CN109991750B - Square array vortex light beam generating device, spiral light beam generating device and application - Google Patents
Square array vortex light beam generating device, spiral light beam generating device and application Download PDFInfo
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- CN109991750B CN109991750B CN201910329831.6A CN201910329831A CN109991750B CN 109991750 B CN109991750 B CN 109991750B CN 201910329831 A CN201910329831 A CN 201910329831A CN 109991750 B CN109991750 B CN 109991750B
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/0944—Diffractive optical elements, e.g. gratings, holograms
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
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Abstract
The disclosure provides a square array vortex light beam generating device, a spiral light beam generating device and application. The square array vortex light beam generating device comprises a first light splitting prism, a second light splitting prism and a third light splitting prism, wherein the first light splitting prism is used for splitting parallel light beams into two paths, and one path of the parallel light beams penetrates through a first quarter-wave plate and is reflected to a first two-dimensional orthogonal grating through a first plane mirror; the other path of light passes through a second quarter-wave plate and is reflected to a second two-dimensional orthogonal grating through a second plane mirror; obtaining four point light sources with the brightest central area through a first two-dimensional orthogonal grating and a first filter; obtaining four point light sources with the brightest central area through a second two-dimensional orthogonal grating and a second filter; four point light sources respectively obtained by the first filter and the second filter pass through the second light splitting prism and then pass through the third Fourier lens to generate square array vortex light beams.
Description
Technical Field
The disclosure belongs to the field of optics, and particularly relates to a square array vortex light beam generation device, a spiral light beam generation device and application.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
A square array of vortex beams is typically implemented using a liquid crystal spatial light modulator. The liquid crystal spatial light modulator is based on the birefringence effect of liquid crystal molecules under active control, and controls the molecular orientation of the liquid crystal molecules through an external electric field so as to realize the modulation of an optical field. The method can conveniently load information into a one-dimensional or two-dimensional optical field, and quickly process the loaded information by utilizing the advantages of wide bandwidth of light, multi-channel parallel processing and the like. It is the core device of the system for real-time optical information processing, optical interconnection, optical computation, etc.
The square array space spiral light beam has special intensity distribution characteristics, in the light transmission direction, the intensity distribution of the light field can correspondingly rotate along with the change of the transmission distance, and the spiral light intensity distribution characteristics similar to DNA molecules are formed in the space. Due to the special intensity distribution characteristics, the method can be applied to the fields of three-dimensional material processing, particle control, optical communication and the like, such as processing of three-dimensional photonic crystals and optical waveguides with spiral structures by adopting a holographic interference method. The array spiral beam can be realized by superposing an array vortex beam and an axial plane wave. At present, array vortex light beams can be obtained through an amplitude type or phase type spatial modulator, and the array spatial spiral light beams can be generated by interference superposition of axial plane waves.
However, the inventor found that, since the spatial light modulator includes many independent units spatially arranged in a one-dimensional or two-dimensional array, individual control of each liquid crystal unit can be realized by a complicated thin film transistor circuit, thereby realizing modulation of light waves illuminated thereon, which results in a complicated structure and a high price of the spatial light modulator itself; on the other hand, the pixel size of the spatial light modulator is large, and it is difficult to generate an array vortex beam of a small scale.
Disclosure of Invention
In order to solve the above problems, a first aspect of the present disclosure provides a square array vortex beam generating device, which has a simple and intuitive optical path, is easy to implement, and has a high energy utilization rate.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a square array vortex beam generating device comprising:
the first light splitting prism is used for splitting the parallel light beams into two paths, and one path of parallel light beam passes through the first quarter-wave plate and is reflected to the first two-dimensional orthogonal grating through the first plane mirror; the other path of parallel light beam passes through a second quarter-wave plate and is reflected to a second two-dimensional orthogonal grating through a second plane mirror;
the light field generated by the first two-dimensional orthogonal grating passes through a first Fourier lens to obtain a frequency spectrum at a focal plane, and then four point light sources with brightest central areas are obtained through a first filter; the light field generated by the second two-dimensional orthogonal grating passes through a second Fourier lens to obtain a frequency spectrum at a focal plane, and then four point light sources with the brightest central areas are obtained through a second filter;
four point light sources respectively obtained by the first filter and the second filter pass through the second light splitting prism and then pass through the third Fourier lens to generate square array vortex light beams.
A second aspect of the present disclosure provides a square array spatial spiral beam generating device, which is simple in structure and low in cost.
In order to achieve the purpose, the following technical scheme is adopted in the disclosure:
a square array spatial spiral beam generating apparatus comprising:
the square array vortex light beam generating device is used for generating square array vortex light beams;
and the controller is connected with the first filter or the second filter in the square array vortex light beam generating device and is used for controlling the first filter or the second filter to output a point light source with a central zero order and generate a square array spatial spiral light beam after the point light source interferes with the square array vortex light beam.
A third aspect of the present disclosure provides the use of a square array vortex beam generating device.
The utility model discloses a square array vortex beam generating device is applied to square array space spiral beam generating device for produce square array space spiral beam.
The square array vortex light beam generating device is applied to a particle sorting device and used for sorting different types of particles.
The square array vortex light beam generating device is applied to an information transmission device and used for information transmission.
The beneficial effects of this disclosure are:
(1) the optical path is simple and visual, the realization is easy, and the price of the two-dimensional orthogonal grating is low, so that the whole device has a simple structure, the cost is reduced, and the square array vortex light beam effect is obtained by adopting a multi-beam interference technical means.
(2) The method generates the square array space spiral light beam by utilizing interference of the square array vortex light beam and one beam of parallel light beam, so that the intensity distribution of the square array space spiral light beam is distributed in a spiral structure along the optical axis.
(3) The square array space spiral beam generating device has the excellent characteristic of low price, and has certain application space in the fields of material processing, particle shunting, information transmission and the like.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure.
Fig. 1 is a schematic structural diagram of a device for generating a square array spatial spiral beam according to an embodiment of the present disclosure.
Fig. 2 is a schematic structural diagram of another apparatus for generating a square array spatial spiral beam according to an embodiment of the present disclosure.
Fig. 3(a) is a first phase type two-dimensional orthogonal grating provided in the first embodiment of the disclosure.
Fig. 3(b) is a normalized distribution of absolute values of complex amplitudes of a light field of the first phase-type two-dimensional orthogonal grating at the lens back focal plane through the first fourier lens according to an embodiment of the present disclosure.
Fig. 3(c) is a normalized light intensity distribution of the light field of the first optical branch at the Charge Coupled Device (CCD) according to an embodiment of the present disclosure.
Fig. 3(d) is a phase distribution of the optical field corresponding to fig. 3(c) provided in the first embodiment of the disclosure.
Fig. 4(a) is a second phase type two-dimensional orthogonal grating provided in the first embodiment of the disclosure.
Fig. 4(b) is a normalized distribution of the absolute value of the complex amplitude of the frequency spectrum of the light field of the second phase type two-dimensional orthogonal grating at the lens back focal plane through the second fourier lens according to the first embodiment of the disclosure.
Fig. 4(c) is a normalized light intensity distribution of the light field of the second optical branch at the Charge Coupled Device (CCD) according to an embodiment of the present disclosure.
Fig. 4(d) is a phase distribution of the optical field corresponding to fig. 4(c) provided in the first embodiment of the disclosure.
FIG. 5(a) is a normalized intensity distribution of a periodic array vortex beam provided by an embodiment of the present disclosure.
Fig. 5(b) is a phase distribution of a periodic array vortex beam provided by an embodiment of the present disclosure.
Fig. 5(c) is an intensity distribution of the optical field of the minimum unit of the vortex beam of the periodic array provided by the first embodiment of the present disclosure.
Fig. 5(d) is an intensity phase distribution of the optical field of the minimum unit of the vortex beam of the periodic array provided by the first embodiment of the present disclosure.
Fig. 6(a) is a two-dimensional orthogonal grating of a first amplitude type provided in the second embodiment of the present disclosure.
Fig. 6(b) is a distribution of absolute values of complex amplitudes of a spectrum of a light field passing through the first amplitude type two-dimensional orthogonal grating at the lens back focal plane through the first fourier lens, which is provided by the second embodiment of the present disclosure.
Fig. 6(c) is a normalized light intensity distribution of the light field of the first optical branch at the Charge Coupled Device (CCD) according to the second embodiment of the present disclosure.
Fig. 6(d) is a light field phase distribution situation corresponding to fig. 6(c) provided in the second embodiment of the present disclosure.
Fig. 7(a) is a second amplitude type two-dimensional orthogonal grating provided in the second embodiment of the present disclosure.
Fig. 7(b) is a distribution of absolute values of complex amplitudes of the spectrum of the light field passing through the second two-dimensional orthogonal grating of the first amplitude type at the lens back focal plane through the second fourier lens, which is provided by the second embodiment of the present disclosure.
Fig. 7(c) is a normalized light intensity distribution of the light field of the second optical branch at the Charge Coupled Device (CCD) according to the second embodiment of the disclosure.
Fig. 7(d) is a light field phase distribution situation corresponding to fig. 7(c) provided in the second embodiment of the present disclosure.
Fig. 8(a) is a schematic diagram of a first filter provided in the second embodiment of the disclosure.
Fig. 8(b) is a schematic diagram of a second filter provided in the second embodiment of the disclosure.
Fig. 9(a) is a normalized intensity distribution of the generated periodic array vortex beam provided by the second embodiment of the present disclosure.
Fig. 9(b) is a phase distribution of the generated periodic array vortex beam provided by the second embodiment of the present disclosure.
Fig. 9(c) is the intensity distribution of the optical field of the minimum unit of the periodic array vortex beam provided by the second embodiment of the present disclosure.
Fig. 9(d) is a phase distribution of the optical field of the periodic array vortex beam minimum unit provided by the second embodiment of the present disclosure.
Fig. 10 is a schematic diagram of a second filter allowing a bright spot in the center of a spectrum to pass through according to the second embodiment of the disclosure.
Fig. 11(a) is a normalized light intensity distribution of a light field corresponding to a position of an optical axis of the CCD after the filter is modified according to the second embodiment of the disclosure.
Fig. 11(b) is a normalized light intensity distribution of the light field corresponding to the CCD shifted backward by Δ along the optical axis after the filter is modified according to the second embodiment of the disclosure, where Δ is a preset distance.
Fig. 11(c) is a normalized light intensity distribution of the light field corresponding to the CCD shifted backward by 2 Δ along the optical axis after the filter is modified according to the second embodiment of the disclosure.
Fig. 11(d) is a normalized light intensity distribution of the light field corresponding to the CCD shifted backward by 3 Δ along the optical axis after the filter is modified according to the second embodiment of the disclosure.
The system comprises a laser source 1, a beam expanding collimator 2, a beam expanding collimator 3, a first beam splitting prism 4, a first quarter wave plate 5, a first plane mirror 6, a first phase type two-dimensional orthogonal grating 7, a first Fourier lens 8, a first filter 9, a second beam splitting prism 10, a third Fourier lens 11, a charge coupling element 12, a second quarter wave plate 13, a second plane mirror 14, a second phase type two-dimensional orthogonal grating 15, a second Fourier lens 15 and a second filter 16.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present disclosure, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only relational terms determined for convenience in describing structural relationships of the parts or elements of the present disclosure, and do not refer to any parts or elements of the present disclosure, and are not to be construed as limiting the present disclosure.
In the present disclosure, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present disclosure can be determined on a case-by-case basis by persons skilled in the relevant art or technicians, and are not to be construed as limitations of the present disclosure.
Interpretation of terms:
two-dimensional orthogonal grating: the grating has corresponding periodic structures in two mutually perpendicular (orthogonal) directions, horizontal and vertical.
Phase type two-dimensional orthogonal grating: a two-dimensional orthogonal grating that adjusts only the phase distribution of the light field;
amplitude type two-dimensional orthogonal grating: only the amplitude distribution of the light field is changed.
CCD is a charge-coupled device, which is a detecting element that uses charge to express signal magnitude and uses coupling mode to transmit signal, and has the advantages of self-scanning, wide sensing spectrum range, small distortion, small volume, light weight, low system noise, low power consumption, long service life, high reliability, etc., and can be made into a very high-integration-level assembly. A Charge Coupled Device (CCD) is a new type of semiconductor device developed in the early 70 s of the 20 th century.
Since the two-dimensional orthogonal grating includes two types, namely, a phase type and an amplitude type, the square array vortex beam generating device can be realized by using two phase type two-dimensional orthogonal gratings or two amplitude type two-dimensional orthogonal gratings.
Example one
The following is a detailed description of two phase type two-dimensional orthogonal gratings as an example:
as shown in fig. 1, the square array vortex beam generating device of the present embodiment includes:
the first light splitting prism 3 is used for splitting the parallel light beams into two paths, wherein one path of the parallel light beam passes through the first quarter-wave plate 4 and is reflected to the first phase type two-dimensional orthogonal grating 6 by the first plane reflector 5; the other path of parallel light beam passes through a second quarter-wave plate 12 and is reflected to a second phase type two-dimensional orthogonal grating 14 by a second plane mirror 13;
the light field generated by the first phase type two-dimensional orthogonal grating 6 passes through a first Fourier lens 7 to obtain a frequency spectrum at a focal plane, and then four point light sources with brightest central areas are obtained through a first filter 8; the light field generated by the second phase type two-dimensional orthogonal grating 14 passes through a second Fourier lens 15 to obtain a frequency spectrum at a focal plane, and then four point light sources with the brightest central area are obtained through a second filter 16;
four point light sources obtained by the first filter 8 and the second filter 16 respectively pass through the second light splitting prism and then pass through the third Fourier lens 10 to generate a square array vortex light beam, and the square array vortex light beam is recorded by a charge coupled device.
In another embodiment, as shown in fig. 2, a quadrature phase grating-based square array vortex beam generating apparatus further includes: a laser light source 1 and a beam expanding collimator lens 2.
The first fourier lens 7, the second fourier lens 15 and the third fourier lens 10 have the same focal length f.
Laser emitted by the laser source 1 passes through the beam expanding collimating lens 2 to obtain a large-caliber parallel light beam. The large-caliber parallel light beams are divided into two paths through the first beam splitter prism 3 and then pass through the quarter-wave plate. The fast axis of the quarter-wave plate arranged in one optical branch is consistent with the polarization direction of light, and the slow axis of the quarter-wave plate arranged in the other optical branch is consistent with the polarization direction of light, so that a quarter-wave phase difference, namely pi/2, can be introduced into the two branches. After passing through the quarter-wave plate, the two paths of light are reflected by the plane mirror and then enter the two phase type two-dimensional orthogonal gratings. Assume that a phase type two-dimensional grating used in the first optical branch is as shown in fig. 3 (a). The ratio of the period lengths of the first phase type two-dimensional orthogonal grating in the vertical and horizontal directions is 2: 1, the phase change amount of the light beam by the light gray lattice and the black lattice differs by half a wavelength, the phase corresponding to the black lattice is-pi, and the phase corresponding to the light gray lattice is 0. Fig. 3(b) is a normalized distribution of the absolute value of the complex amplitude of the spectrum of the light field passing through the first phase type two-dimensional orthogonal grating at the lens back focal plane through the first fourier lens, where there are four brightest spots in the central region. The first filter is set to only select the four bright spots (approximately regarded as ideal point light sources) to pass through, the four point light sources passing through the first filter are reflected by the second beam splitter prism and then pass through the third Fourier lens behind, and the CCD can record the light intensity distribution condition of the corresponding light field. Fig. 3(c) is a normalized light intensity distribution of the light field of the first optical branch at the CCD, fig. 3(d) is a corresponding light field phase distribution, the phase difference corresponding to the black lattice and the light gray lattice is half a wavelength, the phase corresponding to the black lattice is-pi, and the phase corresponding to the light gray lattice is 0.
The second phase type two-dimensional orthogonal grating used in the second optical branch is rotated by 90 degrees with respect to the grating used in the first optical branch, and fig. 4(a) shows the second phase type two-dimensional orthogonal grating used in the second optical branch, where the ratio of the period lengths in the vertical and horizontal directions is 1: 2, the phase change amount of the light beam by the light gray lattice and the black lattice differs by half a wavelength, the phase corresponding to the black lattice is-pi, and the phase corresponding to the light gray lattice is 0. Fig. 4(b) is a normalized distribution of the absolute value of the complex amplitude of the frequency spectrum of the light field passing through the second phase type two-dimensional orthogonal grating at the lens back focal plane through the second fourier lens. The second filter is arranged to only select four central bright spots (approximately regarded as ideal point light sources) to pass through, the four point light sources passing through the second filter sequentially penetrate through the second beam splitter prism and the third Fourier lens behind, and the CCD can record the light intensity distribution condition of the corresponding light field. Fig. 4(c) is a normalized light intensity distribution of the light field of the second optical branch at the CCD, and fig. 4(d) is a corresponding light field phase distribution. The phase difference corresponding to the dark gray lattices and the light white lattices is half wavelength, and as the additional phase difference of pi/2 is introduced into the two optical branches through the quarter-wave plate, the phase corresponding to the dark gray lattices is-pi/2, and the phase corresponding to the light white lattices is pi/2.
As can be seen from fig. 3(c), 3(d), 4(c) and 4(d), by adjusting the relative positions of the two phase-type orthogonal gratings, the superposition of the optical fields of the two branches can generate the expected array vortex beam. Fig. 5(a) and 5(b) show normalized intensity distribution and phase distribution of the generated periodic array vortex beam, and it is obvious that the minimum unit of the periodic array vortex beam shown in the figure is 2 × 2 grids. Fig. 5(c) and 5(d) show the intensity distribution and phase distribution of the optical field of the minimum unit, and it can be seen from the diagrams that the directions of increasing the phases of the two vortexes at the diagonal corners of the upper left corner and the lower right corner are clockwise, the topological charge corresponding to the vortexes is +1, and the directions of increasing the phases of the two vortexes at the diagonal corners of the upper right corner and the lower left corner are just opposite and counterclockwise, and the topological charge corresponding to the vortexes is-1. Obviously, by the above method, two vortex beams with topological charge of ± 1 are generated simultaneously.
Example two
When the square array vortex beam generating device is implemented by using two amplitude type two-dimensional orthogonal gratings, the structural form is as shown in fig. 1:
assume that a first amplitude type two-dimensional orthogonal grating used in the first optical branch is as shown in fig. 6 (a). The ratio of the period lengths of the first amplitude type two-dimensional orthogonal grating in both the vertical and horizontal directions is 2: 1, a white grid means completely light transmissive, and a black grid means completely opaque.
Fig. 6(b) is a distribution of absolute values of complex amplitudes of the spectrum of the light field passing through the first amplitude type two-dimensional orthogonal grating at the lens back focal plane through the first fourier lens, where the brightest position in the central region is the zero order, and except for the zero order, four points whose brightness is next to the zero order are located outside the zero order and next to the central zero order, (since the central bright spot is too strong in light intensity, in order to be able to see the other four sub bright spots, fig. 6(b) shows that the absolute values of the normalized complex amplitudes are multiplied by a coefficient 2.
The first filter is arranged to only select four bright spots (approximately regarded as ideal point light sources) with brightness second to the central zero order to pass through, and the four point light sources passing through the first filter are reflected by the second beam splitting prism and then pass through the third Fourier lens, so that the Charge Coupled Device (CCD) can record the light intensity distribution condition of the corresponding light field. Fig. 6(c) is a normalized light intensity distribution of the light field of the first optical branch at the Charge Coupled Device (CCD), fig. 6(d) is a corresponding light field phase distribution, the phase difference corresponding to the black lattice and the light gray lattice is half a wavelength, the phase corresponding to the black lattice is-pi, and the phase corresponding to the light gray lattice is 0.
The amplitude type two-dimensional orthogonal grating used in the second optical branch is rotated by 90 degrees with respect to the grating used in the first optical branch, and fig. 7(a) shows a second amplitude type two-dimensional orthogonal grating used in the second optical branch, in which the ratio of the period lengths in both the vertical and horizontal directions is 1: 2, a white grid means completely light transmissive, and a black grid means completely opaque. Fig. 7(b) shows the distribution of the absolute value of the complex amplitude of the spectrum of the light field passing through the second amplitude type two-dimensional orthogonal grating at the lens back focal plane through the second fourier lens (since the central bright spot is too strong in light intensity, in order to be able to see the other four sub-bright spots, fig. 7(b) shows the absolute value of the normalized complex amplitude multiplied by a factor of 2.
The second filter is arranged to only select four bright spots (approximately regarded as ideal point light sources) with brightness next to the central zero order to pass through, the four point light sources passing through the second filter are transmitted through the second beam splitter prism and the third Fourier lens, and the CCD can record the light intensity distribution condition of the corresponding light field. Fig. 7(c) is a normalized light intensity distribution of the light field of the second optical branch at the CCD, and fig. 7(d) is a corresponding light field phase distribution. The phase difference corresponding to the dark gray lattices and the light white lattices is half wavelength, and as the additional phase difference of pi/2 is introduced into the two optical branches through the quarter-wave plate, the phase corresponding to the dark gray lattices is-pi/2, and the phase corresponding to the light white lattices is pi/2.
Fig. 8(a) and 8(b) are schematic diagrams of the first filter and the second filter, respectively. The white circular hole allows light to pass through.
As can be seen from fig. 6(c), 6(d), 7(c) and 7(d), by adjusting the relative positions of the two orthogonal gratings, the superposition of the optical fields of the two branches can generate the expected array vortex beam.
Fig. 9(a) and 9(b) are respectively the normalized intensity distribution and the phase distribution of the generated periodic array vortex beam, and it is obvious that the minimum unit of the periodic array vortex beam shown in the figure is 2 × 2 grids. Fig. 9(c) and 9(d) respectively show the intensity distribution and the phase distribution of the optical field of the periodic array vortex beam minimum unit, and it can be seen from the diagram that the directions of the phase increases of the two vortices diagonal at the upper left corner and the lower right corner are clockwise, the topological charge corresponding to the vortex is +1, and the directions of the phase increases of the two vortices diagonal at the upper right corner and the lower left corner are just opposite and counterclockwise, and the topological charge corresponding to the vortex is-1.
A square array vortex beam generating device as shown in fig. 1 or fig. 2 is applied to a square array spatial spiral beam generating device for generating a square array spatial spiral beam.
A square array vortex beam generator as shown in FIG. 1 or FIG. 2 is used in a particle sorting device for sorting different types of particles.
A square array vortex beam generating device as shown in FIG. 1 or FIG. 2 is applied to an information transmission device for information transmission.
EXAMPLE III
The present embodiment provides a square array spatial spiral beam generating apparatus, including:
the square array vortex beam generating device according to the first embodiment or the second embodiment, configured to generate a square array vortex beam;
and the controller is connected with the first filter or the second filter in the square array vortex light beam generating device and is used for controlling the first filter or the second filter to output a point light source with a central zero order and generate a square array spatial spiral light beam after the point light source interferes with the square array vortex light beam.
In a specific implementation, the first filter and the second filter are both optical filters capable of passing through a plurality of optical wavelengths, the structure of the optical filters is an existing structure, and selective output of the wavelengths of the first filter and the second filter can be achieved through the controller.
Specifically, fig. 10 is a schematic diagram of a second filter that allows bright spots in the center of the spectrum to pass through.
Fig. 11(a) -11 (d) show the normalized light intensity distribution of the light field corresponding to the CCD gradually moving backward along the optical axis after the filter is changed. As can be seen from fig. 11(a) -11 (d), the intensity distribution of the light field is gradually rotated along the optical axis, partly clockwise and partly counterclockwise, which is identical to the results of fig. 9(a) -9 (d). Obviously, by the above method, a square array of spatial spiral beams has been generated, and two spatial spiral beams of clockwise spiral and counterclockwise spiral are generated at the same time.
The square array spatial spiral beam generating device of the embodiment is applied to a particle sorting device and is used for sorting different types of particles.
The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure, and various modifications and changes may be made to the present disclosure by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.
Claims (10)
1. A square array vortex beam generating device, comprising:
the first light splitting prism is used for splitting the parallel light beams into two paths, and one path of parallel light beam passes through the first quarter-wave plate and is reflected to the first two-dimensional orthogonal grating through the first plane mirror; the other path of parallel light beam passes through a second quarter-wave plate and is reflected to a second two-dimensional orthogonal grating through a second plane mirror;
the light field generated by the first two-dimensional orthogonal grating passes through a first Fourier lens to obtain a frequency spectrum at a focal plane, and then four point light sources with brightest central areas are obtained through a first filter; the light field generated by the second two-dimensional orthogonal grating passes through a second Fourier lens to obtain a frequency spectrum at a focal plane, and then four point light sources with the brightest central areas are obtained through a second filter;
four point light sources respectively obtained by the first filter and the second filter pass through the second light splitting prism and then pass through the third Fourier lens to generate square array vortex light beams.
2. A square array vortex beam generating device as claimed in claim 1 wherein said first and second two-dimensional orthogonal gratings are both phase type two-dimensional orthogonal gratings;
or the first two-dimensional orthogonal grating and the second two-dimensional orthogonal grating are both amplitude type two-dimensional orthogonal gratings.
3. A square array vortex beam generating apparatus as in claim 2,
the ratio of the period lengths of the first two-dimensional orthogonal grating in both the vertical and horizontal directions is 2: 1;
the ratio of the period lengths of the second two-dimensional orthogonal grating in the vertical and horizontal directions is 1: 2.
4. a square array vortex beam generating apparatus as claimed in claim 1 wherein the fast axis of the first quarter wave plate is aligned with the direction of polarization of light and the slow axis of the second quarter wave plate is aligned with the direction of polarization of light.
5. A square array vortex beam generating apparatus as claimed in claim 1 wherein the first fourier lens, the second fourier lens and the third fourier lens have the same focal length.
6. A square array vortex beam generating apparatus as claimed in claim 1, further comprising:
and the laser light source is used for generating parallel beams.
7. A square array vortex beam generating apparatus as claimed in claim 6, further comprising:
and the beam expanding collimating lens is used for generating parallel light beams generated by the laser light source to be expanded, obtaining the parallel light beams with the preset caliber size and transmitting the parallel light beams to the first light splitting prism.
8. A square array vortex beam generating device according to any of claims 1-7 applied to a square array spatial helix beam generating device for generating a square array spatial helix beam;
or applied to a particle sorting device for sorting different types of particles;
or in an information transmission device for information transmission.
9. A square array spatial helix beam generating apparatus, comprising:
a square array vortex beam generating apparatus as claimed in any of claims 1-7 for generating a square array vortex beam;
and the controller is connected with the first filter or the second filter in the square array vortex light beam generating device and is used for controlling the first filter or the second filter to output a point light source with a central zero order and generate a square array spatial spiral light beam after the point light source interferes with the square array vortex light beam.
10. A square array spatial spiral beam generating apparatus as claimed in claim 9, applied to a particle sorting apparatus for sorting different types of particles;
or in an information transmission device for information transmission.
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| CN201910329831.6A CN109991750B (en) | 2019-04-23 | 2019-04-23 | Square array vortex light beam generating device, spiral light beam generating device and application |
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| CN110471187B (en) * | 2019-08-20 | 2021-07-30 | 济南大学 | Device and method for generating three-dimensional array bottle-shaped light beams in hexagonal close-packed distribution |
| CN110568619B (en) * | 2019-08-20 | 2021-09-14 | 济南大学 | Device and method for generating three-dimensional array bottle-shaped light beams distributed in square array |
| CN110568618B (en) * | 2019-08-20 | 2021-09-21 | 济南大学 | Device and method for generating spatial spiral beam array by using periodic binary phase plate |
| CN111103695B (en) * | 2019-11-08 | 2021-09-07 | 中国科学院上海光学精密机械研究所 | Ultrafast laser generating device |
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