CN114839788A - Light field center polarization state is along with distance regulation and control system - Google Patents
Light field center polarization state is along with distance regulation and control system Download PDFInfo
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- CN114839788A CN114839788A CN202210492379.7A CN202210492379A CN114839788A CN 114839788 A CN114839788 A CN 114839788A CN 202210492379 A CN202210492379 A CN 202210492379A CN 114839788 A CN114839788 A CN 114839788A
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- 230000010287 polarization Effects 0.000 title claims abstract description 83
- 230000033228 biological regulation Effects 0.000 title claims description 12
- 239000013598 vector Substances 0.000 claims abstract description 19
- 239000003518 caustics Substances 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims abstract description 12
- 230000001276 controlling effect Effects 0.000 claims abstract description 9
- 238000009826 distribution Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 abstract description 16
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- 238000009828 non-uniform distribution Methods 0.000 description 1
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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
- G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
- G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
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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
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/44—Grating systems; Zone plate systems
Abstract
The invention provides a light field center polarization state regulating and controlling system along with distance, which comprises a holographic grating generator carrying target phase information, a 4f system used for coherently superposing different orders into a radially polarized and variable caustic light field, a linear polarizer and a CCD (charge coupled device) receiving device, wherein a wave plate used for changing the polarization state of a light beam is arranged in the 4f system, can generate a vector light field with a controllable central polarization state without any optical element, thereby being applied to the industry with flexible control requirements on the polarization state, not only realizing the control on the central line polarization state of the structured light field in the transmission process, but also realizing the control on the hybrid polarization state, the central polarization state has both linear polarization and circular polarization, and the polarization state can be converted by regulating and controlling the parameters corresponding to the light field.
Description
Technical Field
The invention relates to the technical field of photoelectricity, in particular to a system for regulating and controlling the central polarization state of an optical field along with distance.
Background
Researchers never stopped exploring photophysics, not only because optical research pushed the development of physics, but more importantly, the application of light was closely related to life. How to effectively regulate and control the polarization and the phase of the light field and obtain the light field with unique performance becomes one of the research hotspots in the current optical field. The light field regulation ranges from frequency domain, time domain, and spatial domain. The frequency domain freedom is frequency and wavelength, the time domain freedom is pulse width (linearity), and the space domain freedom includes phase, amplitude and polarization state. The regulation and control of the polarization state of the light field in the space domain are more complex than the amplitude and the phase, the polarization state is used as one of important attributes of a vector light field, the diffraction and the space-time evolution of the light wave are influenced significantly, and unprecedented opportunities are provided. In order to discover more novel optical phenomena, more and more researchers are focusing on polarization modulation of an optical field, so that spatial non-uniform modulation of a polarization state is a research hotspot in the optical field at present. The polarization modulated light field constitutes a novel laser mode with a spatially varying polarization state, called a vector light field. The vector light field refers to a light field with different polarization states at different positions on the same wave front at the same time, and is also called a light field with non-uniform distribution of the polarization states.
Due to different application places of different polarized light, the concept of polarization can be used in various aspects such as camera lenses, automobile front tail lamps, automobile front windows, liquid crystal screens and three-dimensional movie lamps. But is generally not controllable because the orientation of the polarizer is single. Therefore, in some fields, if light in different directions or different polarization states capable of being flexibly converted is desired to be used, only some optical elements can be manually added to realize rotation of linear polarization or interconversion of linear polarization and circular polarization. This clearly increases the cost and increases the uncontrollable factors, which also increases the size and flexibility of the prototype. Therefore, the realization of the adjustment of the polarization state without any components is a problem to be solved at present.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a system for regulating and controlling the central polarization state of an optical field along with the distance, and a vector optical field with the central polarization state capable of being regulated and controlled is generated on the premise of not using any optical element.
Technical scheme
A system for regulating and controlling the central polarization state of an optical field along with distance comprises a holographic grating generator carrying target phase information, a 4f system used for coherently superposing different orders into a radially polarized and variable caustic optical field, a linear polarizer and a CCD (charge coupled device) receiving device, wherein a wave plate used for changing the polarization state of a two-stage light beam is arranged in the 4f system.
Further, the vector caustic beam of radial polarization variation generated by the holographic grating generator in combination with the 4f system and the wave plate is represented as:
wherein A is 0 The amplitude of the wave is represented by,
w 0 is the waist spot radius of the fundamental mode Gaussian beam, akr denotes the caustic phase, a is the caustic coefficient, k 2 pi/lambda is the wavenumber, l is the radial polarization topological charge, e x And e y Are unit vectors in the x-direction and y-direction, respectively, and Δ θ represents e x And e y The phase difference between them.
Further, the wave plate is a half-wave plate or a quarter-wave plate, and if the quarter-wave plate is adopted, the phase difference of the components in the x direction and the y direction is 0, namely no phase difference exists; if a half-wave plate is used, the phase difference between the two orthogonal components is pi/2.
Furthermore, the polarized components along the horizontal direction and the vertical direction can be obtained through the linear polarizers in different directions, finally, the CCD receiving device can record the light intensity diagrams and the total light intensity diagrams polarized along the horizontal direction and the vertical direction, and the polarized state distribution of the corresponding position can be known through the vector superposition of two orthogonal polarized components at different positions, so that the regulation and control of the central polarized state are realized.
Advantageous effects
Compared with the prior art, the invention has the following beneficial effects:
the flexibility is high, the device is suitable for the field with complicated and dynamic requirements on the same polarization state, and the structure is simple;
the method can generate the vector light field with the central polarization state capable of being regulated without any optical component, thereby being applied to the industry with flexible control requirements on the polarization state, not only realizing the central line polarization state regulation and control of the structural light field in the transmission process, but also realizing the regulation and control of the hybrid polarization state, namely, the central polarization state has online and circular polarization at the same time, and still realizing the conversion of the polarization state through regulating and controlling the parameters corresponding to the light field.
Drawings
FIG. 1 is a schematic structural diagram of a system for regulating and controlling the central polarization state of a light field according to distance according to the present invention;
FIG. 2 is a graph of the rate of change of polarization state at different radial topological charge numbers l when propagating to the same distance;
FIG. 3 is a polarization state distribution diagram of a vector caustic field with a central polarization state of linear polarization and hybrid polarization.
Reference numerals
Holographic grating generator a, 4f system B, wave plate C, linear polarizer D, CCD receive device E.
Detailed Description
For a better illustration of the invention, reference is made to the following description, taken in conjunction with the accompanying drawings and examples:
as shown in fig. 1 to 3, a system for regulating and controlling the central polarization state of an optical field with distance includes a holographic grating generator a carrying target phase information, a 4f system B for superimposing different orders of coherence into a radially polarized and variable caustic optical field, a linear polarizer D, and a CCD receiver E, wherein a wave plate C for changing the polarization state of a two-order light beam is disposed in the 4f system B.
Further, the vector caustic beam of radial polarization variation generated by the holographic grating generator a in combination with the 4f system B and the wave plate C is represented as:
wherein A is 0 The amplitude of the wave is represented by,
w 0 is the waist spot radius of the fundamental mode Gaussian beam, akr denotes the caustic phase, a is the caustic coefficient, k 2 pi/lambda is the wavenumber, l is the radial polarization topological charge, e x And e y Are unit vectors in the x-direction and y-direction, respectively, and Δ θ represents e x And e y The phase difference between them.
Further, the wave plate C is a half-wave plate or a quarter-wave plate, and if the quarter-wave plate is adopted, the phase difference between the x-direction component and the y-direction component is 0, that is, there is no phase difference; if a half-wave plate is used, the phase difference between the two orthogonal components is pi/2.
Further, polarization components in the horizontal and vertical directions can be obtained through the linear polarizing plates D in different directions, finally, the CCD receiving device E can record light intensity graphs polarized in the horizontal and vertical directions and a total light intensity graph, and the polarization state distribution of the corresponding position can be known through the superposition of two orthogonal polarization component vectors in different positions, so that the regulation and control of the central polarization state are realized.
Further, linear polarization and hybrid polarization can be obtained by changing the position of the wave plate C according to the distance.
Further, the polarization state conversion rate can be controlled by changing the radial polarization topological charge number l.
Furthermore, by designing reasonable parameters, the light field with controllable target polarization state can be obtained.
Specifically, the light source is a 532nm laser source, the change of central polarization into linear polarization can be realized through a light field central polarization state along with a distance regulation and control system, and the hybrid polarization can be regulated and controlled by changing the type or position of the wave plate C;
FIG. 2 illustrates the change rate (period) of the polarization state with the radial topological charge number l of the vector caustic beam at the same distance, and as can be seen from FIG. 2, the change rate of the polarization state is accelerated with the increase of the topological charge number l;
fig. 3 shows the distribution diagram of the light intensity of the vector caustic beam in the x-z plane at the same distance, including the central polarization state, where l ═ 5 denotes Δ θ ═ 0, the central polarization state changes are all local linear polarizations, l ═ 10 denotes Δ θ ═ pi/2, the central polarization state changes are all hybrid polarization distribution diagrams, where red and purple denote left and right elliptical polarizations, and black lines denote linear polarizations, which can be easily found from fig. 3.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the technical solutions of the present invention have been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions described in the foregoing embodiments can be modified or some technical features can be replaced equally; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A light field center polarization state is along with distance regulation and control system which characterized in that: the holographic grating light field polarization state detector comprises a holographic grating generator (A) carrying target phase information, a 4f system (B) used for coherently superposing different orders into a radially polarized and variable caustic light field, a linear polarizer (D) and a CCD receiving device (E), wherein a wave plate (C) used for changing the polarization state of a two-order light beam is arranged in the 4f system (B).
2. The system of claim 1, wherein the central polarization state of the vector caustic beam-based system comprises: the vector caustic beam of radial polarization variation generated by the holographic grating generator (A) in combination with the 4f system (B) and the wave plate (C) is represented as:
wherein A is 0 The amplitude of the wave is represented by,
w 0 is the waist spot radius of the fundamental mode Gaussian beam, akr denotes the caustic phase, a is the caustic coefficient, k 2 pi/lambda is the wavenumber, l is the radial polarization topological charge, e x And e y Are unit vectors in the x-direction and y-direction, respectively, and Δ θ represents e x And e y The phase difference between them.
3. A light field central polarization state regulating and controlling system according to claim 2, characterized in that: the wave plate (C) is a half-wave plate or a quarter-wave plate, if the quarter-wave plate is adopted, the phase difference of components in the x direction and the y direction is 0, namely no phase difference exists; if a half-wave plate is used, the phase difference between the two orthogonal components is pi/2.
4. A light field central polarization state with distance regulation system according to claim 3, characterized in that: the polarized components in the horizontal direction and the vertical direction can be obtained through the linear polarizing films (D) in different directions, finally, the CCD receiving device (E) can record the light intensity graphs polarized in the horizontal direction and the vertical direction and the total light intensity graph, and the polarized state distribution of the corresponding position can be known through the superposition of two orthogonal polarized component vectors in different positions, so that the regulation and control of the central polarized state are realized.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090386A (en) * | 2014-07-30 | 2014-10-08 | 东南大学 | Method for regulating light field polarization state distribution |
| CN109506579A (en) * | 2018-12-29 | 2019-03-22 | 浙江理工大学 | A kind of distance measurement system and method based on vector vortex light beam |
| CN110082924A (en) * | 2018-12-19 | 2019-08-02 | 浙江理工大学 | A kind of circularly polarized light generating means of the vector beam based on radial polarisation variation |
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- 2022-05-07 CN CN202210492379.7A patent/CN114839788A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104090386A (en) * | 2014-07-30 | 2014-10-08 | 东南大学 | Method for regulating light field polarization state distribution |
| CN110082924A (en) * | 2018-12-19 | 2019-08-02 | 浙江理工大学 | A kind of circularly polarized light generating means of the vector beam based on radial polarisation variation |
| CN109506579A (en) * | 2018-12-29 | 2019-03-22 | 浙江理工大学 | A kind of distance measurement system and method based on vector vortex light beam |
Non-Patent Citations (1)
| Title |
|---|
| RUI-PIN CHEN: "Flexible Manipulation of the Polarization Conversions in a Structured Vector Field in Free Space", 《LASER PHOTONICS REV》, pages 1700165 * |
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