CN104199189A - Optical system capable of generating banding diffraction-free light beams - Google Patents
Optical system capable of generating banding diffraction-free light beams Download PDFInfo
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- CN104199189A CN104199189A CN201410462872.XA CN201410462872A CN104199189A CN 104199189 A CN104199189 A CN 104199189A CN 201410462872 A CN201410462872 A CN 201410462872A CN 104199189 A CN104199189 A CN 104199189A
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Abstract
The invention discloses an optical system capable of generating banding diffraction-free light beams. The optical system comprises an optical platform. A laser is disposed on the optical platform, and a short-focal-length lens, a long-focal-length lens, an elliptical-aperture film and an axicon are sequentially arranged along a laser path of the laser. The focus of the short-focal-length lens is superposed with the focus of the long-focal-length lens; the elliptical-aperture film is close to the axicon; the diameter of a light beam irradiating the elliptical-aperture film from the long-focal-length lens is larger than that of a short axis of an elliptical hole of the elliptical-aperture film. The optical system is capable of conveniently generating the banding diffraction-free light beams and provides a new way for generating the banding diffraction-free light beams in low-cost, simple and effective manner. During actual use, the optical system has a special significance in improving optical nondestructive detecting and detecting efficiency in bar code scanning.
Description
Technical field
The present invention relates to a kind of optical system that circle Gaussian beam is focused on to the banded Beams of generation.
Background technology
Beams is a kind of light beam that lateral light field distribution does not change with propagation distance and Light Energy is concentrated in free-space propagation process.Characteristic because its intensity and spot size in communication process remain unchanged, is widely used in laser boring, and optics is captured and operation, laser imaging, interferometry, space optical communication.In experiment, produce the fairly simple method of Beams and with the direct incident axle of plane wave pyramid, obtain Beams exactly, when the plane wave amplitude inciding on axle pyramid is equally distributed plane wave, generation is exactly diffrac tion-free Bessel beam, when the distribution of amplitudes of the plane on inciding axle pyramid is plane wave heterogeneous, can obtain dissimilar Beams, for example Laguerre Gaussian beam incident axle pyramid produces high-order Bessel-Gauss light beam, and the plane wave incident axle pyramid of oval G amplitude modulation obtains without diffraction Mathieu light beam etc.
In prior art, produce the banded Beams with Mathieu beam characteristics, normally adopt traditional computer or make phase hologram sheet to obtain, its operation more complicated and cost are higher.
Summary of the invention
The object of the present invention is to provide the optical system of the banded Beams of a kind of convenient and swift generation.
To achieve these goals, the present invention adopts following technical scheme:
An optical system that produces banded Beams, comprises optical table, on this optical table, is placed with laser instrument, along the laser optical path of this laser instrument, places successively short focal length lens, long-focus lens, elliptical aperture film, axle pyramid; Wherein, the focus of above-mentioned short focal length lens and the focus of above-mentioned long-focus lens overlap; Above-mentioned elliptical aperture film nestles up above-mentioned axle pyramid; From the diameter of the light beam of the above-mentioned elliptical aperture film of above-mentioned long-focus lens directive, be greater than the minor axis diameter of the elliptical aperture of above-mentioned elliptical aperture film.
Above-mentioned laser instrument is He-Ne laser instrument.
Adopt after such scheme, when laser beam that laser instrument sends is successively after short focal length lens and long-focus lens collimator and extender, via elliptical aperture film, then normal incidence is to axle pyramid, and output forms banded Beams; The advantages such as this optical system structure is very simple, and it is high that axle pyramid has optical damage threshold, and clear aperature is large, and elliptical aperture film is cheap, very easily obtains, and therefore will produce quickly and easily banded Beams.Therefore the present invention provides a kind of low cost, succinct, effective new way for obtaining banded Beams.In actual applications, particularly, to improving optical non-destructive detection, the detection efficiency on bar code scan acquires a special sense.
Accompanying drawing explanation
Fig. 1 is the structural representation of optical system of the present invention;
Fig. 2 is the light path schematic diagram of optical system of the present invention;
Fig. 3 is the structural representation of elliptical aperture film in the present invention;
The computer simulation hot spot figure that Fig. 4 a-Fig. 4 d is optical system of the present invention;
The experiment hot spot figure that Fig. 5 a-Fig. 5 d is optical system of the present invention.
Embodiment
In order further to explain, below by specific embodiment, system of the present invention is described in detail the technical scheme of system of the present invention.
A kind of optical system that produces banded Beams of the present invention, as shown in Figure 1, there is optical table 1, on optical table 1, place laser instrument 2, along the laser optical path of this laser instrument 2, place successively short focal length lens 3, long-focus lens 4, elliptical aperture film 5 and axle pyramid 6.Wherein, laser instrument 2, short focal length lens 3, long-focus lens 4, elliptical aperture film 5 and axle pyramid 6 pass through respectively fixed support 7 supporting and locations on optical table 1.
Wherein, the focus of the focus of short focal length lens 3 and long-focus lens 4 overlaps; Elliptical aperture film 5 nestles up axle pyramid 6.
Wherein, laser instrument 2 adopts He-Ne laser instrument.
The focus of the focus of short focal length lens 3 and long-focus lens 4 overlaps, and by short focal length lens 3 and long-focus lens 4, forms a collimating and beam expanding system, and the enlargement factor of collimating and beam expanding system can regulate by choosing the different focal lengths of lens as required.Adjust the enlargement factor of collimating and beam expanding system, make to be greater than from the diameter of the light beam of long-focus lens 4 directive elliptical aperture films 5 the minor axis diameter of the elliptical aperture of elliptical aperture film 5.In order to make the banded Beams pattern of last gained more clear, beam diameter can be adjusted to the major diameter of the elliptical aperture that is greater than elliptical aperture film 5.
During work, as shown in Figure 2,3, first He-Ne laser instrument 2 is opened, laser beam forms the light beam of minor axis diameter that diameter is greater than the elliptical aperture of elliptical aperture film 5 after short focal length lens 3 and long-focus lens 4 collimator and extenders, this light beam forms oval-shaped hot spot after elliptical aperture film 5, be incident upon in the rear certain distance of axle pyramid 6 and form banded Beams, its maximum can be by formula Z without diffraction propagation distance
max≈ a/[(n-1) γ] approximate treatment obtains, and wherein a is the major axis radius (that is, the major axis radius of the elliptical aperture of elliptical aperture film 5) that incides the ellipse light spot on axle pyramid 6, and n is the refractive index of axle pyramid 6, and γ is the base angle of axle pyramid 6.The result that obtains different propagation distance place by computer simulation as shown in Figure 4 a-shown in Figure 4 d.
As embodiment, γ=10, base angle of axle pyramid 6, refractive index n=1.458 of axle pyramid 6, the major and minor axis radius of the elliptical aperture of elliptical aperture film 5 is respectively a=5mm, b=1.5mm, the focal distance f=190mm of the focal distance f=15mm of short focal length lens 3, long-focus lens 4, during experiment, according to the light path of Fig. 2, build light path system, photograph the result at different propagation distance place as shown in Fig. 5 a-Fig. 5 d.
Thus, this optical system provides a kind of low cost for obtaining banded Beams, succinct, effective method.In actual applications, particularly, to improving optical non-destructive detection, the detection efficiency on bar code scan acquires a special sense.
The product form of above-described embodiment and graphic and non-limiting system of the present invention and style, suitable variation or modification that any person of an ordinary skill in the technical field does it, all should be considered as not departing from the patent category of system of the present invention.
Claims (2)
1. an optical system that produces banded Beams, it is characterized in that: comprise optical table, on this optical table, be placed with laser instrument, along the laser optical path of this laser instrument, place successively short focal length lens, long-focus lens, elliptical aperture film, axle pyramid; Wherein, the focus of above-mentioned short focal length lens and the focus of above-mentioned long-focus lens overlap; Above-mentioned elliptical aperture film nestles up above-mentioned axle pyramid; From the diameter of the light beam of the above-mentioned elliptical aperture film of above-mentioned long-focus lens directive, be greater than the minor axis diameter of the elliptical aperture of above-mentioned elliptical aperture film.
2. a kind of optical system that produces banded Beams as claimed in claim 1, is characterized in that: above-mentioned laser instrument is He-Ne laser instrument.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410462872.XA CN104199189A (en) | 2014-09-12 | 2014-09-12 | Optical system capable of generating banding diffraction-free light beams |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410462872.XA CN104199189A (en) | 2014-09-12 | 2014-09-12 | Optical system capable of generating banding diffraction-free light beams |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741643A (en) * | 2017-11-20 | 2018-02-27 | 华侨大学 | The optical system of Mathieu light beams is produced using partially coherent light |
| CN109031682A (en) * | 2018-07-10 | 2018-12-18 | 北京润和微光科技有限公司 | The generation system and method for Diode laser, small spot based on diffraction optical element |
| CN109273864A (en) * | 2018-09-06 | 2019-01-25 | 中国科学院国家空间科学中心 | A kind of device generating millimeter wave Bezier wave beam using double-fed source |
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| CN202870391U (en) * | 2012-09-26 | 2013-04-10 | 华侨大学 | Optical system for self-reconstructing Bessel beam by using an LED light source |
| CN103217796A (en) * | 2013-03-28 | 2013-07-24 | 华侨大学 | Optical system for generating cyclic Bottle beam |
| CN203480128U (en) * | 2013-05-10 | 2014-03-12 | 华侨大学 | Optical system for self-reconstruction of periodical Bottle beam |
| CN103760673A (en) * | 2014-01-06 | 2014-04-30 | 华侨大学 | Optical system for generating approximate diffraction-free zero-order Mathieu beam |
| CN204116721U (en) * | 2014-09-12 | 2015-01-21 | 华侨大学 | A kind of optical system producing banded Beams |
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2014
- 2014-09-12 CN CN201410462872.XA patent/CN104199189A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201589894U (en) * | 2009-12-23 | 2010-09-22 | 华侨大学 | Device for generating approximate non-diffracting beams |
| CN202870391U (en) * | 2012-09-26 | 2013-04-10 | 华侨大学 | Optical system for self-reconstructing Bessel beam by using an LED light source |
| CN103217796A (en) * | 2013-03-28 | 2013-07-24 | 华侨大学 | Optical system for generating cyclic Bottle beam |
| CN203480128U (en) * | 2013-05-10 | 2014-03-12 | 华侨大学 | Optical system for self-reconstruction of periodical Bottle beam |
| CN103760673A (en) * | 2014-01-06 | 2014-04-30 | 华侨大学 | Optical system for generating approximate diffraction-free zero-order Mathieu beam |
| CN204116721U (en) * | 2014-09-12 | 2015-01-21 | 华侨大学 | A kind of optical system producing banded Beams |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107741643A (en) * | 2017-11-20 | 2018-02-27 | 华侨大学 | The optical system of Mathieu light beams is produced using partially coherent light |
| CN109031682A (en) * | 2018-07-10 | 2018-12-18 | 北京润和微光科技有限公司 | The generation system and method for Diode laser, small spot based on diffraction optical element |
| CN109273864A (en) * | 2018-09-06 | 2019-01-25 | 中国科学院国家空间科学中心 | A kind of device generating millimeter wave Bezier wave beam using double-fed source |
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