CN115469464A - Polarization control device and polarization control method - Google Patents
Polarization control device and polarization control method Download PDFInfo
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 6
- 229910052744 lithium Inorganic materials 0.000 claims description 6
- 238000009826 distribution Methods 0.000 abstract description 3
- GQYHUHYESMUTHG-UHFFFAOYSA-N lithium niobate Chemical compound [Li+].[O-][Nb](=O)=O GQYHUHYESMUTHG-UHFFFAOYSA-N 0.000 description 12
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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
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/0305—Constructional arrangements
- G02F1/0311—Structural association of optical elements, e.g. lenses, polarizers, phase plates, with the crystal
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/03—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on ceramics or electro-optical crystals, e.g. exhibiting Pockels effect or Kerr effect
- G02F1/0305—Constructional arrangements
- G02F1/0316—Electrodes
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Abstract
The embodiment of the invention discloses a polarization control device and a polarization control method, wherein the polarization control device comprises: the polarization modulation unit and the nonlinear medium crystal are sequentially arranged along a common optical axis of an optical path; the polarization modulation unit is used for modulating incident light into linearly polarized light with a preset polarization direction; the nonlinear medium crystal is used for regulating and controlling the refractive index difference of linearly polarized light under the action of an external field so as to output scalar light beams in a required polarization state. The embodiment of the invention can realize the real-time generation of any polarization distribution of the scalar light beam, including linearly polarized light, circularly polarized light and elliptically polarized light, has simple and efficient structure, has the capability of real-time adjustment and control of the polarization state of the scalar light beam, and realizes the high stability and high-quality output of the polarization state of the light beam.
Description
Technical Field
The embodiment of the invention relates to the technical field of optics, in particular to a polarization control device and a polarization control method.
Background
The frequency, phase, intensity and polarization are several important attributes of light, and the control of the polarization of a light beam has important significance and application value in the fields of detection, communication, laser processing, imaging and the like. A polarization controller is a polarization control device proposed to meet such a demand. The generated random polarization scalar light beam can be widely applied to the fields of optical manipulation, optical imaging, laser control and the like.
Polarization controllers for scalar beams are principally classified into two types, a conventional wave plate cascade device and a device having a super-surface structure.
The traditional wave plate cascade device integrates rotatable cascade half-wave plates, quarter-wave plates and other components, and the required polarization state output is realized through the rotation of the wave plates. This device has the simple characteristics of principle, but has following limitation: firstly, the polarization state of incident light needs to be determined in advance, and only then can the corresponding wave plate be rotated to realize the polarization control function, so that the foundation of polarization real-time regulation and control is lacked; secondly, when the polarization state of incident light is suddenly or slightly changed, the real-time control on the polarization state cannot be realized; thirdly, the introduced phase delay is not changed based on the mode of controlling the polarization state by the rotation of the wave plate, and the output of the scalar light beam in any polarization state cannot be realized; fourthly, the control of the polarization state needs to rotate a plurality of half-wave plates and quarter-wave plates, and the structure is complex. Although the polarization controller with the super-surface structure has excellent characteristics of miniaturization and real-time response, the limitation is obvious: firstly, the periodic structure of wavelength scale has sensitivity to wavelength, and applicable incident light frequency is limited; secondly, the super-surface structure is complex in design and high in processing cost, and the introduction of processing errors can influence the polarization control effect of the super-surface structure.
Disclosure of Invention
The embodiment of the invention provides a polarization control device and a polarization control method, which can solve the problems of complex structure, limited frequency width and incapability of real-time generation and regulation of any polarization state of the existing scalar beam polarization controller.
According to an aspect of the present invention, there is provided a polarization control apparatus including a polarization modulation unit and a nonlinear medium crystal sequentially arranged along an optical path common axis;
the polarization modulation unit is used for modulating incident light into linearly polarized light with a preset polarization direction;
the nonlinear medium crystal is used for regulating and controlling the refractive index difference of the linearly polarized light under the action of an external field so as to output scalar light beams in a required polarization state.
Optionally, the polarization modulation unit includes a linear polarizer and a rotation unit, and the rotation unit is configured to drive the linear polarizer to rotate around the optical axis.
Optionally, the angular accuracy of the rotation of the required rotation unit is adjustable.
Optionally, the external field comprises at least one of an electric field, a magnetic field, a stress field, or a temperature field.
Optionally, the external field comprises an electric field and the nonlinear dielectric crystal comprises an electro-optic crystal.
Optionally, the electro-optic crystal comprises a lithium niobate-type crystal comprising a first surface and a second surface arranged oppositely and in parallel, the first surface being provided with a first electrode and the second surface being provided with a second electrode.
Alternatively, the crystal optical axis of the lithium niobate-type crystal is perpendicular to the direction of the incident light, and the normal direction of the first surface is parallel to the crystal optical axis.
Optionally, the incident light comprises natural light and the desired polarization state comprises a linear polarization state, a circular polarization state, or an elliptical polarization state.
According to another aspect of the present invention, there is provided a polarization control method for a polarization control apparatus according to an embodiment of the above aspect, the polarization control method including:
adjusting a polarization modulation unit to enable incident light to be transmitted into linearly polarized light in a preset polarization direction through the polarization modulation unit;
and modulating an external field where the nonlinear medium crystal is positioned to regulate and control the refractive index difference of the linearly polarized light and output a scalar light beam in a required polarization state.
Optionally, the incident light comprises natural light, and the desired polarization state comprises a linear polarization state, a circular polarization state, or an elliptical polarization state.
The embodiment of the invention provides a polarization control device and a polarization control method, wherein the polarization control device comprises a polarization modulation unit and a nonlinear medium crystal which are sequentially arranged along a light path common-optical axis; modulating incident light into linearly polarized light with a preset polarization direction through a polarization modulation unit; and then the refractive index difference of the linearly polarized light is regulated and controlled by the nonlinear medium crystal under the action of an external field so as to output scalar light beams in the required polarization state. The embodiment of the invention can realize the real-time generation of any polarization distribution of the scalar light beam, including linearly polarized light, circularly polarized light and elliptically polarized light, has simple and efficient structure, has the capability of real-time adjustment and control of the polarization state of the scalar light beam, and realizes the high stability and high-quality output of the polarization state of the light beam.
It should be understood that the statements in this section are not intended to identify key or critical features of the embodiments of the present invention, nor are they intended to limit the scope of the invention. Other features of the present invention will become apparent from the following description.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a polarization control apparatus according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a polarizer provided in an embodiment of the present invention;
fig. 3 is a schematic flowchart of a polarization control method according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a schematic structural diagram of a polarization control apparatus according to an embodiment of the present invention, and referring to fig. 1, the polarization control apparatus includes a polarization modulation unit 11 and a nonlinear medium crystal 12, which are sequentially disposed along a common optical axis of an optical path. The polarization modulation unit 11 is configured to modulate incident light into linearly polarized light with a preset polarization direction. The nonlinear medium crystal 12 is used for regulating and controlling the refractive index difference of linearly polarized light under the action of an external field so as to output a scalar light beam in a required polarization state.
The incident light firstly passes through the polarization modulation unit 11 and then passes through the nonlinear medium crystal 12 along the propagation direction of the light path in the polarization control device, the optical axes of the polarization modulation unit 11 and the nonlinear medium crystal 12 are both located on the same straight line, and the two are in a coaxial-axis relationship, so that the structure is easy to adjust the optical element. The polarization modulation unit 11 can convert an input light beam into linearly polarized light oscillating in a fixed direction, the nonlinear medium crystal 12 can regulate and control the refractive index difference of the polarized light entering the crystal, and the polarization modulation unit 11 is matched with the nonlinear medium crystal 12 to realize the output of a scalar light beam in a required polarization state.
Referring to fig. 1, the direction of the optical axis is the z-axis direction, the vertical direction of the plane is the y-axis direction, and the direction of the x-axis is perpendicular to the paper surface.
The embodiment of the invention provides a polarization control device, which adjusts the polarization state of a light beam through a polarization modulation unit 11, adjusts the phase difference values of light beams propagating in different polarization directions in a crystal under the action of an external field by matching with a nonlinear medium crystal 12, realizes the real-time generation of any polarization distribution of scalar light beams, including linearly polarized light, circularly polarized light and elliptically polarized light, has a simple and efficient structure, has the capacity of adjusting and controlling the polarization state of the scalar light beams in real time, and realizes the high stability and high-quality output of the polarization state of the light beams.
Alternatively, the polarization modulation unit 11 includes a linear polarizer and a rotation unit for driving the linear polarizer to rotate around the optical axis.
The linear polarizer can change an incident light beam into linearly polarized light, when the position of the linear polarizer is fixed, the incident light beam passes through the linear polarizer to obtain the linearly polarized light with a fixed angle, fig. 2 is a structural schematic diagram of the polarizer provided by the embodiment of the invention, referring to fig. 2, the linear polarizer is in a fixed position, and a direction 111 of the linearly polarized light generated by passing through the linear polarizer is a linear direction with an included angle of 45 degrees with a positive direction of an x axis and an included angle of 45 degrees with a positive direction of a y axis. In practical implementation, the linearly polarized light with the preset polarization state can be provided for the nonlinear dielectric crystal 12 by driving the linearly polarized light plate to rotate around the optical axis through the rotating unit.
Optionally, the angular accuracy of the rotation of the required rotation unit is adjustable.
The linear polaroid is placed on the rotating unit, the rotating unit can drive the linear polaroid to rotate around an optical axis, the rotating angle precision of the rotating unit is adjustable, the rotating angle range of the linear polaroid is 0-360 degrees, and the rotating unit can accurately complete adjustment on any angle. Illustratively, with continued reference to FIG. 2, the rotation unit rotates the angle between the linear polarizer and the optical axis to exactly 45 degrees, depending on the output requirement for a scalar beam of the desired polarization state. The rotation unit can adjust the angle of the linear polarizer to be proper according to the output requirement of the scalar light beam with the needed polarization state.
Optionally, the external field comprises at least one of an electric field, a magnetic field, a stress field, or a temperature field.
Wherein, various external fields, such as electric field, magnetic field, stress field and temperature field, all affect the optical properties of the nonlinear medium crystal 12, and some interaction effects occur, such as electro-optic effect, magneto-optic effect, piezoelectric effect, elastic-optic (or calendaring) effect, thermo-optic effect, etc.
In one embodiment, optionally, the external field comprises an electric field and the nonlinear dielectric crystal 12 comprises an electro-optic crystal.
The electro-optic effect of the nonlinear dielectric crystal 12 is caused by nonlinear polarization of the medium caused by an electric field when light propagates in the medium, and the refractive index of the nonlinear dielectric crystal 12 changes with the change of the applied electric field. The electro-optical crystal has good performances of large electro-optical coefficient, large refractive index, good optical uniformity, high light transmittance, small dielectric loss, high voltage resistance, strong light damage resistance and the like, and can obtain better regulation and control effect in the polarization control technology.
Optionally, the electro-optic crystal comprises a lithium niobate-type crystal comprising a first surface and a second surface arranged oppositely and in parallel, the first surface being provided with the first electrode and the second surface being provided with the second electrode.
The lithium niobate crystal can be used for nonlinear application, can be used in the electro-optic effect occasion, and has good nonlinear, electro-optic and piezoelectric properties. The lithium niobate crystal is in a hexahedral structure, the two corresponding surfaces in parallel of the lithium niobate crystal are respectively provided with a plated electrode, and voltage is applied to the lithium niobate crystal plated with the electrode surface, so that an electric field is formed between the two electrodes.
Alternatively, the crystal optical axis of the lithium niobate-type crystal is perpendicular to the direction of incident light, and the normal direction of the first surface is parallel to the crystal optical axis.
The optical axis of the crystal of the lithium niobate type crystal is vertical to the direction of incident light, the first surface and the second surface which are parallel to each other are respectively plated with electrodes, and the normal direction of the first surface is parallel to the optical axis of the crystal. Under the action of an external electric field, the lithium niobate crystal can change the refractive index difference values of different polarization directions in the crystal, so that the phase difference values of light transmitted in different polarization directions in the crystal are changed, and further, the required polarization state can be output at the output surface of the lithium niobate electro-optic crystal.
Alternatively, the incident light comprises natural light and the desired polarization state comprises a linear polarization state, a circular polarization state, or an elliptical polarization state.
The natural light refers to the characteristic that the light vector has axial symmetry, uniform distribution and the same vibration amplitude in all directions. Polarized light means that the vibration direction of the light vector is unchanged or has a certain regular change. According to the property distinction, the polarized light can be divided into linearly polarized light, circularly polarized light or elliptically polarized light. If the vibration direction of the light wave electric vector is limited in one plane, and the tail end track of the electric vector is a straight line in the transmission process, the light wave electric vector is called linearly polarized light; if the light wave electric vector varies regularly with time, the trajectory of the end of the electric vector is circular or elliptical in a plane perpendicular to the propagation direction, and is called circularly polarized light or elliptically polarized light.
Fig. 3 is a schematic flowchart of a polarization control method according to an embodiment of the present invention, which can be implemented based on the polarization control apparatus according to any of the above embodiments. Referring to fig. 3, the polarization control method includes the steps of:
and S110, adjusting the polarization modulation unit to enable the incident light to be transmitted into linearly polarized light in a preset polarization direction through the polarization modulation unit.
During the concrete implementation, the polarization modulation unit can include linear polarization piece and rotation unit, and the linear polarization piece is placed on rotation unit, and rotation unit can drive the linear polarization piece and rotate around the optical axis, and the rotatory angular accuracy of rotation unit is adjustable, can change the light beam of inputing into the linear polarization of fixed direction oscillation, through the rotation angle of adjusting rotation unit, drives the rotation of linear polarization piece, and then obtains the scalar beam of required polarization state.
Alternatively, the incident light comprises natural light and the desired polarization state comprises a linear polarization state, a circular polarization state, or an elliptical polarization state.
The natural light refers to the characteristic that the light vector has axial symmetry, uniform distribution and the same vibration amplitude in all directions. Polarized light means that the vibration direction of the light vector is unchanged or has a certain regular change. According to the property distinction, the polarized light can be divided into linearly polarized light, circularly polarized light or elliptically polarized light. If the vibration direction of the optical wave electric vector is limited in one plane, and the tail end track of the electric vector is a straight line in the transmission process, the tail end track is called linearly polarized light; if the light wave electric vector varies regularly with time, the trajectory of the end of the electric vector is circular or elliptical in a plane perpendicular to the propagation direction, and is called circularly polarized light or elliptically polarized light.
And S120, modulating an external field where the nonlinear medium crystal is located to regulate and control the refractive index difference of the linearly polarized light and output a scalar light beam in a required polarization state.
Wherein the external field can be at least one of an electric field, a magnetic field, a stress field, a temperature field and the like, and in a certain embodiment, the nonlinear medium crystal comprises an electro-optic crystal, and the electro-optic crystal comprises a lithium niobate type crystal. The optical axis direction of the lithium niobate type crystal is perpendicular to the direction of incident light, and the two surfaces plated with the electrodes are parallel to each other and parallel to the direction of the optical axis of the crystal. The lithium niobate crystal plated with the electrode surface is applied with voltage, and under the action of an external electric field, the lithium niobate crystal can change the refractive index difference values of different polarization directions in the crystal, so that the phase difference values of light transmitted in different polarization directions in the crystal are changed. Furthermore, the polarization regulating unit is matched with the nonlinear medium crystal, and the polarization state required by output of the output surface of the lithium niobate type electro-optical crystal can be realized.
The embodiment of the invention provides a polarization control method, which comprises the steps of firstly adjusting a polarization modulation unit to enable incident light to be transmitted as linearly polarized light in a preset polarization direction through the polarization modulation unit, and then modulating an external field where a nonlinear medium crystal is located to regulate and control the refractive index difference value of the linearly polarized light and output scalar light beams in a required polarization state. The embodiment of the invention can realize the generation of any polarization state of the scalar light beam, can realize the real-time generation and control of the polarization state of the light beam, has the capability of real-time control, and can realize the high stability and high-quality output of the polarization state of the light beam.
The above-described embodiments should not be construed as limiting the scope of the invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A polarization control device is characterized by comprising a polarization modulation unit and a nonlinear medium crystal which are sequentially arranged along a light path common optical axis;
the polarization modulation unit is used for modulating incident light into linearly polarized light with a preset polarization direction;
the nonlinear medium crystal is used for regulating and controlling the refractive index difference of the linearly polarized light under the action of an external field so as to output scalar light beams in a required polarization state.
2. The polarization control apparatus of claim 1, wherein the polarization modulation unit comprises a linear polarizer and a rotation unit, and the rotation unit is configured to rotate the linear polarizer around the optical axis.
3. The polarization control apparatus of claim 2, wherein the angular accuracy of the rotation unit required is adjustable.
4. The polarization control device of claim 1, wherein the external field comprises at least one of an electric field, a magnetic field, a stress field, or a temperature field.
5. The polarization control device of claim 4, wherein said external field comprises an electric field and said nonlinear dielectric crystal comprises an electro-optic crystal.
6. The polarization control device of claim 5, wherein the electro-optic crystal comprises a lithium niobate-type crystal comprising a first surface and a second surface disposed opposite and parallel, the first surface being provided with a first electrode and the second surface being provided with a second electrode.
7. The polarization control device according to claim 6, wherein a crystal optical axis of the lithium niobate-type crystal is perpendicular to the direction of the incident light, and a normal direction of the first surface is parallel to the crystal optical axis.
8. The polarization control device of claim 1, wherein the incident light comprises natural light and the desired polarization state comprises a linear polarization state, a circular polarization state, or an elliptical polarization state.
9. A polarization control method applied to the polarization control device according to any one of claims 1 to 8, the polarization control method comprising:
adjusting a polarization modulation unit to enable incident light to be transmitted into linearly polarized light in a preset polarization direction through the polarization modulation unit;
and modulating an external field where the nonlinear medium crystal is positioned to regulate and control the refractive index difference of the linearly polarized light and output a scalar light beam in a required polarization state.
10. The polarization control method of claim 9, wherein the incident light comprises natural light and the desired polarization state comprises a linear polarization state, a circular polarization state, or an elliptical polarization state.
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| CN103267576A (en) * | 2013-05-14 | 2013-08-28 | 西安工业大学 | Device and method for light wave polarization state high-speed static measurement |
| CN104536164A (en) * | 2014-09-28 | 2015-04-22 | 广东工业大学 | Magneto-optical effect based vector polarization light beam modulation system and method |
| CN105785580A (en) * | 2016-04-15 | 2016-07-20 | 中国科学院上海技术物理研究所 | Linearly polarized light generation device with controllable polarization direction and constant light intensity |
| CN107132673A (en) * | 2017-07-19 | 2017-09-05 | 中国工程物理研究院激光聚变研究中心 | A kind of device for eliminating electro-optic crystal depolarization |
| CN109975998A (en) * | 2019-02-02 | 2019-07-05 | 中国科学院国家授时中心 | Electric light Polarization Modulation system and electric light polarization modulation method |
| CN114362822A (en) * | 2021-12-08 | 2022-04-15 | 中国人民解放军战略支援部队信息工程大学 | Based on LiNbO3Natural light communication method of volume modulator |
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