CN203054353U - Radial or angular polarized self-focusing Airy beam generation apparatus - Google Patents
Radial or angular polarized self-focusing Airy beam generation apparatus Download PDFInfo
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- CN203054353U CN203054353U CN 201320027094 CN201320027094U CN203054353U CN 203054353 U CN203054353 U CN 203054353U CN 201320027094 CN201320027094 CN 201320027094 CN 201320027094 U CN201320027094 U CN 201320027094U CN 203054353 U CN203054353 U CN 203054353U
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Abstract
The utility model relates to a radial or angular polarized self-focusing Airy beam generation apparatus and belongs to the optical technology application field. A laser emits a collimating Gauss beam. The beam is adjusted by a polarizing film and then a linearly-polarized Gauss beam is obtained. After passing through a spectroscope, generated transmission beam is vertically incident to a spatial light modulator which is loaded with a phase information graph. After carrying out phase modulation through a liquid crystal display of the spatial light modulator, the beam is emitted as a reflection mode. After passing through the spectroscope, the generated reflected beam is converged through a Fourier transform convex lens and the linearly-polarized self-focusing Airy beam is obtained via an annular diaphragm. A polarization converter is placed behind the annular diaphragm and is adjusted into the radial or angular polarization. After the beam passes through the polarization converter, the radial or angular polarized self-focusing Airy beam is obtained. The radial or angular polarized self-focusing Airy beam generation apparatus of the utility model possesses the following characteristics that the structure is simple; adjustment is easy; stability is good. The obtained beam can be applied in fields of particle trapping, biomedicine and the like.
Description
Technical field
The utility model relate to a kind of generation radially with the device of angle polarization self-focusing Airy light beam, the light beam that obtains can be applicable to fields such as particle capture, biomedicine, belongs to the applied optics technical field.
Background technology
The symmetrical Airy light beam of circle has caused people's very big interest and extensive concern with the character of its distinctive self-focusing, is also referred to as self-focusing Airy light beam.So-called self-focusing refers to light beam not by the focusing optical element and causes light beam to focus in the transmission course in free space or medium by himself transport property.Simultaneously, the self-focusing phenomenon of Airy light beam is also very special, and the light intensity of light beam is lower before focusing, and increases rapidly in focus place light intensity, and energy accelerates to concentrate, and the light intensity maximal value at focus place can reach peaked dozens or even hundreds of times of initial Airy light beam light intensity.The above-mentioned characteristic of self-focusing Airy light beam makes it have very large potential using value in fields such as biomedicine treatment, optical microphotograph operations.In recent years, self-focusing Airy light beam also is used to carry out particle capture and controls.Compare with general light forceps device, because the self-focusing characteristic of Airy light beam, after the object lens under identical numerical aperture condition focused on, self-focusing Airy light beam can obtain littler spot radius, stronger light distribution reaches darker depth of focus.The Airy light beam of self-focusing is solid light beam at the focus place, when specifically being applied to the optics imprison of particulate, is merely able to catch those refractive indexes greater than the particulate of surrounding medium at the focus place, catches less than the particulate of surrounding medium and be not suitable for refractive index.Therefore, it is zero hollow beam that the solid light beam of self-focusing Airy light beam at the focus place is transformed into axial light intensity, can greatly expand self-focusing Airy light beam in the application in a lot of fields.As for particle capture, not only can break through the restriction of the suffered above-mentioned refractive index condition of self-focusing Airy light beam, and can weaken the scattering of light effect, farthest reduce the optics of imprison particle is added fire damage, improve optics imprison efficient.
In recent years, the vector beam with spatial variations polarisation distribution has caused the extensive concern of academia because of its optical characteristics that has and huge potential using value.Vector beam can be divided into even polarization and non-homogeneous light beam, and column vector beam is exactly the column vector beam with the non-homogeneous polarization state in space of a quasi-representative.Column vector beam with its under high-NA focuses on characteristic and catch at particle, optical storage of data, material heat treatment, high-resolution imaging, electronics are accelerated, important application on electricity slurry focusing, Laser Processing and the free space optical communication, have obtained extensive and deep research.Radial polarisation and angle light beam are more special two kinds of polarization form in the column vector beam.Radial polarisation light owing to its polarization state about the symmetry of optical axis and to exist axle to go up a light intensity all the time be that characteristics such as zero receive much concern, its on the beam cross-section more arbitrarily the local polarization state on (except the central point) be linear polarization, but the polarization direction is along radial direction; The angle light beam also is linear polarization in the local polarization state on arbitrarily a bit on its beam cross-section, but polarization direction and radial direction quadrature.At present, the method that produces post vector light beam in experiment has many, whether relates to the amplification media according to production method, can be classified as initiatively and passive two classes.Initiatively production method relates to and uses that equipment vibrates laser in the laser cavity in post vector polarization mode, as use in the chamber axial birefringence assembly or utilize tapered lens and axial cavity that the Brewster corner reflector is created in dichroism assembly etc.; Passive production method is as utilizing optical fiber or utilize LCD space light modulator or polarization converter etc. in free space.
Summary of the invention
The purpose of this utility model is to overcome the deficiency that prior art exists, for technical fields such as particle is caught, biomedical micro-nano operation provide a kind of have significant application value radially with the generation device of angle polarization self-focusing Airy light beam, this device has simple in structure, be easy to adjust the characteristics of good stability.
For achieving the above object, the technical solution adopted in the utility model provides a kind of generation radially or the device of angle polarization self-focusing Airy light beam, laser instrument sends the collimation Gaussian beam, through polaroid light beam is carried out the polarization state adjustment, obtains the linear polarization Gaussian beam of polarization in a certain direction; Described linear polarization Gaussian beam is by behind the spectroscope, and the transmitted light beam vertical incidence that produces to the spatial light modulator that has loaded phase information figure, is carried out position in the spatial light modulator LCDs and modulate mutually afterwards to reflect the mode outgoing; Again through spectroscope, after the folded light beam that produces assembled by the Fourier transform convex lens, through annular diaphragm, obtain linear polarization self-focusing Airy light beam; Described annular diaphragm is arranged on the focus place of convex lens; Place polarization converter behind annular diaphragm, the polarization state of polarization converter is adjusted into radially or the angle polarization, described linear polarization self-focusing Airy light beam obtains radially or angle polarization self-focusing Airy light beam after by polarization converter.
Described laser instrument is the diode pumped solid state laser of adjustable power.
Described spectroscopical transmissivity and reflectivity are 50%.
Described spatial light modulator is reflective spatial light modulator, by connected computing machine input phase information figure.
The light transmission part of described annular diaphragm is the annular region of diaphragm, and the diaphragm central circular is shading light part, the inside and outside fixed apertures of diaphragm.
Described polarization converter is liquid crystal voltage modulation system polarization converter, by the computer control on-load voltage, regulates light polarization, realizes radial polarisation or angle polarization.
Because the utilization of technique scheme, the utility model compared with prior art has following advantage:
1, the Airy light beam that produces does not need can carry out self-focusing by the focusing optical element, and light intensity is lower before the focus, and focus place light intensity increases rapidly, and concentration of energy can accurately be located utilization.
2, directly utilize the linear polarization Gaussian beam to produce radially and angle polarization self-focusing Airy light beam, method is simple; Apparatus structure is simple, is easy to adjust good stability.
Description of drawings
Fig. 1 is the structural representation of the radially a kind of or angle polarization self-focusing Airy beam generated device that provides of the utility model embodiment;
Fig. 2 carries out the position phase information figure of modulation mutually to light beam at the utility model embodiment being used for of providing;
Fig. 3 is the structural representation of the annular diaphragm that provides of the utility model embodiment;
Fig. 4 is the surface of intensity distribution (propagation distance z=0) of the radial polarisation self-focusing Airy light beam of generation among the utility model embodiment 1;
Fig. 5 is the surface of intensity distribution (propagation distance z=0.25m) of the radial polarisation self-focusing Airy light beam of generation among the utility model embodiment 1;
Accompanying drawing 6 is that the radial polarisation self-focusing Airy light beam of generation among the utility model embodiment 1 is at the surface of intensity distribution (propagation distance z=0.85m) at its self-focusing focus place;
Fig. 7 is that the radial polarisation self-focusing Airy light beam that produces among the utility model embodiment 1 is at the surface of intensity distribution (propagation distance z=1.50m);
Fig. 8 is the surface of intensity distribution (propagation distance z=0, the polarization direction of polaroid is vertical direction) when verifying radial polarisation self-focusing Airy light beam among the utility model embodiment 1;
Fig. 9 is the surface of intensity distribution (propagation distance z=0, the polarization direction of polaroid is horizontal direction) when verifying radial polarisation self-focusing Airy light beam among the utility model embodiment 1;
Figure 10 is the surface of intensity distribution (propagation distance z=0, the polarization direction of polaroid is vertical direction) when verifying angle polarization self-focusing Airy light beam among the utility model embodiment 2;
Figure 11 is the surface of intensity distribution (propagation distance z=0, the polarization direction of polaroid is horizontal direction) when verifying angle polarization self-focusing Airy light beam among the utility model embodiment 2;
Among Fig. 1: 1, laser instrument; 2, polaroid; 3, spectroscope; 4, spatial light modulator; 5,9 and 11, computing machine; 6, convex lens; 7, annular diaphragm; 8, polarization converter; 10, beam analysis instrument.
Embodiment
Below in conjunction with drawings and Examples technical solutions of the utility model are further described.
Embodiment 1:
Referring to accompanying drawing 1, it be present embodiment provide a kind of radially with the structural representation of angle polarization self-focusing Airy beam generated device, this device comprises: laser instrument 1, polaroid 2, spectroscope 3, spatial light modulator 4, convex lens 6, annular diaphragm 7, polarization converter 8, beam analysis instrument 10, computing machine 5,9 and 11.
Send Gaussian beam by laser instrument 1, in the present embodiment, laser instrument 1 is the diode pumped solid state laser of adjustable power, and peak power 1.8W, wavelength are 532nm; Gaussian beam obtains the linear polarization Gaussian beam of polarization vertically through polaroid 2; The linear polarization Gaussian beam is divided into folded light beam and transmitted light beam by spectroscope 3, and transmissivity and the reflectivity of described spectroscope 3 are 50%, can improve the beam energy utilization factor; Transmitted light beam arrives spatial light modulator 4 in the mode of vertical incidence, spatial light modulator 4 is reflective spatial light modulator, its phase information loads phase information figure by computing machine 5 by software and modulates, referring to accompanying drawing 2, it is present embodiment being used for of providing light beam to be carried out the position phase information figure of modulation mutually, the linear polarization Gaussian beam the spatial light modulator LCDs carry out position modulate mutually after to reflect the mode outgoing; The light beam of modulating mutually through the position is divided into folded light beam and transmitted light beam by spectroscope 3 again, folded light beam is after Fourier transform convex lens 6 are assembled, focus place at convex lens 6 passes through annular diaphragm 7, obtain linear polarization self-focusing Airy light beam, in the present embodiment, the focal length of convex lens 6 is 400mm, is used for light beam is carried out Fourier transform and focusing; Referring to accompanying drawing 3, it is the structural representation of the annular diaphragm that provides of present embodiment, and the light transmission part of annular diaphragm 7 is annular, the diaphragm central circular is the lighttight part of blocking, ring radius is 1mm in it, outer shroud radius 2mm, and inside and outside aperture is for fixing non-adjustable; Linear polarization self-focusing Airy light beam obtains radially or angle polarization self-focusing Airy light beam after by polarization converter 8, in the present embodiment, polarization converter 8 is liquid crystal voltage modulation system polarization converter, by the computer control on-load voltage, regulate light polarization, realize radial polarisation or angle polarization.The device that present embodiment is provided produce radially or angle polarization self-focusing Airy light beam measure, can adopt beam analysis instrument 10 is linked to each other with computing machine 11, beam distribution instrument 10 be used for observation and take radially or angle polarization self-focusing Airy light beam in the light distribution at different propagation distance place.
Utilize said apparatus that present embodiment provides to produce radially method with angle polarization self-focusing Airy light beam, its concrete operations step is as follows:
1, sends Gaussian beam from laser instrument 1, during light beam process polaroid 2, regulate polaroid 2 polarization angles, make light beam become the linear polarization Gaussian beam of polarization in a certain direction.
Reflection and transmission take place when 2, the linear polarization Gaussian beam is through spectroscope 3, transmitted light beam arrives spatial light modulator 4 in the mode of vertical incidence, software program by computing machine 5 is loaded into phase information figure on the LCDs of spatial light modulator 4, regulate the position of the LCDs of spatial light modulator 4, transmitted light beam through spectroscope 3 just in time is radiated on the phase information figure, carries out the position and modulate the back mutually with the outgoing of reflection mode.
3, the LCDs of spatial light modulator 4 and annular diaphragm 7 place front focal plane and the back focal plane of convex lens 6 respectively, and convex lens 6 contrapositions are modulated the light beam that obtains mutually and carried out Fourier transform and convergence.Modulate the light beam that obtains mutually through the position and be divided into two bundles by spectroscope 3 again, folded light beam planoconvex lens 6 carries out passing through annular diaphragm 7 after the Fourier transform, obtains linear polarization self-focusing Airy light beam.Be phase information figure used in the present embodiment as shown in Figure 2, regulate the parameter of phase information figure, can change center spot radius and width and radius size of each ring on every side of the light beam of generation.
4, place polarization converter 8 near annular diaphragm 7, polarization converter 8 is carried out the adjusting of three-dimensional displacement and angle, and realize fine setting by computing machine 9 software change on-load voltages.Polarization converter 8 patterns are adjusted to radial polarisation, and linear polarization self-focusing Airy light beam produces radial polarisation self-focusing Airy light beam by polarization converter 8.
5, place beam analysis instrument 10 in radial polarisation self-focusing Airy propagation path, link to each other with computing machine 11, change beam analysis instrument 10 to the distance of polarization converter 8, observation and shooting radial polarisation self-focusing Airy light beam are in the light distribution at different propagation distance place.
Present embodiment is example to produce radial polarisation self-focusing Airy light beam, referring to accompanying drawing 4～7, they are respectively that radial polarisation self-focusing Airy light beam is respectively 0 at propagation distance z, the surface of intensity distribution at 0.25m, 0.85m, 1.50m place, wherein, accompanying drawing 6 is the focal length z=0.85m of self-focusing Airy light beam, and what obtain herein is that the light distribution at Airy beam focus place is hollow beam.The utility model for technical fields such as particle is caught, biomedical micro-nano operation provide a kind of generation with significant application value radially with angle polarization self-focusing Airy light beam.
The radial polarisation Airy light beam that produces is verified, its method is: place polaroid between polarization converter 8 and beam analysis instrument 10, the polarization direction of polaroid is adjusted to vertical direction, photographs the surface of intensity distribution as shown in Figure 8 at propagation distance z=0 place; The polarization direction of polaroid is adjusted to horizontal direction, photographs the surface of intensity distribution as shown in Figure 9 at propagation distance z=0 place.The surface of intensity distribution by accompanying drawing 8 and accompanying drawing 9 can prove that what present embodiment produced is radial polarisation self-focusing Airy light beam.
Embodiment 2:
The technical scheme of pressing embodiment 1 make up a kind of radially with angle polarization self-focusing Airy beam generated device, present embodiment is example to produce angle polarization self-focusing Airy light beam, and the angle polarization Airy light beam that produces is verified.Production method and verification method only are adjusted to the angle polarization with 8 patterns of polarization converter in the step 4 with embodiment 1, then produce angle polarization self-focusing Airy light beam.During checking, the polarization direction of polaroid is adjusted to vertical direction, photographs the surface of intensity distribution as shown in Figure 10 at propagation distance z=0 place; The polarization direction of polaroid is adjusted to horizontal direction, photographs the surface of intensity distribution as shown in Figure 11 at propagation distance z=0 place.The surface of intensity distribution by accompanying drawing 10 and accompanying drawing 11 can prove that what present embodiment produced is angle polarization self-focusing Airy light beam.
Claims (6)
- A generation radially or the device of angle polarization self-focusing Airy light beam, it is characterized in that: laser instrument sends the collimation Gaussian beam, through polaroid light beam is carried out the polarization state adjustment, obtains the linear polarization Gaussian beam of polarization in a certain direction; Described linear polarization Gaussian beam is by behind the spectroscope, and the transmitted light beam vertical incidence that produces to the spatial light modulator that has loaded phase information figure, is carried out position in the spatial light modulator LCDs and modulate mutually afterwards to reflect the mode outgoing; Again through spectroscope, after the folded light beam that produces assembled by the Fourier transform convex lens, through annular diaphragm, obtain linear polarization self-focusing Airy light beam; Described annular diaphragm is arranged on the focus place of convex lens; Place polarization converter behind annular diaphragm, the polarization state of polarization converter is adjusted into radially or the angle polarization, described linear polarization self-focusing Airy light beam obtains radially or angle polarization self-focusing Airy light beam after by polarization converter.
- A kind of generation according to claim 1 radially or the device of angle polarization self-focusing Airy light beam, it is characterized in that: described laser instrument is the diode pumped solid state laser of adjustable power.
- A kind of generation according to claim 1 radially or the device of angle polarization self-focusing Airy light beam, it is characterized in that: described spectroscopical transmissivity and reflectivity are 50%.
- A kind of generation according to claim 1 radially or the device of angle polarization self-focusing Airy light beam, it is characterized in that: described spatial light modulator is reflective spatial light modulator, by connected computing machine input phase information figure.
- 5. a kind of generation according to claim 1 radially or the device of angle polarization self-focusing Airy light beam, it is characterized in that: the light transmission part of described annular diaphragm is the annular region of diaphragm, the diaphragm central circular is shading light part, the inside and outside fixed apertures of diaphragm.
- 6. a kind of generation according to claim 1 radially or the device of angle polarization self-focusing Airy light beam, it is characterized in that: described polarization converter is liquid crystal voltage modulation system polarization converter, by the computer control on-load voltage, regulate the polarization state of light beam, realize radial polarisation or angle polarization.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320027094 CN203054353U (en) | 2013-01-18 | 2013-01-18 | Radial or angular polarized self-focusing Airy beam generation apparatus |
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| CN 201320027094 CN203054353U (en) | 2013-01-18 | 2013-01-18 | Radial or angular polarized self-focusing Airy beam generation apparatus |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018918A (en) * | 2013-01-18 | 2013-04-03 | 苏州大学 | Method and device for generating radial or angled polarization self-focusing Airy beam |
| CN104765153A (en) * | 2015-04-21 | 2015-07-08 | 浙江师范大学 | Similar Airy beam generation method and device |
| CN105514786A (en) * | 2016-01-22 | 2016-04-20 | 北京理工大学 | Method and system of generating vectorial beams in half-cavity with degrees adjustable |
| CN106324850A (en) * | 2016-11-02 | 2017-01-11 | 长春理工大学 | Method and device for producing vector vortex beam |
| CN110426831A (en) * | 2019-06-17 | 2019-11-08 | 华南师范大学 | A kind of focus illumination system and method |
| RU196430U1 (en) * | 2019-11-29 | 2020-02-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Сибирский государственный университет геосистем и технологий" (СГУГиТ) | Airy beam forming device in the terahertz wavelength range |
| CN114488546A (en) * | 2021-12-28 | 2022-05-13 | 中山大学 | Method for generating multifocal self-focusing light beam with adjustable focal point characteristic |
-
2013
- 2013-01-18 CN CN 201320027094 patent/CN203054353U/en not_active Withdrawn - After Issue
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018918A (en) * | 2013-01-18 | 2013-04-03 | 苏州大学 | Method and device for generating radial or angled polarization self-focusing Airy beam |
| CN103018918B (en) * | 2013-01-18 | 2014-11-05 | 苏州大学 | Method and device for generating radial or angled polarization self-focusing Airy beam |
| CN104765153A (en) * | 2015-04-21 | 2015-07-08 | 浙江师范大学 | Similar Airy beam generation method and device |
| CN104765153B (en) * | 2015-04-21 | 2017-08-25 | 浙江师范大学 | The production method and device of one species Airy beam |
| CN105514786A (en) * | 2016-01-22 | 2016-04-20 | 北京理工大学 | Method and system of generating vectorial beams in half-cavity with degrees adjustable |
| CN105514786B (en) * | 2016-01-22 | 2018-06-05 | 北京理工大学 | A kind of method and system of the adjustable half intracavitary generation vector beam of order |
| CN106324850A (en) * | 2016-11-02 | 2017-01-11 | 长春理工大学 | Method and device for producing vector vortex beam |
| CN106324850B (en) * | 2016-11-02 | 2017-12-12 | 长春理工大学 | A kind of method and apparatus for producing vector vortex beams |
| CN110426831A (en) * | 2019-06-17 | 2019-11-08 | 华南师范大学 | A kind of focus illumination system and method |
| CN110426831B (en) * | 2019-06-17 | 2021-08-03 | 华南师范大学 | Focusing illumination system and method |
| RU196430U1 (en) * | 2019-11-29 | 2020-02-28 | Федеральное государственное бюджетное образовательное учреждение высшего образования "Сибирский государственный университет геосистем и технологий" (СГУГиТ) | Airy beam forming device in the terahertz wavelength range |
| CN114488546A (en) * | 2021-12-28 | 2022-05-13 | 中山大学 | Method for generating multifocal self-focusing light beam with adjustable focal point characteristic |
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