CN105182547B - A kind of method and device that vector beam is produced based on birefringent polarizing beam splitter - Google Patents

Abstract

A method and device for generating a vector beam based on a birefringent polarization beam splitter, the device is to arrange a calculation hologram on the front focal plane of the first Fourier lens, and the birefringence polarization beam splitter is arranged on the first Fourier lens Between the front focal plane of the leaf lens and the first Fourier lens, the filter aperture is arranged on the back focal plane of the first Fourier lens, and the second Fourier lens is placed between the filter aperture and the output surface; The method is to illuminate the computational hologram with a plane beam or Gaussian beam, the beam passing through the computational hologram is transformed by a birefringent polarizing beam splitter and the first Fourier lens, and then filtered by a filter aperture, and the beam passing through the filter aperture is then passed through A second Fourier lens to obtain the desired vector beam at the output facet. The present invention does not need to insert any other elements between the computational hologram and the birefringent polarization beam splitter, so that the extinction ratio of the two orthogonal polarization components of the generated vector beam is better than ^10-5 , and high-quality vector beams can be obtained. beam.

Description

A method and device for generating vector beams based on a birefringent polarization beam splitter

technical field

The invention relates to a method and a device for generating a vector beam based on a birefringent polarization beam splitter, and belongs to the technical field of vector beams.

Background technique

In recent years, more and more studies have begun to involve vector beams with non-uniform distribution of polarization states, because it has been found that such vector beams have some special properties that scalar light fields with uniform polarization do not have (see references 1-4). The special properties of vector beams have been used in super-resolution focused imaging (see literature 5 and 6), surface plasmon excitation (see literature 7 and 8), optical micromanipulation (see literature 9-12), laser micromachining (see literature 13 and 14) and other fields have shown its important practical application value.

Since most commercial lasers can only output simple modes, how to transform them into vector beams with both specific polarization distribution and specific complex amplitude distribution has become a difficult problem in many practical applications. A lot of work has been done and many approaches have been proposed to solve this problem. These approaches can be roughly divided into static switching techniques based on conventional optical elements (see literature 15-17) and dynamic switching techniques based on programmable spatial light modulators (see literature 18-33). The latter is more interesting and widely used due to its advantage of being dynamically programmable. Generating arbitrary vector beams usually requires simultaneous manipulation of the complex amplitude distributions of two orthogonal polarization states. Literature 5 and Literature 18-21 use two independent SLMs to achieve this purpose; while the systems used in Literature 22-31 consist of one SLM and an optical system that can realize dual-channel polarization separation and recombination.

Recently, literature 32 and literature 33 proposed two arbitrary vector beam generation methods and devices based on Wollaston prisms, but the method in literature 33 can only be used to generate some special vector beams, such as polarization vortices; while the literature 32 The method needs to insert a non-polarizing beam splitter in the optical path, so that the energy utilization rate is greatly reduced.

To sum up, how to efficiently generate arbitrary vector beams with simple methods and devices is still an urgent problem to be solved in this technical field.

The documents mentioned above are:

Literature 1. Q.Zhan, "Cylindrical vector beams: from mathematical concepts to applications," Adv.Opt.Photon.1,1-57(2009).

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Document 3. H.Wang, L.Shi, B.Lukyanchuk, C.Sheppard, and C.T.Chong, "Creation of a needle of longitudinally polarized light in vacuum using binary optics," Nat. Photonics 2(8), 501-505( 2008).

Literature 4. X.L.Wang, J.Chen, Y.Li, J.Ding, C.S.Guo, and H.T.Wang, "Optical orbital angular momentum from the curl of polarization," Phys.Rev.Lett.105(25), 253602(2010 ).

Document 5. F.Kenny, D.Lara, O.G.Rodríguez-Herrera, and C.Dainty, "Complete polarization and phase control for focus shaping in high-NA microscopy," Opt. Express 20(13), 14015-14029(2012) .

Document 6. W.Chen and Q.Zhan, "Diffraction limited focusing with controllable arbitrary three-dimensional polarization," J.Opt.12(4), 045707(2010).

Literature 7. Q.Zhan, "Evanescent Bessel beam generation via surface plasmonresonance excitation by a radially polarized beam," Opt.Lett.31(11), 1726-1728(2006).

Literature 8. K.J.Moh, X.-C.Yuan, J.Bu, S.W.Zhu, and B.Z.Gao,"Radialpolarization induced surface plasmon virtual probe for two-photonfluorescence microscopy,"Opt.Lett.34(7), 971-973 (2009).

Literature 9. T.A.Nieminen, N.R.Heckenberg, and H.Rubinsztein-Dunlop, "Forcesin optical tweezers with radially and azimuthally polarized trapping beams," Opt. Lett.33(2), 122-124(2008).

Document 10. Y.Kozawa and S.Sato,"Optical trapping of micrometer-sized dielectric particles by cylindrical vector beams,"Opt.Express 18(10), 10828-10833(2010).

Document 11. D.B.Ruffner and D.G.Grier, "Optical Forces and Torques in Nonuniform Beams of Light," Phys.Rev.Lett.108(17), 173602(2012).

Literature 12. M.I.Marqués, "Beam configuration proposal to verify that scattering forces come from the orbital part of the Poynting vector," Opt. Lett.39(17), 5122-5125(2014).

Literature 13. M.Meier, V.Romano, and T.Feurer, "Material processing with pulsed radially and azimuthally polarized laser radiation," Appl. Phys., A Mater. Sci. Process. 86(3), 329-334 (2007) .

Literature 14. K.Lou, S.X.Qian, Z.C.Ren, C.Tu, Y.Li, and H.T.Wang, "Femtosecond Laser Processing by Using Patterned Vector Optical Fields," Sci.Rep.3, 2281(2013).

Literature 15. K.C.Toussaint Jr, S.Park, J.E.Jureller, and N.F.Scherer, "Generation of optical vector beams with a diffractive optical element interferometer," Opt. Lett.30(21), 2846-2848(2005).

Literature 16. G.Machavariani, Y.Lumer, I.Moshe, A.Meir, and S.Jackel, "Efficient xracavity generation of radially and azimuthally polarized beams," Opt. Lett.32(11), 1468-1470(2007) .

Literature 17. M. Beresna, M. Gecevicius, P.G. Kazansky, and T. Gertus, "Radially polarized optical vortex converter created by femtosecond lasernanostructuring of glass," Appl. Phys. Lett.98, 201101 (2011).

Literature 18. R.L.Eriksen, P.C.Mogensen, and J.Glückstad, "Ellipticalpolarization encoding in two dimensions using phase-only spatial lightmodulators," Opt.Commun.187, 325-336(2001).

Literature 19. D.Maluenda, I.Juvells, R.Rodríguez-Herrera, and A.Carnicer,"Reconfigurable beams with arbitrary polarization and shape distributions at given plane,"Opt.Express 21(5), 5424-5431(2013)

Literature 20. W.Han, Y.Yang, W.Cheng, and Q.Zhan, "Vectorial optical fieldgenerator for the creation of arbitrarily complex fields," Opt.Express 21(18), 20692-20706(2013).

Literature 21. Z.Y.Rong, Y.J.Han, S.Z.Wang, and C.S.Guo, "Generation of arbitrary vector beams with cascaded liquid crystal spatial lightmodulators," Opt. Express 22(2), 1636(2014).

Literature 22. X.L.Wang, J.Ding, W.J.Ni, C.S.Guo, and H.T.Wang,"Generation of arbitrary vector beams with a spatial light modulator and a common pathinterferometric arrangement,"Opt.Lett.32(24),3549-3551( 2007).

Literature 23. X.L.Wang, Y.Li, J.Chen, C.S.Guo, J.Ding, and H.T.Wang, "A new type of vector fields with hybrid states of polarization," Opt.Express 18(10), 10786-10795( 2010).

Literature 24. H.Chen, J.Hao, B.F.Zhang, J.Xu, J.Ding, and H.T.Wang, "Generation of vector beam with space-variant distribution of both polarization and phase," Opt.Lett.36, 3179 (2011 ).

Literature 25. I.Moreno, C.Iemmi, J.Campos, and M.J.Yzuel, “Jones matrix treatment for optical Fourier processors with structured polarization,” Opt.Express 19, 4583(2011).

Literature 26. S. Liu, P. Li, T. Peng, and J. Zhao, "Generation of arbitrary spatially variant polarization beams with a trapezoid sagnac interferometer," Opt. Express 20(19), 21715-21721(2012).

Literature 27. I.Moreno, J.A.Davis, T.M.Hernandez, D.M.Cottrell, and D.Sand,"Complete polarization control of light from a liquid crystal spatial lightmodulator,"Opt.Express 20(1), 364-376(2012).

Document 28. J.H.Clegg and M.A.A.Neil, "Double pass, common path method for arbitrary polarization control using a ferroelectric liquid crystal spatiallight modulator," Opt. Lett.38(7), 1043-1045(2013)

Literature 29. C.S.Guo, Z.Y.Rong and S.Z.Wang, "Double-channel vector spatiallight modulator for generation of arbitrary complex vector beams," Opt. Lett.39(2), 386-389(2014).

Literature 30. Z.Chen, T.Zeng, B.Qian, and J.Ding, "Complete shaping of optical vector beams," Opt.Express 23(14), 17701-17710(2015).

Literature 31. S.Fu, C.Gao, Y.Shi, K.Dai, L.Zhong, and S.Zhang,"Generating polarization vortices by using helical beams and a Twyman Greeninterferometer,"Opt.Lett.40(8), 1775-1778(2015).

Literature 32. C.Maurer, A.Jesacher, S.Fürhapter, S.Bernet, and M.Ritsch-Marte, "Tailoring of arbitrary optical vector beams," New J.Phys.9, 78(2007).

Literature 33. J.Xin, C.Gao, C.Li, and Z.Wang, "Generation of polarization vortices with a Wollaston prism and an interferometric arrangement," Appl.Opt.51(29), 7094-7097(2012).

Contents of the invention

The purpose of the present invention is to solve the problems existing in the existing vector beam generation technology, to propose a method for generating vector beams based on a birefringent polarization beam splitter that is simple and capable of obtaining high-quality vector beams, and to provide a method for realizing the method s installation.

The method for generating a vector beam based on a birefringent polarization beam splitter of the present invention comprises the following steps:

(1) Preparation of computational holograms:

①Designing a computational hologram: First, decompose any vector beam to be generated into two orthogonal polarization components and obtain the amplitude and phase distributions of these two orthogonal polarization components respectively; then use the computational hologram encoding method (such as corrected separation Axial interferometric computational holographic encoding method) encodes the amplitude and phase distributions of these two orthogonal polarization components into two different diffraction directions respectively;

② Prepare the designed computational hologram;

The designed computational hologram can be prepared by conventional optical micromachining technology, or it can be realized by directly outputting the designed computational hologram through a computer interface through a spatial light modulator.

(2) Place the prepared computational hologram on the front focal plane of the first Fourier lens, and place a birefringent polarization beam splitter between the front focal plane of the first Fourier lens and the first Fourier lens , placing a filter aperture on the back focal plane of the first Fourier lens, and placing a second Fourier lens between the filter aperture and the output plane;

(3) Use a planar light beam or a Gaussian light beam to illuminate the computational hologram, and the light beam that passes through the computational hologram is transformed by the first Fourier lens, and then filtered by the filter aperture to obtain the required spatial frequency domain form of the vector light beam; The light beam of the filtered aperture passes through the second Fourier lens to obtain the required vector light beam at the output surface.

The coding in described step (1) is carried out by following formula:

in:

t(x,y) is the complex amplitude transmittance function of the calculated hologram;

a ₀ and a ₁ are constants greater than 0, and j is an imaginary number symbol;

u _x and u _y are the complex amplitudes of two orthogonal polarization components respectively (the * sign above them is conjugate).

x _α ＝d tan(α), is the misalignment of two mutually misaligned images generated at the output surface through the light field of the computational hologram, one of which is horizontal linearly polarized light and the other is vertical linearly polarized light , d is the distance between the birefringent polarization beam splitter and the computational hologram, 2α is the beam splitting angle of the birefringence polarization beam splitter;

k _α =2πsin(α)/λ, is the spatial frequency component of the light illuminating the computational hologram along the y direction, 2α is the beam splitting angle of the birefringent polarizing beam splitter, and λ is the wavelength of the illuminating light.

The device for generating a vector beam based on a birefringent polarization beam splitter to realize the above method adopts the following technical scheme:

The device includes a calculation hologram, a birefringent polarization beam splitter, two Fourier lenses, a filter aperture and an output surface, the calculation hologram is set on the front focal plane of the first Fourier lens, and the birefringence polarization beam splitter The filter is set between the front focal plane of the first Fourier lens and the first Fourier lens, the filter aperture is set on the back focal plane of the first Fourier lens, and the second filter aperture is placed between the filter aperture and the output surface. a Fourier lens.

Computational holograms can be fabricated by optical microfabrication processes or directly output to a spatial light modulator.

The birefringent polarizing beamsplitter can be a Wollaston prism or a Logger prism, or a simple birefringent micro-angle beamsplitter prism.

The radius R of the filter aperture is equal to or smaller than f sinα, where 2α is the beam splitting angle of the birefringent polarization beam splitter, and f is the focal length of the Fourier lens.

The invention is simple and easy to implement, since no other components need to be inserted between the computational hologram and the birefringent polarization beam splitter, so that the extinction ratio of the two orthogonal polarization components of the generated vector beam can be better than 10 ^-5 , high-quality vector beams can be obtained.

Description of drawings

Fig. 1(a) is a schematic diagram of the principle of the device of the present invention; Fig. 1(b) is a schematic diagram of the specific optical path and coordinate system of the device of the present invention.

Fig. 2 (a) is a schematic diagram of the light field distribution at the spatial spectrum plane P2 of the system realized by the present invention, and Fig. 2 (b) is a schematic diagram of the light field distribution at the spatial spectrum plane P2 after the BBS is removed in the system.

Figure 3(a) is the total intensity distribution diagram of the vector beam obtained at the output surface P3 of the system; Figure 3(b), Figure 3(c) and Figure 3(d) are respectively the 45-degree angles of the generated vector beam directional polarization component, horizontal (x direction) polarization component and vertical (y direction) polarization component; Figure 3(e) and Figure 3(f) are the two orthogonal polarization components (horizontal polarization and vertically polarized) and a plane polarized light interference pattern.

detailed description

The present invention is based on the birefringence polarizing beam splitter to produce the device of vector beam that does not need complicated optical path, and the required optical element is also very simple, has adopted 4f spatial filter imaging optical path system, as shown in Fig. 1 (a), only needs A conventional computational hologram (CGH), a birefringent polarizing beam splitter (BBS), two Fourier lenses (first Fourier lens Lens1 and second Fourier lens Lens2) and a filter aperture (FA ), there is no need to insert any optical components between the CGH and the BBS. As shown in Figure 1(b), the computational hologram (CGH) is placed on the front focal plane P1 of the first Fourier lens Lens1, and the birefringent polarizing beam splitter (BBS) is placed on the front focal plane of the first Fourier lens Lens1 Between P1 and the first Fourier lens Lens1 , the filter aperture (FA) is placed on the rear focal plane (that is, the spatial spectrum plane) P2 of the first Fourier lens Lens1 . A second Fourier lens Lens2 is placed between the filter aperture and the output facet. The birefringent polarizing beam splitter (BBS) can be a Wollaston prism or a Logger prism, or a simple birefringent micro-angle beamsplitter prism.

The birefringent polarization beam splitter BBS is assumed to be a birefringent Wollaston prism with a beam splitting angle of 2α, and the distance between the prism and the CGH is d. To simplify the analysis, assume that the focal lengths of the two Fourier lenses (Lens1 and Lens2) are both f. At the same time, by reversing the coordinates of the output plane P3 and the coordinates of the input plane P1 (that is, the front focal plane P1 ), the sign change produced by the double Fourier transformation of the light field through the two Fourier lenses is eliminated.

It can be seen from Fig. 1(a) that due to the birefringent polarizing beam splitter (BBS) inserted between the first Fourier lens Lens1 and the CGH, the light field passing through the CGH produces two For the mutually misaligned images, one is horizontal (along x-axis) linearly polarized light, and the other is vertical (along y-axis) linearly polarized light, and the misalignment of the two images is equal to x _α =d tan(α).

Assume that the complex amplitude transmittance function of the CGH located at the input surface P1 is t(x, y); the incident light illuminating the CGH is linearly polarized plane light, and its polarization direction forms an angle θ ₀ with the x-axis. In order to make the finally generated vector light beam propagate along the optical axis, the spatial frequency component of the illumination light along the y direction is set as k _α =2πsin(α)/λ, where λ is the wavelength of the illumination light. Regardless of the filter aperture FA at the spatial spectrum plane P2, the output light field at the output plane P3 can be expressed as the following Jones vector form:

Among them, E ₀ is the amplitude of the incident light, j is the imaginary number sign; C1 and C2 are two constants less than 1, which are used to characterize the transmission efficiency of CGH to two orthogonal polarization states, respectively. For an isotropic CGH, C1 is usually equal to C2; in this case, the polarization direction angle _θ0 of the incident light can be set to 45 degrees. If the CGH is anisotropic (for example: using a liquid crystal spatial light modulator to output CGH), C1 is usually not equal to C2; at this time, C ₁ cosθ ₀ =C ₂ sinθ _{0 can be adjusted by adjusting the angle θ 0 .} In this way, (1) can be simplified as:

Since an arbitrary two-dimensional vector beam can be decomposed into two orthogonal polarization components, the complex amplitude distribution of the vector beam can be expressed by the following Jones vector:

where u _x and u _y are the respective complex amplitudes of the two orthogonal polarization components, (a _x , a _y ) and are the amplitude and phase of the two orthogonal polarization components, respectively. Utilizing the polarization imaging characteristics of the optical path shown in Figure 1(b), the complex amplitudes u _x and u _y of the two orthogonal polarization components of the vector beam to be generated can be properly translated and encoded into the two components of the computational hologram (CGH). Different diffraction directions, and set the appropriate carrier frequency, so that when the CGH is illuminated with appropriate illumination light, its corresponding diffraction reproduction image can just achieve polarization superposition on the output surface. For example, in the coordinate system shown in Figure 1(b), u _x and u _y can be encoded into the diffraction directions at +45 degrees and -45 degrees from the x-axis respectively and have their carrier frequencies along the x-axis components are exp(jk _α x) and exp(-jk _α x); the coordinate translations of u _x and u _y are +x _α and -x _α respectively. After such diffracted light passes through the birefringent polarization beam splitter BBS and the filter aperture FA, the vector beam shown in formula (3) can just be generated on the output surface P3.

Taking the commonly used modified off-axis interferometric computational hologram (CGH) as an example, the CGH in the present invention can be coded according to the following formula:

Where a ₀ and a ₁ are constants greater than 0. The reason why the computational hologram CGH is encoded in this way is because when such a hologram is placed on the input surface P1 of the optical path shown in Figure 1, the output light field at the output surface P3 of the system will have the following form:

Equation (6) can be derived by substituting (5) into (2). It can be seen from formula (6) that the second term is exactly the required vector beam.

Although there are some redundant items in the formula (6), these redundant items can be eliminated by spatial filtering, because the spatial spectrum of the light field shown in the formula (6), that is, it is in the spatial spectrum plane of the system The light field distribution on P2 is just proportional to the Fourier transform of formula (6), namely:

Among them, ξ ₀ =η ₀ =f sinα, F{} represents the Fourier transform operation, with are the spatial frequency spectrums of the complex amplitudes u _x and u _y respectively, and δ() represents the Dilatus function. Figure 2(a) shows a schematic diagram of the spatial spectrum distribution shown in formula (7). Fig. 2(b) is a schematic diagram of the distribution of the spatial frequency spectrum on the spatial frequency spectrum plane P2 if the birefringent polarization beam splitter BBS is not placed in the optical path. It can be seen from Fig. 2 that it is only necessary to place a filter aperture FA with a radius R≤f sinα at the position marked by the dotted circle in Fig. 2(a), and all other unnecessary items except the second term in formula (6) Both terms can be blocked by the filter aperture FA, and only the second term that produces the desired vector light field is allowed to pass.

According to the above theoretical analysis, the present invention produces the method for arbitrary vector light beam, and concrete implementation steps are:

(a) Give the complex amplitude distributions u _x (x,y) and u _y (x,y) of the Jones vector or its orthogonally polarized component of the vector beam to be generated.

(b) Design the required computational hologram according to equation (5), where the parameters are set as k _α =2πsin(α)/λ and x _α =dtan(α).

(c) Place the designed CGH at the input surface P1 of the system shown in Fig. 1, and irradiate it with an inclined plane beam or a Gaussian beam.

(d) Place a filter aperture (FA) with a radius R equal to or smaller than f sinα on the spatial spectrum plane P2 of the system corresponding to the second item in formula (7), so that only the light corresponding to the second item Able to pass filter aperture (FA). The light passing through the filter aperture (FA) passes through the second Fourier lens Lens2 to obtain the required vector light beam at the output surface P3. The second Fourier lens Lens2 is only used to transform the generated vector beam into its distribution on the computational hologram (CGH); lens Lens2 can be removed in many practical applications.

The feasibility of the present invention is further proved by experiments. In the experiment, the incident light wave used is a laser with a wavelength of 632.8nm. The birefringent polarizing beam splitter (BBS) used is a calcite Wollaston prism with a beam splitting angle of about 2α=0.25°, and the distance between the BBS and the input plane P1 is d≈25 mm. Both Fourier lenses used have a focal length of f=300 mm. The vector beam generated by the experiment is a vector Laguerre-Gaussian (LG) beam, and its Jones vector is:

in

In the formula, (r, θ) is a polar coordinate, namely θ=tan ^-1 (y/x); C _nm is the normalization constant, ω ₀ is the beam width parameter, For Laguerre polynomials, m and n are integers. The LG beam is a typical optical vortex, and the topological core of the optical vortex is equal to the integer m. There are two orthogonally polarized vortex components in the vector LG beam, and the topological charges of the two orthogonally polarized vortex components can take different values.

Figure 3 shows an example of a vector beam experimentally produced by the method of the present invention. The design parameters of the vector beam in the experiment are: u _x =U _1,4 (x,y) (corresponding to parameters n=1 and m=4) and u _y =U _2,1 (x,y) (corresponding to parameters n =2 and m=1). Fig. 3(a) is the total intensity distribution of the vector beam obtained at the output surface P3 of the system. Figure 3(b), (c) and (d) respectively show the intensity distribution of the 45-degree direction polarization component, the horizontal (x direction) polarization component and the vertical (y direction) polarization component of the generated vector beam. In order to further reveal the phase distribution characteristics of the two orthogonally polarized components of the vector beam, Figure 3(e) and Figure 3(f) also respectively show the two orthogonally polarized components (horizontal polarization and vertical polarization) of the vector beam ) and a plane-polarized light interference pattern. The fringe distribution characteristics of the interference pattern show that its horizontal polarization component is an optical vortex with a topological kernel m=4, and its vertical polarization component is an optical vortex with a topological kernel m=1. The vector beam parameters generated by the above experiments are consistent with the design parameters.

It should be noted that the beam splitting angle of the birefringent polarization beam splitter BBS used in the above experiments is not an optimal value. Theoretically, the larger the beam splitting angle of the BBS is, the higher the spatial resolution of the generated vector beam will be. However, the size of the beam splitting angle is limited by the effective bandwidth of the computational hologram CGH used in the experiment.

Compared with the existing technology for generating vector beams, the present invention is simpler and more practical. Especially in the present invention, there is no need to insert other beam splitting and polarization conversion devices between the computational hologram CGH and the birefringent polarization beam splitter, so it is easier to integrate and apply, and the two orthogonal polarization components of the generated vector beam The extinction ratio can be lower than 10 ^-5 , which can generate high-quality vector beams.

Claims (2)

1. a kind of method that vector beam is produced based on birefringent polarizing beam splitter, it is characterized in that, comprise the following steps：

（1）Prepare computed hologram：

1. computed hologram is designed：Any vector beam to be produced is resolved into two orthogonal polarization components first and asked respectively Go out the amplitude and phase distribution of the two orthogonal polarization components；Then it is using computed hologram coding method that the two are orthogonal partially Shake the amplitude of component and phase distribution is separately encoded onto two different diffraction directions；

2. the computed hologram designed is prepared；

（2）The computed hologram of preparation is placed on to the front focal plane of the first fourier lense, in preceding Jiao of the first fourier lense A birefringent polarizing beam splitter is placed between face and the first fourier lense, filter is placed in the back focal plane of the first fourier lense Wave hole footpath, places second fourier lense between filtering apertures and output face；In computed hologram and birefringent polarizing point Other elements are not inserted between beam device；

（3）With a planar light beam or Gaussian beam irradiation computed hologram, through computed hologram light beam through in first Fu Leaf lens transformation, then aperture is filtered after filtering, the spatial frequency domain form of the vector beam required for obtaining；Pass through filtering apertures Light beam pass through the second fourier lense again, required vector beam is obtained at output face.

2. a kind of device that vector beam is produced based on birefringent polarizing beam splitter, by computed hologram, birefringent polarizing beam splitting Device, two fourier lenses, filtering apertures and output face composition, it is characterized in that, it is saturating that computed hologram is arranged on the first Fourier On the front focal plane of mirror, birefringent polarizing beam splitter be arranged on the first fourier lense front focal plane and the first fourier lense it Between, filtering apertures are arranged on the back focal plane of the first fourier lense, and second Fu is placed between filtering apertures and output face In leaf lens.