CN103018918A - Method and device for generating radial or angled polarization self-focusing Airy beam - Google Patents
Method and device for generating radial or angled polarization self-focusing Airy beam Download PDFInfo
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Abstract
The invention relates to a method and a device for generating a radial or angled polarization self-focusing Airy beam. The method includes regulating polarization states of a collimating Gaussian beam to obtain a linear polarization Gaussian beam polarizing along a certain direction; performing light splitting to obtain a transmission beam, emitting the obtained transmission beam vertically to a spatial light modulator loaded with a phase information graph and then emitting the beam out in a reflecting manner after phase modulation; performing light splitting to obtain a reflected beam, subjecting the reflected beam to Fourier transformation and then converging the reflected beam by a convex lens so as to obtain a linear polarization self-focusing Airy beam through an annular stop at the focus point of the convex lens; and finally carrying out radial or angled polarization conversion to obtain the radial or angled polarization self-focusing Airy beam. By the method, self focusing can be carried out without any optical focusing elements, the light intensity in front of the focus point is low, the light intensity at the focus point is increased, energy is concentrated, and accurate positioning is achieved. The method can be applied to the fields of particle arrestance, biological medicines and the like, and belongs to the technical field of applied optics. In addition, the device is simple in structure and high in stability and is adjustable.
Description
Technical field
The present invention relates to a kind of generation radially or method and the device thereof of angle polarization self-focusing Airy light beam, the light beam that produces can be applicable to the 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 focusing optic and causes light beam to focus in the transmission course in free space or medium by himself transport property.Simultaneously, the Self-focusing 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 less 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 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 that has a 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 in the characteristic under the high NA focus and the important application on particle-capture, optical storage of data, material heat treatment, high-resolution imaging, electronics acceleration, electricity slurry focusing, Laser Processing and free space optical communication, has obtained extensive and deep research with it.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 have all the time on the axle light intensity be that the characteristics such as zero receive much concern, its local polarization state on any point on the beam cross-section (except the central point) is linear polarization, but the polarization direction is along radial direction; The local polarization state of angle light beam on any point on its beam cross-section also is linear polarization, 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 medium 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 creates in dichroism assembly etc.; Passive production method also has a lot, as utilizes optical fiber or utilize LCD space light modulator or polarization converter etc. in free space.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, for the technical fields such as particle-capture, biomedical micro-nano operation provide a kind of generation with significant application value radially with the method for angle polarization self-focusing Airy light beam, and provide a kind of simple in structure, be easy to adjust, the generation of good stability radially with the device of angle polarization self-focusing Airy light beam.
For achieving the above object, the technical solution used in the present invention provides a kind of generation radially or the method for angle polarization self-focusing Airy light beam, comprises the steps:
(1) the collimation Gaussian beam is carried out the polarization state adjustment, obtains the in a certain direction linear polarization Gaussian beam of polarization;
(2) after the described linear polarization Gaussian Beam light-splitting processing, with the transmitted light beam vertical incidence that obtains to the spatial light modulator that has loaded phase information figure, after modulate mutually the position with the outgoing of reflection mode;
(3) again through after the light-splitting processing with the folded light beam that obtains after the Fourier transform convex lens are assembled, by annular diaphragm, obtain linear polarization self-focusing Airy light beam at the focus place of convex lens;
(4) described linear polarization self-focusing Airy light beam is carried out radially or the angle polarization conversion is processed, obtain radially or angle polarization self-focusing Airy light beam.
Technical solution of the present invention also provides a kind of generation radially or the device of angle polarization self-focusing Airy light beam, and laser instrument sends Collimated Gaussian Beam, through polaroid light beam is carried out the polarization state adjustment, obtains the in a certain direction linear polarization Gaussian beam of polarization; Described linear polarization Gaussian beam is by behind the spectroscope, with the transmitted light beam vertical incidence that obtains to the spatial light modulator that has loaded phase information figure, after the enterprising line position of spatial light modulator LCDs is modulated mutually with the outgoing of reflection mode; Again through spectroscope, after the folded light beam that obtains 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 diode pumped solid state laser; Described spectroscopical transmissivity and reflectivity are 50%; Described spatial light modulator is reflective spatial light modulator, by connected computer 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, and the inside and outside aperture of diaphragm is fixed; 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 present invention compared with prior art has following advantages:
1, the Airy light beam generating method that provides of technical solution of the present invention does not need can carry out self-focusing by focusing optic, 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, technical solution of the present invention directly utilizes the linear polarization Gaussian beam to produce radially or angle polarization self-focusing Airy light beam, and method is simple, and is reliable.
3, the Airy beam generated device that provides is simple in structure, 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 embodiment of the invention;
Fig. 2 carries out the mutually phase information figure of modulation of position to light beam at the embodiment of the invention being used for of providing;
Fig. 3 is the structural representation of the annular diaphragm that provides of the embodiment of the invention;
Fig. 4 is the surface of intensity distribution (propagation distance z=0) of the radial polarisation self-focusing Airy light beam of generation in the embodiment of the invention 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 in the embodiment of the invention 1;
Accompanying drawing 6 is that the radial polarisation self-focusing Airy light beam of generation in the embodiment of the invention 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 in the embodiment of the invention 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 in the embodiment of the invention 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 in the embodiment of the invention 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 in the embodiment of the invention 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 in the embodiment of the invention 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, laser beam analyzer.
Embodiment
Below in conjunction with drawings and Examples technical solution of the present invention is 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, laser beam analyzer 10, computing machine 5,9 and 11.
Send Gaussian beam by laser instrument 1, in the present embodiment, laser instrument 1 is the adjustable diode pumped solid state laser of power, and peak power 1.8W, wavelength are 532nm; Gaussian Beam polaroid 2 obtains the vertically linear polarization Gaussian beam of polarization; The linear polarization Gaussian beam is divided into folded light beam and transmitted light beam by spectroscope 3, and transmissivity and the reflection 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 is modulated by Bootload phase information figure by computing machine 5, referring to accompanying drawing 2, it is present embodiment being used for of providing light beam to be carried out the mutually phase information figure of modulation of position, the linear polarization Gaussian beam after the enterprising line position of spatial light modulator LCDs is modulated mutually with the outgoing of reflection mode; 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.What the device that present embodiment is provided produced radially measures with angle polarization self-focusing Airy light beam, can adopt laser beam analyzer 10 is linked to each other with computing machine 11, beam distribution instrument 10 is used for observation and takes radially and the light distribution of angle polarization self-focusing Airy light beam at the 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 operation 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 in a certain direction linear polarization Gaussian beam of polarization.
Reflection and transmission occur when 2, the linear polarization Gaussian Beam is crossed 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 mutually rear with the outgoing of reflection mode.
3, the LCDs of spatial light modulator 4 and annular diaphragm 7 place respectively front focal plane and the back focal plane of convex lens 6, and convex lens 6 contrapositions are modulated mutually the light beam that obtains and carried out Fourier transform and convergence.Modulate mutually the light beam that obtains through the position and again be divided into two bundles by spectroscope 3, 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 as shown in Figure 2 phase information figure used in the present embodiment, regulate the parameter of phase information figure, can change center spot radius and on every side width and radius size of each ring 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, radially placing laser beam analyzer 10 with angle polarization self-focusing Airy propagation path, link to each other with computing machine 11, change laser beam analyzer 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 to produce radial polarisation self-focusing Airy light beam as example, 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 present invention for the technical fields such as particle-capture, 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 laser beam analyzer 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 to be producing angle polarization self-focusing Airy light beam as example, 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 (7)
1. a generation radially or the method for angle polarization self-focusing Airy light beam is characterized in that comprising the steps:
(1) the collimation Gaussian beam is carried out the polarization state adjustment, obtains the in a certain direction linear polarization Gaussian beam of polarization;
(2) after the described linear polarization Gaussian Beam light-splitting processing, with the transmitted light beam vertical incidence that obtains to the spatial light modulator that has loaded phase information figure, after modulate mutually the position with the outgoing of reflection mode;
(3) again through after the light-splitting processing with the folded light beam that obtains after the Fourier transform convex lens are assembled, by annular diaphragm, obtain linear polarization self-focusing Airy light beam at the focus place of convex lens;
(4) described linear polarization self-focusing Airy light beam is carried out radially or the angle polarization conversion is processed, obtain radially or angle polarization self-focusing Airy light beam.
A generation radially or the device of angle polarization self-focusing Airy light beam, it is characterized in that: laser instrument sends Collimated Gaussian Beam, through polaroid light beam is carried out the polarization state adjustment, obtains the in a certain direction linear polarization Gaussian beam of polarization; Described linear polarization Gaussian beam is by behind the spectroscope, with the transmitted light beam vertical incidence that obtains to the spatial light modulator that has loaded phase information figure, after the enterprising line position of spatial light modulator LCDs is modulated mutually with the outgoing of reflection mode; Again through spectroscope, after the folded light beam that obtains 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 2 radially or the device of angle polarization self-focusing Airy light beam, it is characterized in that: described laser instrument is diode pumped solid state laser.
A kind of generation according to claim 2 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 2 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 computer input phase information figure.
6. a kind of generation according to claim 2 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, and the inside and outside aperture of diaphragm is fixed.
7. a kind of generation according to claim 2 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 light polarization, realize radial polarisation or angle polarization.
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