CN114785422B - A system for radially polarized vortex beam interference and transmission under water - Google Patents

A system for radially polarized vortex beam interference and transmission under water Download PDF

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CN114785422B
CN114785422B CN202210397270.5A CN202210397270A CN114785422B CN 114785422 B CN114785422 B CN 114785422B CN 202210397270 A CN202210397270 A CN 202210397270A CN 114785422 B CN114785422 B CN 114785422B
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CN114785422A (en
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王明军
张妍
代飞
刘敏
刁鲁欣
杜桂中
刘豪阵
刘宇隆
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Xian University of Technology
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/80Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
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    • G02B27/286Optical 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50Transmitters
    • H04B10/516Details of coding or modulation
    • H04B10/532Polarisation modulation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B10/00Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50Transmitters
    • H04B10/516Details of coding or modulation
    • H04B10/548Phase or frequency modulation

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Abstract

本发明实施例是关于一种径向偏振涡旋光束干涉在水下传输的系统,包括用于产生径向偏振反常涡旋光束与径向偏振完美涡旋光束的涡旋光束产生模块、用于形成不同强度湍流环境的水下湍流环境模块以及用于将两束涡旋光干涉后的光强信息进行接收的干涉图样接收模块;涡旋光束产生模块依次与所述水下湍流环境模块和干涉图样接收模块连接。实现了径向偏振反常涡旋光束与完美涡旋光束干涉叠加,再经过水下湍流环境后,通过CCD相机获得光强信息,从而在PC上通过干涉图样的光强闪烁程度,从而判断拓扑荷数不同的干涉叠加涡旋受湍流环境影响的大小。

The embodiment of the present invention relates to a system for radially polarized vortex beam interference for underwater transmission, which includes a vortex beam generation module for generating a radially polarized abnormal vortex beam and a radially polarized perfect vortex beam. Underwater turbulent environment modules that form turbulent environments of different strengths and an interference pattern receiving module for receiving light intensity information after interference of two vortex light beams; the vortex beam generating module is sequentially connected to the underwater turbulent environment module and the interference pattern Receive module connection. The interference superposition of the radially polarized abnormal vortex beam and the perfect vortex beam is realized. After passing through the underwater turbulent environment, the light intensity information is obtained through the CCD camera, and the topological charge is judged by the light intensity flickering degree of the interference pattern on the PC. Several different interference superposed vortices are affected by the turbulent environment.

Description

一种径向偏振涡旋光束干涉在水下传输的系统A system for radially polarized vortex beam interference and transmission under water

技术领域Technical field

本发明涉及一种激光通信与水下光通信技术领域,具体涉及一种径向偏振涡旋光束干涉在水下传输的系统。The invention relates to the technical fields of laser communication and underwater optical communication, and in particular to a system for underwater transmission of radially polarized vortex beam interference.

背景技术Background technique

近年来,激光技术的不断发展,使得其在众多领域,如信息通讯、生物、材料、化学、国防等方面有着广泛的应用。研究中,一种具有轨道角动量(orbital an-gularmomentum,OAM)的涡旋光束引起了学者们的注意。不同于普通的高斯光束,OAM可以提供相当数量的复用信道用于信息传输。携带OAM的光子有着更高的安全性、保密性和隐蔽性,故而涡旋光束在光通讯领域中具有较高的研究意义。In recent years, the continuous development of laser technology has made it widely used in many fields, such as information and communications, biology, materials, chemistry, national defense, etc. During the research, a vortex beam with orbital angular momentum (OAM) attracted the attention of scholars. Unlike ordinary Gaussian beams, OAM can provide a considerable number of multiplexed channels for information transmission. Photons carrying OAM have higher security, confidentiality and concealment, so vortex beams have high research significance in the field of optical communications.

随着水下光通信、水下目标探测等领域的兴起,激光束在水环境中的传输特性成为近几年的研究热点。与大气环境相比,水下光通信面临着巨大挑战。当涡旋光束在湍流中传输时,无规则、随机运动的湍流环境会对光束造成光束扩展,退偏效应,退相干效应,光束抖动等负面影响从而影响涡旋光束的传输质量,因此需要寻找合适的方法来提高涡旋光束的抗湍流能力。为此很多学者开展了关于波源处偏振调控方面的研究,径向偏振光束即为其中的一种。在现有研究中对反常涡旋光束与其他涡旋光束的干涉在水下传输特性研究较少,同时对径向偏振反常涡旋光束与完美涡旋光束的研究较少。With the rise of underwater optical communications, underwater target detection and other fields, the transmission characteristics of laser beams in water environments have become a research hotspot in recent years. Compared with the atmospheric environment, underwater optical communications face huge challenges. When a vortex beam is transmitted in turbulence, the irregular and random motion of the turbulent environment will cause beam expansion, depolarization effect, decoherence effect, beam jitter and other negative effects on the beam, thus affecting the transmission quality of the vortex beam. Therefore, it is necessary to find Suitable methods to improve the turbulence resistance of vortex beams. For this reason, many scholars have carried out research on polarization control at the wave source, and radially polarized beam is one of them. In existing research, there are few studies on the underwater transmission characteristics of the interference between anomalous vortex beams and other vortex beams, and there are few studies on radially polarized anomalous vortex beams and perfect vortex beams.

本发明基于上述问题对径向偏振反常涡旋光束与完美涡旋光束干涉在水下湍流中的传输特性进行研究。这对提高涡旋光束的在水下的传输性能,具有重要的现实意义,尤其在水下光通信和水下目标探测等领域的应用具有潜在的指导意义和工程价值。Based on the above problems, the present invention studies the transmission characteristics of the interference of radially polarized anomalous vortex beams and perfect vortex beams in underwater turbulence. This has important practical significance for improving the transmission performance of vortex beams under water, and has potential guiding significance and engineering value in applications in the fields of underwater optical communications and underwater target detection.

需要注意的是,本部分旨在为权利要求书中陈述的本发明的实施方式提供背景或上下文。此处的描述不因包括在本部分中就承认是现有技术。It is noted that this section is intended to provide background or context for the embodiments of the invention set forth in the claims. The description herein is not admitted to be prior art by inclusion in this section.

发明内容Contents of the invention

本发明实施例的目的在于提供一种径向偏振涡旋光束干涉在水下传输的方法,实现了径向偏振反常涡旋光束与完美涡旋光束干涉叠加,从而判断拓扑荷数不同的干涉叠加涡旋受湍流环境影响的大小。The purpose of the embodiments of the present invention is to provide a method for radially polarized vortex beam interference for underwater transmission, which realizes the interference superposition of radially polarized abnormal vortex beams and perfect vortex beams, thereby determining the interference superposition of different topological charges. The size of the vortex affected by the turbulent environment.

本发明的技术方案如下:The technical solution of the present invention is as follows:

该径向偏振涡旋光束干涉在水下传输的系统,包括用于产生径向偏振反常涡旋光束与径向偏振完美涡旋光束的涡旋光束产生模块、用于形成不同强度湍流环境的水下湍流环境模块以及用于将两束涡旋光干涉后的光强信息进行接收的干涉图样接收模块;The system for radially polarized vortex beam interference and transmission under water includes a vortex beam generation module for generating radially polarized abnormal vortex beams and radially polarized perfect vortex beams, and a water turbulent environment for forming different intensities. The lower turbulent environment module and the interference pattern receiving module used to receive the light intensity information after the interference of the two vortex lights;

所述涡旋光束产生模块依次与所述水下湍流环境模块和干涉图样接收模块连接。The vortex beam generating module is connected to the underwater turbulent environment module and the interference pattern receiving module in sequence.

进一步地,上述的涡旋光束产生模块包括He-Ne激光器、准直扩束器、第一分束器、第一起偏器、空间光调制器、第一径向偏振转换器、反射镜、第二起偏器、消偏振分束器、反射式空间光调制器、第二计算器、傅里叶透镜、第二径向偏振转换器和第二分束器);Further, the above-mentioned vortex beam generating module includes a He-Ne laser, a collimating beam expander, a first beam splitter, a first polarizer, a spatial light modulator, a first radial polarization converter, a reflecting mirror, a third Second polarizer, depolarizing beam splitter, reflective spatial light modulator, second calculator, Fourier lens, second radial polarization converter and second beam splitter);

所述He-Ne激光器的输出端与所述准直扩束器的输入端连接,所述准直扩束器的输出端与所述第一分束器的输入端连接;所述第一分束器的输出端分成两路光束,一路依次与所述第一起偏器)、空间光调制器、第一径向偏振转换器、反射镜和第二分束器连接,另外一路依次与所述第二起偏器、消偏振分束器、第二径向偏振转换器和第二分束器连接;The output end of the He-Ne laser is connected to the input end of the collimated beam expander, and the output end of the collimated beam expander is connected to the input end of the first beam splitter; the first splitter The output end of the beam device is divided into two beams, one of which is sequentially connected to the first polarizer), spatial light modulator, first radial polarization converter, reflector and second beam splitter, and the other is sequentially connected to the The second polarizer, the depolarizing beam splitter, the second radial polarization converter and the second beam splitter are connected;

所述消偏振分束器依次连接有所述傅里叶透镜、反射式空间光调制器和第二计算器。The depolarizing beam splitter is connected to the Fourier lens, the reflective spatial light modulator and the second calculator in sequence.

进一步地,上述涡旋光束产生模块还包括第一计算器,所述第一计算器与所述空间光调制器连接。Further, the above-mentioned vortex beam generating module further includes a first calculator, and the first calculator is connected to the spatial light modulator.

进一步地,上述准直扩束器由两个焦点重合的凸透镜组成。Further, the above-mentioned collimating beam expander is composed of two convex lenses with coincident focal points.

进一步地,上述湍流环境模块包括水槽和湍流产生器;所述水槽与所述第二分束器的输出端连接,所述湍流产生器设置于所述水槽上。Further, the above-mentioned turbulent environment module includes a water tank and a turbulence generator; the water tank is connected to the output end of the second beam splitter, and the turbulence generator is arranged on the water tank.

进一步地,上述干涉图样接收模块包括用于调整偏振角度的偏振片、用于调整光斑大小的光阑和CCD相机;Further, the above-mentioned interference pattern receiving module includes a polarizer for adjusting the polarization angle, an aperture for adjusting the spot size, and a CCD camera;

所述偏振片的输入端与所述水槽(16)连接,所述偏振片的输出端依次连接有光阑和CCD相机。The input end of the polarizer is connected to the water tank (16), and the output end of the polarizer is connected to an aperture and a CCD camera in sequence.

本发明的实施例提供的技术方案可以包括以下有益效果:The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

本发明提供一种径向偏振涡旋光束干涉在水下传输的系统,实现了径向偏振反常涡旋光束与完美涡旋光束干涉叠加,再经过水下湍流环境后,通过CCD相机获得光强信息,从而在PC上通过干涉图样的光强闪烁程度,从而判断拓扑荷数不同的干涉叠加涡旋受湍流环境影响的大小。The invention provides a system for radially polarized vortex beam interference for underwater transmission, which realizes the interference superposition of radially polarized abnormal vortex beam and perfect vortex beam. After passing through the underwater turbulent environment, the light intensity is obtained through a CCD camera. Information can be used to determine the extent of the interference superposition vortices with different topological charges affected by the turbulent environment through the degree of light intensity flickering of the interference pattern on the PC.

附图说明Description of the drawings

图1是本发明工作原理图。Figure 1 is a diagram of the working principle of the present invention.

图2是本发明涡旋光产生模块中所需的贝塞尔涡旋光束的灰度相位图;Figure 2 is a grayscale phase diagram of the Bessel vortex beam required in the vortex light generation module of the present invention;

图3是本发明涡旋光产生模块中所需的反常涡旋光束的灰度相位图。Figure 3 is a grayscale phase diagram of the anomalous vortex beam required in the vortex light generation module of the present invention.

图中,1.He-Ne激光器、2.准直扩束器、3.第一分束器、4.第一起偏器、5.空间光调制器、6.第一计算器、7.第一径向偏振转换器、8.反射镜、9.第二起偏器、10.消偏振分束器、11.反射式空间光调制器、12.第二计算器、13.傅里叶透镜、14.第二径向偏振转换器、15.第二分束器、16.水槽、17.湍流产生器、18.偏振片、19.光阑、20.CCD相机。In the figure, 1.He-Ne laser, 2.Collimated beam expander, 3.First beam splitter, 4.First polarizer, 5.Spatial light modulator, 6.First calculator, 7. A radial polarization converter, 8. Reflector, 9. Second polarizer, 10. Depolarizing beam splitter, 11. Reflective spatial light modulator, 12. Second calculator, 13. Fourier lens , 14. Second radial polarization converter, 15. Second beam splitter, 16. Water tank, 17. Turbulence generator, 18. Polarizer, 19. Diaphragm, 20. CCD camera.

具体实施方式Detailed ways

下面结合附图和具体实施方式对本发明进行详细说明。The present invention will be described in detail below with reference to the drawings and specific embodiments.

如图1所示径向偏振涡旋光束干涉在水下传输的系统包括涡旋光束产生模块(径向偏振反常涡旋和径向偏振完美涡旋的产生)、湍流环境模块、干涉图样接收模块。其中:所述涡旋光束产生模块用于产生径向偏振反常涡旋光束、径向偏振完美涡旋光束;所述水下湍流环境模块用于形成不同强度的湍流环境;所述干涉图样接收模块用于将两束涡旋光干涉后的光强信息进行接收(径向偏振反常涡旋光束+径向偏振完美涡旋光束)。As shown in Figure 1, the system for underwater transmission of radially polarized vortex beam interference includes a vortex beam generation module (generation of radial polarization anomalous vortex and radial polarization perfect vortex), turbulent environment module, and interference pattern receiving module . Among them: the vortex beam generating module is used to generate radially polarized abnormal vortex beams and radially polarized perfect vortex beams; the underwater turbulent environment module is used to form turbulent environments of different intensities; and the interference pattern receiving module Used to receive the light intensity information after the interference of two vortex lights (radial polarization abnormal vortex beam + radial polarization perfect vortex beam).

其中,涡旋光束产生模块包括He-Ne激光器1、准直扩束器2、分束器3、第二起偏器4、空间光调制器5、第一计算器6、径向偏振转换器7、第二起偏器9、消偏振分束器10、反射式空间光调制器11、第二计算器12、傅里叶透镜13、径向偏振转换器14和第二分束器15。Among them, the vortex beam generation module includes He-Ne laser 1, collimated beam expander 2, beam splitter 3, second polarizer 4, spatial light modulator 5, first calculator 6, radial polarization converter 7. Second polarizer 9, depolarizing beam splitter 10, reflective spatial light modulator 11, second calculator 12, Fourier lens 13, radial polarization converter 14 and second beam splitter 15.

准直扩束器2由两个焦点重合的凸透镜组成,用于改善光束的方向性,减少由于涡旋光束在干涉时产生的附加相位,压缩光束的发散角,使在计算机上观察到的涡旋光束光强分布均匀。The collimating beam expander 2 is composed of two convex lenses with coincident focal points. It is used to improve the directionality of the beam, reduce the additional phase caused by the interference of the vortex beam, compress the divergence angle of the beam, and make the vortex observed on the computer The light intensity of the rotating beam is evenly distributed.

径向偏振转换器7和径向偏振转换器14用于将线偏振光转化为径向偏振涡旋光束。The radial polarization converter 7 and the radial polarization converter 14 are used to convert linearly polarized light into a radially polarized vortex beam.

第一计算器用于将反常涡旋光束的螺旋相位图加载到空间光调制器5上。第二计算器12用于将完美涡旋光束的螺旋相位图加载到反射式空间光调制器11上。The first calculator is used to load the helical phase pattern of the anomalous vortex beam onto the spatial light modulator 5 . The second calculator 12 is used to load the spiral phase pattern of the perfect vortex beam onto the reflective spatial light modulator 11 .

反射式空间光调制器11,其允许最大反射角为±5°,用于将形成的涡旋光束再反射到傅里叶透镜13上。The reflective spatial light modulator 11 , which allows a maximum reflection angle of ±5°, is used to reflect the formed vortex beam onto the Fourier lens 13 .

第一起偏器4和第二起偏器9,光束入射到起偏器后,其透射光将获得水平线偏振光。After the light beam is incident on the first polarizer 4 and the second polarizer 9, the transmitted light will obtain horizontal linearly polarized light.

湍流产生器17,用于产生不同强度的湍流环境。(利用旋钮旋转角表征湍流强弱,旋转角越大,湍流强度越强,反之,则越弱)。Turbulence generator 17 is used to generate turbulent flow environments of different intensities. (The rotation angle of the knob is used to characterize the intensity of turbulence. The greater the rotation angle, the stronger the turbulence intensity, and vice versa).

偏振片18用于调整两束涡旋光束的偏振角度,使它们的偏振方向互相垂直,发生干涉叠加。The polarizing plate 18 is used to adjust the polarization angles of the two vortex beams so that their polarization directions are perpendicular to each other and interfere with each other.

光阑19用于调整光斑大小。Diaphragm 19 is used to adjust the spot size.

干涉接收模块为CCD相机20,用于接收干涉叠加的径向偏振涡旋的光强信息,成像后传输至计算机。The interference receiving module is a CCD camera 20, which is used to receive the light intensity information of the interference superimposed radial polarization vortex, and then transmits it to the computer after imaging.

氦氖激光器输出基模高斯光束后,经过由两个焦点重合的凸透镜组成准直器,然后经分束器分成两束光:一束入射到第一起偏器4,产生的线偏振光入射纯位相液晶空间光调制器5,通过第一计算器6控制端加载反常涡旋光束灰度图对线偏振光进行位相调制,获得相应的反常涡旋光束,反常涡旋光入射到第一径向偏振转换器7,产生径向偏振反常涡旋光束;另一束光束入射到第二起偏器9后入射到消偏振分束器10到达反射式空间光调制器11,(反射式纯位相液晶空间光调制器加载贝塞尔高斯涡旋光束相位图),产生贝塞尔高斯涡旋光束,其经过傅里叶透镜13后形成完美涡旋光束,完美涡旋光束依次入射到第二径向偏振转换器14后产生径向偏振完美涡旋光束。After the helium-neon laser outputs the fundamental mode Gaussian beam, it passes through a collimator composed of two coincident convex lenses, and then is divided into two beams of light by a beam splitter: one beam is incident on the first polarizer 4, and the generated linearly polarized light is incident on pure The phase liquid crystal spatial light modulator 5 loads the anomalous vortex beam grayscale image through the control end of the first calculator 6 to perform phase modulation on the linearly polarized light to obtain the corresponding anomalous vortex beam. The anomalous vortex light is incident on the first radially polarized light. Converter 7 generates a radially polarized anomalous vortex beam; another beam is incident on the second polarizer 9 and then incident on the depolarizing beam splitter 10 and reaches the reflective spatial light modulator 11 (reflective pure phase liquid crystal space The optical modulator loads the Bessel Gaussian vortex beam phase diagram) to generate the Bessel Gaussian vortex beam, which forms a perfect vortex beam after passing through the Fourier lens 13, and the perfect vortex beam is incident on the second radial polarization in turn. The converter 14 produces a radially polarized perfect vortex beam.

如图2和3所示,利用软件matlab对本发明中的涡旋光束产生模块所需的灰度相位图进行仿真。As shown in Figures 2 and 3, the software matlab is used to simulate the grayscale phase diagram required by the vortex beam generation module in the present invention.

螺旋相位片的相位表达式为使高斯光束经过该相位元件,能够引入一个螺旋相位延迟并在光束中心引起相位奇点。用MATLAB编写的灰度图,灰度值分布在The phase expression of the spiral phase plate is Passing a Gaussian beam through this phase element can introduce a spiral phase delay and cause a phase singularity at the center of the beam. A grayscale image written in MATLAB, with grayscale values distributed in

0—255之间,而加载到空间光上的信息,应从0—1分布对应的0—2π的相位调制,因此编写后的全息图需要进行归一化处理。将模拟生成的螺旋相位图加载空间光调制器上,可以模拟其相位分布图,进而生成所需的涡旋光束。Between 0-255, the information loaded onto the spatial light should be distributed from 0-1 corresponding to the phase modulation of 0-2π, so the written hologram needs to be normalized. Loading the spiral phase diagram generated by simulation onto the spatial light modulator can simulate its phase distribution diagram, thereby generating the required vortex beam.

利用matlab进行仿真,图2生成本发明所需要的贝塞尔高斯涡旋光束的灰度相位图,通过精确控制相位图加载到液晶空间光调制器产生所需的贝塞尔高斯涡旋光束后通过傅里叶透镜,即可生成本发明所需的完美涡旋光束。Using matlab for simulation, Figure 2 generates the grayscale phase diagram of the Bessel Gaussian vortex beam required by the present invention. After accurately controlling the phase diagram, it is loaded into the liquid crystal spatial light modulator to generate the required Bessel Gaussian vortex beam. Through the Fourier lens, the perfect vortex beam required by the present invention can be generated.

利用matlab进行仿真,图3生成本发明所需要的反常涡旋光束的灰度相位图,通过精确控制相位图加载到液晶空间光调制器产生所需的反常涡旋光束。(例如:图中给出拓扑荷数为4的涡旋光束).Using matlab for simulation, Figure 3 generates the grayscale phase diagram of the anomalous vortex beam required by the present invention. The required anomalous vortex beam is generated by accurately controlling the phase diagram and loading it into the liquid crystal spatial light modulator. (For example: the figure shows a vortex beam with a topological charge of 4).

在本说明书的描述中,参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。此外,本领域的技术人员可以将本说明书中描述的不同实施例或示例进行接合和组合。In the description of this specification, reference to the terms "one embodiment," "some embodiments," "an example," "specific examples," or "some examples" or the like means that specific features are described in connection with the embodiment or example. , structures, materials or features are included in at least one embodiment or example of the invention. In this specification, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may join and combine the different embodiments or examples described in this specification.

本领域技术人员在考虑说明书及实践这里公开的发明后,将容易想到本发明的其它实施方案。本申请旨在涵盖本发明的任何变型、用途或者适应性变化,这些变型、用途或者适应性变化遵循本发明的一般性原理并包括本发明未公开的本技术领域中的公知常识或惯用技术手段。说明书和实施例仅被视为示例性的,本发明的真正范围和精神由所附的权利要求指出。Other embodiments of the invention will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary technical means in the technical field that are not disclosed in the invention. . It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

Claims (3)

1. A system for transmission under water by interference of radially polarized vortex beams, characterized in that:
the device comprises a vortex beam generating module for generating radial polarized abnormal vortex beams and radial polarized perfect vortex beams, an underwater turbulence environment module for forming different intensity turbulence environments, and an interference pattern receiving module for receiving light intensity information after interference of the two vortex beams;
the vortex beam generation module is sequentially connected with the underwater turbulence environment module and the interference pattern receiving module;
the vortex beam generation module comprises a He-Ne laser (1), a collimation beam expander (2), a first beam splitter (3), a first polarizer (4), a spatial light modulator (5), a first radial polarization converter (7), a reflecting mirror (8), a second polarizer (9), a depolarizing beam splitter (10), a reflection spatial light modulator (11), a second calculator (12), a Fourier lens (13), a second radial polarization converter (14) and a second beam splitter (15);
the output end of the He-Ne laser (1) is connected with the input end of the collimation beam expander (2), and the output end of the collimation beam expander (2) is connected with the input end of the first beam splitter (3); the output end of the first beam splitter (3) is divided into two paths of light beams, one path of the light beams is sequentially connected with the first polarizer (4), the spatial light modulator (5), the first radial polarization converter (7), the reflecting mirror (8) and the second beam splitter (15), and the other path of the light beams is sequentially connected with the second polarizer (9), the depolarizing beam splitter (10), the second radial polarization converter (14) and the second beam splitter (15);
the depolarizing beam splitter (10) is sequentially connected with the Fourier lens (13), the reflective spatial light modulator (11) and the second calculator (12);
the vortex beam generation module further comprises a first calculator (6), wherein the first calculator (6) is connected with the spatial light modulator (5);
the interference pattern receiving module comprises a polaroid (18) for adjusting the polarization angle, a diaphragm (19) for adjusting the size of a light spot and a CCD camera (20);
the input end of the polaroid (18) is connected with the water tank (16), and the output end of the polaroid (18) is sequentially connected with a diaphragm (19) and a CCD camera (20);
after the He-Ne laser (1) outputs a Gaussian beam of a fundamental mode, the Gaussian beam passes through a collimator formed by two convex lenses with coincident focuses, and is split into two beams of light by a beam splitter: one beam is incident to a first polarizer (4), the generated linear polarized light is incident to a pure phase liquid crystal spatial light modulator (5), the linear polarized light is subjected to phase modulation by loading an abnormal vortex light beam gray scale image at a control end of a first calculator (6) to obtain a corresponding abnormal vortex light beam, the abnormal vortex light is incident to a first radial polarization converter (7), and a radial polarization abnormal vortex light beam is generated; the other beam is incident to the second polarizer (9) and then is incident to the depolarizing beam splitter (10) to reach the reflective spatial light modulator (11) to generate Bessel Gaussian vortex beams, the Bessel Gaussian vortex beams pass through the Fourier lens (13) to form perfect vortex beams, and the perfect vortex beams are sequentially incident to the second radial polarization converter (14) to generate radial polarized perfect vortex beams.
2. The system for transmission under water of radially polarized vortex beam interference of claim 1 wherein: the collimation beam expander (2) consists of two convex lenses with coincident focuses.
3. A system for transmission under water of radially polarized vortex beam interference according to claim 1 or 2 wherein:
the turbulent environment module comprises a water tank (16) and a turbulent generator (17); the water tank (16) is connected with the output end of the second beam splitter (15), and the turbulence generator (17) is arranged on the water tank (16).
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