An equal-peak ring-shaped soliton beam forming device based on optical transmission film regulation and a method for regulating equal-peak ring-shaped soliton beams

Abstract

The application relates to an equal-peak annular soliton beam forming device based on optical transmission film regulation and an equal-peak annular soliton beam regulation method. The device comprises a first laser for emitting a first light beam; a first light beam modulation unit for converging the first light beam into a required radius after the first light beam is modulated to have a required spectral width and a required linear potential; a second laser for emitting a second light beam; a second light beam modulation unit for converging and reflecting the second light beam; a beam splitter for converging the modulated first light beam and the modulated second light beam again and forming a third converging light beam; a barium strontium niobate nonlinear crystal for forming an equal-peak annular soliton beam under the action of a nonlinear effect; and an optical imaging module for converging and imaging the equal-peak annular soliton beam. The application simplifies the principle, device and method for forming the equal-peak annular soliton beam and the structure of the nonlinear crystal, and improves the stability of the forming effect of the equal-peak annular soliton beam.

Description

Technical Field

[0001] The present invention relates to a beam forming technology, and in particular to an equal-peak annular soliton beam forming device based on optical transmission film regulation and a method for regulating the equal-peak annular soliton beam. Background Art

[0002] With the rapid development of optoelectronic technology, in order to meet people's various needs, various optoelectronic devices with different functions have come into people's field of vision. One of the core parts of these optoelectronic devices is the light source forming device, and its quality greatly affects the quality of the entire optoelectronic device system.

[0003] Traditional Gaussian laser beams, after long-distance propagation, suffer from significant diffraction or dispersion effects, leading to distortion of the Gaussian beam waveform. This problem is particularly critical for long-distance propagation of light sources. As soliton beam-forming devices have been gradually refined experimentally, various types of soliton beam-forming devices have gradually attracted significant attention. In practical scientific research or engineering applications, equipeak annular soliton beams, due to their unique light source shape, offer desirable applications in certain scenarios.

[0004] The current method for forming the equi-peak annular soliton beam is based on a non-uniform nonlinear control scheme modulated by the photorefractive effect. The specific steps of the photorefractive scheme are to intersect two beams of light at a desired angle in a medium, forming an interference pattern of light intensity in the medium through interference, resulting in a periodic distribution of light intensity perpendicular to the angle bisector of the two beams. This method is relatively difficult to implement, requiring the use of the photorefractive effect to precisely control the distribution structure of the nonlinear medium to form an equi-peak annular soliton beam.

[0005] The paper “Multiple-peak and multiple-ring solitons in the nonlinear equation with inhomogeneous self-defocusing nonlinearity" (L.Zeng,X.Zhu,MR D.Mihalache,J.Shi,and J.Chen.Multiple-peak and multiple-ringsolitons in the nonlinear equation with inhomogeneous self-defocusingnonlinearity, Nonlinear Dynamics 111(6),5671-5680(2023)) discloses the existence characteristics and stability characteristics of GS (ground state), dipole mode (first excited state) and higher-order modes of single-peak and multi-peak solitons in the framework of NLSE (nonlinear Schrödinger equation), but does not disclose the relevant characteristics of equal-peak soliton annular beams and the device and method for realizing equal-peak soliton annular beams. Summary of the Invention

[0006] In order to solve the problems existing in the above-mentioned prior art, the present invention aims to provide an equi-peak annular soliton beam forming device based on the regulation of an optical transmission film.

[0007] The present invention describes an equi-peak annular soliton beam forming device based on optical transmittance film regulation, comprising: a first laser for emitting a first light beam; a first light beam modulation unit for converging the first light beam to a desired radius after modulation so as to have a desired spectral width and a desired linear potential; a second laser for emitting a second light beam; a second light beam modulation unit for converging and reflecting the second light beam; a beam splitter for converging the modulated first light beam and the modulated second light beam again to form a third converging light beam; a barium strontium niobate nonlinear crystal for causing the third converging light beam to form an equi-peak annular soliton beam under the action of a nonlinear effect; and an optical imaging module for converging and imaging the equi-peak annular soliton beam; the radius of the first light beam is greater than or equal to the radius of the second light beam.

[0008] Preferably, the first light beam modulation unit comprises an optically transmissive film, and the optically transmissive film is a concentric gradient multi-ring linear lattice structure with equal ring width.

[0009] Preferably, the radius of the optically transmissive film is greater than or equal to the radius of the first light beam.

[0010] Preferably, the thickness of the optically transmissive film is expressed as s in 2 (kr), where r is the radial coordinate of the maximum radius of each cross section of the optically transmissive film in the Cartesian coordinates (x, y) corresponding to the polar coordinates (r, θ), s in 2 (kr) is the transmission coefficient of the ring structure of the optically transmissive film where r is located, and k is the modulation coefficient of the optically transmissive film.

[0011] Preferably, the first light beam modulation unit further includes a filtering and expanding device, a collimating device and a first converging device. The first light beam is first filtered by the filtering and expanding device and then expanded, and then collimated by the collimating device and incident on the optically transparent film to form the required linear potential, and finally converged by the first converging device and incident on the beam splitter.

[0012] Preferably, the second beam modulation unit includes a variable iris, a second converging device and a reflecting device. The radius of the second beam is first adjusted by the variable iris, and then converged to the reflecting device by the second converging device, and then reflected to the beam splitter by the reflecting device.

[0013] Preferably, the first laser is a neodymium-doped yttrium aluminum garnet solid-state laser, and the second laser is a helium-neon laser.

[0014] Preferably, the central wavelength of the first laser is 532 nm, and the central wavelength of the second laser is 633 nm.

[0015] Preferably, the optical imaging module comprises a third converging device and a CCD, and the equi-peak annular soliton beam is imaged on the CCD after being converged by the third converging device.

[0016] The present invention also provides a method for controlling an equi-peak annular soliton beam of the optically transmissive film-controlled equi-peak annular soliton beam forming device in the above-mentioned technical solution, comprising the following steps: step 1, the first laser emits the first light beam, which is modulated into a suitable radius by the first light beam modulation unit, and the modulated first light beam is given a required linear potential by the optically transmissive film in the first light beam modulation unit, and is incident on the beam splitter after convergence; step 2, performed simultaneously with step 1 or after step 1, the second laser emits the second light beam, which is modulated into a suitable radius by the second light beam modulation unit, and is reflected into the beam splitter after convergence; step 3, the modulated first light beam and the modulated second light beam are combined into the third converging light beam in the beam splitter, and the equi-peak annular soliton beam is formed by the action of the barium strontium niobate nonlinear crystal; step 4, the equi-peak annular soliton beam is imaged on the CCD after convergence by the third converging device;

[0017] The relationship between the radius R of the second light beam, the modulation coefficient k of the optical transmission film and the peak number N of the equi-peak annular soliton beam is N=floor(kR / π), where floor is a floor function and π is pi.

[0018] Beneficial effects

[0019] The advantages of the present invention's device and method for forming an equi-peak annular soliton beam based on optically transmissive film regulation are that, due to the use of a modulatable optically transmissive film, the annular portion of the nonlinear Schrödinger equation of the equi-peak annular soliton beam is realized using a linear annular structure in the optically transmissive film, and the equi-peak annular soliton beam is localized through this annular structure. This eliminates the need to control the distribution structure of a nonlinear medium (e.g., a nonlinear crystal, hereinafter the same) to achieve this function. This simplifies the principle, device, and method for forming the equi-peak annular soliton beam, as well as the structure of the barium strontium niobate nonlinear crystal, and improves the stability of the formation effect of the equi-peak annular soliton beam. Conventional devices and corresponding methods for forming the equi-peak annular soliton beam based on the photorefractive effect require the use of the photorefractive effect to precisely control the distribution structure of the nonlinear medium to form the equi-peak annular soliton beam. Consequently, the devices are complex, the methods involve numerous steps, and the formation effect is generally unstable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of an equi-peak annular soliton beam forming device based on optical transmission film regulation according to the present invention;

[0021] Figure 2 This is the numerical calculation result of the equi-peak annular soliton beam described in the present invention.

[0022] Description of reference numerals:

[0023] 100 first laser 110 first light beam 120 first light beam modulation

[0024] Control unit 121 optical transmission film 122 filter beam expander 123 collimation device

[0025] 124 first concentrator 200 second laser 210 second light beam

[0026] pieces

[0027] 220 Second beam adjuster 221 Variable aperture 222 Second converging device unit 223 Reflection device 300 Beam splitter 310 Third converging light

[0028] Beam 400, barium niobate 410, iso-peak ring 500, optical imaging mode, strontium nonlinear crystal soliton beam block

[0029] body

[0030] 510 third converger 520CCD

[0031] pieces DETAILED DESCRIPTION

[0032] like Figure 1As shown, the present invention describes an equi-peak annular soliton beam forming device based on optical transmittance film regulation, comprising: a first laser 100 for emitting a first light beam 110; a first light beam modulation unit 120 for converging the first light beam 110 to a desired radius after modulation so as to have a desired spectral width and a desired linear potential; a second laser 200 for emitting a second light beam 210; a second light beam modulation unit 220 for converging and reflecting the second light beam 210; a beam splitter 300 for converging the modulated first light beam 110 and the modulated second light beam 210 again to form a third converging light beam 310; a barium strontium niobate nonlinear crystal 400 for forming the third converging light beam 310 into an equi-peak annular soliton beam under the action of a nonlinear effect; an optical imaging module 500 for converging and imaging the equi-peak annular soliton beam; the radius of the first light beam 110 is greater than or equal to the radius of the second light beam 210.

[0033] In some embodiments, the first light beam 110 emitted by the first laser 100 is modulated by the first light beam modulation unit 120 and then enters the beam splitter 300 . The first beam modulation unit 120 needs to make the first beam have the required spectral width. For example, this can be achieved by using filtering and beam expansion methods. The relevant devices can adopt devices in the prior art. Those skilled in the art can select devices with beam expansion and filtering functions or both beam expansion and filtering functions in the prior art according to actual needs; it is also necessary to make the first beam have the required linear potential. For example, the above functions can be achieved by using a device with a gradient annular linear lattice in the prior art. Those skilled in the art can select a device with a gradient multi-ring linear lattice in the prior art according to actual needs. Since collimation is required after beam expansion to make the first beam uniformly incident on the device with the gradient annular linear lattice and to make the linear potential applied to the first beam according to the distribution of the gradient annular linear lattice, it is necessary to select a device with a collimation function in the prior art. Those skilled in the art can select a device with a collimation function in the prior art according to actual needs; it is also necessary to make the first beam converge to the required radius. It is necessary to use a device with a convergence function in the prior art. Those skilled in the art can select a device with a convergence function in the prior art according to actual needs. The second light beam 210 emitted by the second laser 200 is converged into a certain radius by the second light beam modulation unit 220, and then reflected into the beam splitter 300. The beam splitter 300 adopts the beam splitter in the prior art, and those skilled in the art can select the beam splitter in the prior art according to actual needs. The beam splitter 300 has a semi-reflective and semi-transparent device, for example, it can be a semi-reflective and semi-transparent lens. The modulated first light beam 110 and the modulated second light beam 210 are combined into the third converging light beam 310. Specifically, the modulated first light beam 110 passes through the semi-reflective and semi-transparent device in the beam splitter 300 and is combined with the modulated second light beam 210 that enters the beam splitter 300 and is reflected from the surface of the semi-reflective and semi-transparent device. Then, the third converging light beam 310 is incident on the barium strontium niobate nonlinear crystal 400, and under the action of the barium strontium niobate nonlinear crystal 400, the equi-peak annular soliton beam is formed. The equi-peak annular soliton beam is converged on the optical imaging module 500 and then imaged. For example, the optical imaging module 500 may include a converging device and an imaging device, and the converging device is used to converge the equi-peak annular soliton beam onto the imaging device. The converging device can be a converging device in the prior art, and those skilled in the art can select a converging device in the prior art according to actual needs. The imaging device can be an imaging device in the prior art, and those skilled in the art can select a imaging device in the prior art according to actual needs.In order to ensure the modulation effect, the radius of the first light beam 110 needs to be greater than or equal to the radius of the second light beam 210 to achieve matching of the beam radiuses.

[0034] In some preferred embodiments, the first light beam modulation unit 120 includes an optically transparent film 121 , and the optically transparent film 121 is a concentric gradient multi-ring linear lattice structure with equal ring width.

[0035] In some preferred embodiments, the radius of the optically transparent film 121 is greater than or equal to the radius of the first light beam 210 .

[0036] In some embodiments, the optically transmissive film 121 may be an optically transmissive film in the prior art, and those skilled in the art may customize the optically transmissive film in the prior art according to actual needs.

[0037] In some preferred embodiments, the thickness of the optically transmissive film 121 is expressed as s in 2 (kr), where r is the radial coordinate of the maximum radius of each cross section of the optically transmissive film in the Cartesian coordinates (x, y) corresponding to the polar coordinates (r, θ), s in 2 (kr) is the transmission coefficient of the ring structure of the optically transmissive film at position r, and k is the modulation coefficient of the optically transmissive film. Specifically, the optically transmissive film 121 can be customized to have a specific number of rings capable of outputting soliton beams. The number of rings is not limited, and can be, for example, 1-5 rings.

[0038] Preferably, the first light beam modulation unit 120 also includes a filtering and expanding device 122, a collimating device 123 and a first converging device 124. The first light beam 110 is first filtered by the filtering and expanding device 122 and then expanded, and then collimated by the collimating device 123 and incident on the optical transparent film 121 to form the required linear potential, and finally converged by the first converging device 124 and incident on the beam splitter 300.

[0039] In some embodiments, the filtering and expanding device 122 may be composed of a convex lens and a filter. For example, the filter is a spatial filter. The convex lens may be installed inside the filter to expand the first light beam 110. The filter is used to filter the first light beam 110 after the expansion process. The collimating device 123 may be a convex lens. After the first light beam 110 is collimated by the convex lens, it is incident on the device having the annular linear lattice to have the desired linear potential. For example, the device having the annular linear lattice may be an optically transparent film having an annular linear lattice. Specifically, it may be the optically transparent film 121. The first converging device 124 is used to converge the first light beam 110 after the linear potential is applied and to allow the first light beam 110 to be incident on the beam splitter 300. The first converging device 124 may be a convex lens.

[0040] Preferably, the second beam modulation unit 220 includes a variable aperture 221, a second converging device 222 and a reflecting device 223. The radius of the second beam 210 is first adjusted by the variable aperture 221, and then converged to the reflecting device 223 by the second converging device 222, and reflected by the reflecting device 223 to the beam splitter 300.

[0041] In some embodiments, the variable iris 221 can be a variable iris used in the prior art to adjust the radius of a light beam incident on the variable iris. Those skilled in the art can select a variable iris from the prior art based on actual needs. The second converging device 222 can be a convex lens, and the reflecting device 223 can be a plane mirror, both of which are used to guide the second light beam 210 to enter the beam splitter 300.

[0042] Preferably, the first laser 100 is a Nd:YAG solid-state laser, and the second laser 200 is a He:Ne laser.

[0043] In some preferred embodiments, according to the central wavelength and spectral width of the first light beam 110 emitted by the first laser 100, and the central wavelength and spectral width of the second light beam 210 emitted by the second laser 200, the formation of the equi-peak annular soliton beam of 1-5 rings can be achieved by adjusting parameters based on the above-mentioned optical path. The specific relationship is as follows: N = floor (kR / π), where floor is a floor rounding function, π is pi, and k is a modulation coefficient.

[0044] Preferably, the central wavelength of the first laser 100 is 532 nm, and the central wavelength of the second laser 200 is 633 nm.

[0045] In some preferred embodiments, as long as the first laser 100 and the second laser 200 meet the requirements of their respective central wavelengths and have a spectral width of 10 -3 The working materials for generating the laser wavelengths of the first laser 100 and the second laser 200 are not limited.

[0046] Preferably, the optical imaging module 500 includes a third converging device 510 and a CCD 520 , and the equi-peak annular soliton beam passing through the barium strontium niobate nonlinear crystal 400 is converged by the third converging device 510 and then imaged on the CCD 520 .

[0047] In some preferred embodiments, the third converging device 510 may be a convex lens, and the CCD 520 may convert the optical image into a digital signal and output it. A CCD in the prior art may be used, and those skilled in the art may select a CCD in the prior art according to actual needs.

[0048] The present invention further provides a method for controlling an equi-peak annular soliton beam using the equi-peak annular soliton beam forming device controlled by the optically transmissive film according to the above technical solution, comprising the following steps:

[0049] Step 1: The first laser 100 emits the first light beam 110, which is modulated into a suitable radius by the first beam modulator 120 and passes through the optically transparent film 121 in the first beam modulator 120 so that the modulated first light beam 110 has a desired linear potential. The first light beam 110 is then converged and incident on the beam splitter 300.

[0050] Step 2, performed simultaneously with or after step 1, the second laser 200 emits the second light beam 210, which is modulated into a suitable radius by the second light beam modulation unit 220, converges, and then reflects into the beam splitter 300;

[0051] Step 3: The modulated first light beam 110 and the modulated second light beam 210 are combined into the third converging light beam 310 in the beam splitter 300, and the third converging light beam 310 is formed into the equal-peak annular soliton beam through the action of the barium strontium niobate nonlinear crystal 400;

[0052] Step 4: the equi-peak annular soliton beam passing through the barium strontium niobate nonlinear crystal 400 is converged by a third converging device 510 and then displayed on a CCD 520;

[0053] The parameter relationship between the radius R of the second light beam, the modulation coefficient k of the optically transmissive film, and the ring number N of the equi-peak annular soliton beam is N=floor(kR / π), where floor is a floor function and π is pi.

[0054] Using the above-mentioned control method, on the premise of determining the modulation coefficient of the optically transparent film 121 and the radius of the second light beam 210, the number of rings of the equal-peak annular soliton beam is output through the relationship N=floor(kR / π), and the number of rings can be 1 to 5.

[0055] Figure 2 is the numerical calculation result of the equi-peak annular soliton beam described in the present invention, and the calculation steps are as follows:

[0056] First, the modulation coefficient k of the optical transmission film is set to 2, the intensity coefficient V0 is set to 16, the normalized radius of the incident light beam is set to R = 5.5, and the propagation constant is set to -7. After substituting the above parameters into the nonlinear Schrödinger equation (steady-state equation) that is independent of the propagation distance, the squared-operator iterative algorithm (squared-operator method) written in MATLAB software can be obtained. Figure 2 results.

[0057] The equi-peak annular soliton beam described in the present invention can be described by the following nonlinear Schrödinger equation:

[0058]

[0059] Let E = Uexp(ibz), and substitute into the above formula to get the steady-state equation at the initial moment as follows:

[0060]

[0061] In the above equations describing the present invention, U is the steady state at the initial moment, b is the propagation constant, and the expression of V is V=V0s in 2 (kr), which reflects the effect of localizing the circular soliton beam through the linear ring lattice generated by the optically transparent film 121. It should be noted that according to the above calculation method, after appropriate calculation, s in 2 (kr) value, and thus the modulation coefficient k is deduced. The k value can affect the loop width but does not affect the output isoloop shape. And at this time, the strength of the nonlinearity is set to a constant, that is, g2 = constant. In the prior art, there is no VE term, g2 = s in 2(r). Whether in the prior art or in the present invention, g2 is a parameter of nonlinear intensity. Since g2 in the prior art includes a periodic annular part, in order to form the equi-peak annular soliton beam, the adjustment of the nonlinear intensity is more complicated, and it is necessary to take into account the adjustment of the nonlinear part and the periodic annular part. In the present invention, the periodic annular part is split out through the clever design of the optical path, and the periodic annular part is mainly adjusted separately by a device containing an annular linear lattice such as an optical transmission film, and the nonlinear part is adjusted by the barium strontium niobate nonlinear crystal, which simplifies the principle, device and method for forming the equi-peak annular soliton beam and the structure of the barium strontium niobate nonlinear crystal, and improves the stability of the formation effect of the equi-peak annular soliton beam.

[0062] The technical solutions of the present invention are further illustrated below through specific examples.

[0063] Example 1

[0064] A device for forming an equal-peak annular soliton beam based on optical transmission film regulation includes: a first laser 100, which is a solid-state laser doped with neodymium yttrium aluminum garnet and has a central wavelength of 532nm, and is used to emit a first light beam 110; a first light beam modulation unit 120, which includes an optical transmission film 121, a filter beam expander 122, a collimator 123, and a first converging device 124. The optical transmission film 121 is a concentric gradient multi-ring linear lattice structure with equal ring width, specifically, the number of rings is 3. The radius of the optical transmission film 121 is greater than the radius of the first light beam 110, and the thickness of the optical transmission film 121 is expressed as s in 2 (kr), where r is the radial coordinate of the maximum radius of each cross section of the optically transmissive film in the Cartesian coordinates (x, y) corresponding to the polar coordinates (r, θ), s in 2(kr) is the transmission coefficient of the ring structure of the optical transmissive film where r is located, k is the modulation coefficient of the optical transmissive film, the first light beam 110 is first filtered by the filter and beam expander 122 and then expanded, and then collimated by the collimator 123 and incident on the optical transmissive film 121 to form the required linear potential, and finally converged by the first converging device 124 and incident on the beam splitter 300; the second laser 200 is a helium-neon laser with a central wavelength of 633nm, which is used to emit the second light beam 210; the second light beam modulation unit 220 includes a variable aperture 221, a second converging device 222 and a reflector The second light beam 210 is first adjusted in radius by the variable iris 221, then converged onto the reflector 223 by the second converging device 222, and reflected by the reflector 223 to the beam splitter 300; the beam splitter 300 is used to converge the modulated first light beam 110 and the modulated second light beam 210 again to form a third converging light beam 310; the barium strontium niobate nonlinear crystal 400 is used to form the third converging light beam 310 into an equi-peak annular soliton beam under the action of the nonlinear effect; the optical imaging module 500 includes a third converging device 510 and a CCD 520, and the equi-peak annular soliton beam passing through the barium strontium niobate nonlinear crystal 400 is converged by the third converging device 510 and then displayed on the CCD 520; the radius of the first light beam 110 is equal to the radius of the second light beam 210.

[0065] Example 2

[0066] The device in Example 1 is used to emit an equipeak annular soliton beam using the following steps:

[0067] Step 1: The first laser 100 emits the first light beam 110, which is modulated into a suitable radius by the first beam modulator 120 and passes through the optically transparent film 121 in the first beam modulator 120 so that the modulated first light beam 110 has a desired linear potential. The first light beam 110 is then converged and incident on the beam splitter 300.

[0068] At the same time as step 1, step 2 is performed: the second laser 200 emits the second light beam 210, which is modulated into a suitable radius by the second light beam modulation unit 220, converges and then reflects into the beam splitter 300;

[0069] Step 3: The modulated first light beam 110 and the modulated second light beam 210 are combined into the third converging light beam 310 in the beam splitter 300, and the third converging light beam 310 is formed into the equal-peak annular soliton beam through the action of the barium strontium niobate nonlinear crystal 400;

[0070] Step 4: the equi-peak annular soliton beam passing through the barium strontium niobate nonlinear crystal 400 is converged by a third converging device 510 and then displayed on a CCD 520 .

[0071] Example 3

[0072] The following calculation method is used to calculate the equal-peak annular soliton beam emitted by the device of Example 1 using the method of Example 2, and the following calculation method is used to obtain Figure 2 result:

[0073] First, the modulation coefficient k of the optical transmission film is set to 2, the intensity coefficient V0 is set to 16, the normalized radius of the incident light beam is set to R = 5.5, and the propagation constant is set to -7. After substituting the above parameters into the nonlinear Schrödinger equation (steady-state equation) that is independent of the propagation distance, the squared-operator iterative algorithm (squared-operator method) written in MATLAB software can be obtained. Figure 2 results.

[0074] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention.

[0075] Those skilled in the art can make various other corresponding changes and deformations based on the technical solutions and concepts described above, and all of these changes and deformations should fall within the scope of protection of the claims of the present invention.

Claims

1. A device for forming an equi-peak annular soliton beam based on optical transmission film regulation, characterized in that: include: A first laser (100) for emitting a first light beam (110); A first light beam modulation unit (120) is used to converge the first light beam (110) to a desired radius after modulation to have a desired spectral width and a desired linear potential; the first light beam modulation unit (120) comprises an optical transmission film (121); a second laser (200) for emitting a second light beam (210); a second light beam modulation unit (220), configured to converge and reflect the second light beam (210); A beam splitter (300) configured to converge the modulated first light beam (110) and the modulated second light beam (210) again to form a third convergent light beam (310); The barium strontium niobate nonlinear crystal (400) is used to enable the third converging light beam (310) to form an equi-peak annular soliton beam under the action of a nonlinear effect; An optical imaging module (500) for converging and imaging the equal-peak annular soliton beam; The radius of the first light beam (110) is greater than or equal to the radius of the second light beam (210).

2. The device for forming an equi-peak annular soliton beam based on optical transmission film control according to claim 1, characterized in that: The optical transmission film (121) is a concentric gradient multi-ring linear lattice structure with equal ring width.

3. The device for forming an equi-peak annular soliton beam based on optical transmission film control according to claim 2, characterized in that: The radius of the optically transmissive film (121) is greater than or equal to the radius of the first light beam (110).

4. The device for forming an equi-peak annular soliton beam based on optical transmission film control according to claim 3, characterized in that: The thickness expression of the optically transmissive film is sin 2 (kr), where r is the radial coordinate of the maximum radius of each annular structure of the optically transmissive film in the polar coordinates (r, θ) corresponding to the Cartesian coordinates (x, y), sin 2 (kr) is the transmission coefficient of the ring structure of the optically transmissive film where r is located, and k is the modulation coefficient of the optically transmissive film.

5. The device for forming an equi-peak annular soliton beam based on optical transmission film control according to claim 1, characterized in that: The first light beam modulation unit (120) further includes a filtering and expanding device (122), a collimating device (123) and a first converging device (124). The first light beam (110) is first filtered by the filtering and expanding device (122) and then expanded. The first light beam (110) is then collimated by the collimating device (123) and then incident on the optical transmission film (121) to form a required linear potential. Finally, the first light beam is converged by the first converging device (124) and incident on the beam splitter (300).

6. The device for forming an equi-peak annular soliton beam based on optical transmission film control according to claim 1, characterized in that: The second light beam modulation unit (220) comprises a variable iris (221), a second converging device (222) and a reflecting device (223); the second light beam (210) is firstly adjusted in radius by the variable iris (221), then converged onto the reflecting device (223) by the second converging device (222), and then reflected by the reflecting device (223) to the beam splitter (300).

7. The device for forming an equi-peak annular soliton beam based on optical transmission film control according to claim 1, characterized in that: The first laser (100) is a neodymium-doped yttrium aluminum garnet solid laser, and the second laser (200) is a helium-neon laser.

8. The device for forming an equi-peak annular soliton beam based on optical transmission film control according to claim 1, characterized in that: The central wavelength of the first laser (100) is 532 nm, and the central wavelength of the second laser (200) is 633 nm.

9. The device for forming an equi-peak annular soliton beam based on optical transmission film control according to claim 1, characterized in that: The optical imaging module (500) comprises a third converging device (510) and a CCD (520); the equi-peak annular soliton beam (410) is converged by the third converging device (510) and then imaged on the CCD (520).

10. A method for controlling an equipeak annular soliton beam using the device according to any one of claims 1 to 9, characterized in that: The steps include: Step 1: the first laser (100) emits the first light beam (110), which is modulated into a suitable radius by the first light beam modulation unit (120) and passes through the optical transmission film (121) in the first light beam modulation unit (120) so that the modulated first light beam (110) has a required linear potential, and is then incident on the beam splitter (300) after converging. Step 2, performed simultaneously with or after step 1, the second laser (200) emits the second light beam (210), which is modulated into a suitable radius by the second light beam modulation unit (220), converges, and then reflects into the beam splitter (300); Step three, the modulated first light beam (110) and the modulated second light beam (210) are combined in the beam splitter (300) to form the third converging light beam (310), and the equi-peak annular soliton beam (410) is formed through the action of the barium strontium niobate nonlinear crystal (400); Step 4: the equi-peak annular soliton beam (410) is converged by the third converging device (510) and then displayed on a CCD (520); The relationship between the radius R of the second light beam, the modulation coefficient k of the optically transmissive film and the peak number N of the equi-peak annular soliton beam is N=floor(kR / π), where floor is a floor function and π is pi.

Images