Device and method for generating anti-turbulence chaos Bessel Gaussian beam

Abstract

The invention belongs to the technical field of optical communication safety, and aims to solve the problem that the robustness of chaotic laser in a turbulent environment is poor and the chaotic laser is seriously limited in long-distance free space optical communication. The invention provides an anti-turbulence chaotic Bessel Gaussian beam generation device and method, and the method comprises the following steps: laser is collimated through a first plano-convex lens, passes through an adjustable continuous light attenuation mirror and a dielectric film reflector, then returns to the interior of a laser, and generates a chaotic Gaussian beam based on the disturbance of a light field; a chaotic Gaussian beam is emitted from a first non-polarization beam splitter, and the polarization state of the beam is adjusted through a half-wave plate and a linear polarizer, so that the working direction of the beam is the same as that of a reflective pure-phase spatial light modulator; and the beam is expanded by the second plano-convex lens and the third plano-convex lens and is transmitted to the reflective pure-phase spatial light modulator to obtain an l-order chaotic Bessel-Gaussian beam. According to the invention, the chaotic laser and the Bessel beam are combined to cope with a complex space optical communication environment.

Description

Technical Field

[0001] The present invention belongs to the field of optical communication security technology, and in particular relates to a device and method for generating a turbulence-resistant chaotic Bessel-Gaussian light beam. Background Art

[0002] In recent years, with the increasing demand for optical communications, the security threats faced by traditional cryptography have become increasingly greater, making the physical layer security transmission of space optical communications extremely important. Chaotic lasers have become the key to meeting the security challenges of modern optical communications due to their high bandwidth, noise-like characteristics and synchronization capabilities.

[0003] The noise-like characteristics of chaotic lasers make it difficult to intercept and decode the transmitted information, thus ensuring the security of the communication system. However, chaotic lasers have poor robustness in turbulent environments, which seriously limits their application in long-distance free-space optical communications. Summary of the invention

[0004] In order to solve at least one of the above technical problems existing in the prior art, the present invention provides a device and method for generating a turbulence-resistant chaotic Bessel-Gaussian beam.

[0005] The present invention is implemented by the following technical solutions: a device for generating a turbulence-resistant chaotic Bessel-Gaussian beam, comprising a chaotic laser generating module, a chaotic Bessel-Gaussian beam construction module and a chaotic Bessel-Gaussian beam self-healing and turbulence-resistant characteristic verification module;

[0006] The chaotic laser generation module comprises a laser and a first plano-convex lens, a first non-polarizing beam splitter, an adjustable continuous light attenuation mirror and a dielectric film reflector which are sequentially arranged along the laser emission path of the laser. The chaotic laser generation module is used to generate a chaotic Gaussian beam.

[0007] The chaotic Bessel-Gaussian beam construction module is located on the path of the chaotic Gaussian beam emitted by the non-polarization beam splitter, and includes a half-wave plate, a linear polarizer, a second plano-convex lens, a third plano-convex lens and a reflective pure phase spatial light modulator arranged in sequence. The chaotic Bessel-Gaussian beam construction module is used to generate a l-order chaotic Bessel-Gaussian beam;

[0008] The chaotic Bessel-Gaussian beam self-healing and anti-turbulence characteristics verification module is located on the path of the l-order chaotic Bessel-Gaussian beam emitted by the reflective pure phase spatial light modulator, and includes an obstacle, a turbulent phase screen and a second non-polarizing beam splitter arranged in sequence. The second non-polarizing beam splitter is used to split the l-order chaotic Bessel-Gaussian beam passing through the obstacle and the turbulent phase screen. One of the l-order chaotic Bessel-Gaussian beams is coupled to a photodetector through a fifth plano-convex lens, and an oscilloscope is connected to the output end of the photodetector. The other l-order chaotic Bessel-Gaussian beam is coupled to a charge-coupled device through a 4f observation system composed of a fourth plano-convex lens and a sixth plano-convex lens.

[0009] Preferably, in the chaotic laser generating module, the laser is a Fabry-Perot single-mode semiconductor laser with a central wavelength of 850 nm, the focal length of the first plano-convex lens is 5 mm, and the first non-polarizing beam splitter is a 50:50 non-polarizing beam splitter.

[0010] Preferably, in the construction module of the chaotic Bessel-Gaussian beam, the focal length of the second plano-convex lens is 25 mm, and the focal length of the third plano-convex lens is 75 mm.

[0011] Preferably, the second non-polarizing beam splitter is a 50:50 non-polarizing beam splitter, the focal length of the fourth plano-convex lens is 25 mm, the focal length of the fifth plano-convex lens is 5 mm, and the focal length of the sixth plano-convex lens is 25 mm.

[0012] The present invention also provides a method for generating a turbulence-resistant chaotic Bessel-Gaussian beam, comprising the following steps:

[0013] The laser generates laser light, which is collimated by the first plano-convex lens, and then returns to the inside of the laser after passing through the adjustable continuous light attenuation mirror and the dielectric film reflector. Based on the disturbance of the light field, a chaotic Gaussian beam is generated.

[0014] The chaotic Gaussian beam is emitted from the first non-polarizing beam splitter, and the polarization state of the beam is adjusted by the half-wave plate and the linear polarizer to make it the same as the working direction of the reflective pure phase spatial light modulator. The beam is expanded by the second plano-convex lens and the third plano-convex lens and propagated to the reflective pure phase spatial light modulator to obtain the l-order chaotic Bessel Gaussian beam. The reflective pure phase spatial light modulator is loaded with a holographic phase image composed of a spiral phase superimposed with a radially distributed angular cone phase.

[0015] The l-order chaotic Bessel-Gaussian beam passes through obstacles and turbulent phase screen, and is split 50:50 by the second non-polarizing beam splitter. One of the l-order chaotic Bessel-Gaussian beams is coupled to a photodetector by a fifth plano-convex lens, and an oscilloscope is used to monitor whether the laser is working in a chaotic state. The other l-order chaotic Bessel-Gaussian beam is coupled to a charge-coupled device via a 4f observation system composed of a fourth plano-convex lens and a sixth plano-convex lens, and the lateral intensity distribution of the chaotic Bessel-Gaussian beam is observed.

[0016] Preferably, after the l-order chaotic Bessel-Gaussian beam is generated, it also includes simulating and experimentally verifying its self-healing characteristics;

[0017] The process of simulating the self-healing characteristics is as follows: extract the intensity and phase information of the chaotic laser at a time point to construct the field of the chaotic Bessel-Gaussian beam, use a blazed grating to simulate an opaque circular obstacle to block the light field at the source field, and use the angular spectrum method to perform Fresnel diffraction propagation to observe its self-healing characteristics on the propagation path;

[0018] The experimental verification process is as follows: use an opaque obstacle to block the chaotic Bessel-Gaussian beam on the propagation path and observe its self-healing properties.

[0019] Preferably, after the generation of the l-order chaotic Bessel-Gaussian beam, the method further includes verifying the robustness of the chaotic Bessel-Gaussian beam in a turbulent environment:

[0020] The modified Von Karman spectrum model is used as the power spectrum density model of the turbulence phase screen, and multiple turbulence phase screens are placed on the propagation path to simulate the light field distortion and drift caused by the real environment. The actual model is given by the following formula:

[0021]

[0022] where f m =5.92 / l0 and f0=2π / L0, l0 and L0 are the inner and outer scales respectively, f is the angular spatial frequency, is the refractive index structure parameter used to measure the local turbulence intensity.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The present invention proposes a turbulence-resistant chaotic Bessel-Gaussian beam, which combines chaotic lasers with Bessel beams to cope with complex spatial optical communication environments. Experimental and simulation results show that even in the presence of obstacles or turbulent environments in the propagation path, the chaotic Bessel-Gaussian beam can still maintain good wavefront and light intensity distribution characteristics, thereby significantly enhancing the system's anti-interference ability and the stability of long-distance communications. This invention proves the key role of constructing chaotic Bessel-Gaussian beams in improving free-space optical secure communications, and provides a new solution for secure communications in complex environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 It is a system block diagram of the generation of the turbulence-resistant and self-healing chaotic Bessel-Gaussian beam and its propagation characteristics of the present invention.

[0027] Figure 2 is the timing diagram of chaotic Bessel-Gaussian beams carrying orbital angular momentum of different orders;

[0028] Figure 3 is the spectrum of chaotic Bessel-Gaussian beams carrying orbital angular momentum of different orders;

[0029] Figure 4 is the intensity distribution diagram of chaotic Bessel-Gaussian beams carrying orbital angular momentum of different orders (experimental);

[0030] Figure 5 is the intensity distribution diagram (simulation) of chaotic Bessel-Gaussian beams carrying orbital angular momentum of different orders;

[0031] Figure 6 is the phase distribution diagram of chaotic Bessel-Gaussian beams carrying orbital angular momentum of different orders;

[0032] Figure 7 It is the self-healing light field diagram of the simulated chaotic Bessel-Gaussian beam when it passes through an obstacle on the propagation path;

[0033] Figure 8 It is the self-healing light field diagram of the chaotic Bessel-Gaussian beam when there is a real obstacle on the propagation path in the experiment;

[0034] Fig. 9 is the normalized power attenuation diagram of the chaotic Bessel-Gaussian beam and the chaotic Gaussian beam after passing through the turbulent phase screen;

[0035] Fig.10 It is the light field distribution diagram of chaotic Bessel-Gaussian beam and chaotic Gaussian beam at different propagation distances.

[0036] In the figure: 101-laser; 102-first plano-convex lens; 103-first non-polarizing beam splitter; 104-adjustable continuous light attenuation mirror; 105-dielectric film reflector; 201-half-wave plate; 202-linear polarizer; 203-second plano-convex lens; 204-third plano-convex lens; 205-reflective pure phase spatial light modulator; 301-obstacle; 302-turbulent phase screen; 303-second non-polarizing beam splitter; 304-fourth plano-convex lens; 305-fifth plano-convex lens; 306-photodetector; 307-oscilloscope; 308-sixth plano-convex lens; 309-charge coupled device. DETAILED DESCRIPTION

[0037] In conjunction with the drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0038] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention. It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0039] The present invention provides an embodiment:

[0040] like Figure 1As shown, a device for generating a turbulence-resistant chaotic Bessel-Gaussian beam comprises a chaotic laser generating module, a chaotic Bessel-Gaussian beam construction module and a chaotic Bessel-Gaussian beam self-healing and anti-turbulence characteristic verification module; the chaotic laser generating module comprises a laser 101 and a first plano-convex lens 102, a first non-polarizing beam splitter 103, an adjustable continuous light attenuation mirror 104 and a dielectric film reflector 105 arranged in sequence along the laser emission path of the laser 101, and the chaotic laser generating module is used to generate a chaotic Gaussian beam; the chaotic Bessel-Gaussian beam construction module is located on the path of the chaotic Gaussian beam emitted by the non-polarizing beam splitter 103, and comprises a half-wave plate 201, a linear polarizer 202, a second plano-convex lens 203, a third plano-convex lens 204 and a reflective pure phase spatial light modulator 205 arranged in sequence, and the chaotic Bessel-Gaussian beam construction module is used to generate a l-order chaotic Bessel-Gaussian beam;

[0041] The chaotic Bessel-Gaussian beam self-healing and anti-turbulence characteristic verification module is located on the path of the l-order chaotic Bessel-Gaussian beam emitted by the reflective pure phase spatial light modulator 205, and includes an obstacle 301, a turbulent phase screen 302 and a second non-polarizing beam splitter 303 arranged in sequence. The second non-polarizing beam splitter 303 is used to split the l-order chaotic Bessel-Gaussian beam passing through the obstacle 301 and the turbulent phase screen 302, wherein one l-order chaotic Bessel-Gaussian beam is coupled to the photodetector 306 via the fifth plano-convex lens 305, and the output end of the photodetector 306 is connected to the oscilloscope 307, and the other l-order chaotic Bessel-Gaussian beam is coupled to the charge coupled element 309 via the 4f observation system composed of the fourth plano-convex lens 304 and the sixth plano-convex lens 308.

[0042] The generation of chaotic Bessel light is divided into the generation of chaotic laser and the use of spatial light modulator to perform spatial phase modulation on chaotic Gaussian light to obtain the l-order chaotic Bessel Gaussian beam. Then, obstacles and turbulent phase screens are set on the propagation path to simulate the real propagation environment.

[0043] Specifically, in the chaotic laser generation module, the laser 101 is a Fabry-Perot single-mode semiconductor laser with a central wavelength of 850 nm, the focal length of the first plano-convex lens 102 is 5 mm, and the first non-polarizing beam splitter 103 is a 50:50 non-polarizing beam splitter. In the chaotic Bessel-Gaussian beam construction module, the focal length of the second plano-convex lens 203 is 25 mm, and the focal length of the third plano-convex lens 204 is 75 mm. The second non-polarizing beam splitter 303 is a 50:50 non-polarizing beam splitter, the focal length of the fourth plano-convex lens 304 is 25 mm, the focal length of the fifth plano-convex lens 305 is 5 mm, and the focal length of the sixth plano-convex lens 308 is 25 mm.

[0044] The present invention also provides a method for generating a turbulence-resistant chaotic Bessel-Gaussian beam, comprising the following steps:

[0045] The laser 101 generates laser light, which is collimated by the first plano-convex lens 102, and then returns to the interior of the laser 101 after passing through the adjustable continuous light attenuation mirror 104 and the dielectric film reflector 105. Based on the disturbance of the light field, a chaotic Gaussian beam is generated.

[0046] The chaotic Gaussian beam is emitted from the first non-polarizing beam splitter 103, and the polarization state of the beam is adjusted by the half-wave plate 201 and the linear polarizer 202 to make it consistent with the working direction of the reflective pure phase spatial light modulator 205. The beam is expanded by the second plano-convex lens 203 and the third plano-convex lens 204 and propagated to the reflective pure phase spatial light modulator 205 loaded with a holographic phase image composed of a spiral phase superimposed with a radially distributed angular cone phase to obtain a l-order chaotic Bessel Gaussian beam;

[0047] The l-order chaotic Bessel-Gaussian beam passes through the obstacle 301 and the turbulent phase screen 302, and is split 50:50 by the second non-polarizing beam splitter 303. One of the l-order chaotic Bessel-Gaussian beams is coupled to the photodetector 306 by the fifth plano-convex lens 305, and the oscilloscope 307 is used to monitor whether the laser 101 is working in a chaotic state. The other l-order chaotic Bessel-Gaussian beam is coupled to the charge coupled element 309 via the fourth plano-convex lens 304 and the sixth plano-convex lens 308 to form a 4f observation system to observe the lateral light intensity distribution of the chaotic Bessel-Gaussian beam. On the propagation path, obstacles and turbulent phase screens are set up respectively to verify the self-healing and anti-turbulence robustness of the chaotic Bessel-Gaussian beam.

[0048] In this embodiment, the generation of chaotic semiconductor laser is due to the coupling of feedback light field and laser cavity light field, which destroys the balance between carriers and photons in the laser cavity, thereby causing unstable laser output. The laser output state depends on the feedback delay time and feedback intensity. Under appropriate feedback intensity, the laser can excite a chaotic state.

[0049] Diffraction-free (Bessel) beams are exact solutions to the wave equation in free space, so that they do not experience lateral expansion during propagation, that is, they maintain their intensity distribution during propagation. Bessel beams have infinitely expanded sidelobes, but this is unrealistic in reality. Usually, a Bessel-Gauss (BG) beam is used to generate an approximate Bessel beam, which is defined as:

[0050]

[0051] Where ω0 is the beam waist of the Gaussian beam that limits the BG beam. Indicates that its wavefront is a spiral wavefront, which means that the BG beam carries orbital angular momentum (OAM) Where l is an integer. When l=0, the field has The lateral intensity distribution of r and r is shown as a bright spot surrounded by concentric circles that gradually darken when projected onto the lateral plane. are the radial and azimuthal coordinates in the polar coordinate system, z is the axial propagation distance, k z is the transverse component of the wave vector cone of the Bessel beam, k r is the longitudinal component, so that k r 2 +k z 2 =k 2 , k is the wave number.

[0052] The complex amplitude expression of the chaotic Bessel-Gaussian beam can be derived as follows:

[0053]

[0054] Where A(t); exp(-iφ); exp(-iwt) are the field amplitude, phase and carrier related to time respectively.

[0055] After the generation of the l-order chaotic Bessel-Gaussian beam, it also includes the simulation and experimental verification of its self-healing characteristics;

[0056] The process of simulating the self-healing characteristics is as follows: extract the intensity and phase information of the chaotic laser at a time point to construct the field of the chaotic Bessel-Gaussian beam, use a blazed grating to simulate an opaque circular obstacle to block the light field at the source field, and use the angular spectrum method to perform Fresnel diffraction propagation to observe its self-healing characteristics on the propagation path;

[0057] The process of experimental verification is: using an opaque obstacle 301 to block the chaotic Bessel-Gaussian beam on the propagation path and observing its self-healing characteristics.

[0058] After the generation of the l-order chaotic Bessel-Gaussian beam, the robustness verification of the chaotic Bessel-Gaussian beam in a turbulent environment is also included:

[0059] The modified Von Karman spectrum model is used as the turbulence phase screen power spectrum density model, and multiple turbulence phase screens are placed on the propagation path to simulate the light field distortion and drift brought by the real environment, thereby causing random attenuation of the received optical power. The actual model is given by the following formula:

[0060]

[0061] where fm =5.92 / l0 and f0=2π / L0, l0 and L0 are the inner and outer scales respectively, f is the angular spatial frequency, is a refractive index structure parameter used to measure the local turbulence intensity. In the present invention, the light beam propagates along a horizontal path with a length of 300m. Moderate turbulence.

[0062] Figures 2 to 6 The timing, spectrum, light field and phase distribution diagram of chaotic Bessel-Gaussian beams carrying different orders of orbital angular momentum. It is precisely because the phase distribution of the special spiral structure of OAM ensures the orthogonality of different OAM beams that theoretically OAM multiplexing has infinite degrees of freedom in free space. Therefore, chaotic Bessel-Gaussian beams can not only improve the robustness of the beam but also provide additional degrees of freedom for the expansion of chaotic secure communications.

[0063] Figure 4 (a), (b), (c), and (d) are the lateral intensity distributions of 0-3 order chaotic Bessel-Gaussian beams captured experimentally;

[0064] Figure 5 (a), (b), (c), and (d) are the simulated lateral intensity distributions of chaotic Bessel-Gaussian beams of order 0-3 respectively;

[0065] Figure 6 (a), (b), (c), and (d) are the simulated phase distributions of 0-3 order chaotic Bessel-Gaussian beams respectively.

[0066] Figure 7 , Figure 8 The self-healing light field of a chaotic Bessel-Gaussian beam when there is an obstacle on the propagation path. After passing through the obstacle, the chaotic Bessel-Gaussian beam can still maintain a good phase wavefront and light intensity distribution.

[0067] Figure 7 (a), (b), and (c) are the self-healing light fields of the chaotic Bessel-Gaussian beam when it passes through an obstacle on the propagation path;

[0068] Figure 8 (a), (b), and (c) are the self-healing light fields of the chaotic Bessel-Gaussian beam when there are real obstacles on the propagation path in the experiment.

[0069] Fig. 9 , Fig.10 The light field distribution and power attenuation of a chaotic Bessel-Gaussian beam after passing through a turbulent phase screen. Compared with a chaotic Gaussian beam, a chaotic Bessel-Gaussian beam with non-diffraction characteristics has lower power attenuation and can obtain a more complete wavefront distribution on the receiving screen.

[0070] Fig.10 (b1) and (b2) are the light field distributions of chaotic Bessel-Gaussian beams at different propagation distances; (c1) and (c2) are the light field distributions of chaotic Gaussian beams at different propagation distances.

[0071] The feasibility of constructing chaotic Bessel-Gaussian beams is theoretically analyzed and experimentally verified, and its self-healing and anti-turbulence propagation characteristics are deeply studied. The excellent robustness of chaotic Bessel-Gaussian beams can serve as a strong candidate for future chaotic free-space optical secure communications.

[0072] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A device for generating a turbulence-resistant chaotic Bessel-Gaussian beam, characterized in that: It includes a chaotic laser generation module, a chaotic Bessel-Gaussian beam construction module, and a chaotic Bessel-Gaussian beam self-healing and anti-turbulence characteristic verification module; The chaotic laser generation module comprises a laser (101) and a first plano-convex lens (102), a first non-polarizing beam splitter (103), an adjustable continuous light attenuation mirror (104) and a dielectric film reflector (105) which are sequentially arranged along a laser emission path of the laser (101). The chaotic laser generation module is used to generate a chaotic Gaussian beam. The chaotic Bessel-Gaussian beam construction module is located on the path of the chaotic Gaussian beam emitted by the non-polarization beam splitter (103), and comprises a half-wave plate (201), a linear polarization plate (202), a second plano-convex lens (203), a third plano-convex lens (204) and a reflective pure phase spatial light modulator (205) which are arranged in sequence. The chaotic Bessel-Gaussian beam construction module is used to generate a l-order chaotic Bessel-Gaussian beam; The chaotic Bessel-Gaussian beam self-healing and anti-turbulence characteristic verification module is located on the path of a reflective pure phase spatial light modulator (205) emitting a l-order chaotic Bessel-Gaussian beam, and comprises an obstacle (301), a turbulent phase screen (302) and a second non-polarizing beam splitter (303) arranged in sequence, wherein the second non-polarizing beam splitter (303) is used to split the l-order chaotic Bessel-Gaussian beam passing through the obstacle (301) and the turbulent phase screen (302), wherein one l-order chaotic Bessel-Gaussian beam is coupled to a photodetector (306) via a fifth plano-convex lens (305), an output end of the photodetector (306) is connected to an oscilloscope (307), and another l-order chaotic Bessel-Gaussian beam is coupled to a charge coupled element (309) via a 4f observation system composed of a fourth plano-convex lens (304) and a sixth plano-convex lens (308).

2. The device for generating a turbulence-resistant chaotic Bessel-Gaussian beam according to claim 1, characterized in that: In the chaotic laser generation module, the laser (101) is a Fabry-Perot single-mode semiconductor laser with a central wavelength of 850 nm, the focal length of the first plano-convex lens (102) is 5 mm, and the first non-polarizing beam splitter (103) is a 50:50 non-polarizing beam splitter.

3. The device for generating a turbulence-resistant chaotic Bessel-Gaussian beam according to claim 1, characterized in that: In the construction module of the chaotic Bessel-Gaussian beam, the focal length of the second plano-convex lens (203) is 25 mm, and the focal length of the third plano-convex lens (204) is 75 mm.

4. The device for generating a turbulence-resistant chaotic Bessel-Gaussian beam according to claim 1, characterized in that: The second non-polarizing beam splitter (303) is a 50:50 non-polarizing beam splitter, the focal length of the fourth plano-convex lens (304) is 25 mm, the focal length of the fifth plano-convex lens (305) is 5 mm, and the focal length of the sixth plano-convex lens (308) is 25 mm.

5. A method for generating a turbulence-resistant chaotic Bessel-Gaussian beam, based on the device for generating a turbulence-resistant chaotic Bessel-Gaussian beam as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: The laser (101) generates laser light, which is collimated by a first plano-convex lens (102), and then returns to the interior of the laser (101) after passing through an adjustable continuous light attenuation mirror (104) and a dielectric film reflector (105), and a chaotic Gaussian beam is generated based on the disturbance of the light field; A chaotic Gaussian light beam is emitted from a first non-polarizing beam splitter (103), and the polarization state of the light beam is adjusted through a half-wave plate (201) and a linear polarizer (202) so that the light beam has the same working direction as a reflective pure phase spatial light modulator (205). The light beam is expanded through a second plano-convex lens (203) and a third plano-convex lens (204) and propagated to a reflective pure phase spatial light modulator (205) to obtain a first-order chaotic Bessel-Gaussian light beam. A holographic phase diagram consisting of a spiral phase superimposed on a radially distributed angular cone phase is loaded on the reflective pure phase spatial light modulator (205); The l-order chaotic Bessel-Gaussian beam passes through an obstacle (301) and a turbulent phase screen (302), and is split 50:50 by a second non-polarizing beam splitter (303). One of the l-order chaotic Bessel-Gaussian beams is coupled to a photodetector (306) by a fifth plano-convex lens (305), and an oscilloscope (307) is used to monitor whether the laser (101) is operating in a chaotic state. The other l-order chaotic Bessel-Gaussian beam is coupled to a charge coupled element (309) via a 4f observation system formed by a fourth plano-convex lens (304) and a sixth plano-convex lens (308), and the lateral light intensity distribution of the chaotic Bessel-Gaussian beam is observed.

6. The method for generating a turbulence-resistant chaotic Bessel-Gaussian beam according to claim 5, characterized in that: After the generation of the l-order chaotic Bessel-Gaussian beam, it also includes the simulation and experimental verification of its self-healing characteristics; The process of simulating the self-healing characteristics is as follows: extract the intensity and phase information of the chaotic laser at a time point to construct the field of the chaotic Bessel-Gaussian beam, use a blazed grating to simulate an opaque circular obstacle to block the light field at the source field, and use the angular spectrum method to perform Fresnel diffraction propagation to observe its self-healing characteristics on the propagation path; The process of experimental verification is: using an opaque obstacle (301) to block the chaotic Bessel-Gaussian beam on the propagation path, and observing its self-healing characteristics.

7. The method for generating a turbulence-resistant chaotic Bessel-Gaussian beam according to claim 5, characterized in that: After the generation of the l-order chaotic Bessel-Gaussian beam, the robustness verification of the chaotic Bessel-Gaussian beam in a turbulent environment is also included: The modified Von Karman spectrum model is used as the power spectrum density model of the turbulence phase screen, and multiple turbulence phase screens are placed on the propagation path to simulate the light field distortion and drift caused by the real environment. The actual model is given by the following formula: where f m =5.92 / l0 and f0=2π / L0, l0 and L0 are the inner and outer scales respectively, f is the angular spatial frequency, is the refractive index structure parameter used to measure the local turbulence intensity.

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