System and method for generating space compression light array by using Laguerre Gaussian beam

Abstract

The invention belongs to the technical field of quantum optics, and particularly relates to a system and method for generating a space compression light array by using Laguerre Gaussian beams, and the system comprises a laser, a first half-wave plate, a first polarization splitting prism, a first beam collector, a second half-wave plate, a second polarization splitting prism, a small reflector, and a spatial light modulator. The system comprises two large reflectors, a third half-wave plate, two third polarization splitting prisms, a second beam collector, a rubidium atom chamber, two quarter-wave plates, two fourth polarization splitting prisms and two balance zero-beat detectors. The first light beam collector and the second light beam collector are arranged on one side of the first polarization beam splitting prism and one side of the third polarization beam splitting prism respectively, the small reflector is arranged on one side of the second polarization beam splitting prism, and the spatial light modulator is in wired connection with the display controller. And the crosstalk problem of the traditional scheme is avoided.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of quantum optics, and particularly relates to a system and method for generating a spatially compressed light array by using a Laguerre-Gaussian light beam. BACKGROUND

[0002] In the field of quantum optics and quantum information processing, as an important non-classical resource, the squeezed light field can break the standard quantum limit and has a wide application prospect in quantum precision measurement, quantum communication and quantum computing. The traditional squeezed light generation is mainly based on the fundamental mode Gaussian light beam, and is realized by optical parametric oscillation or four-wave mixing nonlinear process. However, with the development of quantum technology, the single-mode squeezed light has been difficult to meet the needs of multi-dimensional quantum information coding and parallel quantum processing; the Laguerre-Gaussian (LG) light beam provides a new degree of freedom for spatial multiplexing quantum communication due to its unique spiral phase wavefront and orbital angular momentum characteristics. The combination of the squeezed characteristics and the spatial structure of the LG light beam forms a spatially squeezed light array, which can greatly improve the channel capacity and information processing dimension. At present, the generation of such structured light field faces many technical challenges: first, it is necessary to generate and control multiple LG light beams with high precision; second, it is necessary to maintain the spatial mode purity of each light beam in nonlinear interaction; third, it is also difficult to realize the synchronous measurement and characterization of multiple squeezed light.

[0003] In the prior art, the method for generating structured squeezed light usually adopts a single nonlinear crystal combined with a complex optical modulation system, but often has problems such as poor system stability, uneven squeezing degree, mode crosstalk, etc. Especially in the generation of squeezed light array, the existing scheme is difficult to ensure the array size, squeezing quality and system scalability at the same time. In addition, most of the systems can only generate fixed mode squeezed light, and lack the ability to flexibly control different orbital angular momentum modes.

[0004] Therefore, it is urgent to develop a new system and method which can efficiently and flexibly generate high-quality spatially squeezed light array and realize accurate measurement of its squeezing characteristics, and provide reliable light field resources for multi-dimensional quantum information processing. SUMMARY

[0005] The present application provides a system and method for generating a spatially squeezed light array by using a Laguerre-Gaussian light beam.

[0006] To achieve the above purpose, the present application adopts the following technical scheme: A system for generating spatially compressed light array with Laguerre-Gaussian beams, comprising a laser, a first half-wave plate, a first polarization beam splitter prism, a first beam collector, a second half-wave plate, a second polarization beam splitter prism, a small mirror, a spatial light modulator, two large mirrors, a third half-wave plate, two third polarization beam splitter prisms, a second beam collector, a rubidium atom cell, two quarter-wave plates, two fourth polarization beam splitter prisms, and two balanced homodyne detectors; The laser is used to emit a light beam, and the first half-wave plate, the first polarization beam splitter prism, the second half-wave plate, the second beam collector, the spatial light modulator, the pair of large mirrors, the third half-wave plate, the third polarization beam splitter prism, the rubidium atom cell, the two quarter-wave plates, the two fourth polarization beam splitter prisms, and the two balanced homodyne detectors are arranged in a transmission path of the light beam. The first half-wave plate, the first polarization beam splitter prism, the second half-wave plate, the second polarization beam splitter prism, and the third half-wave plate, the third polarization beam splitter prism are used to optimize the polarization of the light beam and adjust the power of the incident light, so that the two transmitted light beams are horizontally linearly polarized light with equal power and perfect polarization. The spatial light modulator is combined with the controller to form Laguerre-Gaussian beams from the two polarized light beams to meet the experimental requirements. The large mirrors are used to change the direction of the two polarized light beams. The rubidium atom cell is used for the interaction between the light beam and the atom, so that the entire light field is in a state of polarization compression, and two compressed Laguerre-Gaussian beams are obtained. The single quarter-wave plate and the single fourth polarization beam splitter prism are combined to make the single compressed Laguerre-Gaussian beam enter the vacuum field, so that the transmitted light and the reflected light have equal power and a single polarization compressed Laguerre-Gaussian beam is obtained. The single balanced homodyne detector is used to measure the compression amount of the single polarization compressed Laguerre-Gaussian beam.

[0007] Further, the laser is set as a frequency-locked power-stable wavelength 795nm laser.

[0008] Further, the balanced homodyne detector includes two detection heads, and a signal processing unit is arranged between the two detection heads.

[0009] A method for generating spatially compressed light array with Laguerre-Gaussian beams, comprising the following steps: The laser releases a laser beam, the laser beam enters a first half-wave plate and a first polarization beam splitter prism in sequence to adjust the angle of the polarization of the light beam, optimize the polarization of the light beam and adjust the power of the incident light, the first beam collector is used to shield the excess light beam of the first polarization beam splitter prism to prevent laser leakage, the optimized polarized light beam enters the combination of a second half-wave plate and a second polarization beam splitter prism in sequence to make the polarized light beam generate two parallel lasers, the position of the laser array is adjusted through a small mirror to form a laser array, the laser array is incident to a spatial light modulator to obtain two Laguerre-Gaussian beam arrays, and according to different holographic images loaded on different positions of the display controller, a Laguerre-Gaussian beam with different orbital angular momenta is obtained to generate two Laguerre-Gaussian beam arrays, the direction and position of the two Laguerre-Gaussian beam arrays are adjusted through two large mirrors, the two Laguerre-Gaussian beam arrays pass through a third half-wave plate and then pass through the same third polarization beam splitter prism, the second beam collector is arranged on the third polarization beam splitter prism to shield the excess light beam of the third polarization beam splitter prism, and then accurately incident to the center of the rubidium atom chamber, the Laguerre-Gaussian light and the atoms in the rubidium atom chamber interact in the rubidium atom chamber to generate compression, and two compressed Laguerre-Gaussian beams are obtained, the two compressed Laguerre-Gaussian beams enter a quarter-wave plate and a fourth polarization beam splitter prism respectively to form odd-polarized compressed Laguerre-Gaussian beams, and finally the odd-polarized compressed Laguerre-Gaussian beams are measured for compression degree through a single balanced homodyne detector.

[0010] Further, the incident angle of the laser array to the spatial light modulator is set to 3-5°.

[0011] Compared with the prior art, the present application has the following advantages: 1. The present application realizes the collective compression of multiple light beams through the rubidium atom chamber, avoiding the crosstalk problem of the traditional scheme.

[0012] 2. The present application realizes the diffusion and sharing of atomic coherence through the thermal motion of atoms in the rubidium atom chamber, enhances the nonlinear interaction between atoms and light in each channel, realizes the spatial multiplexing of compressed light, and changes the defect that the compressed light beam cannot be spatially split in the traditional scheme.

[0013] 3. In the present application, different spatial mode light channels share the same long-lived atomic coherence created by the coherence diffusion of atoms in all channels, enhancing the nonlinear process responsible for light compression in each channel; even if the laser power is lower than the threshold value of compressed light generation, the compressed light in one light channel can be transferred to other channels, reducing the required optical power for generating compressed light.

[0014] 4. The core configuration of the present application only uses one laser, one rubidium atom chamber and one spatial light modulator to generate multiple compressed lights. Compared with the traditional scheme, which uses multiple independent light sources, each light source includes a parametric nonlinear crystal and a resonant cavity to generate a compressed light, the present application greatly reduces the cost of generating multiple compressed lights.

[0015] 5. The present application combines the spatial light modulator with the display controller to realize dynamic mode regulation. The spatial light modulator supports the display controller to load different holograms in real time, and flexibly generates multiple orbital angular momentum modes. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of the present application; Figure 2 is a schematic diagram of the interaction between light and atoms in the rubidium atom chamber of the present application; Figure 3 is a hologram a loaded on the spatial light modulator when generating two light beams in the present application, and a Laguerre-Gaussian beam diagram b obtained; Figure 4 is a hologram a loaded on the spatial light modulator when generating a four-beam light array in the present application, and a simulated Laguerre-Gaussian beam diagram b obtained; Figure 5 is a hologram a loaded on the spatial light modulator when generating a nine-beam light array in the present application, and a simulated Laguerre-Gaussian beam diagram b obtained; In the figure, laser 1, first half-wave plate 2, first polarization beam splitter prism 3, first beam collector 4, second half-wave plate 5, second polarization beam splitter prism 6, small mirror 7, spatial light modulator 8, large mirror 9, third half-wave plate 10, third polarization beam splitter prism 11, second beam collector 12, rubidium atom chamber 13, quarter-wave plate 14, fourth polarization beam splitter prism 15, balanced homodyne detector 16, display controller 17. DETAILED DESCRIPTION

[0017] In order to further illustrate the technical scheme of the present application, the present application will be further described below through examples. Examples

[0018] As Figure 1A system for generating spatially compressed light array with Laguerre-Gaussian beams, comprising a laser 1, a first half-wave plate 2, a first polarization beam splitter prism 3, a first beam collector 4, a second half-wave plate 5, a second polarization beam splitter prism 6, a small mirror 7, a spatial light modulator 8, two large mirrors 9, a third half-wave plate 10, two third polarization beam splitter prisms 11, a second beam collector 12, a rubidium atom cell 13, two quarter-wave plates 14, two fourth polarization beam splitter prisms 15, and two balanced homodyne detectors 16. The laser 1 is used to emit a light beam, and the first half-wave plate 2, the first polarization beam splitter prism 3, the second half-wave plate 5, the second beam collector 12, the spatial light modulator 8, the pair of large mirrors 9, the third half-wave plate 10, the third polarization beam splitter prism 11, the rubidium atom cell 13, the two quarter-wave plates 14, the two fourth polarization beam splitter prisms 15, and the two balanced homodyne detectors 16 are arranged in sequence on a transmission path of the light beam, and the first beam collector 4 and the second beam collector 12 are arranged on one side of the first polarization beam splitter prism and the third polarization beam splitter prism 11 respectively, the small mirror 7 is arranged on one side of the second polarization beam splitter prism 6, and the spatial light modulator 8 is connected to a display controller 17 in a wired manner. The first half-wave plate 2 is combined with the first polarization beam splitter prism 3, the second half-wave plate 5 is combined with the second polarization beam splitter prism 6, and the third half-wave plate 10 is combined with the third polarization beam splitter prism 11, so as to optimize the polarization of the light beam and adjust the power of the incident light, so that the two transmitted light beams are horizontally linearly polarized light beams with equal power and perfect polarization. The spatial light modulator 8 is combined with the controller to form Laguerre-Gaussian beams required by experiments from the two polarized light beams, so as to meet the experimental requirements. The large mirrors 9 are used to change the directions of the two polarized light beams. The rubidium atom cell 13 is used for interaction between the light beam and the atom, so that the entire light field is in a polarization compression state, and two compressed Laguerre-Gaussian beams can be obtained. The single quarter-wave plate 14 is combined with the single fourth polarization beam splitter prism 15 to make the single compressed Laguerre-Gaussian beam transmitted into a vacuum field with equal power of transmitted light and reflected light, and a single polarization compressed Laguerre-Gaussian beam is obtained. The single balanced homodyne detector 16 is used to measure the compression amount of the single polarization compressed Laguerre-Gaussian beam.

[0019] The laser 1 is arranged as a frequency-locked power-stable wavelength 795nm laser 1.

[0020] The balanced homodyne detector 16 comprises two detection heads, and a signal processing unit is arranged between the two detection heads.

[0021] A method for generating a spatially compressed light array by using Laguerre-Gaussian beams, characterized in that it comprises the following steps: The laser 1 releases a laser beam, which enters a first half-wave plate 2 and a first polarization beam splitter prism 3 in sequence to adjust the angle of the polarization of the light beam, optimize the polarization of the light beam, and adjust the power of the incident light. The first beam collector 4 is used to shield the excess light beam of the first polarization beam splitter prism 3 to prevent laser leakage. The optimized polarized light beam enters a second half-wave plate 5 and a second polarization beam splitter prism 6 in sequence to make the polarized light beam generate two laser beams. The position of the laser beams is adjusted by a small mirror 7 to form a laser array. The laser array is incident on a spatial light modulator 8 to obtain two Laguerre-Gaussian beam arrays. According to different holographic images loaded on the display controller 17 at different positions, Laguerre-Gaussian beams with different orbital angular momenta are obtained to generate two Laguerre-Gaussian beam arrays. The directions and positions of the two Laguerre-Gaussian beam arrays are adjusted by two large mirrors 9. The two Laguerre-Gaussian beam arrays pass through a third half-wave plate 10 and then pass through the same third polarization beam splitter prism 11. The third polarization beam splitter prism 11 is provided with a second beam collector 12 to shield the excess light beam of the third polarization beam splitter prism 11. Subsequently, the two Laguerre-Gaussian beam arrays are precisely incident on the center of a rubidium atom chamber 13. In the rubidium atom chamber 13, the Laguerre-Gaussian beams interact with the atoms in the rubidium atom chamber 13 to generate compression, and two compressed Laguerre-Gaussian beams are obtained. The two compressed Laguerre-Gaussian beams enter a quarter-wave plate 14 and a fourth polarization beam splitter prism, respectively, to form odd-polarized compressed Laguerre-Gaussian beams. Finally, the odd-polarized compressed Laguerre-Gaussian beams are measured for compression degree by a single balanced homodyne detector 16.

[0022] The incident angle of the laser array on the spatial light modulator 8 is set to 3°-5°.

[0023] As shown in Figure 2 and Figure 3 The essence of the double-Lambda system is "2 ground state energy levels + 2 excited state energy levels + symmetrical transition coupling rules", which is indispensable, and corresponds to the atomic energy level structure in Figure 2 . 1. Energy level composition (4 core energy levels, divided into "ground state group" and "excited state group") Ground state energy level group: that is, the lower energy level, composed of two energy levels close to the ground state sub-energy level, usually the same atomic ground state split into Zeeman sub-energy levels by an external magnetic field, referring to Figure 2 |-> and |+> in a. These two energy levels have the following key features: the difference in magnetic quantum number is 2, the energy level satisfies the transition selection rule, and can store "ground state coherence" associated with the atomic population phase.

[0024] Excited state energy level group: namely the upper energy level, composed of 2 energy higher excited state energy levels, usually the hyperfine energy levels formed by the same excited state splitting by hyperfine interaction, referring to Figure 2 |1> and |2> in a. These two energy levels have the following key features: there is a fixed hyperfine splitting Δ, and both satisfy the dipole transition condition with the two ground state energy levels, and can be driven by laser.

[0025] 2. Coupling relationship, namely the core of "double Lambda": two symmetric Λ-type transition paths The "double Lambda" of the double Lambda system is a symmetric coupling path formed by the same group of excited states with two ground states, corresponding to Figure 2 The physical logic of a in the middle; First Λ path (left Λ): ground state |-> ↔ excited state |1>, ground state |-> ↔ excited state |2> (driven by left circularly polarized light); Second Λ path (right Λ): ground state |+> ↔ excited state |1>, ground state |-> ↔ excited state |2> (driven by right circularly polarized light); As can be seen, the double Lambda system is mainly composed of "2 ground state Zeeman sublevels + 2 excited state hyperfine levels + symmetric cross transition coupling", and the four energy levels constitute the basic structure, and the symmetric cross transition coupling is the main feature of the double Lambda system. This configuration can efficiently establish long-lived ground state coherence, and thus the nonlinear interaction between atoms and light is also enhanced, which is the key physical basis for the invention to generate compressed light at low power.

[0026] Left circularly polarized basis vector diagram a: process of establishing atomic coherence; Using circularly polarized light as the coupling basis vector, it shows how linearly polarized pump laser drives atomic transitions and establishes ground state coherence, which is the "preliminary step" of compressed light generation; Polarization decomposition of pump laser: the incident pump laser is x linearly polarized, according to the principle of optics, linearly polarized light can be decomposed into left circularly polarized light σ⁺ and right circularly polarized light σ⁻, which are in phase and have equal amplitude; Transition coupling rules: Left circularly polarized light: driving the dipole transition of ground state |-> and excited states |1>, |2>, with coupling strength Ω₊; Right circularly polarized light: driving the dipole transition of ground state |+> and excited states |1>, |2>, with coupling strength Ω₋; Generation of ground state coherence: Since the left-handed and right-handed circularly polarized light is incident synchronously (from the same linearly polarized laser), the transition processes driven by them are coordinated in time - when the atoms repeatedly transition between |->, |+> and |1>, |2>, the atomic population of |-> and |+> levels forms a stable "phase correlation", i.e. ground state Zeeman coherence, which is the core of enhanced nonlinear interaction and the "energy reserve" of squeezed light generation.

[0027] Right side linear polarization base vector diagram b: generation mechanism of squeezed light The right side diagram shows that the left side circular polarization coupling process is equivalent to a degenerate four-wave mixing (FWM) process in the linear polarization base by base vector transformation, which can more intuitively show the generation path of squeezed light; The base vector transformation is to clearly show the polarization characteristics of the squeezed light, and recombine the original ground states |->, |+> into new linear polarization base vectors: |x>: the coupling ground state corresponding to x-polarized light; |y>: the coupling ground state corresponding to y-polarized light; The transformation does not change the energy level structure and interaction nature of the atom, but only simplifies the interpretation of the nonlinear process.

[0028] Coupling rules of degenerate four-wave mixing (FWM): Incident x-linearly polarized pump laser (original laser): only couples |x> - |1> and |y> - |2> transitions, determined by the energy level selection rule, i.e. the laser energy is only used to drive the atomic transitions of these two paths; Energy conservation and momentum conservation of FWM: In the process of atomic transition from |1> back to |x> and from |2> back to |y>, two photons with equal energy and opposite momentum will be released - both of them are y-polarized, determined by the symmetry of the base vector transformation, and satisfy the energy conservation relationship of "one pump photon transforming into a pair of y-polarized photons"; Essence of squeezed light: This pair of y-polarized photons is a pair of quantum correlated photons - their orthogonal components, amplitudes and phases, have strong correlations, so that the quantum noise of the y-polarized light field is "squeezed" below the shot noise limit. From the point of view of the light field state, the entire light field is in a polarization squeezed state, and the y-polarized component is the detectable squeezed light. Embodiment

[0029] As shown in Figure 4 The optimized polarized light beam enters the combination of the second half-wave plate 5 and the second polarizing beam splitter prism 6 in turn to generate two beams of laser. Two groups of the combination of the second half-wave plate 5 and the second polarizing beam splitter prism 6 are added between the second polarizing beam splitter prism 6 and the small mirror 7, so that one of the two beams of laser generated by the polarizing beam splitter prism 6 is further divided into three beams, and a total of four parallel beams of polarized light are generated. Example

[0030] like Figure 5 As shown, the optimized polarized beam sequentially enters the combination of the second half-wave plate 5 and the second polarizing beam splitter 6 to generate two laser beams. Eight sets of combinations of the second half-wave plate 5 and the second polarizing beam splitter 6 are added between the second polarizing beam splitter 6 and the small reflector 7, so that one of the two laser beams generated by the polarizing beam splitter 6 is further split into eight beams, resulting in a total of nine parallel laser beams generated by the polarized beam.

[0031] The foregoing has shown and described the main features and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0032] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A system for generating a spatially compressed optical array using a Laguerre Gaussian beam, characterized in that: Includes a laser (1), a first half-wave plate (2), a first polarizing beam splitter (3), a first beam collector (4), a second half-wave plate (5), a second polarizing beam splitter (6), a small mirror (7), a spatial light modulator (8), two large mirrors (9), a third half-wave plate (10), two third polarizing beam splitters (11), a second beam collector (12), a rubidium atom chamber (13), two quarter-wave plates (14), two fourth polarizing beam splitters (15), and two balanced zero-beat detectors (16). The laser (1) is used to emit a beam. The first half-wave plate (2), the first polarizing beam splitter (3), the second half-wave plate (5), the second beam collector (12), the spatial light modulator (8), a pair of large mirrors (9), the third half-wave plate (10), the third polarizing beam splitter (11), the rubidium atom chamber (13), two quarter-wave plates (14), two fourth polarizing beam splitters (15), and two balanced zero-beat detectors (16) are arranged on the transmission optical path of the beam. The first beam collector (4) and the second beam collector (12) are respectively arranged on one side of the first polarizing beam splitter and the third polarizing beam splitter (11). The small mirror (7) is arranged on one side of the second polarizing beam splitter (6). The spatial light modulator (8) is wired to the display controller (17). The first half-wave plate (2) combined with the first polarizing beam splitter (3), the second half-wave plate (5) combined with the second polarizing beam splitter (6), and the third half-wave plate (10) combined with the third polarizing beam splitter (11) are used to optimize the polarization of the beam and adjust the power of the incident light so that the two transmitted beams are horizontally polarized light with equal power and perfect polarization. The spatial light modulator (8) combined with the controller is used for the two-beam polarized light formation experiment, which requires a Laguerre Gaussian beam to meet the experimental requirements. The large reflecting mirror (9) is used to change the direction of the two polarized beams; The rubidium atom chamber (13) is used for the interaction between the beam and the atoms, so that the entire light field is in a polarization compression state, thus obtaining two compressed Laguerre Gaussian beams. The combination of a single quarter-wave plate (14) and a single fourth polarization beam splitter (15) makes the transmitted and reflected light power equal when the single-beam compressed Laguerre Gaussian beam enters the vacuum field, and obtains a single-polarization compressed Laguerre Gaussian beam. A single balanced zero-beat detector (16) is used to measure the amount of compression of a Laguerre Gaussian beam that produces single-beam polarization compression.

2. The system for generating a spatially compressed optical array using a Laguerre Gaussian beam according to claim 1, characterized in that: The laser (1) is configured as a power-stabilized laser with a frequency-lockable wavelength of 795 nm.

3. The system for generating a spatially compressed optical array using a Laguerre Gaussian beam according to claim 1, characterized in that: The balanced zero-beat detector (16) includes two detector heads, and a signal processing unit is disposed between the two detector heads.

4. A method for generating a spatially compressed optical array using a Laguerre Gaussian beam, based on any one of claims 1-3, characterized in that... This includes the following steps: The laser (1) releases a laser beam, which sequentially enters a first half-wave plate (2) and a first polarizing beam splitter (3) to adjust the beam polarization angle, optimize the beam polarization, and adjust the power of the incident light. The first beam collector (4) is used to block excess beams from the first polarizing beam splitter (3) to prevent laser leakage. The optimized polarized beam sequentially enters a combination of a second half-wave plate (5) and a second polarizing beam splitter (6), causing the polarized beam to generate two parallel laser beams. The position of these beams is adjusted by a small reflector (7) to form a laser array. The laser array is incident on a spatial light modulator (8) to obtain two Laguerre Gaussian beam arrays. Based on different holographic images loaded at different positions on the display controller (17), Laguerre Gaussian beams with different orbital angular momentum are obtained, thereby generating two Laguerre Gaussian beam arrays. The beams are then passed through two large reflectors. (9) Adjust the direction and position of the two Laguerre Gaussian beam arrays. After the two Laguerre Gaussian beam arrays pass through the third half-wave plate (10), they pass through the same third polarization beam splitter (11). The third polarization beam splitter (11) is equipped with a second beam collector (12) to block the excess beam of the third polarization beam splitter (11). Then, the beams are precisely incident on the center of the rubidium atom chamber (13). In the rubidium atom chamber (13), the Laguerre Gaussian beams interact with the atoms in the rubidium atom chamber (13) to produce compression, resulting in two compressed Laguerre Gaussian beams. The two compressed Laguerre Gaussian beams enter the quarter-wave plate (14) and the fourth polarization reflector prism respectively to form an odd-polarized compressed Laguerre Gaussian beam. Finally, the compression degree of the odd-polarized compressed Laguerre Gaussian beam is measured by a single balanced zero-beat detector (16).

5. The method for generating a spatially compressed optical array using a Laguerre Gaussian beam according to claim 4, characterized in that: The incident angle of the laser array onto the spatial light modulator (8) is set to 3°-5°.

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