 |
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| CN2012204952607U Expired - Fee Related CN202870391U (en) | 2012-09-26 | 2012-09-26 | Optical system for self-reconstructing Bessel beam by using an LED light source |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102902066A (en) * | 2012-09-26 | 2013-01-30 | 华侨大学 | Optical system for achieving Bessel light beam self reconstruction by utilizing light-emitting diode (LED) light source |
| CN104199189A (en) * | 2014-09-12 | 2014-12-10 | 华侨大学 | Optical system capable of generating banding diffraction-free light beams |
| CN105824120A (en) * | 2016-03-04 | 2016-08-03 | 华侨大学 | Incoherent light source and non-diffraction beam imaging system |
-
2012
- 2012-09-26 CN CN2012204952607U patent/CN202870391U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102902066A (en) * | 2012-09-26 | 2013-01-30 | 华侨大学 | Optical system for achieving Bessel light beam self reconstruction by utilizing light-emitting diode (LED) light source |
| CN104199189A (en) * | 2014-09-12 | 2014-12-10 | 华侨大学 | Optical system capable of generating banding diffraction-free light beams |
| CN105824120A (en) * | 2016-03-04 | 2016-08-03 | 华侨大学 | Incoherent light source and non-diffraction beam imaging system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130410 Termination date: 20130926 |