CN202794708U - Optical system for generating approximate non-diffracting Bessel beam by light emitting diode (LED) - Google Patents
Optical system for generating approximate non-diffracting Bessel beam by light emitting diode (LED) Download PDFInfo
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- CN202794708U CN202794708U CN2012203851238U CN201220385123U CN202794708U CN 202794708 U CN202794708 U CN 202794708U CN 2012203851238 U CN2012203851238 U CN 2012203851238U CN 201220385123 U CN201220385123 U CN 201220385123U CN 202794708 U CN202794708 U CN 202794708U
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Abstract
The utility model discloses an optical system for generating an approximate non-diffracting Bessel beam by a light emitting diode (LED), comprising an LED lamp bead, an LED focusing lens, a focusing cylinder, a diaphragm, a short-focus lens, a long-focus lens and an axicon which are sequentially arranged, wherein the distance between the short-focus lens and the long-focus lens is identical to sum of focuses of the short-focus lens and the long-focus lens; and centers of the LED focusing lens, the focusing cylinder, the diaphragm, the short-focus lens, the long-fucus lens and the axicon are arranged on an optical axis. The utility model provides a simple and convenient method for generating the approximate non-diffracting Bessel beam by an incoherent source, and has a practical guiding significant for study of particle capture, particle confinement and optic coherence tomography of the approximate non-diffracting Bessel beam generated by the incoherent source.
Description
Technical field
The utility model relates to Optical System Design, specifically a kind of optical system that produces approximate non-diffraction Bessel beam with LED.
Background technology
Bessel beam (Bessel light beam) is a kind of Beams, maximum characteristic is when free-space propagation, the center spot size can not change along with propagation distance, and central light strength is high, run into barrier can rebuild, these characteristics are so that bessel beam is used in wide spectrum, such as optical guidance, statistical physics and the atom optics of particle confinement, particle and the optics pulling force that proposes recently etc.Bessel beam is this focus studying in decades.
Up to the present people's research that bessel beam is done nearly all is to launch on the basis of adopting coherent source (laser), also only have in recent years several foreign scholars to begin to produce approximate non-diffraction Bessel beam and obtain certain achievement with incoherent light sources such as halogen lamp, super-radiance light emitting diodes, the approximate non-diffraction Bessel beam of gained can be used for particle confinement and optical guidance equally.Broadband is similar to the resolution that can improve image without diffraction Bezier light in Optical coherence tomography (OCT), produces approximate non-diffraction Bessel beam with the dried light of part and has realistic meaning.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.By feat of swift and violent growth momentum, if can produce approximate non-diffraction Bessel beam by enough LED, may push the study and use of approximate non-diffraction Bessel beam to another climax.
The utility model content
The purpose of this utility model is to provide the noncoherent led light source of a kind of usefulness to produce the optical system of approximate non-diffraction Bessel beam.
To achieve these goals, the utility model adopts following technical scheme:
Produce the optical system that is similar to non-diffraction Bessel beam with LED, comprise optical table, optical bench, LED lamp pearl, LED collector lens, light collecting barrel, diaphragm, short condenser lens, long condenser lens and axle pyramid;
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 and axle pyramid 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;
The center of LED collector lens, light collecting barrel, diaphragm, short focal length lens, long-focus lens and axle pyramid is all on optical axis; The space D of light collecting barrel and diaphragm will satisfy
Condition, wherein b is the internal diameter of aperture of the small end of light collecting barrel, d is the diameter of diaphragm, λ is the incident light wavelength; The spacing of diaphragm and short focal length lens is less than 10cm; 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 10cm.
Described LED lamp pearl is glued on the medial surface of LED collector lens.
The internal diameter 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 diameter of described LED collector lens; The diameter of described aperture is about 2mm.
Described diaphragm is the adjustable circular hole diaphragm of diameter, in order to improve the coherence of LED light field.
Described short focal length lens and long-focus lens expand collimating by the LED light behind the described diaphragm in order to consist of telescopic system.
Described LED lamp pearl adopts spectrum width less than the LED lamp pearl of 80nm.
Described LED lamp pearl is green light LED lamp pearl.
After adopting such scheme, the lightening LED lamp pearl, light modulation, collimation, the light that LED lamp pearl sends enters light collecting barrel after the LED collector lens converges, light passes through Multi reflection and converges the more uniform state of intensity distributions that reaches in light collecting barrel, afterwards from the aperture outgoing of light collecting barrel, be improved through the light field space coherence behind the circular hole of diaphragm, again by behind the collimating and beam expanding system that is consisted of by short focal length lens and long-focus lens near directional light, last incident axle pyramid also forms approximate non-diffraction Bessel beam behind the axle pyramid.
The element costs such as the LED lamp pearl that the utility model adopts, LED collector lens are extremely low, provide a kind of simple and efficient method for produce approximate non-diffraction Bessel beam with incoherent light source.The research of the approximate non-diffraction Bessel beam that utilizes incoherent light source to produce being carried out capture of particles, imprison and Optical coherence tomography has real directive significance.
Description of drawings
Fig. 1 is structural representation of the present utility model;
Fig. 2 is light path synoptic diagram of the present utility model.
Embodiment
The utility model produces the optical system of approximate non-diffraction Bessel beam with LED, as shown in Figure 1, comprise optical table 1, optical bench 2, green light LED lamp pearl 3, LED collector lens 4, light collecting barrel 5, diaphragm 6, short focal length lens 7, long-focus lens 8 and axle pyramid 9.Wherein, LED lamp pearl can select spectrum width less than the LED lamp pearl of 80nm, and present embodiment is selected green light LED lamp pearl, and spectrum width is 36nm.
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, green light LED lamp pearl 3 is glued at the position of (this one side towards the place ahead) approximate centre on the medial surface of LED collector lens 4, the light that green light LED lamp pearl 3 is sent by LED collector lens 4 converges rear trend of purchasing the place ahead, light collecting barrel 5, diaphragm 6, short focal length lens 7, long-focus lens 8 and axle pyramid 9 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, the center of long-focus lens 8 and axle pyramid 9 is all on optical axis.
Diaphragm 6 is the adjustable circular hole diaphragm of diameter, and in order to improve the coherence of LED light field, for reaching coherence's requirement, diaphragm 6 requires to satisfy with the space D of light collecting barrel 5
Condition, wherein b is the internal diameter of aperture of the small end of light collecting barrel 5, d is the diameter of diaphragm, λ is the incident light wavelength;
For reducing the luminous energy loss behind the diaphragm, the spacing of diaphragm and short focal length lens requires less than 10cm, and in the present embodiment, diaphragm 6 can be selected 6cm 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;
Axle pyramid 9 requires less than 10cm with the spacing of long-focus lens 8, in the present embodiment, and the optional 6cm that selects of this spacing.
During work, as shown in Figure 2, the light that green light LED lamp pearl 3 sends enters light collecting barrel 5 after LED collector lens 4 converges, light is at light collecting barrel 5 interior process Multi reflections and converge the more uniform state of intensity distributions that reaches, afterwards from the aperture outgoing of light collecting barrel 5, be improved through the light field space coherence behind the circular hole of diaphragm 6, again by behind the collimating and beam expanding system that is consisted of by short focal length lens 7 and long-focus lens 8 near directional light, last incident axle pyramid 9 and at the approximate non-diffraction Bessel beam (dash area of Fig. 2) of axle pyramid 9 rear formation.
Need before working LED lamp pearl 3 and LED collector lens 4 gummeds, and guarantee to work.Lightening LED lamp pearl 3 during work is adjusted each element by the structure of Fig. 1 at optical table 1 after stable.First the aperture of diaphragm 6 is put into maximum during adjustment, the light intensity that see through diaphragm this moment is large, is convenient to the adjusting of device, allows optical axis vertically by diaphragm 6, the center of lens 7, the elements such as 8.Need diaphragm 6 diameters are transferred to 0.1mm after regulating element, can improve like this coherence of light field, so behind axle pyramid 9, just can be observed more approximate non-diffraction Bessel beam in the segment distance.
Claims (7)
1. produce the optical system of approximate non-diffraction Bessel beam with LED, it is characterized in that: comprise optical table, optical bench, LED lamp pearl, LED collector lens, light collecting barrel, diaphragm, short condenser lens, long condenser lens and axle pyramid;
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 and axle pyramid 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;
The center of LED collector lens, light collecting barrel, diaphragm, short focal length lens, long-focus lens and axle pyramid is all on optical axis; The space D of light collecting barrel and diaphragm will satisfy
Condition, wherein b is the internal diameter of aperture of the small end of light collecting barrel, d is the diameter of diaphragm, λ is the incident light wavelength; The spacing of diaphragm and short focal length lens is less than 10cm; 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 10cm.
2. according to claim 1ly produce the optical system of approximate non-diffraction Bessel beam with LED, it is characterized in that: described LED lamp pearl is glued on the medial surface of LED collector lens.
3. the optical system that produces approximate non-diffraction Bessel beam with LED according to claim 1 is characterized in that: the internal diameter 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 diameter of described LED collector lens; The diameter of described aperture is about 2mm.
4. according to claim 1ly produce the optical system of approximate non-diffraction Bessel beam with LED, it is characterized in that: described diaphragm is the adjustable circular hole diaphragm of diameter.
5. according to claim 1ly produce the optical system of approximate non-diffraction Bessel beam with LED, it is characterized in that: described short focal length lens and long-focus lens expand collimating by the LED light behind the described diaphragm in order to consist of telescopic system.
6. the optical system that produces approximate non-diffraction Bessel beam with LED according to claim 1, it is characterized in that: described LED lamp pearl adopts spectrum width less than the LED lamp pearl of 80nm.
7. according to claim 6ly produce the optical system of approximate non-diffraction Bessel beam with LED, it is characterized in that: described LED lamp pearl is green light LED lamp pearl.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203851238U CN202794708U (en) | 2012-08-03 | 2012-08-03 | Optical system for generating approximate non-diffracting Bessel beam by light emitting diode (LED) |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203851238U CN202794708U (en) | 2012-08-03 | 2012-08-03 | Optical system for generating approximate non-diffracting Bessel beam by light emitting diode (LED) |
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| Publication Number | Publication Date |
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| CN202794708U true CN202794708U (en) | 2013-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2012203851238U Expired - Fee Related CN202794708U (en) | 2012-08-03 | 2012-08-03 | Optical system for generating approximate non-diffracting Bessel beam by light emitting diode (LED) |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102819111A (en) * | 2012-08-03 | 2012-12-12 | 华侨大学 | Optical system for generating approximate non-diffracting Bessel beam by LED (Light-Emitting Diode) |
| CN105807433A (en) * | 2016-05-13 | 2016-07-27 | 华侨大学 | Optical system for generating partially coherent Hollow Beam |
| CN108020925A (en) * | 2017-11-20 | 2018-05-11 | 华侨大学 | A kind of method and optical system that caustic light beam is produced using LED light source |
-
2012
- 2012-08-03 CN CN2012203851238U patent/CN202794708U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102819111A (en) * | 2012-08-03 | 2012-12-12 | 华侨大学 | Optical system for generating approximate non-diffracting Bessel beam by LED (Light-Emitting Diode) |
| CN105807433A (en) * | 2016-05-13 | 2016-07-27 | 华侨大学 | Optical system for generating partially coherent Hollow Beam |
| CN105807433B (en) * | 2016-05-13 | 2018-07-20 | 华侨大学 | A kind of optical system generating partially coherent Hollow Beam |
| CN108020925A (en) * | 2017-11-20 | 2018-05-11 | 华侨大学 | A kind of method and optical system that caustic light beam is produced using LED light source |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130313 Termination date: 20130803 |