Multi-beam vortex light synthesis system based on inter-beam energy transfer
By using a multi-beam vortex light synthesis system that transfers energy between beams in the vacuum target chamber, the problem of limited improvement of vortex light intensity is solved, and the formation and structural stability of high-intensity vortex light are achieved.
Patent Information
- Application Number
- CN202521215058.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-13
- Publication Date
- 2025-07-25
- Estimated Expiration
- 2035-06-13
AI Technical Summary
In the prior art, the increase in the intensity of the vortex light is limited, and the material of the optical device is easily damaged under high-intensity laser, making it difficult to effectively increase the intensity of the vortex light.
A multi-beam vortex light synthesis system based on inter-beam energy transfer is adopted. By interacting with multiple vortex light in the modulated gas target in the vacuum target chamber, energy transfer between light beams is realized and high-intensity vortex light is formed.
The peak light intensity of the vortex light is increased, the structural stability of the vortex beam is maintained, and the intensity of the vortex light is increased.
Smart Images
Figure CN223155321U_ABST
Abstract
Description
Technical Field
[0001] The utility model mainly relates to the technical field of multi-beam synthesis, in particular to a multi-beam vortex light synthesis system based on inter-beam energy transfer. Background Technique
[0002] Since lasers were put into application, how to obtain high-quality and high-energy-density lasers has always been the research focus. Under this demand, multi-beam synthesis technology, as an effective technical means to break through the single-beam power output limit, has received extensive attention and developed vigorously. Existing multi-beam synthesis often adopts methods such as power synthesis, spectral synthesis, and coherent synthesis.
[0003] During the research process of inertial confinement fusion, researchers discovered the energy transfer phenomenon between two intersecting lasers with different frequencies and realized that beam-to-beam energy transfer can be used to regulate and synthesize lasers. Currently, cross-beam coherent power synthesis experiments based on the beam-to-beam energy transfer effect can generate a collimated beam using energy transfer in low-density hot plasmas, and its energy is more than three times that of the incident beam.
[0004] In recent years, extensive research and applications have been carried out on vortex light with a unique phase structure and light field distribution at home and abroad. For how to generate vortex light, there are mainly two types of methods experimentally, directly generating and indirectly generating vortex light. Directly generating vortex light mainly generates vortex beams through the resonance of the resonant cavity; indirectly generating vortex light mainly modulates Gaussian light into vortex light of a specific mode by using optical elements such as spiral phase plates and spatial light modulators. However, these methods are usually limited by the material of optical devices and are easily damaged under high-intensity lasers, seriously restricting the improvement of the intensity of vortex light. Therefore, how to effectively improve the intensity of vortex light is a key scientific problem to be solved urgently. Content of the Utility Model
[0005] Aiming at the technical problems existing in the prior art, the utility model proposes a multi-beam vortex light synthesis system based on inter-beam energy transfer.
[0006] To achieve the above purpose, the technical solution adopted by the utility model is as follows:
[0007] A multi-beam vortex light synthesis system based on inter-beam energy transfer includes a multi-beam vortex light generation device and a vacuum target chamber, and a modulated gas target is arranged in the vacuum target chamber; the multi-beam vortex light generation device includes a laser source and a beam conversion device; the beam conversion device includes a plurality of spiral phase plates, the laser source generates multiple beams of circularly polarized femtosecond Gaussian lasers, the number of spiral phase plates is the same as the number of femtosecond Gaussian lasers, the spiral phase plates correspond to the femtosecond Gaussian lasers one by one, and each beam of femtosecond Gaussian laser is incident on the corresponding spiral phase plate and is respectively converted into circularly polarized vortex light;
[0008] Multiple vortex light beams generated by a multiple vortex light generating device are incident on a modulation gas target. In the modulation gas target, the multiple vortex light beams interact with each other to form high-intensity vortex light, which is emitted from the output window of the vacuum target chamber.
[0009] Furthermore, the multiple vortex light generating device further includes a light beam transmission module and a light beam focusing module disposed between the laser source and the light beam conversion device. The laser source is disposed outside the vacuum target chamber, and the light beam transmission module, the light beam focusing module, and the light beam conversion device are disposed inside the vacuum target chamber.
[0010] Furthermore, multiple femtosecond Gaussian laser beams with circular polarization generated by the laser source are respectively incident on the light beam transmission module through the input window of the vacuum target chamber, transmitted to the light beam focusing module through the light beam transmission module, and transmitted and focused by the light beam focusing module and then injected into the corresponding spiral phase plate.
[0011] Furthermore, the laser intensity of the femtosecond Gaussian laser is 10 18 ~10 22 W / cm 2 .
[0012] Furthermore, the multiple vortex light beams incident on the modulation gas target are symmetrically distributed left and right, and the laser intensities of two vortex light beams that are symmetrically distributed left and right are the same.
[0013] Furthermore, there is a gap between the spiral phase plates so that the vortex light beams converted by each spiral phase plate do not overlap with each other.
[0014] Furthermore, the vortex light beam converted by the spiral phase plate is Laguerre-Gaussian light.
[0015] Furthermore, the modulation gas target uses a hydrogen target.
[0016] Furthermore, the plasma density distribution of the modulation gas target is uniform.
[0017] Furthermore, it further includes a plasma replenishing mechanism for replenishing plasma to the modulation gas target.
[0018] Compared with the prior art, the beneficial technical effects of the present utility model are as follows:
[0019] The present utility model provides a multiple vortex light synthesis system based on inter-beam energy transfer. In the vacuum target chamber, multiple vortex light beams are incident on the modulation gas target. In the modulation gas target, the multiple vortex light beams interact with each other to achieve energy transfer between the light beams to form high-intensity vortex light, and are emitted from the output window of the vacuum target chamber. In this way, the peak light intensity of the vortex light can be increased, and the structure of the vortex light beam can be maintained stable. Description of the Drawings
[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.
[0021] Figure 1 It is a schematic structural diagram of a multi-beam vortex light synthesis system based on inter-beam energy transfer in an embodiment;
[0022] Figure 2 It is an energy distribution diagram finally obtained by a multi-beam vortex light synthesis system based on inter-beam energy transfer in an embodiment;
[0023] Figure 3 It is an optical intensity evolution diagram at different phase differences finally obtained by a multi-beam vortex light synthesis system based on inter-beam energy transfer in an embodiment.
[0024] Reference numerals:
[0025] 1. Laser source, 2. Beam transmission module, 3. Beam focusing module, 4. Beam conversion device, 5. Plasma replenishment mechanism, 6. Modulation gas target, 7. Vacuum target chamber. Specific embodiments
[0026] In order to make the purpose, technical solutions and advantages of the present application clearer, the following further details the present application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application and are not used to limit the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope protected by the present application.
[0027] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.
[0028] In addition, the descriptions such as "first" and "second" in the present application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "multiple groups" is at least two groups, such as two groups, three groups, etc., unless otherwise specifically defined.
[0029] In this application, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, a physical connection or a wireless communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0030] In addition, the technical solutions between various embodiments of this application can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.
[0031] In one embodiment, a multi-beam vortex light synthesis system based on inter-beam energy transfer is provided, including a multi-beam vortex light generating device and a vacuum target chamber 7, and a modulation gas target 6 is arranged in the vacuum target chamber 7;
[0032] The multi-beam vortex light generated by the multi-beam vortex light generating device is incident on the modulation gas target 6, and the multi-beam vortex lights interact with each other in the modulation gas target 6 to realize inter-beam energy transfer to form high-intensity vortex light, and the high-intensity vortex light is emitted from the output window of the vacuum target chamber 7. The vacuum target chamber 7 can prevent the laser parameters from being affected due to the propagation of the laser in the air, thereby affecting the energy transfer efficiency. It should be noted that the laser beam emitted from the output window of the vacuum target chamber 7 is a laser beam.
[0033] Refer to Figure 1 , a structural schematic diagram of a multi-beam vortex light synthesis system based on inter-beam energy transfer in one embodiment, including a laser source 1, a beam transmission module 2, a beam focusing module 3, a beam conversion device 4, a modulation gas target 6, and a vacuum target chamber 7. The vacuum target chamber 7 has an input window and an output window. There are multiple laser sources 1 for generating multiple beams of circularly polarized femtosecond Gaussian lasers. There is a distance between the laser sources 1 and there is a certain small angle between the output beams to ensure that the laser beams output by each laser source 1 do not overlap. Further, a plasma replenishing mechanism 5 for replenishing plasma to the modulation gas target is further included.
[0034] The multi-beam vortex light generating device includes a laser source 1, a beam transmission module 2, a beam focusing module 3, and a beam conversion device 4. The laser source 1 is arranged outside the vacuum target chamber 7, and the beam transmission module 2, the beam focusing module 3, and the beam conversion device 4 are arranged inside the vacuum target chamber 7. The beam transmission module 2 is arranged on the output optical path of the laser source 1. After changing the directions of the multi-beam femtosecond Gaussian lasers generated by the laser source 1, each femtosecond Gaussian laser is injected into the beam focusing module 3.
[0035] The laser source 1 generates multi-beam circularly polarized femtosecond Gaussian lasers. Preferably, the laser intensity of the femtosecond Gaussian lasers is 10 18 ~10 22 W / cm 2 . The multi-beam circularly polarized femtosecond Gaussian lasers are respectively incident on the beam transmission module 2 through the input window of the vacuum target chamber 7, transmitted to the beam focusing module 3 through the beam transmission module 2, and the multi-beam circularly polarized femtosecond Gaussian lasers are transmitted and focused by the beam focusing module 3 and then injected into the beam conversion device 4. The beam conversion device 4 converts each beam of circularly polarized femtosecond Gaussian laser into circularly polarized vortex light respectively.
[0036] The beam conversion device 4 includes a plurality of spiral phase plates. The number of spiral phase plates is the same as the number of femtosecond Gaussian lasers. The spiral phase plates correspond to the femtosecond Gaussian lasers one by one. Each beam of femtosecond Gaussian laser is incident on the corresponding spiral phase plate and is respectively converted into circularly polarized vortex light. There is a gap between the spiral phase plates so that the vortex lights converted by the spiral phase plates do not overlap with each other.
[0037] Preferably, the topological charge number of the vortex light converted by the spiral phase plate is 1 or -1. More preferably, the topological charge numbers of the vortex lights converted by the spiral phase plates in the beam conversion device 4 are the same. The gap between the spiral phase plates needs to ensure that the converted vortex beams do not overlap with each other. Preferably, the vortex light converted by the spiral phase plate is Laguerre-Gaussian light.
[0038] The multi-beam vortex lights output by the beam conversion device 4 are incident on the modulation gas target 6. In the modulation gas target 6, the multi-beam vortex lights interact with each other to realize energy transfer between the beams to form high-intensity vortex light, and are emitted from the vacuum target chamber 7 through the output window of the vacuum target chamber 7. Preferably, the multi-beam vortex lights incident on the modulation gas target 6 are symmetrically distributed left and right, and the laser intensities of the two beams of vortex light that are symmetrically distributed left and right are the same to ensure the symmetry of the energy transfer between the beams in the modulation gas target 6 subsequently.
[0039] Preferably, a plasma with a plasma density of 10% of the critical plasma density is provided in the modulation gas target 6. Preferably, the modulation gas target 6 is a hydrogen target. More preferably, the plasma density distribution in the modulation gas target 6 is uniform. The specific size of the modulation gas target 6 is not limited in this embodiment, as long as the laser can hit the modulation gas target 6 entirely.
[0040] The working process of the present utility model is as follows: Multiple laser sources 1 generate multiple beams of circularly polarized femtosecond Gaussian lasers. Each beam of femtosecond Gaussian laser enters the vacuum target chamber 7 through the input window of the vacuum target chamber 7, is redirected by the beam transmission module 2, and transmitted to the beam focusing module 3. In the beam focusing module 3, the laser focal spot shrinks and the energy density is further increased. The focused laser enters the beam conversion device 4 and is modulated into a vortex light with a specific topological charge and a fixed phase difference. The modulated vortex light enters the modulation gas target 6, and the energy transfer between the beams and between the beam and the plasma occurs in the modulation gas target 6. Specifically, the energy of the vortex beam located on the outside will be transferred to the vortex beam located in the middle, so that the energy of the middle vortex beam is increased, forming a high-intensity vortex light and exiting the vacuum target chamber 7 through the output window of the vacuum target chamber 7.
[0041] In another embodiment, based on the multi-beam vortex light synthesis system based on inter-beam energy transfer as shown in Figure 1 A synthesis scheme of three beams of vortex light in low-density plasma is proposed, including a laser source 1, a beam transmission module 2, a beam focusing module 3, a beam conversion device 4, a modulation gas target 6, a plasma replenishment mechanism 5, and a vacuum target chamber 7. There are three laser sources 1, which generate three beams of circularly polarized femtosecond Gaussian lasers. The three beams of circularly polarized femtosecond Gaussian lasers enter the beam conversion device 4 through the beam transmission module 2 and the beam focusing module 3. Specifically, three beams of circularly polarized femtosecond Gaussian lasers incident at a small angle are modulated into three beams of vortex light with a locked phase difference by the beam conversion device 4, and they interact with each other in the low-density plasma. The three beams of vortex light are the left vortex light, the middle vortex light, and the right vortex light. The left vortex light and the right vortex light are symmetrically distributed on both sides of the action of the middle vortex light. In the modulation gas target 6, part of the energy of the two outer beams of vortex light (i.e., the left vortex light and the right vortex light) is transferred to the middle vortex light through inter-beam energy transfer, thereby increasing the laser intensity of the middle vortex light, forming a high-intensity vortex light and exiting the vacuum target chamber 7 through the output window of the vacuum target chamber 7. In this scheme, changing the phase difference, laser spacing, and beam waist radius between the three beams of vortex light will affect the efficiency of energy transfer.
[0042] It should be noted that each component of the laser source 1, the beam transmission module 2, the beam focusing module 3, the beam conversion device 4, the plasma replenishment mechanism 5, the modulation gas target 6, and the vacuum target chamber 7 itself can adopt existing related products, and the connection methods between the components are all prior arts.
[0043] The laser source 1 generates three beams of circularly polarized Gaussian lasers with a laser intensity of 10 18 ~ 10 22 W / cm 2 , the laser wavelength is λ = 0.8 μm, the focal spot radius is 4 μm, and the temporal profile is Gaussian , the pulse length . The normalized laser intensity is 2a0.
[0044] The pre-plasma in the modulation gas target 6 is composed of protons (H+) and electrons (e-), and the density of the plasma is 0.1n c , n c is the critical plasma density.
[0045] The laser source generates three beams of circularly polarized Gaussian lasers with an intensity of 8.625×10 18 W / cm 2 , and the included angle between adjacent beams is 6°. Through the beam transmission module 2 and the beam focusing module 3 in the vacuum target chamber 7, the Gaussian laser is focused and then injected into the spiral phase plate in the beam conversion device 4 to convert the Gaussian light into Laguerre-Gaussian beams (LG beams). The topological charge number of the Laguerre-Gaussian beams converted by the beam conversion device 4 is 1, and the phase difference between the two outer vortex beams leads the middle vortex beam by π / 2. It should be noted that due to the doughnut structure of the vortex light field, a single vortex beam will appear as two beams of light, one above and one below. It can be predicted that when two vortex beams interact, the two adjacent beams will play a major role. Therefore, the phase difference between the two Laguerre-Gaussian beams described below refers to the phase difference between the two adjacent beams in the four beams of light exhibited by the two Laguerre-Gaussian beams.
[0046] After the three Laguerre-Gaussian beams enter the modulation gas target 6, their interaction causes energy transfer between the beams, and the energy of the Laguerre-Gaussian beams with lagging phases on both sides is transferred to the middle Laguerre-Gaussian beam, significantly increasing the energy of the middle beam.
[0047] The working principle of the present utility model is as follows: When two high-intensity laser beams are transmitted in a plasma, if their intervals are appropriate and have a fixed phase difference, the laser energy will be transferred from the laser with a leading phase to the laser with a lagging phase. At the same time, the ponderomotive force of the high-intensity laser will push the electrons of the plasma away from the region with a higher electromagnetic field. Since the ponderomotive force has nothing to do with the positive or negative charge of charged particles, the ions will also be pushed away from the high electromagnetic field intensity region. However, since the mass of ions is much larger than that of electrons, the ponderomotive force on ions can be ignored relative to electrons. After the ponderomotive force pushes the electrons away from the region where the laser is located, the electron density around the laser decreases, causing the refractive index of the plasma in this region to increase. Since the laser energy is transferred to the beam with a lagging phase, the intensity of this laser increases, the ponderomotive force increases, and thus electrons can be better repelled to form a stable plasma channel. The low refractive index brought about by the high electron density at the edge of the plasma channel has a tendency to deflect the laser inward, making it difficult for the laser that obtains energy to diverge, thereby maintaining the stable propagation of the laser. In a system where three vortex lights interact with each other, the plasma channel formed by the outer vortex lights will further increase the plasma density around the middle beam, thus better maintaining the energy of the middle beam and suppressing its divergence. At the same time, the two outer vortex lights can symmetrically transfer energy to the middle beam, thus maintaining the spatial symmetry of the energy distribution of the middle beam, and ensuring that the beam structure of the middle vortex light is not easily destroyed by modulation instability during the transmission process.
[0048] As Figure 2 shown, the laser intensity of the middle Laguerre-Gaussian beam is significantly enhanced after energy transfer. I0 is the light intensity corresponding to the normalized electric field intensity. Compared with the outer Laguerre-Gaussian beam, its intensity has increased by more than three times.
[0049] As Figure 3 shown, the three lines correspond to the light intensity evolution of the outer Laguerre-Gaussian beam and the middle Laguerre-Gaussian beam with different phase differences. After entering the plasma, the energy transfer effect causes the laser intensity to increase rapidly.
[0050] Matters not described in the present utility model are well-known technologies. To make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.
[0051] The above-described embodiments merely represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several deformations and improvements can still be made, and these all belong to the protection scope of the present application.
[0052] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.
Claims
1. A multi-beam vortex light synthesis system based on inter-beam energy transfer, characterized in that It includes a multi-beam vortex light generating device and a vacuum target chamber, in which a modulated gas target is arranged; the multi-beam vortex light generating device includes a laser source and a beam conversion device; the beam conversion device includes a plurality of spiral phase plates, the laser source generates multi-beam circularly polarized femtosecond Gaussian lasers, the number of spiral phase plates is the same as the number of femtosecond Gaussian lasers, the spiral phase plates correspond to the femtosecond Gaussian lasers one by one, and each beam of femtosecond Gaussian laser is incident on the corresponding spiral phase plate and is respectively converted into circularly polarized vortex light; The multi-beam vortex light generated by the multi-beam vortex light generating device is incident on the modulated gas target, and the multi-beam vortex lights interact with each other in the modulated gas target to form high-intensity vortex light, which is emitted from the output window of the vacuum target chamber.
2. The multi-beam vortex light synthesis system based on inter-beam energy transfer according to claim 1, wherein The multi-beam vortex light generating device further includes a beam transmission module and a beam focusing module arranged between the laser source and the beam conversion device, wherein the laser source is arranged outside the vacuum target chamber, and the beam transmission module, the beam focusing module and the beam conversion device are arranged inside the vacuum target chamber.
3. The multi-beam vortex light synthesis system based on inter-beam energy transfer according to claim 2, wherein The multi-beam circularly polarized femtosecond Gaussian lasers generated by the laser source are respectively incident on the beam transmission module through the input window of the vacuum target chamber, transmitted to the beam focusing module through the beam transmission module, and the multi-beam circularly polarized femtosecond Gaussian lasers are transmitted and focused by the beam focusing module and then injected into the corresponding spiral phase plate.
4. The multi-beam vortex light synthesis system based on inter-beam energy transfer according to claim 3, wherein The laser intensity of the femtosecond Gaussian laser is 10 18 ~10 22 W / cm 2 .
5. The multi-beam vortex light synthesis system based on inter-beam energy transfer according to claim 4, wherein The multi-beam vortex lights incident on the modulated gas target are symmetrically distributed left and right, and the laser intensities of two vortex lights that are symmetrically distributed left and right are the same.
6. The multi-beam vortex light synthesis system based on inter-beam energy transfer according to any one of claims 2 to 5, characterized in that There is a gap between the spiral phase plates so that the vortex lights converted by each spiral phase plate will not overlap.
7. The multi-beam vortex light synthesis system based on inter-beam energy transfer according to claim 6, wherein The vortex light converted by the spiral phase plate is Laguerre-Gaussian light.
8. The multi-beam vortex light synthesis system based on inter-beam energy transfer according to claim 1 or 2 or 3 or 4 or 5 or 7, characterized in that The modulated gas target uses a hydrogen target.
9. The multi-beam vortex light synthesis system based on inter-beam energy transfer according to claim 8, wherein, The plasma density distribution of the modulated gas target is uniform.
10. The multi-beam vortex light synthesis system based on inter-beam energy transfer according to claim 9, wherein It further includes a plasma replenishing mechanism for replenishing plasma to the modulated gas target.