Laser beam splitting and combining device based on acousto-optic deflector pair and application thereof

Abstract

The invention belongs to the technical field of laser, and discloses a laser beam splitting and combining device based on an acousto-optic deflector pair and application thereof, and the laser beam splitting and combining device comprises a transmitting optical fiber module, a first acousto-optic deflector, a diaphragm, a second acousto-optic deflector and a receiving optical fiber module which are sequentially arranged; the first acousto-optic deflector and the second acousto-optic deflector are arranged in parallel; the transmitting optical fiber module is used for transmitting laser to the first acousto-optic deflector; the first acousto-optic deflector and the second acousto-optic deflector are used for deflecting, splitting or combining laser beams; the diaphragm is used for blocking secondary diffracted light except the primary diffracted light; and the receiving optical fiber module is used for receiving the laser emitted from the second acousto-optic deflector. Therefore, the technical problems that in the prior art, the laser beam splitting function and the laser beam combining function are mutually independent, two kinds of operation cannot be considered in the same device, and real-time regulation and control over the light beam operation mode are lacked are solved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of laser, more particularly, relates to a laser beam splitting and combining device based on a pair of acousto-optic deflectors and application thereof. BACKGROUND

[0002] In the field of industrial applications, beam splitting and combining technology has a wide range of needs. The current commonly used implementation mainly includes traditional beam splitters, diffractive optical elements (DOE) and spatial light modulators (SLM) and the like.

[0003] Traditional beam splitters rely on a plurality of layers of dielectric films plated on an optical substrate, and through the interference effect of the high and low refractive index materials alternately stacked, the reflection and transmission ratio of the light beam is controlled, thereby realizing beam splitting. However, this way has fixed splitting angle, and the splitting mode cannot be dynamically adjusted after manufacturing is completed, and the splitting precision is limited.

[0004] Diffractive optical elements (DOE) are a technology that modulates the incident light wavefront through a precisely designed microstructure to realize beam deflection, splitting and combining, and have the characteristics of non-mechanical, high precision and integrability. However, the disadvantage is that it cannot actively control the beam splitting and combining mode, and once the DOE is made, the splitting and combining mode is determined; meanwhile, it has the problems of high manufacturing cost and sensitivity to wavelength.

[0005] Spatial light modulators (SLM) are a two-dimensional array, and each pixel in the array can independently modulate the phase, amplitude or polarization state of the incident light. By changing the phase value of each pixel to modulate the wavefront of the incident light, deflection, beam combining and splitting are realized. The disadvantage is that the corresponding speed is slow when changing the splitting and combining mode, the cost is high, the programming is complex when using, the damage threshold is low, and coherent artifacts are generated.

[0006] It is worth noting that in most current technical solutions, the splitting and combining functions are independent of each other, it is difficult to consider both operations in the same device, and there is generally a lack of real-time control capability for the operation mode of the light beam. Therefore, developing an optical control system that can integrate the splitting and combining functions and support flexible adjustment still faces significant technical challenges. SUMMARY

[0007] In view of the above defects or improvement needs of the prior art, the present application provides a laser beam splitting and combining device based on a pair of acousto-optic deflectors and application thereof, thereby solving the technical problems that the laser splitting and combining functions of the prior art are independent of each other, cannot be considered in the same device, and lack real-time control of the operation mode of the light beam. The present application aims to realize the integration of splitting and combining functions; support real-time mode switching of laser beam combining and splitting.

[0008] To achieve the above object, according to one aspect of the present application, a laser beam splitting and combining device based on a pair of acousto-optic deflectors is provided, which comprises a transmitting fiber module, a first acousto-optic deflector, an optical stop, a second acousto-optic deflector and a receiving fiber module arranged in sequence; the acousto-optic medium of the first acousto-optic deflector is arranged in parallel with the acousto-optic medium of the second acousto-optic deflector; The transmitting fiber module is used for transmitting laser beams to the first acousto-optic deflector; the first acousto-optic deflector and the second acousto-optic deflector are used for deflecting, splitting or combining laser beams; the optical stop is used for blocking secondary diffraction light except primary diffraction light; and the receiving fiber module is used for receiving laser beams emitted from the second acousto-optic deflector.

[0009] Preferably, a third acousto-optic deflector is further arranged between the first acousto-optic deflector and the optical stop, and the acousto-optic medium of the first acousto-optic deflector is arranged perpendicularly to the acousto-optic medium of the third acousto-optic deflector; and a fourth acousto-optic deflector is further arranged between the second acousto-optic deflector and the optical stop, and the acousto-optic medium of the second acousto-optic deflector is arranged perpendicularly to the acousto-optic medium of the third acousto-optic deflector.

[0010] Preferably, the transmitting fiber module is a plurality of transmitting fibers arranged in the same plane and at different angles with the first acousto-optic deflector; and the receiving fiber module is a plurality of receiving fibers arranged in the same plane and at different angles with the second acousto-optic deflector.

[0011] Preferably, an incident light straight-through lens is arranged between each transmitting fiber and the first acousto-optic deflector; and an outgoing light collimating lens is arranged between each receiving fiber and the first acousto-optic deflector.

[0012] Preferably, the first acousto-optic deflector and the second acousto-optic deflector each comprise an acousto-optic medium, an ultrasonic transducer, a wideband power amplifier and a signal generator connected in sequence.

[0013] Preferably, the transmitting fiber module is a plurality of transmitting fibers arranged in the same plane and in parallel with each other; and the receiving fiber module is a plurality of receiving fibers arranged in the same plane and in parallel with each other.

[0014] Preferably, a front telecentric lens is arranged between each transmitting fiber and the first acousto-optic deflector; and a rear telecentric lens is arranged between each receiving fiber and the first acousto-optic deflector.

[0015] According to another aspect of the present application, the laser beam splitting and combining device based on a pair of acousto-optic deflectors is applied to fiber addressing.

[0016] In general, the above technical scheme conceived by the present application can achieve the following beneficial effects compared with the prior art: 1. The application realizes the switching of one laser beam into multiple laser beams, multiple laser beams into one laser beam and multiple laser beams into multiple laser beams, and the integration of the splitting and combining functions by setting a first acousto-optic deflector and a second acousto-optic deflector, and arranging the acousto-optic medium of the first acousto-optic deflector and the acousto-optic medium of the second acousto-optic deflector in parallel.

[0017] 2. The application realizes the switching of one laser beam into multiple laser beams, multiple laser beams into one laser beam, and the switching of the position or angle of multiple laser beams into multiple laser beams by setting a third acousto-optic deflector and a fourth acousto-optic deflector, and arranging the acousto-optic medium of the first acousto-optic deflector and the acousto-optic medium of the third acousto-optic deflector perpendicularly, and arranging the acousto-optic medium of the second acousto-optic deflector and the acousto-optic medium of the third acousto-optic deflector perpendicularly.

[0018] 3. The application realizes the arbitrary switching of the angle of laser by setting the transmitting fiber module as several transmitting fibers arranged at different angles in the same plane, and setting the receiving fiber module as several receiving fibers arranged at different angles in the same plane.

[0019] 4. The application realizes the arbitrary switching of the position of laser by setting the transmitting fiber module as several transmitting fibers arranged in parallel in the same plane, and setting the receiving fiber module as several receiving fibers arranged in parallel in the same plane.

[0020] 5. The splitting and combining method and device based on the acousto-optic deflector can actively and flexibly control the splitting and combining mode of light, has the functions of fast response speed, high precision and dynamic control, has a simple overall optical path structure, does not need to be combined with other complex deflection equipment, and can effectively control the cost. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a schematic diagram of the working principle of a single acousto-optic deflector.

[0022] Figure 2 FIG. 2 is a schematic diagram of the principle of a one-dimensional splitting and combining device based on an acousto-optic deflector pair provided by the embodiment 1 of the application.

[0023] Figure 3 FIG. 3 is a schematic diagram of the principle of realizing the function of splitting one laser beam into multiple laser beams by the device provided by the embodiment 1 of the application.

[0024] Figure 4 FIG. 4 is a schematic diagram of the principle of realizing the function of combining multiple laser beams into one laser beam by the device provided by the embodiment 1 of the application.

[0025] Figure 5is the implementation principle schematic diagram of the device provided by embodiment 1 of the application for realizing the function of adjusting the light beam distribution of multiple beams to multiple beams.

[0026] Figure 6 is the principle schematic diagram of a one-dimensional beam splitting and combining device based on a pair of acousto-optic deflectors provided by embodiment 2 of the application.

[0027] Figure 7 is the schematic diagram of a two-dimensional beam splitting and combining device based on a pair of acousto-optic deflectors provided by embodiment 3 of the application.

[0028] Figure 8 is the schematic diagram of a two-dimensional beam splitting and combining device based on a pair of acousto-optic deflectors provided by embodiment 4 of the application.

[0029] In all the drawings, the same reference signs are used to represent the same elements or structures, wherein: 1.1 is an acousto-optic medium; 1.2 is an ultrasonic transducer; 1.3 is a wideband power amplifier; 1.4 is a signal generator; 2.1 is a first acousto-optic deflector; 2.2 is a second acousto-optic deflector; 2.3 is a combination of transmission optical fibers and collimating lenses placed at different angles in the same plane; 2.4 is a combination of receiving optical fibers and collimating lenses placed at different angles in the same plane; 2.9 is a diaphragm; 2.10 is an array of parallel transmission optical fibers; 2.11 is an array of parallel receiving optical fibers; 2.12 is a front telecentric lens; 2.13 is a rear telecentric lens; 3.1 is a third acousto-optic deflector; 3.2 is a fourth acousto-optic deflector. DETAILED DESCRIPTION In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0030] The present application provides a laser beam splitting and combining device based on a pair of acousto-optic deflectors, comprising a transmission optical fiber module, a first acousto-optic deflector, a diaphragm, a second acousto-optic deflector and a receiving optical fiber module placed in sequence; the first acousto-optic deflector and the second acousto-optic deflector are arranged in parallel; The transmission optical fiber module is used to emit laser to the first acousto-optic deflector; the first acousto-optic deflector and the second acousto-optic deflector are used for deflection, splitting or combining of laser beams; the diaphragm is used to block stray light diffracted at other levels; the receiving optical fiber module is used to receive laser emitted from the second acousto-optic deflector.

[0031] In some embodiments, a third acousto-optic deflector is arranged between the first acousto-optic deflector and the diaphragm, and the first acousto-optic deflector is arranged perpendicularly to the third acousto-optic deflector; a fourth acousto-optic deflector is arranged between the second acousto-optic deflector and the diaphragm, and the second acousto-optic deflector is arranged perpendicularly to the third acousto-optic deflector.

[0032] The structure of a single acousto-optic deflector is shown in Fig. (a) in the accompanying drawings, which comprises an acousto-optic medium 1.1, a transducer 1.2, a broadband power amplifier 1.3, and a signal generator 1.4. Figure 1

[0033] The signal generator is used to generate an electric driving signal with one frequency or multiple frequencies superimposed; the electric driving signal is amplified by the broadband power amplifier and then input into the ultrasonic transducer to be converted into an ultrasonic signal; the ultrasonic signal is input into the acousto-optic medium to generate a grating; the light beam is subjected to Bragg diffraction in the grating generated by the corresponding different frequency signals, so as to realize deflection of the incident light in different directions.

[0034] Further, the driving signal is converted into N single-frequency ultrasonic signals by the ultrasonic transducer:

[0035] wherein , , are the amplitude, frequency, and phase of the single-frequency ultrasonic signal , respectively, is the time variable of the ultrasonic signal function; and is the linear superposition of all single-frequency signals. The collimated light beam with a frequency of is incident into the acousto-optic medium to interact with the ultrasonic field to generate frequency shift:

[0036] wherein represents first-order diffraction, and represents negative first-order diffraction.

[0037] The deflection angle of the outgoing light beam subjected to Bragg diffraction in the acousto-optic medium can be expressed as:

[0038] wherein is the wavelength of the incident laser beam, is the speed of sound in the acousto-optic medium, and is the frequency difference between the outgoing light beam and the incident light beam.

[0039] Therefore, by adjusting the frequency of the driving signal, the deflection angle of the outgoing light beam can be controlled.​

[0040] When an acousto-optic deflector diffracts a light beam, there exists a diffraction efficiency, which is the proportion of incident light power converted into the required first-order diffracted light. The formula for calculating this efficiency is:

[0041] In the formula The wavelength of the incident laser; The acoustic-optical excellence value is determined by the properties of the material itself. The effective distance at which the laser beam interacts with the acoustic field inside the crystal; The power of the radio frequency signal applied to the AOD transducer.

[0042] The power lost during beam deflection is converted into stray light from other diffraction orders, material heating, and other aspects.

[0043] For the beam combining function of acousto-optic deflectors, such as Figure 1 As shown in (a), the input frequency is... , The drive signal, to , The beams incident on the acousto-optic deflector at different angles are combined into a single output beam, satisfying the following:

[0044]

[0045] Similarly, if the input drive signal contains frequency... This allows multiple beams of light to be combined into one beam.

[0046] For the beam splitting function of acousto-optic deflectors, such as Figure 1 As shown in (b), input beam 104 is simultaneously input to the acousto-optic deflector with a frequency of , The driving signal outputs two beams with angles of respectively. , The split beams are 10⁵ and 10⁶, satisfying:

[0047]

[0048] Similarly, if the input frequency is The driving signal can then output an angle of... The beam of light is split.

[0049] Example 1 like Figure 2A one-dimensional beam splitting and combining device based on an acousto-optic deflector pair used in the present application is shown in the schematic diagram, which comprises: 2.1 is a first acousto-optic deflector; 2.2 is a second acousto-optic deflector; 2.3 is a combination of emitting optical fibers and collimating lenses placed at different angles in the same plane; 2.4 is a combination of receiving optical fibers and collimating lenses placed at different angles in the same plane; 2.9 is an optical stop; 201, 202, 203 are light beams incident at different angles on the first acousto-optic deflector in the same plane; 204, 205, 206 are light beams of different angles emitted from the second acousto-optic deflector; and 207 is a combined light beam emitted from the first acousto-optic deflector; The first acousto-optic deflector 2.1 deflects the light beams incident at different angles in the y direction to combine them into a horizontal light beam; The second acousto-optic deflector deflects the combined horizontal incident single light beam in the y direction as required to split it into receiving optical fibers; the optical stop 2.9 is used to block other orders of diffracted stray light; The schematic diagram of the implementation principle of the function of splitting one light beam into multiple light beams is as follows: Figure 3 As shown: the incident light 208 is at an angle of The first acousto-optic deflector 2.1 is incident, and a driving signal with a frequency of is input to the first acousto-optic deflector 2.1, so that the input light beam 208 is deflected to the horizontal direction after passing through the first acousto-optic deflector 2.1; the horizontal light beam 209 is incident on the second acousto-optic deflector 2.2, and a driving signal with a frequency of , , is input to the second acousto-optic deflector 2.2 to split the incident light into three light beams with angles of , 0, , respectively, which enter the corresponding receiving optical fibers. Thus, the splitting of one light beam with a selectable incident angle into multiple light beams with selectable angles and quantities is achieved. It is worth noting that Figure 3 the embodiment in the present application is splitting one light beam into three light beams, but the present method is not limited to splitting one light beam into three light beams, and by changing the driving frequencies of the first acousto-optic deflector 2.1 and the second acousto-optic deflector 2.2, one-to-many splitting with selectable quantities and angles can be achieved.

[0050] The schematic diagram of the implementation principle of the function of combining multiple light beams into one light beam is as follows: Figure 4 As shown: the light beams 213, 214 are incident at angles of , , respectively, a driving signal with a frequency of , is input to the first acousto-optic deflector 2.1 to combine the light beams 213, 214 into a horizontal light beam 215; the light beam 215 is incident on the second acousto-optic deflector 2.2, and a driving signal with a frequency of of the light beams, into the receiving optical fiber. Thus, the beam combining of multiple beams with selectable incident angles and quantities into one beam with selectable output angle is realized. It is worth mentioning that, two beams into one beam, but the method is not limited to the beam combining of two beams into one beam. By changing the driving frequencies of the first acousto-optic deflector 2.1 and the second acousto-optic deflector 2.2, the beam combining of multiple beams with selectable quantities and angles into one beam can be realized. Figure 4 The principle diagram of the device for realizing the function of adjusting the distribution of multiple beams is shown in

[0051] The light beams 217, 218, and 219 are incident on the first acousto-optic deflector 2.1 at angles of Figure 5 , 0, , , respectively. The driving signals with frequencies of , , are input to the first acousto-optic deflector 2.1, so that the light beams 217, 218, and 219 are combined into a horizontal light beam 220. The driving signals with frequencies of , , are input to the second acousto-optic deflector 2.2, and the output angle is , 0, . Thus, the light beams enter the receiving optical fiber. Thus, the function of changing the deflection angle of multiple beams with different incident angles and adjusting the distribution of light beams is realized. It is worth mentioning that, Figure 5 three beams into three beams, but the method is not limited to the adjustment of three beams into three beams. By changing the driving frequencies of the first acousto-optic deflector 2.1 and the second acousto-optic deflector 2.2, the adjustment of multiple beams with selectable quantities and angles into multiple beams can be realized, and the number of incident light beams does not need to be equal to the number of output light beams.

[0052] Embodiment 2 As shown in Figure 6 , it is a schematic diagram of a one-dimensional beam splitting and combining device based on an acousto-optic deflector pair used in the example of the present application, The device comprises a transmitting optical fiber array 2.10, a front telecentric lens 2.12, a first acousto-optic deflector 2.1, a light barrier 2.9, a second acousto-optic deflector 2.2, a rear telecentric lens 2.13, and a receiving optical fiber array 2.11 arranged in sequence; the first acousto-optic deflector 2.1 and the second acousto-optic deflector 2.2 are arranged in parallel; The first acousto-optic deflector 2.1 deflects the light beams with different incident angles in the y direction, so that they are combined into a horizontal beam; The second acousto-optic deflector 2.2 deflects the horizontally incident single light beam in the y direction as required, so that the light beam is split into the receiving optical fiber; the diaphragm 2.9 is used to block the stray light of other orders of diffraction; The front telecentric lens 2.12 makes the light beams emitted by the array of transmitting optical fibers incident at different angles into the first acousto-optic deflector; the rear telecentric lens 2.13 converges the light beams emitted at different angles into the corresponding receiving optical fiber; through the parallel array of transmitting optical fibers and the parallel array of receiving optical fibers, the laser position can be switched arbitrarily, and the same can be achieved for splitting a light beam into multiple light beams, converging multiple light beams into one light beam, and adjusting the distribution of multiple light beams, and the principle is the same as Figure 3 、 Figure 4 、 Figure 5 .

[0053] Embodiment 3 As Figure 7 shown is a schematic diagram of a two-dimensional splitting and converging device based on an acousto-optic deflector pair used in the examples of the application, which comprises a combination of transmitting optical fibers and collimating lenses placed at different angles in the same plane 2.3, a first acousto-optic deflector 2.1, a third acousto-optic deflector 3.1, a diaphragm 2.9, a fourth acousto-optic deflector 3.2, and a second acousto-optic deflector 2.2 arranged in sequence; the first acousto-optic deflector 2.1 and the third acousto-optic deflector 3.1 are placed vertically, and the second acousto-optic deflector 2.2 and the fourth acousto-optic deflector 3.2 are placed vertically.

[0054] The first acousto-optic deflector 2.1 is used for y direction deflection of the incident light beam, the third acousto-optic deflector 3.1 is used for x direction deflection of the light beam emitted by the first acousto-optic deflector 2.1, the fourth acousto-optic deflector 3.2 is used for x direction deflection of the light beam emitted by the third acousto-optic deflector 3.1, and the second acousto-optic deflector 2.2 is used for y direction deflection of the light beam emitted by the fourth acousto-optic deflector 3.2; 301, 302, and 303 are light beams emitted by the transmitting optical fibers; 304, 305, and 306 are light beams emitted from the first acousto-optic deflector 2.1 and incident on the third acousto-optic deflector 3.1; 307 is a light beam emitted from the third acousto-optic deflector 3.1 and incident on the fourth acousto-optic deflector 3.2; 308 and 309 are light beams emitted from the fourth acousto-optic deflector 3.2 and incident on the second acousto-optic deflector 2.2; and 310, 311, 312, and 313 are light beams emitted from the second acousto-optic deflector 2.2.

[0055] The first acousto-optic deflector 2.1 and the third acousto-optic deflector 3.1 are placed perpendicularly. The first acousto-optic deflector 2.1 is responsible for deflecting the light beam in the y-direction, and the third acousto-optic deflector 3.1 is responsible for deflecting the light beam in the x-direction, thereby achieving free deflection of the light beam in both horizontal and vertical dimensions. When multiple beams of light are incident at different angles, they are first deflected in the y-direction so that all beams are deflected at the same angle in the y-direction and become coplanar; then they are deflected in the x-direction so that all beams are combined into one beam.

[0056] The second acousto-optic deflector 2.2 and the fourth acousto-optic deflector 3.2 are placed perpendicularly to each other and are used to deflect and split the beam obtained by combining the beams of the first orthogonal acousto-optic deflector as needed. Two-dimensional deflection and beam splitting control is achieved through the two acousto-optic deflectors with deflection directions of x and y axes respectively.

[0057] The two-dimensional beam splitting and combining functions in this embodiment are implemented in the following manner: (e.g.) Figure 7 The diagram shows three to four beams of light. Beams 301, 302, and 303 are emitted from the transmitting fiber and incident at different angles. The first acousto-optic deflector 2.1 assigns frequencies to the y-direction deflection angles of the three corresponding beams 301, 302, and 303, ensuring that the y-direction deflection angles of beams 301, 302, and 303 are all 0 when they exit the beam. Figure 7 As shown in beams 304, 305, and 306; then, the third acousto-optic deflector 3.1 is given the frequency of the x-direction deflection angle of the three corresponding beams 304, 305, and 306, so that the deflection angle of all beams in the x-direction is 0, and the beams are combined into one beam upon exiting, as shown in the image. Figure 7 As shown in beam 307, the fourth acousto-optic deflector 3.2 and the second acousto-optic deflector 2.2 deflect beam 307 in the x and y directions as required, and finally guide it into the designated receiving optical fiber.

[0058] It is worth noting that the functionality of this embodiment is not limited to... Figure 7 The arrangement shown is not simply a rearrangement from three beams to four beams, but can also satisfy the beam splitting and combining operations of any number and any angle of input beams within a certain range in a two-dimensional direction to any number and any angle of output beams within a certain range.

[0059] Example 4 like Figure 8 The diagram shows a schematic of a two-dimensional beam splitting and combining device based on an acousto-optic deflector pair used in an example of the present invention. Unlike embodiment 3, the combination of transmitting optical fibers and their collimating lenses placed at different angles on the same plane is replaced by a parallel transmitting optical fiber array 2.10 and a front telecentric lens 2.12; the combination of receiving optical fibers and their collimating lenses placed at different angles on the same plane is replaced by a parallel receiving optical fiber array 2.11 and a rear telecentric lens 2.13. The transmitting fiber array 2.10 and the receiving fiber array 2.11 are distributed in two directional dimensions, respectively. The front telecentric lens 2.12 directs the light beam emitted from the transmitting fiber array 2.10 into the first acousto-optic deflector 2.1 at different angles; the rear telecentric lens 2.13 converges the light beams exiting at different angles into the corresponding receiving fiber array 2.11. All other components are... Figure 7 Similarly, the principles of beam splitting and beam combining are also the same. Figure 7 Similarly, the laser position can be arbitrarily switched using parallel arrays of transmitting and receiving fibers. This arrangement of transmitting and receiving fibers on a two-dimensional plane is more common in practical scenarios.

[0060] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A laser beam splitter / combiner based on an acousto-optic deflector pair, characterized in that, It includes a transmitting fiber module, a first acousto-optic deflector, an aperture, a second acousto-optic deflector, and a receiving fiber module, which are placed in sequence; the acousto-optic medium of the first acousto-optic deflector and the acousto-optic medium of the second acousto-optic deflector are arranged in parallel. The transmitting fiber module is used to transmit laser light to the first acousto-optic deflector; the first acousto-optic deflector and the second acousto-optic deflector are used to deflect, split, or combine the laser beam; the aperture is used to block secondary diffraction light other than the first-order diffraction light; the receiving fiber module is used to receive the laser light emitted from the second acousto-optic deflector.

2. The laser beam splitter / combiner based on an acousto-optic deflector pair as described in claim 1, characterized in that, A third acousto-optic deflector is also provided between the first acousto-optic deflector and the aperture, and the acousto-optic medium of the first acousto-optic deflector and the acousto-optic medium of the third acousto-optic deflector are placed perpendicularly; a fourth acousto-optic deflector is also provided between the second acousto-optic deflector and the aperture, and the acousto-optic medium of the second acousto-optic deflector and the acousto-optic medium of the third acousto-optic deflector are placed perpendicularly.

3. A laser beam splitter / combiner based on an acousto-optic deflector pair as described in claim 1 or 2, characterized in that, The transmitting fiber module consists of several transmitting fibers placed on the same plane at different angles from the first acousto-optic deflector; the receiving fiber module consists of several receiving fibers placed on the same plane at different angles from the second acousto-optic deflector.

4. A laser beam splitter / combiner based on an acousto-optic deflector pair as described in claim 3, characterized in that, An incident light straight lens is provided between each of the transmitting optical fibers and the first acousto-optic deflector; an outgoing light collimating lens is provided between each of the receiving optical fibers and the first acousto-optic deflector.

5. A laser beam splitter / combiner based on an acousto-optic deflector pair as described in claim 1 or 2, characterized in that, Both the first and second acousto-optic deflectors consist of an acousto-optic medium, an ultrasonic transducer, a broadband power amplifier, and a signal generator connected in sequence.

6. A laser beam splitter / combiner based on an acousto-optic deflector pair as described in claim 1 or 2, characterized in that, The transmitting fiber module consists of several transmitting fiber arrays placed parallel to each other on the same plane; the receiving fiber module consists of several receiving fiber arrays placed parallel to each other on the same plane.

7. A laser beam splitter / combiner based on an acousto-optic deflector pair as described in claim 6, characterized in that, A front telecentric lens is provided between the transmitting fiber array and the first acousto-optic deflector; a rear telecentric lens is provided between the receiving fiber array and the second acousto-optic deflector.

8. The application of a laser beam splitter / combiner based on an acousto-optic deflector pair as described in any one of claims 1 to 7, characterized in that, It is applied to fiber optic addressing.

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