Phase plate group, optical antenna, and processing method and apparatus for phase plate group

Abstract

A phase plate group, an optical antenna, and a processing method and apparatus for a phase plate group, which are used for improving link stability. The phase plate group comprises N phase plates (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12), wherein N≥2. Each of the N phase plates (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) is unevenly etched in both a radius (ρ) direction and an azimuth angle (ψ) direction, and the uneven etching corresponds to the phase distribution required by N expected structural beams, and preset rotational angles (ψ01) of the N phase plates (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12). The first phase plate (1, 5, 9) is configured to reflect or transmit input light of the phase plate group, and perform phase modulation on the input light. The i-th phase plate (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12) is configured to reflect or transmit output light of the previous phase plate (1, 2, 3, 5, 6, 7, 9, 10, 11), and perform phase modulation on the output light, wherein 2≤i≤N. The phase plate group is configured to perform beam switching by means of rotating the N phase plates (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12).

Description

A phase plate group, a light antenna, a processing method and equipment of the phase plate group

[0001] The present application claims priority from the Chinese patent application No. 202410891788.3 filed on July 2, 2024 with the State Intellectual Property Office, and entitled "A phase plate group, a light antenna, a processing method and equipment of the phase plate group", the content of which is incorporated herein in its entirety. TECHNICAL FIELD

[0002] The present application relates to the wireless field, in particular to a phase plate group, a light antenna, a processing method and equipment of the phase plate group. BACKGROUND

[0003] The backhaul network is an important part of the communication network, which refers to the part of the wireless access network connected to the core network. Due to the convergence characteristics of the network, the backhaul network has very high requirements for the capacity and stability of data transmission. According to the different frequency bands of the transmitted electromagnetic waves, the backhaul network can be divided into traditional microwave transmission and wireless optical communication (FSO). In recent years, in wireless optical communication, how to realize the switching of structured light beams has become a problem to be solved.

[0004] In the phase plate group of the related technical scheme, a plurality of different phase plates are placed on the groove positions of the rotating disc, and by rotating the rotating disc, the selected phase plate is aligned with the optical path position, so as to realize the switching of the light beam.

[0005] In this phase plate group, during the rotation of the rotating disc, the rotating disc will cause obstruction to the optical path, resulting in distortion of the light beam and reducing the link stability. SUMMARY

[0006] The present application provides a phase plate group, a light antenna, a processing method and equipment of the phase plate group, which includes N phase plates. Through the continuous reflection and / or transmission of the N phase plates, the output light is obtained, and the optical path is not obstructed, thereby improving the link stability.

[0007] In a first aspect, the present application provides a phase plate set, comprising N phase plates. Each of the N phase plates is non-uniformly etched in the radial direction and the azimuthal direction, that is, each of the N phase plates is non-uniformly etched in a two-dimensional plane, so that a non-uniform phase related to a light beam can be generated in the two-dimensional plane. Alternatively, the phase distribution of each of the N phase plates in the radial direction and the azimuthal direction is non-uniform. Moreover, the non-uniform etching of each of the N phase plates corresponds to the phase distribution required by N desired structured light beams and the preset rotation angle of the N phase plates. Alternatively, each of the N phase plates corresponds to a different desired structured light beam, that is, the N phase plates correspond to N desired structured light beams. Each of the N phase plates can modulate the phase of the light beam. Specifically, the first phase plate of the N phase plates is configured to reflect or transmit the input light of the phase plate set and modulate the phase of the input light. The i-th phase plate of the N phase plates is configured to reflect or transmit the output light of the previous phase plate and modulate the phase of the output light of the previous phase plate. In summary, the phase plate set modulates the phase of the input light through the continuous reflection and / or transmission of the N phase plates. The continuous reflection and / or transmission means that the light beam will continuously pass through the N phase plates when the light beam is transmitted in the phase plate set, that is, each of the N phase plates reflects or transmits the light beam, which means that each of the N phase plates does not block the light path. In addition, the phase plate set is also configured to switch the light beam by rotating the N phase plates. Further, the N phase plates correspond to N desired structured light beams, and the rotation of the phase plates can modulate the phase of the input light and switch the light beam at the same time, so that the output light can be the desired structured light beam. Wherein, N≥2, 2≤i≤N, and N and i are integers.

[0008] In the present application, the phase plate set comprises N phase plates, and the phase of the input light is modulated through the continuous reflection and / or transmission of the N phase plates to obtain the output light, without blocking the light path, thereby improving the link stability. In addition, each of the N phase plates is non-uniformly etched in the radial direction and the azimuthal direction, and the non-uniform etching corresponds to the phase distribution required by N desired structured light beams and the preset rotation angle of the N phase plates. Therefore, the light beam can be switched by rotating the phase plates, which is simple to operate.

[0009] In some optional implementation forms of the first aspect, the non-uniform etching of the first phase plate corresponds to a phase distribution required by the N desired structured light beams and a preset rotation angle of the N phase plates. The phase distribution of the i-th phase plate corresponds to a phase distribution required by the i-th desired structured light beam, a phase distribution required by the first desired structured light beam, and a preset rotation angle of the i-th phase plate, 2≤i≤N, and i is an integer. The preset rotation angle of each phase plate can be the same or different, and can be determined based on actual application requirements, which is not limited here. In addition, the greater the preset rotation angle, the higher the fault tolerance of the phase plate during rotation, and the more accurate the beam switching.

[0010] In the present application, the desired structured light beams and the preset rotation angles corresponding to each phase plate in the phase plate set are different, so that the phase plate set can change the phase modulation of the input light by rotating different phase plates in application, thereby outputting different structured light beams. The present application provides a basis for the realization of beam switching and improves the practicability of the technical solution.

[0011] In some optional implementation forms of the first aspect, the total phase distribution of the phase plate set is the sum of the phase distributions of the N phase plates.

[0012] In the present application, the total phase distribution of the phase plate set is the sum of the phase distributions of each phase plate, which further illustrates that the input light will pass through the N phase plates, and there is no beam blocking, thereby improving the stability of the link.

[0013] In some optional implementation forms of the first aspect, in the initial state, the total phase distribution of the phase plate set is the phase distribution required by the first desired structured light beam in the N desired structured light beams. That is, in the initial state, the output light of the phase plate set is the first desired structured light beam. The initial state means that each phase plate in the N phase plates is located at an initial position and is not rotated.

[0014] In some optional implementation forms of the first aspect, if the rotation angle of the i-th phase plate in the N phase plates is the preset rotation angle of the i-th phase plate, and the other phase plates are all in the initial position, then the total phase distribution of the phase plate set is the phase distribution required by the i-th desired structured light beam in the N desired structured light beams. That is, the output light of the phase plate set is the i-th desired structured light beam at this time.

[0015] In the present application, in the initial state, the output light of the phase plate set is the first desired structured light beam. In the state that the i-th phase plate rotates a preset rotation angle and the other phase plates are in the initial position, the output light of the phase plate set is the i-th desired structured light beam. Since 2≤i≤N, the switching of N desired structured light beams is realized. Further, in switching the structured light beam, only the phase plate corresponding to a desired structured light beam is rotated to a preset rotation angle, and the other phase plates are in the initial position, and the output light obtained is the desired structured light beam, which is simple to operate and further enhances the practicality of the technical scheme of the present application.

[0016] In some optional implementations of the first aspect, if the rotation angle of the i-th phase plate in the N phase plates is less than the preset rotation angle of the i-th phase plate, and the other phase plates are in the initial state, then the total phase distribution of the phase plate set at this time is a linear combination of the phase distribution required by the i-th desired structured light beam and the phase distribution required by the first desired structured light beam. That is, the output light of the phase plate at this time is linearly related to the i-th desired structured light beam and the first desired structured light beam.

[0017] In the present application, in the scheme that the rotation angle of the i-th phase plate is less than the corresponding preset rotation angle and the other phase plates are in the initial state, the output light beam of the phase plate set is linearly related to the i-th desired structured light beam and the first desired structured light beam, and no distortion light beam is introduced. That is, during the process of rotating the i-th phase plate to the corresponding preset rotation angle, no distortion light beam is introduced, which further improves the link stability.

[0018] In some optional implementations of the first aspect, if the first phase plate in the N phase plates is in the initial state and the rotation angles of the X phase plates are all less than the respective preset rotation angles, then the total phase distribution of the phase plate set is a linear combination of the phase distributions required by the first desired structured light beam corresponding to the first phase plate and the X+1 desired structured light beams corresponding to the X phase plates. That is, the total phase distribution is linearly related to the phase distribution required by the first desired structured light beam corresponding to the first phase plate and the phase distributions required by the X desired structured light beams corresponding to the X phase plates. That is, the output light of the phase plate at this time is linearly related to the X+1 desired structured light beams. Wherein, 2≤X≤N-1, and X is an integer. That is, the application scenario of the present implementation is that multiple phase plates in the N phase plates are rotated.

[0019] In the application, in the scheme in which the rotation angle of the plurality of phase plates in the N phase plates is less than the preset rotation angle and the other phase plates are in the initial state, the light beam output by the phase plate group is linearly related to the plurality of expected structured light beams corresponding to the plurality of phase plates and the first expected structured light beam, and no distortion light beam is introduced. That is, in the scheme of rotating the plurality of phase plates, no distortion light beam is introduced, and the link stability is further improved.

[0020] In some optional implementations of the first aspect, the N phase plates are all transmissive mirrors, and the geometric centers of the N phase plates are directly opposite.

[0021] In the application, the geometric centers of the N phase plates can be directly opposite, which reduces the volume of the phase plate group and realizes the small size of the phase plate group. At the same time, each phase plate is a transmissive mirror, which also reduces the generation cost and complexity of the phase plate group, and further improves the practical value of the phase plate group.

[0022] In some optional implementations of the first aspect, the N phase plates can all be reflective mirrors, or the N phase plates include reflective mirrors and transmissive mirrors.

[0023] In the application, the types of the phase plates in the phase plate group have multiple possibilities, which enriches the implementation modes and application scenarios of the technical scheme of the application and further improves the flexibility of the technical scheme of the application.

[0024] Secondly, the application provides an optical antenna, which includes the phase plate group shown in the first aspect or any possible implementation of the first aspect.

[0025] The beneficial effects of the second aspect are similar to those of the first aspect or any possible implementation of the first aspect, which will not be repeated here.

[0026] Thirdly, the application provides a processing method of a phase plate group, which includes:

[0027] The phase distribution required by the N desired structured light beams and preset rotation angles of the N phase plates are acquired. The phase distribution required by the N desired structured light beams can be understood as the phase distribution on the phase plate when the desired structured light beam is generated by the phase plate. Based on the phase distribution required by the N desired structured light beams and the preset rotation angles of the N phase plates, the phase distribution of the N phase plates is determined. Then, the radial direction and the azimuth angle direction of the N phase plates are non-uniformly etched according to the phase distribution of the N phase plates, so as to obtain a phase plate set. Since the radial direction and the azimuth angle direction of each phase plate are non-uniformly etched, the phase distribution on each phase plate is non-uniform in the radial direction and the azimuth angle direction. The first phase plate in the N phase plates is used to modulate the phase of the input light by reflecting or transmitting the input light of the phase plate set; the i th phase plate in the N phase plates is used to modulate the phase of the output light of the previous phase plate by reflecting or transmitting the output light of the previous phase plate, 2≤i≤N, and i is an integer. That is, the phase plate set modulates the phase of the input light by continuously reflecting and / or transmitting the N phase plates. The phase plate set is also used to switch the light beams by rotating the N phase plates.

[0028] In the present application, the radial direction and the azimuth angle direction of each phase plate are non-uniformly etched based on the phase distribution of each phase plate, so that the phase of each phase plate in the radial direction and the azimuth angle direction is non-uniformly distributed. Since the phase distribution of the phase plate is determined based on the phase distribution required by the N desired structured light beams and the preset rotation angles of the N phase plates, the light beams can be switched by rotating the phase plate, so that the output light of the phase plate set includes the desired structured light beams, and the operation of the light beam switching is simple. In addition, the N phase plates are included in the phase plate set, and the phase of the input light is modulated by continuously reflecting and / or transmitting the N phase plates to obtain the output light, without blocking the light path, thereby improving the link stability.

[0029] In an optional implementation of the third aspect, determining the phase distribution of the N phase plates based on the phase distribution required by the N desired structured light beams and the preset rotation angles of the N phase plates comprises: determining the phase distribution of the first phase plate in the N phase plates based on the phase distribution required by the N desired structured light beams and the preset rotation angles of the N phase plates. The phase distribution of the i th phase plate in the N phase plates is determined based on the phase distribution required by the i th desired structured light beam, the phase distribution required by the first desired structured light beam, and the preset rotation angle of the i th phase plate, 2≤i≤N, and i is an integer.

[0030] In the present application, the expected structured light beams corresponding to each phase plate in the phase plate set and the preset rotation angles are different, so that the phase plate set can change the phase modulation of the input light by rotating different phase plates in application, thereby outputting different structured light beams. The implementation of beam switching is provided, and the practicability of the technical scheme of the present application is improved.

[0031] The phase plate set processed based on the third aspect of the present application is similar to the first aspect or any one of the possible implementation manners of the first aspect, which will not be repeated here.

[0032] In a fourth aspect, the present application provides a processing device of a phase plate, comprising:

[0033] The acquisition unit is configured to acquire the phase distribution required by the N expected structured light beams and the preset rotation angles of the N phase plates, where N≥2.

[0034] The processing unit is configured to determine the phase distribution of the N phase plates according to the phase distribution required by the N expected structured light beams and the preset rotation angles of the N phase plates. The radius direction and the azimuth angle direction of the N phase plates are both non-uniformly etched according to the phase distribution of the N phase plates, so as to obtain the phase plate set.

[0035] The phase plate set processed based on the fourth aspect of the present application is similar to the first aspect or any one of the possible implementation manners of the first aspect, which will not be repeated here.

[0036] In a fifth aspect, the present application provides a processing device of a phase plate, comprising a processor and a memory. The processor stores instructions. When the instructions stored in the memory are executed on the processor, the method shown in the third aspect or any one of the possible implementation manners of the third aspect is implemented.

[0037] In a sixth aspect, the present application provides a computer readable storage medium. The computer readable storage medium stores instructions. When the instructions are executed on the processor, the method shown in the third aspect or any one of the possible implementation manners of the third aspect is implemented.

[0038] In a seventh aspect, the present application provides a computer program product. When the computer program product is executed on the processor, the method shown in the third aspect or any one of the possible implementation manners of the third aspect is implemented.

[0039] The beneficial effects shown in any one of the fifth aspect to the seventh aspect are similar to the third aspect or any one of the possible implementation manners of the third aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0040] FIG. 1 is a structural schematic diagram of a phase plate set in a related technical scheme;

[0041] FIG. 2 is a structural schematic diagram of a phase plate set according to an embodiment of the present application;

[0042] FIG. 3 is another structural schematic diagram of a phase plate set according to an embodiment of the present application;

[0043] FIG. 4 is another structural schematic diagram of a phase plate set according to an embodiment of the present application;

[0044] FIG. 5 is a schematic diagram of input light according to an embodiment of the present application;

[0045] FIG. 6 is a schematic diagram of a desired structured light beam according to an embodiment of the present application;

[0046] FIG. 7 is another schematic diagram of a desired structured light beam according to an embodiment of the present application;

[0047] FIG. 8 is a schematic diagram of a phase distribution according to an embodiment of the present application;

[0048] FIG. 9 is a flowchart of a processing method of a phase plate set according to an embodiment of the present application;

[0049] FIG. 10 is a structural schematic diagram of a processing device of a phase plate set according to an embodiment of the present application. DETAILED DESCRIPTION

[0050] The present application provides a phase plate set, a light antenna, a processing method and a device of the phase plate set. The phase plate set includes N phase plates. The output light is obtained through continuous reflection and / or transmission of the N phase plates, and the light path is not blocked, thereby improving the link stability.

[0051] The embodiments of the present application are described below with reference to the accompanying drawings. It is known to those skilled in the art that, with the development of technology and the appearance of new scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0052] The terms "first", "second", and the like in the description and in the claims of the present application and above-described drawings are used to distinguish similar objects and are not necessarily used to describe a specific sequential or chronological order. It should be understood that the terms so used are interchangeable under appropriate circumstances and are merely employed to distinguish one embodiment of the application from another. Furthermore, the terms "comprise", "have", and any variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, system, product, or apparatus that comprises a list of elements is not necessarily limited to those elements, but can include other elements not expressly listed or inherent to such process, method, system, product, or apparatus. Additionally, "at least one" means one or more, and "multiple" means two or more. The term "and / or" describes an association between associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which means that A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents an "or" relationship between the associated objects. "At least one of the following" or similar expressions means any combination of the items, including single or multiple combinations. For example, at least one of a, b, or c means a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be singular or plural.

[0053] First, the related concepts and special terms that may be involved in the present application are described.

[0054] 1) Backhaul network:

[0055] The backhaul network refers to the part of the wireless access network connected to the core network, which is an important part of the communication network. This part of the network has a convergence feature and has very high requirements for the capacity and stability of data transmission. The main transmission channel of the backhaul network is a long-distance fixed point-to-point line-of-sight transmission channel.

[0056] 2) Wireless optical communication (free-space optical communication, FSO):

[0057] Wireless optical communication is a type of wireless backhaul network, which works at a higher electromagnetic wave frequency band than traditional microwave transmission, and has the advantage of large transmission capacity. In traditional FSO communication equipment, the optical antenna has the energy to emit different types of structured light beams, and has the function of light beam switching. Structured light beam switching is achieved by switching between different phase modulations.

[0058] 3) Phase of light:

[0059] The phase of light refers to the alternating waveform change of photon vibration when the light wave advances, which can reflect the offset of the starting position of the light wave relative to a reference point. Phase modulation of light is to realize modulation and transmission of information by changing the phase of light. Or, phase modulation of light waves can produce a variety of different spectra and optical properties, thereby realizing switching of light beams.

[0060] Next, refer to FIG. 1, which is a structural schematic diagram of a phase plate set provided by the related technical solution.

[0061] As shown in FIG. 1, the phase plate set presents the shape of a turntable, and 6 phase plates are placed on the slots of the turntable. The thicknesses of the phase plates are different, so that different phase plates have different phase modulation results on input light. In application, the turntable is rotated to switch the phase plate through which the input light passes. Or, the selected phase plate is rotated to the position of the light path, thereby realizing switching of the light beam. In addition, in the phase plate set shown in FIG. 1, only the position of the phase plate can transmit the input light, and other positions on the turntable will block the input light.

[0062] For such a phase plate set, in the process of rotating the turntable to switch the light beam, the positions on the turntable where no phase plate is placed will block the input light, causing distortion of the light beam and reducing the stability of the link. The phase plate set provided by the present application is used to solve this problem. Next, the phase plate set provided by the present application is described.

[0063] The phase plate set provided by the embodiments of the present application includes N phase plates, each of which is non-uniformly etched in the radial direction and the azimuthal direction, and the non-uniform etching corresponds to the phase distribution required by N expected structured light beams and the preset rotation angle of the N phase plates. Non-uniform etching in the radial direction and the azimuthal direction means that the phase distribution in the radial direction and the azimuthal direction is non-uniform. That is, each phase plate is non-uniformly etched in a two-dimensional plane.

[0064] In addition, the non-uniform etching of each phase plate corresponds to the phase distribution required by N expected structured light beams and the preset rotation angle of the N phase plates, which means that the N phase plates correspond to N expected structured light beams, and the N expected structured light beams are different light beams.

[0065] The preset rotation angle of the phase plate refers to the rotation angle of the phase plate, which can be understood as the maximum rotation angle of the phase plate in the process of switching the light beam, or the phase plate can rotate in the range of 0 to the preset rotation angle in the process of switching the light beam. The preset rotation angle has a value range of [0, π].

[0066] In the embodiments of the present application, the preset rotation angles of the phase plates are not limited, and can be all the same, all different, or partially the same, which is determined based on actual application needs, and is not limited here. In addition, the greater the preset rotation angle, the higher the fault tolerance rate of the phase plate during rotation, and the more accurate the beam switching.

[0067] Optionally, the preset rotation angle can be set as π or π / 2. When the preset rotation angle is π, since 0 to 2π is a period, and the results of the clockwise rotation A and the counterclockwise rotation A of the phase plate are symmetrical, it means that π is the maximum rotation angle. Therefore, setting the preset rotation angle as π can achieve the optimal adjustment granularity and realize precise adjustment.

[0068] Each phase plate in the phase plate group is used to reflect or transmit the light beam and perform phase adjustment on the light beam based on the non-uniform etching of the phase plate. Specifically, the first phase plate in the N phase plates is used to reflect or transmit the input light of the phase plate group and perform phase modulation on the input light. The i-th phase plate in the N phase plates is used to reflect or transmit the output light of the previous phase plate and perform phase modulation on the output light of the previous phase plate, where 2≤i≤N. In summary, each phase plate in the phase plate group plays a role in phase modulation of the light beam during the transmission of the light beam. It can also be understood that the phase plate group performs phase modulation on the input light through the continuous reflection and / or transmission of the N phase plates to obtain the output light.

[0069] It should be noted that the continuous reflection and / or transmission of the N phase plates here means that the input light of the phase plate group continuously passes through the N phase plates in the phase plate group, and each phase plate reflects or transmits the light beam. Therefore, each phase plate participates in the transmission of the light beam and does not block the optical path.

[0070] In addition, the phase plate group also has the function of beam switching, which is realized by rotating the N phase plates. Rotating the phase plate here means rotating the phase plate in a two-dimensional plane, and the rotation process does not block the optical path. Since the N phase plates correspond to the N expected structured light beams as described above, phase modulation on the input light by rotating the phase plate can also realize beam switching, so that the output light of the phase plate group includes the expected structured light beam.

[0071] In the embodiment of the present application, the phase plate group includes N phase plates, and the phase modulation of the input light is realized through the continuous reflection and / or transmission of the N phase plates, and the output light is obtained, and the optical path is not blocked, and the link stability is improved. In addition, each phase plate is non-uniformly etched in the radial direction and the azimuthal direction, and the non-uniform etching corresponds to the phase distribution required by the N desired structured light beams and the preset rotation angle of the N phase plates, so that the beam switching can be realized by rotating the phase plate, and the operation is simple.

[0072] In the embodiment of the present application, the number of phase plates included in the phase plate group has multiple possibilities, and a single phase plate can also be a transmission mirror or a reflection mirror. In order to illustrate concisely, the structure of the phase plate group is described below by taking the phase plate group including four phase plates as an example.

[0073] Please refer to FIGS. 2 to 4, which are structural schematic diagrams of the phase plate group provided by the present application. First, based on FIGS. 2 to 4, the transmission path of the optical path in the phase plate group is described.

[0074] In the embodiment shown in FIG. 2, the phase plate group includes four phase plates, and the four phase plates are all transmission mirrors. The phase plate group with this structure can be called a full-transmission type phase plate group, in which the geometric centers of each phase plate are opposite, that is, the geometric centers of the phase plates are on a straight line. When the light beam is transmitted in the phase plate with this structure, it will only be transmitted. As shown in FIG. 2, the input light is transmitted through the phase plate 1 to the phase plate 4 in turn, and the phase plate 1 performs phase modulation on the input light, and the phase plates 2 to 4 perform phase modulation on the output light of the previous phase plate, and finally the output light is obtained. The phase distribution of the output light is different from that of the input light, and the output light of the phase plate 4 is the output light of the phase plate group.

[0075] In the embodiment shown in FIG. 3, the phase plate group includes four phase plates, the phase plate 5 and the phase plate 8 are reflection mirrors, and the phase plate 6 and the phase plate 7 are transmission mirrors. The phase plate group with this structure can be called a transmission and reflection combined type phase plate group. When the light beam is transmitted in the phase plate group with this structure, it will be transmitted and reflected. As shown in FIG. 3, the input light is reflected by the phase plate 5, reaches the phase plate 6, is transmitted by the phase plate 6 and the phase plate 7, and is finally output after being reflected by the phase plate 8. The phase plate 5 performs phase modulation on the input light, and the phase plates 6 to 8 perform phase modulation on the output light of the previous phase plate in turn, and finally the output light is obtained. The phase distribution of the output light is different from that of the input light, and the output light of the phase plate 8 is the output light of the phase plate group.

[0076] Optionally, for the phase plate set in combination of transmission and reflection, the mirror can be used as the first or the last phase plate of the phase plate set. This is because, when the mirror reflects the light beam, the transmission path of the light beam is changed, and then the space required for the transmission of the light beam is increased. Using the mirror as the first or the last phase plate can reduce the increase of the overall size of the phase plate set caused by the change of the transmission path of the light beam, and is beneficial to realize the miniaturization of the phase plate set.

[0077] In the embodiment shown in FIG. 4, the phase plate set includes four phase plates, and all the four phase plates are mirrors. Such a structure of the phase plate set can be referred to as a full reflection type phase plate set. When the light beam is transmitted in the phase plate set of such a structure, the light beam is only reflected. As shown in FIG. 5, the input light is transmitted through the phase plates 9 to 12 in sequence, and the phase plate 9 performs phase modulation on the input light, and the phase plates 10 to 12 perform phase modulation on the output light of the previous phase plate, and finally the output light is obtained. The phase distribution of the output light is different from the phase distribution of the input light, and the output light of the phase plate 12 is the output light of the phase plate set.

[0078] It should be noted that the embodiments of the present application do not limit the implementation of each phase plate in the phase plate set: if the phase plate is a transmission mirror, it can be an optical lens, a transmission type metamaterial array, a transmission type spatial light modulator or other forms for transmitting the light beam, which are not limited here. If the phase plate is a mirror, it can be a coated optical mirror, a metal mirror, a reflection type metamaterial array, a reflection type spatial light modulator or other forms for reflecting the light beam, which are not limited here.

[0079] It should be further noted that the embodiments of the present application also do not limit the shape and size of each phase plate. The shape or size of each phase plate in the phase plate set can be the same or different, which is not limited here. For example, each phase plate can be a circular shape with the same size in a two-dimensional plane as shown in FIGS. 2 to 4. Optionally, each phase plate can also have different shapes in a two-dimensional plane, such as an ellipse, a triangle, a rectangle or other polygons, which are not limited here.

[0080] Based on the foregoing examples, in the embodiments of the present application, each phase plate in the phase plate set participates in the transmission of the light path, and is used for reflecting or transmitting the light beam, and will not cause occlusion to the light beam. For the full-lens phase plate set, since each phase plate is used for transmitting the light beam, and the geometric centers of each phase plate are on a straight line, the transmission direction of the light beam will not be changed, the space required in the process of light beam transmission is reduced, and the miniaturization of the device is realized. At the same time, the full-lens phase plate set has a simple structure, reduces the system complexity and production cost, and improves the practicability of the phase plate set provided in the embodiments of the present application. In addition, in the embodiments of the present application, the types of the phase plates in the phase plate set have multiple possibilities, so that the phase plate set has multiple possibilities of full-transmission type, full-reflection type, and combination of transmission and reflection type, which enriches the implementation modes and application scenarios of the technical scheme of the present application, and further improves the flexibility of the technical scheme of the present application.

[0081] In the embodiments of the present application, the phase plate set can also realize light beam switching by rotating the phase plates. The principle of this part is described below.

[0082] In the foregoing description, it is mentioned that each phase plate in the N phase plates in the phase plate set is non-uniformly etched in the radial direction and the azimuthal direction, and the non-uniform etching of each phase plate corresponds to the phase distribution required by the N expected structured light beams and the preset rotation angle of the N phase plates. Specifically, the non-uniform etching of the first phase plate corresponds to the phase distribution required by the N expected structured light beams, the preset rotation angle of the N phase plates, and the non-uniform etching of the i-th phase plate corresponds to the phase distribution required by the i-th expected structured light beam, the phase distribution required by the first expected structured light beam, and the preset rotation angle of the i-th phase plate.

[0083] Since the etching of the phase plate is determined according to the phase distribution of the phase plate, it is explained that the phase distribution of the first phase plate is determined according to the phase distribution required by the N expected structured light beams and the preset rotation angle of the N phase plates. The phase distribution of the i-th phase plate is determined according to the phase distribution required by the i-th expected structured light beam, the phase distribution required by the first expected structured light beam, and the preset rotation angle of the i-th phase plate.

[0084] For example, for the full-transmission type phase plate set, and the preset rotation angle of the first phase plate is 0. In this example, the phase distribution of the first phase plate satisfies:

[0085] The phase distribution of the i-th phase plate satisfies:

[0086] Wherein, ρ is the radius of the phase plate, ​​a direction angle of the phase plate, a preset rotation angle of the i-th phase plate, a phase distribution required by the first desired structured light beam, a phase distribution required by the i-th desired structured light beam, 2≤i≤N.

[0087] Optionally, assuming that the preset rotation angles of the second to N-th phase plates are the same based on the foregoing example, and are all the phase distribution of the first phase plate satisfies:

[0088] Based on the foregoing expressions, it is not difficult to see that each phase plate in the phase plate set needs to be etched in two dimensions along the radial direction and the azimuthal direction, and the etching depths in the radial direction and the azimuthal direction satisfy the non-uniform phase distribution. Overall, the desired structured light beams corresponding to the respective phase plates in the phase plate set are different, so that the phase plate set can change the phase modulation of the input light by rotating different phase plates in application, thereby outputting different structured light beams. This provides a basis for the realization of beam switching and improves the practicality of the technical solution of the present application.

[0089] In the embodiments of the present application, the total phase distribution of the phase plate set is the sum of the phase distributions of the N phase plates. This means that for the light beam input to the phase plate set, each phase plate included in the phase plate set will perform phase modulation on it. It is further explained that the input light will pass through the N phase plates, and there is no beam occlusion, which improves the stability of the link.

[0090] In some optional embodiments, in the initial state, the total phase distribution of the phase plate set is the phase distribution required by the first desired structured light beam in the N desired structured light beams. This means that in the initial state, the output light of the phase plate set is the first desired structured light beam. In the initial state, the total phase distribution satisfies expression four:

[0091] wherein the initial state refers to that each phase plate in the N phase plates is located at an initial position and is not rotated.

[0092] In some optional embodiments, if the rotation angle of the i-th phase plate in the N phase plates is the preset rotation angle of the i-th phase plate, and the other phase plates are all in the initial position, then the total phase distribution is the phase distribution required by the i-th desired structured light beam in the N desired structured light beams. That is, the output light of the phase plate set is the i-th desired structured light beam at this time. In this state, the total phase distribution of the phase plate set satisfies expression five:

[0093] For example, assuming that the preset rotation angle of phase plate 1 is 0, the preset rotation angle of phase plate 2 is π, the preset rotation angle of phase plate 3 is π / 2, and the preset rotation angle of phase plate 4 is π / 3.

[0094] In the initial state, the output light of the phase plate set is the first desired structured light beam. In the state that phase plate 2 rotates π in the counterclockwise direction in the two-dimensional plane and the other phase plates are in the initial position, the output light of the phase plate set is the second desired structured light beam. In the state that phase plate 3 rotates π / 2 in the counterclockwise direction in the two-dimensional plane and the other phase plates are in the initial position, the output light of the phase plate set is the third desired structured light beam. In the state that phase plate 4 rotates π / 3 in the counterclockwise direction in the two-dimensional plane and the other phase plates are in the initial position, the output light of the phase plate set is the fourth desired structured light beam.

[0095] In the initial state, the output light of the phase plate set is the first desired structured light beam. In the state that the i th phase plate rotates the preset rotation angle and the other phase plates are in the initial position, the output light of the phase plate set is the i th desired structured light beam. Since 2≤i≤N, the switching of N desired structured light beams is achieved. In the initial state, the N phase plates correspond to N phase plates, which means that the output light of the phase plate set is one desired structured light beam. When only one phase plate set is rotated to the preset rotation angle, the output light of the phase plate set is also one desired structured light beam. Therefore, when the structured light beam is switched, only the phase plate corresponding to a desired structured light beam needs to be rotated to the preset rotation angle, and the other phase plates are in the initial position. The output light obtained is the desired structured light beam, which is simple to operate and further enhances the practicality of the technical solution.

[0096] In some optional embodiments, if the rotation angle of the i th phase plate in the N phase plates is less than the preset rotation angle of the i th phase plate, and the other phase plates are in the initial state, the total phase distribution of the phase plate set is a linear combination of the phase distribution required by the i th desired structured light beam and the phase distribution required by the first desired structured light beam. This means that the output light of the phase plate is linearly related to the i th desired structured light beam and the first desired structured light beam, and is not a distorted light beam. This means that during the rotation of the i th phase plate to the preset rotation angle, no distorted light beam is introduced, and the stability of the link is not reduced.

[0097] For example, assuming that the preset rotation angle of the first phase plate is 0, the preset rotation angles of the second to N th phase plates are In the process of rotating the i th phase plate to the preset rotation angle by an angle Under these conditions, the total phase distribution of the phase plate group satisfies expression six:

[0098] Where m is a constant with a range of values ​​(0, 1).

[0099] In this embodiment, when the rotation angle of the i-th phase plate is less than the corresponding preset angle and the other phase plates are in their initial state, the beam output by the phase plate group is linearly correlated with the i-th desired structure beam and the first desired structure beam, and no beam distortion is introduced. This means that no beam distortion is introduced during the process of rotating the i-th phase plate to the corresponding preset angle, further improving link stability.

[0100] In some optional implementations, if the first phase plate out of N phase plates is in its initial state, and the rotation angles of the X phase plates are all less than their respective preset rotation angles, then the total phase distribution is a linear combination of the phase distributions required by the first phase plate and the X+1 desired structure beams corresponding to the X phase plates. This means that the output light from the phase plate is linearly related to the phase distributions required by the first phase plate and the X+1 desired structure beams corresponding to the X phase plates, and is not a distorted beam. Where 2 ≤ X ≤ N-1. This also means that rotating multiple phase plates in the phase plate group to their respective preset angles does not introduce distorted beams and does not reduce the stability of the link.

[0101] For example, assume that the preset rotation angle of the first phase plate is 0, and the preset rotation angles of the second to Nth phase plates are all 0. Rotate the 2nd to Nth phase plates by less than a preset angle. Angle Under these conditions, the total phase distribution of the phase plate group satisfies expression seven:

[0102] It is easy to see from Expression 7 that the total phase distribution of the phase plate group is a linear combination of the phase distributions required for the N desired beams. Furthermore, this expression can also represent the set of beams generated by the phase plate group during the rotation of each phase plate, excluding the N desired structural beams. In other words, all beams in this set can be generated by the phase plate group.

[0103] In this embodiment, in a scheme where the rotation angle of multiple phase plates among the N phase plates is less than a preset angle, and the other phase plates are in their initial state, the beam output by the phase plate group is linearly correlated with the multiple desired structure beams corresponding to these multiple phase plates and the first desired structure beam, without introducing beam distortion. In other words, in the scheme of rotating multiple phase plates, no beam distortion is introduced, further improving link stability.

[0104] It should be noted that in the foregoing examples, the preset rotation angle of the first phase plate is taken as an example, and the first phase plate is a phase plate that performs phase modulation on the input light of the phase plate group. In actual applications, the preset rotation angle of any one phase plate in the second to Nth phase plate groups can also be 0. In the phase plate group, the preset rotation angle of a certain phase plate is set to 0 for the consideration of degrees of freedom, and based on the setting, N phase plates can correspond to N expected structured light beams.

[0105] It should also be noted that in the foregoing examples of the plurality of expressions, a full-transmissive phase plate group is taken as an example. For a phase plate of a transmissive mirror, the etching thickness is proportional to the quotient of the phase distribution function and the difference between the dielectric constant of the phase plate medium and the dielectric constant of air. If the phase plate is a phase plate of a reflective mirror, the etching thickness is half of that of the transmissive mirror under the same conditions.

[0106] In some optional embodiments, the phase plate group provided by the embodiments of the present application is applied to light beam switching in a common aperture scenario. The common aperture can be understood as that the input light is a light source.

[0107] Next, a full-transmissive phase plate group including two phase plates is taken as an example to further illustrate the phase plate group provided by the embodiments of the present application. Please refer to FIGS. 5 to 8, FIG. 5 is a schematic diagram of input light provided by the embodiments of the present application, FIG. 6 is a schematic diagram of an expected structured light beam provided by the embodiments of the present application, FIG. 7 is another schematic diagram of an expected structured light beam provided by the embodiments of the present application, and FIG. 8 is a schematic diagram of a phase distribution provided by the embodiments of the present application.

[0108] In the examples of FIGS. 5 to 8, the input light of the phase plate group is taken as a conventional Gaussian light beam shown in FIG. 5 as an example. The (a) diagram and the (b) diagram in FIG. 6 respectively represent the amplitude distribution and the phase distribution required by the target light beam 1. The (a) diagram and the (b) diagram in FIG. 7 respectively represent the amplitude distribution and the phase distribution required by the target light beam 2. The target light beam can also be referred to as an expected structured light beam.

[0109] In addition, the xy axis of the (a) diagram in FIG. 5, the (a) diagram in FIG. 6, and the (a) diagram in FIG. 7 represents a spatial orientation, and the z axis represents a normalized energy intensity. The (b) diagram in FIG. 6, the (b) diagram in FIG. 7, and each diagram in FIG. 8 are top views of phase plates, the xy axis represents a spatial orientation, and the z axis represents a phase value, which takes a value range of [-π, π].

[0110] Based on the principle shown in the foregoing expression, for example, if the preset rotation angle of the phase plate 1 is set to 0 and the preset rotation angle of the phase plate 2 is set to π, the phase distribution diagram of the phase plate 1 can be obtained as shown in (a) of FIG. 8, and the phase distribution diagram of the phase plate 2 can be obtained as shown in (b) of FIG. 8. In this example, in the state where the phase plate 1 and the phase plate 2 are directly opposite, the output light of the phase plate group is the foregoing target light beam 1. When the phase plate 1 remains unchanged and the phase plate 2 is rotated by an angle of π, the output light of the phase plate group is the foregoing target light beam 2.

[0111] For example, if the preset rotation angle of the phase plate 1 is set to 0 and the preset rotation angle of the phase plate 2 is set to π / 2, the phase distribution diagram of the phase plate 1 can be obtained as shown in (c) of FIG. 8, and the phase distribution diagram of the phase plate 2 can be obtained as shown in (d) of FIG. 8. In this example, in the state where the phase plate 1 and the phase plate 2 are directly opposite, the output light of the phase plate group is the foregoing target light beam 1. When the phase plate 1 remains unchanged and the phase plate 2 is rotated by an angle of π / 2, the output light of the phase plate group is the foregoing target light beam 2.

[0112] In the embodiments of the present application, a light antenna is also provided, and the light antenna comprises any one of the phase plate groups provided in the embodiments of the present application. The light antenna can also be referred to as a light machine.

[0113] In the embodiments of the present application, a FSO device is also provided, and the device comprises the foregoing light antenna.

[0114] In the foregoing related description, the phase plate group is described by taking the application of the phase plate group in wireless optical communication as an example. In this scenario, the phase plate group provided in the embodiments of the present application is placed in a FSO light antenna, and the switching of the optimal structure light beam of the FSO light machine in different scenarios (for example, different weather scenarios) is realized by rotating the phase plate. In actual applications, the phase plate group provided in the embodiments of the present application can also expand the working frequency band to other frequency bands such as frequency radiation and millimeter wave, and correspondingly, the application scenarios can be separated from the scenarios of resisting turbulence and rain attenuation in optical communication, thereby expanding to all scenarios requiring light beam or beam switching.

[0115] The embodiments of the present application also provide a processing method of a phase plate group, and the foregoing phase plate group is obtained based on the processing method. Please refer to FIG. 9, which is a flowchart of the processing method of the phase plate group provided in the embodiments of the present application.

[0116] 901. Obtain the phase distribution required by N expected structure light beams and the preset rotation angle of N phase plates.

[0117] Based on actual needs, a desired structured light beam is determined, and a phase distribution required to achieve the desired structured light beam is determined. A preset rotation angle of N phase plates included in the phase plate set can also be determined, where N is an integer greater than or equal to 2. The phase distribution required for the desired structured light beam can be understood as the phase distribution on a single phase plate when the desired structured light beam is generated by the phase plate. The aforementioned information is input to the processing device, so that the processing device obtains the phase distribution required for N desired structured light beams and the preset rotation angles of the N phase plates.

[0118] 902. Based on the phase distribution required for the N desired structured light beams and the preset rotation angles of the N phase plates, the phase distribution of the N phase plates is determined.

[0119] Specifically, the phase distribution of a first phase plate among the N phase plates can be determined based on the phase distribution required for the N desired structured light beams and the preset rotation angles of the N phase plates. The phase distribution of an i-th phase plate among the N phase plates can be determined based on the phase distribution required for an i-th desired structured light beam, the phase distribution required for the first desired structured light beam, and a preset rotation angle of the i-th phase plate, where 2≤i≤N and i is an integer. The principle of calculating the phase distribution of each phase plate is shown in the aforementioned examples of expressions 1 to 3, and will not be described here again.

[0120] 903. Based on the phase distribution of the N phase plates, the N phase plates are non-uniformly etched in the radial direction and the azimuthal direction to obtain the phase plate set.

[0121] Once the phase distribution of each phase plate is obtained, each phase plate can be etched based on the phase distribution. In the present application, the phase plate is non-uniformly etched in the radial direction and the azimuthal direction. Therefore, the phase distribution of the obtained phase plate in the radial direction and the azimuthal direction is non-uniform.

[0122] The first phase plate among the N phase plates is used to reflect or transmit input light of the phase plate set and to phase modulate the input light. The i-th phase plate among the N phase plates is used to reflect or transmit output light of a previous phase plate and to phase modulate the output light of the previous phase plate. The phase plate set is used to switch light beams by rotating the N phase plates.

[0123] In the embodiments of the present application, based on the phase distribution of each phase plate, each phase plate is non-uniformly etched in the radial direction and the azimuthal direction, so that the phase of each phase plate in the radial direction and the azimuthal direction is non-uniformly distributed. Since the phase distribution of the phase plate is determined based on the phase distribution required by the N expected structured light beams and the preset rotation angle of the N phase plates, the beam switching can be performed by rotating the phase plate, so that the output light of the phase plate group includes the expected structured light beam, and the operation of beam switching is simple. In addition, the phase plate group includes N phase plates, and the phase modulation of the input light is realized through the continuous reflection and / or transmission of the N phase plates to obtain the output light, without blocking the optical path, thereby improving the link stability. In addition, the expected structured light beam corresponding to each phase plate in the phase plate group and the preset rotation angle are different, so that the phase plate group can change the phase modulation of the input light by rotating different phase plates in the application, thereby outputting different structured light beams. The implementation of beam switching is provided, thereby improving the practicability of the technical scheme of the present application.

[0124] In some optional embodiments, the total phase distribution of the phase plate group is the sum of the phase distributions of the N phase plates.

[0125] In some optional embodiments, in the initial state, the total phase distribution is the phase distribution required by the first expected structured light beam in the N expected structured light beams.

[0126] In some optional embodiments, if the rotation angle of the i th phase plate in the N phase plates is the preset rotation angle of the i th phase plate, and the other phase plates are in the initial position, the total phase distribution is the phase distribution required by the i th expected structured light beam in the N expected structured light beams.

[0127] In some optional embodiments, if the rotation angle of the i th phase plate in the N phase plates is less than the preset rotation angle of the i th phase plate, and the other phase plates are in the initial state, the total phase distribution is a linear combination of the phase distribution required by the i th expected structured light beam in the N expected structured light beams and the phase distribution required by the first expected structured light beam.

[0128] In some optional embodiments, if the first phase plate in the N phase plates is in the initial state, and the rotation angles of the X phase plates are all less than the respective preset rotation angles, the total phase distribution is a linear combination of the phase distributions required by the X+1 expected structured light beams corresponding to the first phase plate and the X phase plates, 2≤X≤N-1.

[0129] It can be understood that the specific functions of the phase plate obtained based on the foregoing processing method have been described in the foregoing embodiments, and will not be described here.

[0130] The embodiment of the present application further provides a processing device of a phase plate set. Please refer to Fig. 10, which is a structural schematic diagram of the processing device of the phase plate provided by the embodiment of the present application.

[0131] In some optional embodiments, the processing device 1000 of the phase plate set comprises an acquisition unit 1001 and a processing unit 1002. The acquisition unit 1001 is configured to acquire phase distributions required by N desired structured light beams and preset rotation angles of the N phase plates, where N≥2.

[0132] The processing unit 1002 is configured to determine phase distributions of the N phase plates according to the phase distributions required by the N desired structured light beams and the preset rotation angles of the N phase plates. The N phase plates are obtained by performing non-uniform etching on both the radial direction and the azimuthal direction of the N phase plates according to the phase distributions of the N phase plates.

[0133] In the N phase plates, the first phase plate is configured to reflect or transmit input light of the phase plate set and perform phase modulation on the input light; the i th phase plate is configured to reflect or transmit output light of the previous phase plate and perform phase modulation on the output light of the previous phase plate, where 2≤i≤N. The phase plate set is configured to switch the light beams by rotating the N phase plates.

[0134] In some optional embodiments, the processing unit 1002 is specifically configured to determine the phase distribution of the first phase plate in the N phase plates according to the phase distributions required by the N desired structured light beams and the preset rotation angles of the N phase plates. The phase distribution of the i th phase plate in the N phase plates is determined according to the phase distribution required by the i th desired structured light beam, the phase distribution required by the first desired structured light beam, and the preset rotation angle of the i th phase plate, where 2≤i≤N and i is an integer.

[0135] In some optional embodiments, the total phase distribution of the phase plate set is the sum of the phase distributions of the N phase plates.

[0136] In some optional embodiments, in the initial state, the total phase distribution is the phase distribution required by the first desired structured light beam in the N desired structured light beams.

[0137] In some optional embodiments, if the rotation angle of the i th phase plate in the N phase plates is the preset rotation angle of the i th phase plate and the other phase plates are all in the initial positions, the total phase distribution is the phase distribution required by the i th desired structured light beam in the N desired structured light beams.

[0138] In some optional embodiments, if the rotation angle of the i th phase plate in the N phase plates is less than the preset rotation angle of the i th phase plate, and the other phase plates are in the initial state, the total phase distribution is a linear combination of the phase distribution required by the i th desired structured light beam in the N desired structured light beams and the phase distribution required by the first desired structured light beam.

[0139] In some optional embodiments, if the first phase plate in the N phase plates is in the initial state, and the rotation angles of the X phase plates are all less than the respective preset rotation angles, the total phase distribution is a linear combination of the phase distributions required by the X+1 desired structured light beams corresponding to the first phase plate and the X phase plates, 2≤X≤N-1.

[0140] The embodiment of the present application further provides a processing device of a phase plate set, comprising a processor and a memory coupled with the processor. The memory stores instructions, and when the instructions are executed on the processor, the processing device of the phase plate set implements the processing method of the phase plate set.

[0141] The embodiment of the present application further provides a computer readable storage medium, characterized in that the computer readable storage medium stores instructions, and when the instructions are executed on the processor, the processing method of the phase plate set is implemented.

[0142] The embodiment of the present application further provides a computer program product, characterized in that when the computer program product is executed on the computer, the processing method of the phase plate set is implemented.

[0143] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the system, device and unit described above can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0144] In the several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the device embodiments described above are only schematic. The division of the units is only a logical function division. There can be another division manner for actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual couplings or direct couplings or communication connections between the units can be indirect couplings or communication connections through some interfaces, devices or units, and can be electrical, mechanical or in other forms.

[0145] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0146] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present alone, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0147] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part of the prior art that contributes to the technical solutions or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various program code storage media.

Claims

1. A phase plate set, characterized by, The phase plate group comprises N phase plates, N≥2; Each phase plate in the N phase plate group is non-uniformly etched in the radial direction and the azimuthal direction, and the non-uniform etching corresponds to the phase distribution required by the N desired structured light beams and the preset rotation angle of the N phase plates; The first phase plate in the N phase plates is configured to reflect or transmit input light of the phase plate group and perform phase modulation on the input light; The i-th phase plate in the N phase plates is configured to reflect or transmit output light of the previous phase plate and perform phase modulation on the output light of the previous phase plate, 2≤i≤N; The phase plate group is configured to switch the light beams by rotating the N phase plates.

2. The phase plate set of claim 1, wherein, The non-uniform etching of the first phase plate in the N phase plates corresponds to the phase distribution required by the N desired structured light beams and the preset rotation angle of the N phase plates. The non-uniform etching of the i-th phase plate in the N phase plates corresponds to the phase distribution required by the i-th desired structured light beam, the phase distribution required by the first desired structured light beam, and the preset rotation angle of the i-th phase plate.

3. The phase plate set of claim 1 or 2, wherein The total phase distribution of the phase plate group is the sum of the phase distributions of the N phase plates.

4. The phase plate set of claim 3, wherein, In the initial state, the total phase distribution is the phase distribution required by the first desired structured light beam in the N desired structured light beams.

5. The phase plate set of claim 3, wherein, If the rotation angle of the i-th phase plate in the N phase plates is the preset rotation angle of the i-th phase plate and the other phase plates are in the initial position, the total phase distribution is the phase distribution required by the i-th desired structured light beam in the N desired structured light beams.

6. The phase plate set of claim 3, wherein, If the rotation angle of the i-th phase plate in the N phase plates is less than the preset rotation angle of the i-th phase plate and the other phase plates are in the initial state, the total phase distribution is a linear combination of the phase distribution required by the i-th desired structured light beam and the phase distribution required by the first desired structured light beam in the N desired structured light beams.

7. The phase plate set of claim 3, wherein, If the first phase plate in the N phase plates is in the initial state and the rotation angles of X phase plates are all less than the respective preset rotation angles, the total phase distribution is a linear combination of the phase distributions required by X+1 desired structured light beams corresponding to the first phase plate and the X phase plates, 2≤X≤N-1.

8. The phase plate set of any one of claims 1 to 7, wherein, The N phase plates are all transmission mirrors, and the geometric centers of the N phase plates are directly opposite.

9. The phase plate set of any one of claims 1 to 7, wherein, The N phase plates are all reflection mirrors, or the N phase plates comprise reflection mirrors and transmission mirrors.

10. A optical antenna characterized in that, The phase plate group comprises the phase plate group according to any one of the preceding claims 1 to 9.

11. A method of processing a phase plate set, characterized by, The phase plate group comprises N phase plates, N≥2, and the method comprises: obtaining the phase distribution required by the N desired structured light beams and the preset rotation angle of the N phase plates; determining the phase distribution of the N phase plates according to the phase distribution required by the N desired structured light beams and the preset rotation angle of the N phase plates; performing non-uniform etching in the radial direction and the azimuthal direction of the N phase plates according to the phase distribution of the N phase plates to obtain the phase plate group; and performing non-uniform etching in the radial direction and the azimuthal direction of the N phase plates according to the phase distribution of the N phase plates to obtain the phase plate group. The first phase plate of the N phase plates is configured to reflect or transmit input light of the phase plate group and perform phase modulation on the input light. The phase plate group is configured to switch the light beams by rotating the N phase plates.

12. The method of claim 11, wherein, The method comprises the following steps: According to the phase distribution required by the N desired structured light beams and the preset rotation angle of the N phase plates, the phase distribution of the N phase plates is determined. According to the phase distribution required by the N desired structured light beams and the preset rotation angle of the N phase plates, the phase distribution of the first phase plate of the N phase plates is determined.

13. An apparatus for processing a phase plate set, characterized by, According to the phase distribution required by the i-th desired structured light beam, the phase distribution required by the first desired structured light beam, and the preset rotation angle of the i-th phase plate, the phase distribution of the i-th phase plate of the N phase plates is determined. The method comprises the following steps: An acquisition unit is configured to acquire the phase distribution required by N desired structured light beams and the preset rotation angle of the N phase plates, N≥2. A processing unit is configured to determine the phase distribution of the N phase plates according to the phase distribution required by the N desired structured light beams and the preset rotation angle of the N phase plates.

14. An apparatus for processing a phase plate set, characterized by, The processing unit is further configured to perform non-uniform etching on the radial direction and the azimuthal direction of the N phase plates according to the phase distribution of the N phase plates, so as to obtain the phase plate group. The processing unit is further configured to perform non-uniform etching on the radial direction and the azimuthal direction of the N phase plates according to the phase distribution of the N phase plates, so as to obtain the phase plate group.

15. A computer-readable storage medium, characterized in that, The processing unit is further configured to perform non-uniform etching on the radial direction and the azimuthal direction of the N phase plates according to the phase distribution of the N phase plates, so as to obtain the phase plate group.

16. A computer program product, characterised in that, The processing unit is further configured to perform non-uniform etching on the radial direction and the azimuthal direction of the N phase plates according to the phase distribution of the N phase plates, so as to obtain the phase plate group. The processing unit is further configured to perform non-uniform etching on the radial direction and the azimuthal direction of the N phase plates according to the phase distribution of the N phase plates, so as to obtain the phase plate group. The processing unit is further configured to perform non-uniform etching on the radial direction and the azimuthal direction of the N phase plates according to the phase distribution of the N phase plates, so as to obtain the phase plate group. The processing unit is further configured to perform non-uniform etching on the radial direction and the azimuthal direction of the N phase plates according to the phase distribution of the N phase plates, so as to obtain the phase plate group.

Images