Method, system and laser device for the treatment of incident laser for thermonuclear fusion

Abstract

The application discloses a method and system for processing incident laser for thermonuclear fusion and a laser device. The method comprises the following steps: receiving initial incident laser from the laser device; and performing angular momentum decoherence processing on the initial incident laser to obtain target incident laser for injection into a black cavity of thermonuclear fusion. The technical scheme in the application can reduce laser plasma instability and improve laser absorption efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of energy, in particular to a method and system for processing incident laser for thermonuclear fusion and a laser device. BACKGROUND

[0002] In laser-driven inertial confinement fusion (thermonuclear fusion for short), laser is injected into the high-Z (high atomic number) material hohlraum cavity wall through an injection hole and is converted into X-ray, and the X-ray radiation drives and compresses the spherical deuterium-tritium target pellet located in the center of the hohlraum to achieve implosion and fusion ignition.

[0003] In thermonuclear fusion, the laser energy injected into the hohlraum is first absorbed by the hohlraum cavity wall through laser-plasma interaction, and then can be converted into the driving X-ray required for target implosion by the cavity wall plasma. Therefore, laser absorption is the first important physical link of energy coupling, is crucial to energy efficiency, and is a basic problem in fusion ignition research. Then, since the hohlraum is not a vacuum, it contains plasma ablated from the high-Z material cavity wall and low-Z gas filled in the hohlraum to suppress the motion of the spot plasma. When the laser injected into the hohlraum passes through these plasmas, laser-plasma instability occurs.

[0004] During the process of laser injection into the hohlraum, part of the injected laser will be scattered out of the hohlraum due to laser-plasma instability and other problems, which will seriously reduce the laser absorption efficiency, thereby reducing the laser-X-ray radiation conversion efficiency, and also greatly affecting the uniformity of the radiation drive field of the driven ignition target pellet. The more serious the laser-plasma instability, the higher the proportion of laser reflected back, the lower the laser absorption efficiency, and the worse the target irradiation uniformity. Therefore, how to suppress laser-plasma instability is a great challenge faced by thermonuclear fusion ignition. SUMMARY

[0005] Therefore, in the embodiments of the present application, on the one hand, a method for processing incident laser for thermonuclear fusion is provided, and on the other hand, a system for processing incident laser for thermonuclear fusion and a laser device are provided, so as to reduce laser-plasma instability and improve laser absorption efficiency.

[0006] The method for processing incident laser for thermonuclear fusion provided in the embodiments of the present application comprises: receiving initial incident laser from a laser device; and performing angular momentum decoherence processing on the initial incident laser to obtain target incident laser for injection into a thermonuclear fusion hohlraum.

[0007] In one embodiment, the angular momentum decoherence processing of the initial incident laser includes: for each sub-laser beam in the initial incident laser, converting it into a sub-laser beam with a different topological charge number than other sub-laser beams by using a phase plate; and synthesizing each sub-laser beam with a different topological charge number into a spring light, and the spring light is used as the target incident laser for injection into the hot-nuclear fusion black cavity.

[0008] In one embodiment, the sub-laser beams with different topological charge numbers are sub-laser beams with an arithmetic progression distribution of topological charge numbers.

[0009] In one embodiment, the initial incident laser includes sub-laser beams with the same frequency and the same relative phase; and the target incident laser is a spring light with a narrow frequency band, a long pitch, and one strong spot with a position not changing over time.

[0010] In one embodiment, the initial incident laser includes sub-laser beams with an arithmetic progression distribution of frequency and the same relative phase after time decoherence; and the target incident laser is a spring light with a wide frequency band, a short pitch, and one strong spot with a position changing over time.

[0011] In one embodiment, the initial incident laser includes sub-laser beams with an arithmetic progression distribution of frequency and a random distribution of relative phase after time and spatial decoherence; and the target incident laser is a super spring light with a plurality of strong spots with positions changing over time.

[0012] The laser device provided in the embodiment of the present application includes: a laser device main body configured to provide initial incident laser for injection into a hot-nuclear fusion black cavity; and an angular momentum decoherence component configured to perform angular momentum decoherence processing on the initial incident laser to obtain target incident laser for injection into the hot-nuclear fusion black cavity.

[0013] In one embodiment, the angular momentum decoherence component includes: a phase plate support; and a plurality of phase plates arranged on the phase plate support, one phase plate corresponding to one sub-laser beam in the initial incident laser, and configured to convert the corresponding sub-laser beam into a sub-laser beam with a different topological charge number than other sub-laser beams, so that each sub-laser beam with a different topological charge number is synthesized into a spring light, and the spring light is the target incident laser for injection into the hot-nuclear fusion black cavity.

[0014] The incident laser processing system for hot-nuclear fusion provided in the embodiment of the present application includes: a laser device configured to provide initial incident laser for injection into a hot-nuclear fusion black cavity; and an angular momentum decoherence device configured to perform angular momentum decoherence processing on the initial incident laser to obtain target incident laser for injection into the hot-nuclear fusion black cavity.

[0015] In one embodiment, the angular momentum decoherence device comprises: a phase plate holder; and a plurality of phase plates arranged on the phase plate holder, one phase plate corresponding to one of the sub laser beams in the initial incident laser, for converting its corresponding sub laser beam into a sub laser beam with a different topological charge from other sub laser beams, so that each sub laser beam with a different topological charge is synthesized into a spring light, i.e. the target incident laser for injection into the hot-nuclear fusion black hole.

[0016] As can be seen from the above solutions, in the embodiments of the present application, since the incident laser is subjected to angular momentum decoherence, the laser plasma instability can be reduced, and the laser absorption efficiency can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] The preferred embodiments of the present application will be described in detail below with reference to the accompanying drawings, so that the above and other features and advantages of the present application can be more clearly understood by those skilled in the art.

[0018] Figure 1A A distribution diagram of the distribution of the spring light in the two-dimensional k-space.

[0019] Figure 1B A distribution diagram of the distribution of the Laguerre-Gaussian light in the two-dimensional k-space.

[0020] Figure 2 A distribution diagram of the spring light (l L0 ε2≠0) and the Laguerre-Gaussian light (l L0 ε2=0) in the two-dimensional k-space.

[0021] Figure 3 A diagram of the evolution of the SRS scattering share (the ratio of the scattered energy to the incident laser energy) of the spring light (l

[0022] Figure 4 An exemplary flowchart of the incident laser processing method for hot-nuclear fusion in the embodiments of the present application.

[0023] Figure 5 A diagram of the synthesis of the spring light from a plurality of sub laser beams with different topological charges in the embodiments of the present application.

[0024] Figure 6 A structural diagram of one phase plate in the embodiments of the present application.

[0025] Figure 7 An exemplary structural diagram of a laser device in the embodiments of the present application.

[0026] Figure 8 An exemplary structural diagram of an incident laser processing system for thermonuclear fusion in embodiments of the present application. DETAILED DESCRIPTION

[0027] In embodiments of the present application, it is considered that laser plasma instabilities caused by laser stimulated scattering in thermonuclear fusion not only result in scattering of laser out of the hohlraum, affecting laser absorption efficiency, but also superhot electrons generated thereby preheat the target pellet, seriously endangering ignition, and therefore must be inhibited or even eliminated.

[0028] The process of laser stimulated scattering mainly includes stimulated Brillouin scattering, stimulated Raman scattering (SRS), and two-plasmon decay. Taking SRS as an example, the hazards and influencing factors of laser plasma instabilities are analyzed below.

[0029] When laser is transmitted in a dilute plasma, the distribution of electron density is disturbed by the ponderomotive force and electron plasma waves are excited, and corresponding scattered light is excited due to energy conservation and momentum conservation, which is called stimulated Raman scattering (SRS). It is called "stimulated" because the parametric instability in the scattering process leads to positive feedback, and the intensity of the scattered light continues to strengthen under continuous excitation until saturation. SRS converts part of the laser energy into electron plasma waves, and the electron plasma waves heat the plasma in the process of decay and can produce superhot electrons. These superhot electrons preheat the inside of the fusion target pellet, endanger quasi-isentropic compression, and lead to ignition failure. At the same time, back SRS scattering causes part of the laser to be reflected out of the hohlraum, resulting in energy waste. In full-scale thermonuclear fusion, the focal depth of the laser is long, i.e., the Rayleigh length is long, and the instability process can grow continuously over a long laser propagation distance, causing greater harm.

[0030] In the process of stimulated Raman scattering, the three waves of incident laser, electron plasma wave, and SRS scattered light satisfy energy conservation and momentum conservation, i.e.,

[0031] ω L = ω e + ω S (1)

[0032] k L = k e + k S (2)

[0033] wherein ω L , k L are the frequency and wave number of the incident laser, respectively; ω e , ke respectively, are the frequency and wave number of the electron plasma wave; ω S , k S respectively, are the frequency and wave number of the SRS scattered light.

[0034] As can be seen from equations (1) and (2), only the modes of the incident laser that satisfy the matching condition can resonate with the electron plasma wave and the SRS scattered wave, and can make the largest contribution to the growth of the laser plasma instability, while those modes that do not satisfy the matching condition make little contribution to the growth rate of the instability. Therefore, eliminating the coherence of the incident laser can reduce the proportion of the laser that satisfies the matching condition, and thus reduce the growth rate of the laser plasma instability.

[0035] As can be seen from the matching relationship of equations (1) and (2), the methods of temporal decoherence and spatial decoherence can be used. The methods of using temporal decoherence and spatial decoherence to suppress the laser plasma instability have been widely used in the research of thermonuclear fusion.

[0036] In fact, in addition to the frequency and wave number, the wave also contains the parameter of angular momentum, and the three waves should also satisfy the conservation of angular momentum, i.e.:

[0037] L L = L e + L S (3)

[0038] Here, L L , L e , L S are the angular momenta of the incident laser, the electron plasma wave and the SRS scattered wave, respectively. Similarly, the method of angular momentum decoherence can also be used to suppress the laser plasma instability. In the following, the physical idea of suppressing the laser plasma instability based on reducing or removing the angular momentum coherence is described.

[0039] In the following, the method is taken as an example for linearly polarized laser, which can be extended to the case of circularly polarized laser. Assuming that the incident laser propagates along the x direction, and the Laguerre-Gaussian mode is used, the amplitude of the incident laser at position x and time t can be expressed as:

[0040]

[0041] where, is the spatial distribution shape of the incident laser in the transverse plane perpendicular to the propagation direction. Here, C pl is a normalization constant, is the associated Laguerre polynomial, p is the node of the amplitude distribution in the radial direction, k L = 2π / λL , λ L is the incident laser wavelength, w0is the waist radius, l L is the topological charge number, φ is the initial phase on the waist plane. Since we are mainly concerned with the angular momentum non-correlation effect, we take p≡0.

[0042] Consider the case that the incident laser is superposition of N modes. Let the frequency, wave number, topological charge number and initial phase of the nth mode be ω Ln , k Ln , l Ln and φ n (n = 1,..., N), respectively, then the incident laser can be written as:

[0043]

[0044] For simplicity, take a n ≡ a0, φ n ≡ 0, and for frequency, take ω Ln = ω1+ ω L0 (n-1)ε1, then ω L0 = ω1is the center frequency, the frequency of the first mode is ω L1 , the frequency interval between different modes is ω L0 ε1, and the total frequency bandwidth Δω = (N-1)ω L0 ε1, where ε1is a constant determining the frequency bandwidth interval. Usually, Δω / ω L0 <<1. For topological charge number, take l Ln = l1+ l L0 (n-1)ε2, then l L0 corresponds to the center topological charge number, the topological charge number of the first mode is l L1 , the topological charge number interval between different modes is l L0 ε2, and the total topological charge number dispersion is Δl = l L0 (N-1)ε2, where ε2is a constant determining the topological charge number dispersion interval. Usually, l L0 ε2is a constant. Here, take l L0 ε2=1.

[0045] Generally, light superposition of N modes with the same initial phase and equal interval topological charge number is called light spring. In the present invention, a new concept of super light spring is proposed, which is incoherent in all directions of angular momentum, time and space, and its frequency is randomly distributed within a certain range, the initial phase is randomly distributed, and the topological charge number is randomly distributed within a certain range, so that the laser plasma instability can be suppressed to a very low level.

[0046] From equation (5), the amplitude of the light spring superposition of N modes is:

[0047]

[0048] This means that if the incident laser with only one mode and pulse length T0 is replaced by a springer with N modes, the pulse length of each mode is shortened to T0 / N and the angular momentum dispersion is reduced to 2π / N.

[0049] For a non-relativistic laser, the SRS is generally described by the following equation:

[0050]

[0051]

[0052] where ω pe is the frequency of the electron plasma wave, a L is the vector potential of the incident laser, a and a are the vector potential of the backscattered laser and the plasma density perturbation, Here, the radial gradient is ignored, and the scattering wave is considered to be Thus, for a low-frequency scattering wave, we have:

[0053]

[0054] Here ωl is the frequency of the electron Langmuir wave. It can be seen that the dispersion relation depends on the radial position. For vortex light or springer light, we estimate the radius R of the peak amplitude here. Assuming that only one mode (ω L0 , k L0 , l L0 ) is resonant, then:

[0055]

[0056] Write ω as ω = ω l + δω = ω l + iγ s , where δ ω << ω l . When ε2 = 0 is considered, the expression for the instability growth rate γ s can be obtained from equation (9):

[0057]

[0058] When ε1 = 0 is considered, the expression for the instability growth rate γ s can be obtained from equation (9):

[0059] where ω s = ωL0 -ω l is the frequency of the scattered wave SRS. Here, to calculate the growth rate, we assume Δω / ω L0 <<1, Δl / l L0 <<1.

[0060]

[0061] For the incident laser superposed by N modes, the peak laser amplitude is From (11-1) and (11-2), we see that there are two incoherent terms to reduce γ s , where the term in (11-1) is the frequency bandwidth Δω, and the term in (11-2) is the topological charge number discreteness Δl. It is particularly noted that when Δl>(1 / l L0 )(ω s0 / ω L0 )(2πR / λ L0 ) 2 (Δω / ω L0 ), the Δl term dominates. Since Δω / ω L0 <<1, it is easy to realize the Δl term dominates.

[0062] To verify the above analysis, here we carry out three-dimensional particle-in-cell simulation with the EPOCH code. As an example, to reduce the simulation time, we take l1=3, N=7, so that the average topological charge number is In real experiments, one can take larger To simplify the problem, we take the same mode amplitude distribution in the cross section:

[0063]

[0064] To reduce the simulation time, we take a 00 =0.6, w0=10 μm. The incident laser central wavelength λ L0 =800 nm (corresponding to the central frequency ω L0 =3.75×10 14 HZ). Thus, the spring laser power is P=0.16 TW. We take the frequency interval ω L0 e1=0.03ω L0 , so the total frequency width is (N-1)ω L0 e1=0.18ω L0 . Thus, the spring laser pitch Δx=2πc / (ω L0 e1)≈27 μm. We take the laser amplitude to be constant in time, and the pulse width to be 93.3 fs. We take the electron density n e =1.7×10 20 Cm -3(i.e. about 0.15 times the critical density). The size of the simulation module moving with time is: 60 μm (x) x 80 μm (y) x 80 μm (z), corresponding to 600 x 800 x 800 simulation cells, with one particle in each simulation cell. The spatial region where the plasma is located is: 15 μm < x < 800 μm, -75 μm < y < 75 μm, -75 μm < Z < 75 μm.

[0065] The case of the spring light propagating 240 μm is investigated below. Figure 1A The distribution of the spring light in two-dimensional k-space is shown schematically. Figure 1B The distribution of the Laguerre-Gaussian light in two-dimensional k-space is shown schematically. Figure 1A and 1B The X component of the wave number is the abscissa. From the two-dimensional wave number k-space distribution given in Figure 1A and Figure 1B It can be seen from the two-dimensional wave number k-space distribution given in that the spring light composed of 7 frequencies is clearly visible, and the weak signal in the left box is from the SRS scattered light. As a comparison, we also calculated the case of the wide-band Laguerre-Gaussian light with the same topological charge

[0066] In order to clearly see the topological dispersion of the spring light (l L0 ε2≠0) and the spectral width of the Laguerre-Gaussian light (l L0 ε2=0) affecting the SRS growth process, the evolution behavior of the SRS scattering share with space in different cases is further given in Figure 2 Figure 2 is the SRS scattering share (the ratio of the scattered energy to the incident laser energy) of the spring light (l L0 ε2≠0) and the Laguerre-Gaussian light (l L0 ε2=0) with space. Figure 2 The abscissa in s is the laser propagation distance X, and the ordinate is the ratio of the scattered light amplitude E L to the laser amplitude E L0 In the case of ε1=0.03, the SRS scattering share of the spring light with l L0 ε2=1 is only 50% of that of the Laguerre-Gaussian light with l L0 ε2=0; in the case of ε1=0 (i.e. single frequency), the former is only 43% of the latter. It can be seen that the Δl dispersion plays a major role. In addition, it can also be seen from Figure 2 that for the Laguerre-Gaussian light (l L0ε 2 = 0 ), the SRS fraction can be reduced to 57% of that of ε 1 = 0 with a wideband of ε 1 = 0.03. That is, the wideband helps to reduce the SRS fraction. Further, the random phase also helps to reduce the SRS fraction. From Figure 2 It can be seen that the super-spring light with random frequency and random phase can significantly reduce the SRS fraction by about 6 times.

[0067] In order to verify whether the superposition of laser beams will cause laser intensity spots in space and time, and thus generate superhot electrons, thereby preheating the target and leading to ignition failure. For the two cases of FIG. 1, the electron energy spectrum distribution in the plasma after the laser passes through and the plasma wave does not significantly attenuate is given in Figure 3 Figure 3 For the incident laser to reach x = 240 μm, the electron energy spectrum distribution in the plasma driven by the Laguerre-Gaussian light of l = 6 and ε 1 = 0.03 (black line) and the spring light of l = 3-9 and ε 1 = 0.03 (gray line) is shown. Compared with the case of the Laguerre-Gaussian light, it can be seen that the spring light does not produce additional superhot electrons. This shows that the angular momentum energy divergence does not cause the generation of superhot electrons. This is because after the angular momentum decoherence, the electron plasma wave is weakened, and thus the superhot electrons caused by Landau damping are also reduced, and this superhot electron reduction effect exceeds the increase of superhot electrons due to local laser enhancement.

[0068] On a thermonuclear fusion device, a laser beam is usually formed by the superposition of multiple sub-beam groups. Different topological charges can be taken for these sub-beam groups, so as to combine multiple Laguerre-Gaussian beam groups into a spring light beam group. Further, considering the existence of angular momentum dispersion, the super-spring light with random phase and random angular momentum can more effectively suppress SRS, as shown in Figure 2 .

[0069] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme in the embodiments of the present application will be described in detail below.

[0070] Figure 4 An exemplary flowchart of the incident laser processing method for thermonuclear fusion in the embodiments of the present application is shown in FIG. 4. As shown in Figure 4 , the method can include the following steps:

[0071] Step 401, receiving the initial incident laser from the laser device.

[0072] ​The initial incident laser from the laser device typically comprises multiple sub-laser beams. In practical applications, these multiple sub-laser beams can be: multiple sub-laser beams with the same frequency and the same relative phase; or multiple sub-laser beams with equally distributed frequencies and the same relative phase; or multiple sub-laser beams with equally distributed frequencies and randomly distributed relative phases.

[0073] Step 402: Perform angular momentum decoherence processing on the initial incident laser to obtain the target incident laser for injection into the thermonuclear fusion black cavity. The thermonuclear fusion black cavity can be a six-hole spherical cavity, a cylindrical cavity, etc.

[0074] In this step, it can be as follows: Figure 5 As shown, for each sub-laser beam in the initial incident laser, such as a regular Gaussian laser beam, a phase plate 51 is used to convert it into a sub-laser beam with a different topological charge than the other sub-laser beams, such as a vortex beam. Figure 5 The diagram shows the case with six phase plates. Then, the sub-laser beams with different topological charges can be combined into a spring beam, which can then be used as the target incident laser for injection into the thermonuclear fusion black cavity. At this point, the spring beam is the incident laser with angular momentum coherence removed.

[0075] In a specific implementation, the sub-laser beams with different topological charge numbers can be sub-laser beams with a topological charge number that is arithmetically distributed.

[0076] Accordingly, if the initial incident laser comprises sub-laser beams with the same frequency and relative phase, then the target incident laser obtained in this step can be as follows: Figure 5 The narrow-band, long-pitch spring light with a strong spot whose position does not change with time is shown on the right side (a). At this time, the spring light has only lost its angular momentum coherence.

[0077] If the initial incident laser consists of sub-laser beams with equally distributed frequencies and the same relative phase, then the target incident laser obtained in this step can be as follows: Figure 5 The wideband, short-pitch spring light with a strong spot whose position changes over time, shown on the right side (b), has not only lost angular momentum coherence but also temporal coherence.

[0078] If the initial incident laser comprises sub-laser beams with a uniform frequency distribution and a random relative phase distribution, then the target incident laser obtained in this step can be as follows: Figure 5 The superspring light shown on the right (c) contains several strong spots whose positions change over time. At this time, the spring light not only loses angular momentum coherence, but also temporal and spatial coherence.

[0079] In practice, the phase plate structure can be implemented in various ways.Figure 6 A schematic diagram of a phase plate in one example is shown. Figure 6 As shown, assuming these phase plates are circular, the line connecting the center O of the circle to a point A on the circumference is defined as the z-axis, and the angle formed between the line connecting the center O of the circle to any point B on the circumference and the z-axis is defined as... The thickness at point OB of the circular plate can then be designed as an angle. The function. Let the OB line wrap around the phase plate once, i.e. The thickness changes by ΔL from 0 to 2π, and the refractive index of the phase plate is n. Therefore, the relative change in the optical path length of the laser after passing through the phase plate is (n-1)ΔL, corresponding to a phase change of 2π(n-1)ΔL / λ. L The topological charge of the vortex beam is then (n-1)ΔL / λ. L Here λ L This refers to the wavelength of the sub-laser beam. Similarly, light fan technology can be used to convert Gaussian laser light into vortex light. Accordingly, with... Figure 5 Taking the spring beam as an example, θ is the angle between the sub-beam transmission direction and the bundle transmission direction, generally θ < 0.5°. The spring beam pitch Δx = 2πc / (ω L0 ε1), where ω L0 ε1=Δω / Δl. Here, ω L0 The laser center frequency is given by ε1, which is a constant determining the frequency bandwidth gap, and Δω = (N-1)ω. L0ε1 Δl represents the total frequency bandwidth, and Δl represents the dispersion of the total topological charge.

[0080] In practice, the structures of multiple phase plates can be different from each other, or they can have similar structures but different ΔL, etc.

[0081] Furthermore, the present invention provides a laser device. Figure 7 This is an exemplary structural diagram of a laser device according to an embodiment of the present invention. Figure 7 As shown, the laser device may include: a laser device body 71 and an angular momentum decoherence component 72.

[0082] The main body 71 of the laser device is used to provide the initial incident laser that needs to be injected into the thermonuclear fusion black cavity.

[0083] The angular momentum decoherence component 72 is used to perform angular momentum decoherence processing on the initial incident laser to obtain the target incident laser for injection into the thermonuclear fusion black cavity.

[0084] In a specific implementation, the angular momentum decoherence component 72 may include: a phase plate support ( Figure 7 (not shown in the image) and multiple phase plates (not shown in the image) disposed on the phase plate support. Figure 7The phase plate corresponding to one of the sub laser beams of the initial incident laser is used to convert the corresponding sub laser beam into a sub laser beam with a different topological charge from other sub laser beams, so that each sub laser beam with a different topological charge is synthesized into a spring light, and the spring light is the target incident laser used for injection into the hot-nuclear fusion black hole. In a specific implementation, the sub laser beams with different topological charges can be sub laser beams with an arithmetic progression of topological charges.

[0085] In one embodiment, when the initial incident laser includes sub laser beams with the same frequency and the same relative phase, the target incident laser is a spring light with a narrow frequency band, a long pitch, and one strong spot with a position not changing over time. When the initial incident laser includes sub laser beams with an arithmetic progression of frequencies and the same relative phase, the target incident laser is a spring light with a wide frequency band, a short pitch, and one strong spot with a position changing over time. When the initial incident laser includes sub laser beams with an arithmetic progression of frequencies and a random distribution of relative phases, the target incident laser is a super spring light including several strong spots with positions changing over time.

[0086] In addition, the application further provides an incident laser processing system for hot-nuclear fusion, Figure 8 FIG. 1 shows an exemplary structure of an incident laser processing system for hot-nuclear fusion according to an embodiment of the application. As shown in the figure, the system can include a laser device 81 and an angular momentum decoherence device 82. Figure 8

[0087] The laser device 81 is used to provide an initial incident laser to be injected into a hot-nuclear fusion black hole.

[0088] The angular momentum decoherence device 82 is used to perform angular momentum decoherence processing on the initial incident laser to obtain a target incident laser to be injected into the hot-nuclear fusion black hole.

[0089] In a specific implementation, the angular momentum decoherence device 82 can include a phase plate support (not shown in the figure) and a plurality of phase plates (not shown in the figure) arranged on the phase plate support. One phase plate corresponds to one of the sub laser beams of the initial incident laser, and is used to convert the corresponding sub laser beam into a sub laser beam with a different topological charge from other sub laser beams, so that each sub laser beam with a different topological charge is synthesized into a spring light, and the spring light is the target incident laser used for injection into the hot-nuclear fusion black hole. In a specific implementation, the sub laser beams with different topological charges can be sub laser beams with an arithmetic progression of topological charges. Figure 8 Figure 8 The phase plate corresponding to one of the sub laser beams of the initial incident laser is used to convert the corresponding sub laser beam into a sub laser beam with a different topological charge from other sub laser beams, so that each sub laser beam with a different topological charge is synthesized into a spring light, and the spring light is the target incident laser used for injection into the hot-nuclear fusion black hole. In a specific implementation, the sub laser beams with different topological charges can be sub laser beams with an arithmetic progression of topological charges.

[0090] ​​In one embodiment, when the initial incident laser comprises sub-beams with same frequency and same relative phase, the target incident laser is a spring light with narrow frequency band, long pitch, and one strong spot with position not changing with time. When the initial incident laser comprises sub-beams with equal difference frequency and same relative phase, the target incident laser is a spring light with wide frequency band, short pitch, and one strong spot with position changing with time. When the initial incident laser comprises sub-beams with equal difference frequency and random relative phase, the target incident laser is a super spring light with several strong spots with position changing with time.

[0091] The above merely illustrates several embodiments of the present application, which are not intended to limit the present application. In practical applications, other specific embodiments can be transformed according to the description of the embodiments of the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for the treatment of incident laser light for thermonuclear fusion, characterized in that, The method comprises the following steps: receiving initial incident laser from a laser device; the initial incident laser comprises a plurality of sub-laser beams, and the relative phases of the plurality of sub-laser beams are the same or randomly distributed; performing angular momentum decoherence processing on the initial incident laser to obtain sub-laser beams satisfying a set topological charge dispersion, and the sub-laser beams satisfying the set topological charge dispersion are combined into a target incident laser for injection into a hot-nuclear fusion black hole.

2. The method of claim 1, wherein, The angular momentum decoherence processing on the initial incident laser comprises: for each sub-laser beam in the initial incident laser, a phase plate is used to convert it into a sub-laser beam with a different topological charge from other sub-laser beams; the sub-laser beams with different topological charges are combined into a spring light, and the spring light is used as the target incident laser for injection into the hot-nuclear fusion black hole.

3. The method of claim 2, wherein, The sub-laser beams with different topological charges are sub-laser beams with an arithmetic progression of topological charges.

4. The method of claim 3, wherein, The initial incident laser comprises sub-laser beams with the same frequency and the same relative phase; The target incident laser is a spring light with a narrow frequency band, a long pitch, and one strong spot with a fixed position over time.

5. The method of claim 3, wherein, The initial incident laser comprises sub-laser beams with an arithmetic progression of frequencies, the same relative phase, and time decoherence; The target incident laser is a spring light with a wide frequency band, a short pitch, and one strong spot with a time-varying position.

6. The method of claim 3, wherein, The initial incident laser comprises sub-laser beams with an arithmetic progression of frequencies, random relative phases, and time and space decoherence; The target incident laser is a super spring light with a plurality of strong spots with time-varying positions.

7. The method of claim 2, wherein, The initial incident laser comprises sub-laser beams with random frequencies, random relative phases, and time and space decoherence; The target incident laser is a super spring light with a plurality of strong spots with time-varying positions.

8. Laser device, characterized in that The method comprises the following steps: a laser device body is used to provide initial incident laser to be injected into a hot-nuclear fusion black hole, the initial incident laser comprises a plurality of sub-laser beams, and the relative phases of the plurality of sub-laser beams are the same or randomly distributed; and an angular momentum decoherence component is used to perform angular momentum decoherence processing on the initial incident laser to obtain sub-laser beams satisfying a set topological charge dispersion, and the sub-laser beams satisfying the set topological charge dispersion are combined into a target incident laser for injection into a hot-nuclear fusion black hole.

9. The laser device of claim 8, wherein, The angular momentum decoherence component comprises: a phase plate support; and a plurality of phase plates arranged on the phase plate support, one phase plate corresponding to one sub-laser beam in the initial incident laser, and used to convert the corresponding sub-laser beam into a sub-laser beam with a different topological charge from other sub-laser beams, so that the sub-laser beams with different topological charges are combined into a spring light, and the spring light is the target incident laser for injection into the hot-nuclear fusion black hole.

10. An incident laser processing system for thermonuclear fusion, characterized by, The method comprises the following steps: a laser device is used to provide initial incident laser to be injected into a hot-nuclear fusion black hole, the initial incident laser comprises a plurality of sub-laser beams, and the relative phases of the plurality of sub-laser beams are the same or randomly distributed; and The angular momentum decoherence device is used for angular momentum decoherence processing of the initial incident laser to obtain each sub-laser beam satisfying a set topological charge dispersion, and the each sub-laser beam satisfying the set topological charge dispersion is synthesized into a target incident laser for injection into a hot-nuclear fusion black cavity.

11. The system of claim 10, wherein, The angular momentum decoherence device comprises: a phase plate support; and a plurality of phase plates arranged on the phase plate support, one phase plate corresponding to one sub-laser beam in the initial incident laser, and used for converting the corresponding sub-laser beam into a sub-laser beam with a different topological charge from other sub-laser beams, so that each sub-laser beam with a different topological charge is synthesized into a spring light, and the spring light is the target incident laser for injection into the hot-nuclear fusion black cavity.

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