CN100592137C - Generation device of random polarization distributing vector light beam - Google Patents
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Abstract
The invention provides a generation device of an arbitrary polarization distribution vector light beam, and is in turns provided with a spatial light modulator controlled by a computer, a first lens,a wave filter, two quarter wave plates, a second lens and a Rochi grating along the light direction of the light source producing linearly polarized light. The spatial light modulator is positioned ona front focal plane of the first lens, a back focal plane is provided with the wave filter, and the wave filter is synchronously positioned on a front focal plane of the second lens. Rochi grating ispositioned on a back focal plane of the second lens. Two quarter wave plates are placed by closely depending on the backlight source surface of the wave filter. The invention has the advantage of producing arbitrary vector light beam, and to be important, the device of the invention can produce the vector light beam in real time and dynamic manner. Moreover, the device greatly reduces the effectto the light beam quality caused by coherent noise, and can produce the high-quality vector light beam, and the producing manner is real time and dynamic.
Description
Technical field
The present invention relates to the generating apparatus of the random polarization distributing vector light beam of the generating apparatus of vector beam, particularly a kind of dynamic real-time.
Background technology
Light wave comprises the information of aspects such as frequency, position phase, intensity and polarization, and we carry out the normally polarized light of forms such as nonpolarized light or linear polarization, circular polarization, elliptic polarization of the employed light beam of scientific research.The polarization characteristic of these light beams is fairly simple, and its polarisation distribution is uniformly in perpendicular to the plane of direction of beam propagation, is called as even light beam, generally speaking, can use the model analysis of scalar light beam to describe its communication process.When handling the relevant issues of these light beams, we generally adopt the scalar theory, so this class light beam can be referred to as the scalar light beam again.For polarisation of light information is carried out better utilization, people have proposed the notion of vector beam.Different with the scalar light beam, vector beam is meant polarization complex shape or the dissemination class light beam to the direction of vibration sensitivity, and the processing of the relevant issues of this class light beam must be adopted vector theory.
1993, people such as the Darmstadt, Germany applied physics E.G.Churin of research institute have obtained the vector beam (E.G.Churin of two kinds of configurable polarization states, J.Ho feld, and T.Tschudi, " Polarizationconfigurations with singular point formed by computer generated holograms ", Opt.Commun 99,13-17 (1993)).They utilize beam splitter that a branch of linearly polarized light is divided into mutually perpendicular two bundles in polarization direction, utilize quarter wave plate that this two bunch polarized light is separately converted to the left-handed circularly polarized light and the circularly polarized light of dextrorotation then, two bundle circularly polarized light symmetries incide on the calculation holographic grating of making in advance, regulate grating make a branch of incident circularly polarized light+-1 order diffraction phase of wave of 1 order diffraction ripple and another bundle circularly polarized light does stack and just can produce vector beam.The shortcoming of this method is the vector beam that each computed hologram can only produce a kind of correspondence.The vector beam that produces different polarization states must re-design computed hologram and light path is regulated again, and its generative process is the mode of working offline.In the ensuing time, because the generation difficulty of vector beam is bigger, its advantage is not fully realized yet, and the research of vector beam aspect stays cool.Up to 2000, people such as optical research center K.S.Youngworth of U.S. University of Rochester and T.G.Brown publish an article on Opt.Express, calculated the character of two kinds of special vector beams under high-NA objective focuses in theory, obtained noticeable result (K.S.Youngworthand T.G.Brown, Opt.Express 7,77 (2000)).Wherein a kind of special vector beam is that radial polarisation light can obtain strong non-propagation longitudinal field component after by the lens focus of high-NA, thereby form sharp-pointed focus, and another kind of special vector beam be the rotation direction polarized light can be by focus on obtaining the hollow light field.These notional results have caused the extensive attention of optics circle, and the optics worker also begins to drop into great effort research vector beam, especially its production method.People such as Israel scientist Z.Bomzon published an article on Opt.Lett. in 2002, utilize the sub-wavelength dielectric grid with spatial variations of ad hoc structure, radial polarized light beam and two kinds of special vector beams of rotation direction light beam (Z.Bomzon et al have been obtained in 10.6 micron wave strong points, Optics Letters, 27,285 (2002)).People such as the M.Neil of univ cambridge uk utilized Wollaston prism and the ferroelectric spatial light modulator of binary etc. to design an optical system in 2002, not only obtained radial polarized light beam and rotation direction light beam but also obtained polarization state between (the M.A.A.Neil et al of a series of vector beams between the two, Optics Letters, 27,1929 (2002)).The people such as K.Toussaint of Univ Chicago USA in 2005 utilize the optical system of mainly being made up of two diffraction optical elements of particular design, generated vector beam (K.C.Toussaint et al like the operation class with M.Neil, Optics Letters, 30,2846 (2005)).The people such as Sato of northeastern Japan university in 2005 utilize conical Brewster design laserresonator to generate radial polarized light beam.And, utilize C-cutting Nd:YVO again then in 2006
4The birefringence of crystal has designed special laserresonator and has generated radial polarized light beam (Y.Kozawa and S.Sato, Optics Letters, 30,3063 (2005); K.Yonezawa, Y.Kozawa, and S.Sato, Optics Letters, 31,2151 (2006)).In March, 2007, the people such as C.Maurer of Innsbruck ,Austria medical university publish an article at New Jour.Phys., utilize Wollaston prism and reflective spatial light modulator etc. to form optical system, generated special vector beam (the C.Maurer et al of the such class of Laguerre-Gaussian beam, New J.Phys.9,78 (2007)).
In research in sum, the vector beam kind that generates is limited, be generally a certain class, Laguerre-Gaussian beam for example, and when needs generate different types of vector beam, must make bigger adjustment to light path, these restrictions have increased the technical difficulty of generation vector beam and the complicacy on the experimental implementation, are unfavorable for that vector beam obtains to use widely.And vector beam has the important use demand in fields such as biology, medical science, high-energy physics, material science, precision measurements.
Summary of the invention
Goal of the invention:, the invention provides a kind of generating apparatus that can in same light path, obtain the random polarization distributing vector light beam of the vector beam output that random polarization state distributes and a plurality of polarization mode coexists in order to overcome prior art can not generate multiple random polarization distributing vector light beam simultaneously in same light path deficiency.
Technical scheme: the invention provides a kind of generating apparatus of random polarization distributing vector light beam, along setting gradually by computer-controlled spatial light modulator, first lens, two mesh filter, two quarter-wave plates, second lens and Ronchi gratings (being the Rochi grating) on the radiation direction of the light source that produces polarized light; Spatial light modulator is positioned at the front focal plane of first lens, and the back focal plane of first lens is provided with two mesh filter; Two mesh filter is positioned at the front focal plane of second lens simultaneously; The Rochi grating is positioned at the back focal plane of second lens.Two quarter-wave plates are close to the two mesh filter backlight and are simultaneously placed, and the optical axis of described two quarter-wave plates is respectively in x and y direction.
The computed hologram that computing machine is generated is loaded into formation calculation holographic grating on the described spatial light modulator, thus the phasic difference between real-time regulated ± 1 order diffraction light wave, thus the polarization state of the vector beam of control output distributes.
The light source of described generation polarized light is made up of the laser instrument and first linear polarizer, and first linear polarizer can be so that the linear polarization of laser instrument outgoing beam be purer.
Be provided with rotation frosted glass between the laser instrument and first linear polarizer, its role is to destroy the spatial coherence of light, suppress relevant speckle noise, make the light beam of generation more even.
In order to make generation vector beam efficient higher, described Ronchi grating adopts the phase-type Ronchi grating.
Beneficial effect: the present invention has the advantage that can generate any vector beam, the more important thing is that device of the present invention can also generate vector beam real-time dynamicly.And this device greatly reduces the influence of coherent noise to beam quality, can generate high-quality vector beam.This generating apparatus can be regulated and control polarized state of light, helps to excavate and expand the polarization information of photon, thereby for more fully to utilize the information of photon to open up new approach.Also opened up more wide application prospect in fields such as biology, medical science, high-energy physics, material science, precision measurements for vector beam.
Description of drawings
Fig. 1 is a structural design synoptic diagram of the present invention.
Fig. 2 is an embodiment figure of apparatus of the present invention.
Fig. 3 is the generation that utilizes the m=1 single mode vector beam of apparatus of the present invention realization.
Fig. 4 is the generation that utilizes the m=1 bimodulus vector beam of apparatus of the present invention realization.
Fig. 5 is that the m that utilizes apparatus of the present invention to realize is the generation of the single mode vector beam of integer.
Fig. 6 is that the m that utilizes apparatus of the present invention to realize is the generation of the bimodulus vector beam of integer.
Fig. 7 is that the m that utilizes apparatus of the present invention to realize is the generation of half integral vector beam.
Fig. 8 is the generation of the vector beam that distributes of the multiple different polarization states of utilizing apparatus of the present invention to realize.
Embodiment
Below in conjunction with accompanying drawing the present invention is done further explanation.
As shown in Figure 1, the core of the generating apparatus of random polarization distributing vector light beam of the present invention is, sets gradually by computer-controlled spatial light modulator 2, first lens 3, wave filter 4, two quarter-wave plates 5, second lens 6 and phase-type Ronchi gratings 7 along the radiation direction of the light source 1 that produces polarized light; Spatial light modulator 2 is positioned at the front focal plane of first lens 3, and the back focal plane of first lens 3 is provided with wave filter 4; Wave filter 4 is positioned at the front focal plane of second lens 6 simultaneously; Phase-type Ronchi grating 7 is positioned at the back focal plane of second lens 6; Two quarter-wave plates 5 are close to wave filter 4 backlights and are simultaneously placed.As shown in Figure 2, the complete optimal technical scheme of the generating apparatus of random polarization distributing vector light beam of the present invention is as follows: the laser instrument that we use is that the wavelength of Coherent company is the green (light) laser 8 of 532 nanometers, spatial light modulator is the transmission-type spatial light modulator 2 of Sony company, resolution is 1024x768, and the size of each pixel is 14 microns * 14 microns.We are provided with a 4f optical system and realize, this 4f system comprises that the focal length of two confocal placements is all 400 millimeters lens L1 and L2, be placed on the spatial light modulator 2 on the L1 front focal plane, two mesh filter 4 on the L1 back focal plane is close to λ/4 wave plates 5 in each hole and the phase-type Rochi grating 7 of lens L2 back focal plane.Also be provided with linear polarizer 9 being used for determining the incident ray polarized light polarization direction and a rotation frosted glass 10 of broken beam spatial coherence before the spatial light modulator 2, and be three set lens of laser beam expanding as the set position of Fig. 2.Also be provided with behind the Rochi grating 7 and be used to check a linear polarizer 11 of vector beam and the charge-coupled image sensor 12 of surveying vector beam.The computed hologram that designs is loaded into the required holographic grating of generation on the LCD space light modulator 2, can provides given reference phase difference for the different diffraction lighting level is inferior, this is based on the key that the light wave stacking method generates vector beam.A branch of linearly polarized light incides on the spatial light modulator 2, is divided into the multi-level diffraction light ripple through behind the holographic grating, and wherein ± 1 the position of order diffraction light wave is always opposite mutually.± 1 order diffraction light is extracted by two mesh filter 4 on the L1 back focal plane, converted to left circularly polarized light and right-circularly polarized light respectively through λ/4 wave plates 5, Rochi grating 7 through the L2 back focal plane makes two of left-handed and dextrorotation restraint circularly polarized lights conllinear stack again again, just can obtain required vector beam.The polarization state of vector beam distributes, and can detect by analyzer 11 and charge-coupled image sensor 12 and determine.
The principle of light wave beam splitting and stack is as follows: a branch of direction of vibration and x axle linearly polarized light in angle of 45 degrees incide on the spatial light modulator, spatial light modulator loaded transmitance be t (x, y)=[1+ γ cos (2 π f
0X+ δ)] calculation holographic grating/2, wherein γ and f
0Be respectively the degree of modulation and the spatial frequency of grating, δ is the phase shift of grating fringe.Grating ± 1 order diffraction light through two optical axises respectively the amplitude behind the quarter-wave plate of x and y direction can be expressed as with the vector expression of x and y oscillating component
A wherein
0It is an arbitrary constant factor.Carry out the conllinear stack through the Rochi grating diffration again, radial vibration component and rotation direction oscillating component under the available polar coordinates of output light that obtain are expressed as
Wherein ρ and
Be respectively radial coordinate and azimuthal coordinate.Obviously, the phase shift delta of control holographic grating can obtain the vector beam that different polarization distributes.For example
The time, wherein m is an integer,
Be constant, then can generate the vector beam of polarisation distribution with respect to the beam center symmetry, promptly post symmetry vector beam when m is non-integer, then is a kind of non-post symmetry vector beam.
The 4f system of our design utilizes the selfdecomposition of same light beam and synthesizes certainly to generate vector beam, and principle is simple, and experimental system realizes easy and simple to handle easily.This system allows the incident light of low degree of coherence, can reduce the influence of coherent noise to beam quality greatly.The hologram that computing machine produces is loaded into and forms holographic grating on the spatial light modulator, can generate different holographic gratings by changing computed hologram, for ± 1 order diffraction light provides specific phase differential, thereby produce required vector beam, can generate the vector beam that random polarization distributes on the principle.Overcome prior art limited limitation of kind when generating vector beam.Generating different vector beams does not need light path is made any change, only needs to change the computed hologram of projection, eliminates other technology must be adjusted light path when generating different vector beam shortcoming, for the application of vector beam provides convenience.
Build the 4f optical system according to Fig. 1 principle, the concrete experimental system of Gou Jianing as shown in Figure 2 according to this.Computed hologram shown in the 2nd hurdle (CGH) among Fig. 3 is projected on the spatial light modulator, just can the CCD place in Fig. 2 obtain with Fig. 3 in the corresponding post symmetry vector beam of polarisation distribution shown in first hurdle.The beam intensity of not inserting linear polarizer 2 before the CCD and inserting linear polarizer 2 is shown in the 3rd hurdle among Fig. 3 and the 4th hurdle, and the dim spot of beam center is caused by polarization state probabilistic singular point that distributes.When having inserted the linear polarizer 2 of analyzing effect before the CCD, in the beam intensity direction of extinction can appear, direction of extinction correspondence
The direction of extinction at vertical direction is in four experimental results
Corresponding situation is the light beam of radial polarisation, and the direction of extinction is in the horizontal direction
Distribution corresponding to the light beam of rotation direction polarization, the direction of extinction is at the vector beams of 45 degree and the symmetrical polarisation distribution of the corresponding two kinds of posts of 135 degree directions.This figure shows, utilizes our 4f system to realize the generation of m=1 single mode vector beam.Symbol implication among Fig. 3: the phase shift of holographic grating is taken as the vortex position and distributes mutually
The time vector beam, wherein
Be constant, the output beam field strength distribution is
A0 is a constant.First hurdle is Polarization among Fig. 3, and the polarization state that provides vector beam distributes; Second hurdle is CGH, Computer Generated Hologram, and computed hologram is projected in and generates holographic grating on the spatial light modulator; Third column is the vector beam intensity distribution when not adding analyzer (Analyzer); The 4th hurdle is the vector beam intensity distribution that adds behind the analyzer, is used to check the polarization state of vector beam; Second classifies as
Generate a kind of radial polarized light beam; The 3rd classifies as
Generate a kind of polarization state between radially and the vector beam between the rotation direction; The 4th classifies as
Generate a kind of rotation direction light beam; The 5th classifies as
Generate a kind of polarization state between rotation direction with the vector beam radially.
Build the 4f optical system according to Fig. 1 principle, the concrete experimental system of Gou Jianing as shown in Figure 2 according to this.Computed hologram shown in the 2nd hurdle among Fig. 4 is projected on the spatial light modulator, just can in Fig. 2, obtains and the corresponding vector beam of polarisation distribution shown in Fig. 4 first hurdle at the CCD place.The difference of inside and outside intermode polarization state has caused in the field strength distribution, and in the appearance of place, separatrix blanking bar, and blanking bar becomes clear gradually along with the enhancing of the difference of inside and outside intermode polarization state, and it is the most clear to reach blanking bar when the polarization state of inside and outside intermode is reverse.Similar with example 1, there is the center singular point equally and adds the situation that occurs the direction of extinction behind the linear polarizer.Utilize our 4f system to realize the generation of m=1 bimodulus vector beam at this.Symbol implication among Fig. 4: provided the experimental result of the inside and outside bimodulus light beam of two kinds of polarization mode coexistences of a class, internal mold is meant and is distributed in radius r=0 to r=r
0A kind of polarisation distribution pattern between/2, internal mold all is a radial polarisation in Fig. 4, its polarization state can be expressed as
External mold is meant and is distributed in radius r=r
0/ 2 to r=r
0Between the polarisation distribution pattern, the external mold among Fig. 4 is that polarization state can be expressed as
Polarisation distribution, A wherein
0It is constant.First hurdle among Fig. 4-Polarization, the polarization state that provides vector beam distributes; Second hurdle-CGH, Computer Generated Hologram, computed hologram is projected in and generates holographic grating on the spatial light modulator; The vector beam intensity distribution of third column-when not adding polaroid; Vector beam intensity distribution behind the 4th hurdle-Jia upper polarizer is used to check the polarization state of vector beam; Secondary series---generate a kind of internal mold and be radial polarisation and external mold corresponding to
The bimodulus vector beam; The 3rd row---generate the bimodulus vector beam of a kind of internal mold radial polarisation and external mold rotation direction polarization; A kind of internal mold radial polarisation of the 4th row-generation and external mold corresponding to
The bimodulus vector beam; External mold was radial polarisation in the 5th row-generation was a kind of, but the reverse bimodulus vector beam of polarization state.
Build the 4f optical system according to Fig. 1 principle, the concrete experimental system of Gou Jianing as shown in Figure 2 according to this.With among Fig. 5 shown in the 2nd hurdle computed hologram be projected on the spatial light modulator, just can be in Fig. 2 the CCD place obtain the post symmetry vector beam corresponding with polarisation distribution shown in Fig. 5 first hurdle.Similar with example 1, there is the center singular point equally.But the situation that adds the situation that occurs the direction of extinction behind the linear polarizer is different with example 1, and the direction of extinction can be expressed as k π/m+ pi/2 m, integer k=0～m-1 wherein, and the number of the direction of extinction equates with topological number m.For example in the vector beam of m=2, add linear polarizer after, two direction of extinction π/4 and 3 π/4 appear, consistent with theory.Utilize our 4f system to realize that m is the generation of the single mode vector beam of integer at this.Symbol implication among Fig. 5: the phase shift of holographic grating is taken as the vortex position and distributes mutually
The time the vector beam experimental result, wherein m is the topological charge of integer representation vortex, output field intensity be distributed as
A wherein
0Be constant,
Be the position angle, integer m corresponding among the figure is respectively 2,3,5.First hurdle among Fig. 5-Polarization, the polarization state that provides vector beam distributes; Second hurdle-CGH, Computer 6enerated Hologram, computed hologram is projected in and generates holographic grating on the spatial light modulator; Third column is the vector beam intensity distribution when not adding analyzer (Analyzer); The 4th hurdle is the vector beam intensity distribution that adds behind the analyzer, is used to check the polarization state of vector beam; Secondary series-m=2 generates the single mode vector beam of a kind of topological number m=2; The 3rd row-m=3 generates the single mode vector beam of a kind of topological number m=3; The 4th row-m=5 generates the single mode vector beam of a kind of topological number m=5.
Build the 4f optical system according to Fig. 1 principle, the concrete experimental system of Gou Jianing as shown in Figure 2 according to this.Computed hologram shown in the 2nd hurdle among Fig. 6 is projected on the spatial light modulator, just can in Fig. 2, obtains the post symmetry vector beam corresponding in the CCD place with polarisation distribution shown in Fig. 6 first hurdle.Similar with example 2 bimodulus situations, endless belt appears in the place, separatrix.With example 2 differences is to present bright dark variation tendency in same endless belt, dim spot delustring, and its position appears at (2k-1) π/(m-1), k=0～m-1.Consistent with theory.Utilize our 4f system to realize that m is the generation of the bimodulus vector beam of integer at this.Symbol implication among Fig. 6: similar Fig. 4, provided the class internal mold field intensity bimodulus vector beam field strength distribution different with the external mold field intensity, internal mold is meant and is distributed in radius r=0 to r=r
0A kind of polarisation distribution pattern between/2, internal mold all is a radial polarisation in Fig. 6, its polarization state can be expressed as
External mold is meant and is distributed in radius r=r
0/ 2 to r=r
0Between the polarisation distribution pattern, the external mold among Fig. 6 is that polarization state can be expressed as
Polarisation distribution, A wherein
0Be constant,
Be the position angle, topological charge m gets 2,4,7 respectively.First hurdle among Fig. 6-Polarization, the polarization state that provides vector beam distributes; Second hurdle-CGH, Computer Generated Hologram, computed hologram is projected in and generates holographic grating on the spatial light modulator; Third column is the vector beam intensity distribution when not adding analyzer (Analyzer); The 4th hurdle is the vector beam intensity distribution that adds behind the analyzer, is used to check the polarization state of vector beam; What secondary series-m=2 represented to generate is the bimodulus vector beam of a kind of internal mold radial polarisation and external mold m=2; What the 3rd row-m=4 represented to generate is the bimodulus vector beam of a kind of internal mold radial polarisation and external mold m=4; What the 4th row-m=7 represented to generate is the bimodulus vector beam of a kind of internal mold radial polarisation and external mold m=7.
Build the 4f optical system according to Fig. 1 principle, the concrete experimental system of Gou Jianing as shown in Figure 2 according to this.Computed hologram computed hologram shown in the 2nd hurdle among Fig. 7 is projected on the spatial light modulator, just can in Fig. 2, obtains the vector beam that the non-post shown in corresponding diagram 6 first hurdles is symmetrically distributed in the CCD place.Similar with example 1, there is the center singular point equally.Exist the place different to be, also occur a horizontal concealed wire here with example 1, this concealed wire since about polarization state suddenly change and cause.The direction of extinction can occur equally after adding polarizer 2, different with the situation of example 1, the direction of extinction here is divided into 2m lobe to the surface of intensity distribution, and laterally concealed wire exists all the time.These results are with theoretical consistent.Utilize our 4f system to realize that m is the generation of half integral vector beam at this.Symbol implication among Fig. 7: having provided field strength distribution is
The vector beam experimental result, A wherein
0Be constant,
Be the position angle, topological charge m gets half-integer 0.5 and 1.5 respectively.First hurdle among Fig. 7-Polarization, the polarization state that provides vector beam distributes; Second hurdle-CGH, Computer Generated Hologram, computed hologram is projected in and generates holographic grating on the spatial light modulator; Third column is the vector beam intensity distribution when not adding analyzer (Analyzer); The 4th hurdle is the vector beam intensity distribution that adds behind the analyzer, is used to check the polarization state of vector beam; The 5th hurdle-add the vector beam intensity distribution of vertical direction polaroid is used to check the polarization state of vector beam; Secondary series-m=0.5, the vector beam that to generate a kind of topological number be half-integer m=0.5; The 3rd row-m=1.5, the vector beam that to generate a kind of topological number be half-integer m=1.5.
Build the 4f optical system according to Fig. 1 principle, the concrete experimental system of Gou Jianing as shown in Figure 2 according to this.We are previous examples 1,3 in this example, and the situation in 5 realizes in same beam vector light beam, that is has different polarization modes in zones of different in the vector beam of this example.The polarisation distribution of this light beam is specially: in upper left 1/4th zones are radial polarisation optical modes, upper right 1/4th zones are rotation direction polarized light patterns, / 4th zones, lower-left are the polarization mode of m=3, and 1/4th zones, bottom right are the polarization mode of m=1.5.Place, separatrix between the different polarization pattern bright dark variation occurs according to the size of polarization state difference.Utilize our 4f system to realize comprising in the same light beam generation of the vector beam that multiple different polarization states distributes at this.Symbol implication among Fig. 8: provided in the same light beam result that four different arrow patterns coexist as zones of different, four patterns correspond respectively to: radial polarisation (RP):
Rotation direction polarization (AP):
Topological charge m=3:
Topological charge m=1.5:
A wherein
0Being constant, is the position angle.First hurdle among Fig. 8-when not adding analyzer (Analyzer) in the same light beam zones of different comprise the vector beam intensity distribution of different polarization states; Vector beam intensity distribution behind second hurdle-the add horizontal direction analyzer is used to check the polarization state of vector beam; The vector beam of a kind of zones of different various modes of secondary series-generation vector light coexistence.
Claims (4)
1, a kind of generating apparatus of random polarization distributing vector light beam, it is characterized in that the radiation direction that the edge produces the light source (1) of linearly polarized light sets gradually by computer-controlled spatial light modulator (2), first lens (3), two mesh filter (4), two quarter-wave plates (5), second lens (6) and Ronchi grating (7); Spatial light modulator (2) is positioned at the front focal plane of first lens (3), and the back focal plane of first lens (3) is provided with two mesh filter (4); Two mesh filter (4) is positioned at the front focal plane of second lens (6) simultaneously; Ronchi grating (7) is positioned at the back focal plane of second lens (6); Two quarter-wave plates (5) are close to two mesh filter (4) backlight and are simultaneously placed, and the optical axis of described two quarter-wave plates is respectively at x axle and y direction of principal axis; Described spatial light modulator (2) is loaded into the spatial light modulator (2) that the back forms the calculation holographic grating for the computed hologram that is generated by computing machine; Wherein light source (1) is for producing a branch of direction of vibration and the x axle light source that incides the linearly polarized light on the spatial light modulator in angle of 45 degrees; Described spatial light modulator (2) for loaded transmitance be t (x, y)=[1+ γ cos (2 π f
0The spatial light modulator of calculation holographic grating x+ δ)]/2, wherein γ and f
0Be respectively the degree of modulation and the spatial frequency of grating, δ is the phase shift of grating fringe; Described two mesh filter (4) is for being used for extracting the two mesh filter (4) of ± 1 order diffraction light.
2, the generating apparatus of random polarization distributing vector light beam according to claim 1 is characterized in that, the light source of described generation polarized light (1) is made up of laser instrument (8) and first linear polarizer (9).
3, the generating apparatus of random polarization distributing vector light beam according to claim 1 is characterized in that, is provided with rotation frosted glass (10) between laser instrument (8) and first linear polarizer (9).
4, the generating apparatus of random polarization distributing vector light beam according to claim 1 is characterized in that, above-mentioned Ronchi grating (7) adopts the phase-type Ronchi grating.
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