A two-dimensional acousto-optic device

Abstract

The present invention relates to the field of optoelectronics technology, and discloses a two-dimensional acousto-optic device, comprising a bracket, a housing, an acousto-optic medium, a first transducer, a second transducer, and a matching circuit. The acousto-optic medium comprises a first mounting surface, a second mounting surface, a light-transmitting surface, a first reflective surface, a second reflective surface, and an inclined surface. The first mounting surface is adjacent to and perpendicular to the second mounting surface, the light-transmitting surface is perpendicular to the first mounting surface and the second mounting surface, respectively. The first reflective surface, the second reflective surface, and the inclined surface are all rough surfaces, and the inclined surface is at an angle to the light-transmitting surface and is not perpendicular. The first transducer is mounted on the first mounting surface, and the second transducer is mounted on the second mounting surface. As rough surfaces, the first reflective surface, the second reflective surface, and the inclined surface scatter most sound waves. Since the inclined surface is at an angle to the light-transmitting surface and is not perpendicular, the sound waves reflected by the inclined surface have difficulty passing through the region of incident light. The incident light does not enter the refractive index grating formed by the reflected sound wave at a Bragg angle, and thus does not cause multiple diffractions.

Description

Technical Field

[0001] The present invention relates to the field of optoelectronic technology, and in particular to a two-dimensional acousto-optic device. Background Art

[0002] The acousto-optic Q-switch is a key component that performs Q-switching within a laser cavity. It has been widely used in laser marking machines, laser cutting machines, and other fields. It can rapidly Q-switched continuous laser light to a high-power pulsed laser of the desired frequency. The acousto-optic Q-switch operates on the acousto-optic effect. When ultrasound passes through a crystal, it alters its optical properties, causing its refractive index to change, forming a distribution that varies with the intensity of the ultrasound. The entire crystal acts as a refractive index grating, diffracting the incident laser light.

[0003] Existing two-dimensional acousto-optic Q-switches utilize two mutually perpendicular transducers to generate ultrasonic waves, altering the refractive index of the acousto-optic medium and Q-switching the laser light. The ultrasonic waves are then processed by a sound-absorbing surface. As the ultrasonic waves propagate through the acousto-optic medium, the sound waves reflected by the medium reach the working area where the laser passes, causing the incident light to undergo multiple diffraction events. This means that the reflected sound waves cause the incident light to diffract twice, ultimately resulting in multiple diffraction events. Furthermore, since the sound waves reflect back and forth within the acousto-optic medium for a distance before reaching the incident light and causing it to diffract, which takes several microseconds, when the transducers are turned off, the incident light is diffracted for several more microseconds. This increases the on-time of the acousto-optic device when used as a Q-switch. When the acousto-optic device is used for Q-switching within a laser cavity, the increased on-time slows the laser's light output, preventing it from generating high-repetition-rate pulsed laser light. Summary of the Invention

[0004] The purpose of the present invention is to provide a two-dimensional acousto-optic device to avoid the phenomenon that the ultrasonic wave of the two-dimensional acousto-optic Q switch is reflected multiple times in the acousto-optic medium and causes the laser to be diffracted multiple times, thereby reducing the device response time and improving the overall performance of the device.

[0005] To achieve the above-mentioned object, the present invention provides a two-dimensional acousto-optic device, comprising a bracket and a housing fixedly connected to the bracket, wherein the housing and the bracket enclose an assembly cavity, and the two-dimensional acousto-optic device further comprises an acousto-optic medium, a first transducer, a second transducer, and a matching circuit disposed in the assembly cavity;

[0006] The acousto-optic medium comprises a first mounting surface, a second mounting surface, a light-transmitting surface, a first reflecting surface, a second reflecting surface and an inclined surface, wherein the first mounting surface and the second mounting surface are adjacently arranged and perpendicular to each other, the light-transmitting surface is perpendicular to the first mounting surface and the second mounting surface respectively, there are two light-transmitting surfaces and they are parallel to each other, the first reflecting surface and the second mounting surface are adjacently arranged, the second reflecting surface and the first mounting surface are adjacently arranged, the inclined surface connects the first reflecting surface, the second reflecting surface and the light-transmitting surface, the first reflecting surface, the second reflecting surface and the inclined surface are all rough surfaces, and the inclined surface forms an angle with the light-transmitting surface and is not perpendicular;

[0007] The first transducer is mounted on the first mounting surface, the second transducer is mounted on the second mounting surface, and both the first transducer and the second transducer are electrically connected to the matching circuit.

[0008] Preferably, the included angle between the inclined surface and the light-transmitting surface is defined as α, α≥90+10θ, where θ is the Bragg angle.

[0009] Preferably, the dimension of the second assembly surface in a direction perpendicular to the first assembly surface is defined as h, and the distance between the center point of the inclined surface and the first assembly surface is defined as L, where L≥2h.

[0010] Preferably, the included angle between the first assembly surface and the second reflection surface is β, the included angle between the second assembly surface and the first reflection surface is γ, and 120°≤β≤150°, and 120°≤γ≤150°.

[0011] Preferably, the first reflecting surface and the second reflecting surface are parallel to each other.

[0012] Preferably, the roughness of the rough surface is Ra, and Ra>0.1.

[0013] Preferably, the two-dimensional acousto-optic device further includes a first heat sink, a second heat sink, a first bonding plate and a second bonding plate, the first heat sink contacts the second reflecting surface, the second heat sink contacts the first reflecting surface, the first bonding plate is fixedly assembled on the first heat sink, the second bonding plate is fixedly assembled on the second heat sink, the first bonding plate and the first transducer are electrically connected as well as the second bonding plate and the second transducer via gold wires, and the first bonding plate and the second bonding plate are electrically connected to the matching circuit via wires.

[0014] Preferably, the bracket also has a receiving groove, which is arranged at a position opposite to the first transducer, the second transducer, the first wire bonding plate, and the second wire bonding plate, and the first transducer, the second transducer, the first wire bonding plate, and the second wire bonding plate are embedded in the receiving groove.

[0015] Preferably, the two-dimensional acousto-optic device further includes a water-cooling joint, which is fixedly assembled on a side of the housing facing away from the assembly cavity. Water cooling channels are respectively provided in the first heat dissipation block and the second heat dissipation block, and the water-cooling joint is connected to the water cooling channels.

[0016] Compared with the prior art, a two-dimensional acousto-optic device according to an embodiment of the present invention has the following advantages: a matching circuit sends a signal to a first transducer mounted on a first mounting surface of an acousto-optic medium and a second transducer mounted on a second mounting surface. When the ultrasonic waves generated by the first and second transducers propagate within the acousto-optic medium, the ultrasonic waves are first reflected on the first and second reflection surfaces, respectively. Since the first and second reflection surfaces of the acousto-optic medium are both rough surfaces, the first and second reflection surfaces scatter a portion of the sound waves, and the remaining sound waves continue to reflect onto the inclined surface, which is also a rough surface, further scattering the sound waves. Most of the sound waves are eliminated; in addition, since there is an angle between the inclined surface and the light-passing surface and they are not perpendicular, the sound waves reflected by the inclined surface will not be parallel to the light-passing surface, and the reflected sound waves are unlikely to pass through the area of ​​the incident light, and will not change the refractive index of the acousto-optic medium in the area where the incident light passes. Even if a small amount of sound waves pass through the area of ​​the incident light, since the sound waves at this time are not parallel to the light-passing surface, the incident light will not enter the refractive index grating formed by the reflected sound waves at the Bragg angle. Therefore, the reflected sound waves will not cause multiple diffraction of the incident light, nor will the reflected sound waves increase the opening time of the acousto-optic device, thereby ensuring that the laser can generate high-repetition-rate pulsed lasers. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of a two-dimensional acousto-optic device of the present invention;

[0018] Figure 2 yes Figure 1 Rear view of the two-dimensional acousto-optic device;

[0019] Figure 3 yes Figure 1 A schematic structural diagram of a bracket for a two-dimensional acousto-optic device;

[0020] Figure 4 yes Figure 1 Schematic diagram of the structure of the acousto-optic medium of the two-dimensional acousto-optic device;

[0021] Figure 5 yes Figure 4 A bottom view of the acousto-optic medium of the two-dimensional acousto-optic device;

[0022] Figure 6 yes Figure 4 Schematic diagram of the ultrasonic reflection path in the acousto-optic medium.

[0023] In the figure, 1. bracket, 2. shell, 21. light hole, 3. acousto-optic medium, 31. first assembly surface, 32. second assembly surface, 33. light-transmitting surface, 34. first reflection surface, 35. second reflection surface, 36. inclined surface, 4. first transducer, 5. second transducer, 6. matching circuit, 7. assembly cavity, 8. RF connector, 9. first heat sink, 10. second heat sink, 11. first bonding board, 12. second bonding board, 13. gold wire, 14. wire, 15. receiving groove, 16. water-cooling connector, 17. temperature control connector. DETAILED DESCRIPTION

[0024] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0025] A preferred embodiment of a two-dimensional acousto-optic device of the present invention is as follows: Figures 1 to 6 As shown, the two-dimensional acousto-optic device includes a bracket 1, a housing 2, an acousto-optic medium 3, a first transducer 4, a second transducer 5, and a matching circuit 6. The bracket 1 and the housing 2 are fixedly connected. The bracket 1 has an L-shaped structure. The housing 2 and the bracket 1 enclose an assembly cavity 7. The acousto-optic medium 3, the first transducer 4, the second transducer 5, and the matching circuit 6 are all disposed within the assembly cavity 7. The bracket 1 and the housing 2 provide protection for the components therein. The housing also has two coaxial light holes 21 for incident light to pass through.

[0026] The acousto-optic medium 3 is used to transmit ultrasonic waves and incident light. The first and second transducers 4 and 5 are used to generate ultrasonic waves. The acousto-optic medium 3, the first and second transducers 4 and 5 are fixedly connected and then fixedly connected to the bracket 1. The matching circuit 6 is fixedly connected to the housing 2 and electrically connected to the first and second transducers 4 and 5, respectively, to control the generation of ultrasonic waves by the first and second transducers 4 and 5. When ultrasonic waves propagate within the crystal, they change the optical properties of the crystal, causing the refractive index of the crystal to change, forming a refractive index grating. When incident light enters the acousto-optic medium 3 at the Bragg angle and passes through the refractive index grating, it is diffracted. In this embodiment, the housing 2 is also provided with a radio frequency connector 8, which is electrically connected to the matching circuit 6 to transmit signals to the matching circuit 6.

[0027] The specific material of the acousto-optic medium 3 can be selected as needed, and may be fused quartz, lithium niobate, etc. The acousto-optic medium 3 comprises a first mounting surface 31, a second mounting surface 32, a light-transmitting surface 33, a first reflective surface 34, a second reflective surface 35, and an inclined surface 36. The first mounting surface 31 and the second mounting surface 32 are adjacent and perpendicular to each other. The light-transmitting surface 33 is perpendicular to the first mounting surface 31 and the second mounting surface 32, respectively. There are two light-transmitting surfaces 33, which are parallel to each other. That is, the two light-transmitting surfaces 33 are two parallel outer surfaces of the acousto-optic medium 3. The light-transmitting surfaces 33 are perpendicular to the first mounting surface 31 and the second mounting surface 32, and are adjacent to each other. In this embodiment, the first mounting surface 31, the second mounting surface 32, and the light-transmitting surface 33 are polished to ensure their surface smoothness.

[0028] The first transducer 4 is fixedly mounted on the first mounting surface 31, and the second transducer 5 is fixedly mounted on the second mounting surface 32. The first transducer 4 is arranged in close contact with the first mounting surface 31. The first transducer 4 is used to generate ultrasonic waves and transmit them into the acousto-optic medium 3 via the first mounting surface 31. The second transducer 5 is used to generate ultrasonic waves and transmit them into the acousto-optic medium 3 via the second mounting surface 32. Because the first mounting surface 31 and the second mounting surface 32 are both perpendicular to the light-transmitting surface 33, the directions of the ultrasonic waves generated by the first transducer 4 and the second transducer 5 are respectively perpendicular to the first mounting surface 31 and the second mounting surface 32. When the incident light meets the Bragg angle, diffraction occurs within the acousto-optic medium 3.

[0029] The main principle of the acousto-optic device is that the matching circuit 6 transmits the electrical signal to the first transducer 4 and the second transducer 5 on the acousto-optic medium 3. The ultrasonic waves generated by the first transducer 4 and the second transducer 5 will cause the refractive index of the acousto-optic medium 3 to change periodically, forming a refractive index grating. When the incident laser passes through the refractive index grating at the Bragg angle, diffraction occurs.

[0030] The first reflective surface 34 is disposed adjacent to the second mounting surface 32, and the second reflective surface 35 is disposed adjacent to the first mounting surface 31. That is, the first reflective surface 34 connects the second mounting surface 32 and the two light-transmitting surfaces 33, and the second reflective surface 35 connects the first mounting surface 31 and the two light-transmitting surfaces 33. The first reflective surface 34 is disposed opposite the first mounting surface 31, and the second reflective surface 35 is disposed opposite the second mounting surface 32. An angle is formed between the first reflective surface 34 and the second mounting surface 32, and between the second reflective surface 35 and the first mounting surface 31, to prevent ultrasonic waves from being reflected by the first and second reflective surfaces 34 and 35 and then returning along their original path. When the ultrasonic wave generated by the first transducer 4 enters the acousto-optic medium 3, it is initially reflected by the first reflective surface 34. When the ultrasonic wave generated by the second transducer 5 enters the acousto-optic medium 3, it is initially reflected by the second reflective surface 35.

[0031] Inclined surface 36 connects first reflective surface 34, second reflective surface 35, and two light-transmitting surfaces 33. That is, inclined surface 36 is not adjacent to first assembly surface 31 or second assembly surface 32. First reflective surface 34, second reflective surface 35, and inclined surface 36 are all rough surfaces. When the ultrasonic waves generated by first transducer 4 and second transducer 5 are reflected by first reflective surface 34 and second reflective surface 35, they are scattered by the rough surfaces, thereby absorbing the ultrasonic waves. Ultrasonic waves not scattered by first reflective surface 34 and second reflective surface 35 are further transmitted to inclined surface 36, which further scatters most of the ultrasonic waves.

[0032] An angle is formed between the inclined surface 36 and the light-transmitting surface 33, and the inclined surface 36 and the light-transmitting surface 33 are not perpendicular. In this embodiment, the inclined surface 36 is perpendicular to the second mounting surface 32 and is deflected about the intersection line of the first mounting surface 31 and the light-transmitting surface 33, thereby creating an angle between the inclined surface 36 and the light-transmitting surface 33. Due to the angle between the inclined surface 36 and the light-transmitting surface 33, the propagation angle of the ultrasonic wave reflected by the inclined surface 36 is no longer parallel to the light-transmitting surface 33, making it more difficult for the ultrasonic wave to pass through the incident light area. Even if the incident light passes through the incident light area, the incident light no longer enters the refractive index grating formed by the ultrasonic wave reflected by the inclined surface 36 at the Bragg angle, and the incident light is not diffracted.

[0033] The matching circuit 6 of the two-dimensional acousto-optic device sends signals to the first transducer 4 mounted on the first mounting surface 31 of the acousto-optic medium 3 and the second transducer 5 mounted on the second mounting surface 32. When the ultrasonic waves generated by the first transducer 4 and the second transducer 5 are transmitted in the acousto-optic medium 3, the ultrasonic waves are first reflected on the first reflecting surface 34 and the second reflecting surface respectively. Since the first reflecting surface 34 and the second reflecting surface 35 of the acousto-optic medium 3 are both rough surfaces, the first reflecting surface 34 and the second reflecting surface 35 will scatter a part of the sound waves, and then the remaining sound waves will continue to reflect on the inclined surface 36. The inclined surface 36 is also a rough surface, which will further scatter most of the sound waves. sound waves; in addition, since there is an angle between the inclined surface 36 and the light-passing surface 33 and they are not perpendicular, the sound waves reflected by the inclined surface 36 will not be parallel to the light-passing surface 33, and the reflected sound waves are difficult to pass through the area of ​​the incident light, and will not change the refractive index of the acousto-optic medium 3 in the area where the incident light passes. Even if a small amount of sound waves pass through the area of ​​the incident light, since the sound waves at this time are not parallel to the light-passing surface 33, the incident light will not enter the refractive index grating formed by the reflected sound waves at the Bragg angle. Therefore, the reflected sound waves will not cause multiple diffraction of the incident light, nor will the opening time of the acousto-optic device be increased due to the reflected sound waves, thereby ensuring that the laser can generate high-repetition-rate pulsed lasers.

[0034] Preferably, the included angle between the inclined surface 36 and the light-transmitting surface 33 is defined as α, α≥90+10θ, where θ is the Bragg angle.

[0035] Theoretically, the angle α between the inclined surface 36 and the light-transmitting surface 33 should be as large as possible to minimize the impact of ultrasonic waves reflected from the inclined surface 36 on the incident light region. According to the application of the Bragg formula in acousto-optic devices, the Bragg angle θ satisfies ndSinθ = λ / 2, where λ is the wavelength of the incident light, n is the refractive index of the acousto-optic medium 3, and d is the ultrasonic wave length. Typically, the Bragg angle θ is relatively small. For example, for fused silica with an acoustic frequency of 40.68 MHz and an optical wavelength of 1064 nm, θ is only 0.14°. In this embodiment, α ≥ 90 + 10θ. The angle α can be maximized to avoid multiple diffraction of light and prevent the device from having a prolonged on-time when used as a Q-switch.

[0036] Preferably, the dimension of the second assembly surface 32 in a direction perpendicular to the first assembly surface 31 is defined as h, and the distance between the center point of the inclined surface 36 and the first assembly surface 31 is defined as L, where L≥2h.

[0037] Theoretically, the greater the distance L between the center point of the inclined surface 36 and the first mounting surface 31, the better. This is because as the distance increases, the intensity of the sound wave gradually decreases in the crystal, which helps to reduce the impact of the reflected sound wave on the incident light. In this embodiment, L is a minimum of 2h to avoid waste caused by excessive distance.

[0038] Preferably, the included angle between the first assembly surface 31 and the second reflective surface 35 is β, the included angle between the second assembly surface 32 and the first reflective surface 34 is γ, and 120°≤β≤150°, 120°≤γ≤150°.

[0039] The ranges of β and γ are both between 120° and 150°, which can reflect most of the ultrasonic waves to other directions instead of returning to the first assembly surface 31 and the second assembly surface 32 , thereby preventing the reflected ultrasonic waves from passing through the area of ​​the incident light.

[0040] Preferably, the first reflecting surface 34 and the second reflecting surface 35 are parallel to each other.

[0041] The first reflecting surface 34 and the second reflecting surface 35 are parallel to each other, which can facilitate the processing of the acousto-optic medium 3. In other embodiments, the first reflecting surface 34 and the second reflecting surface 35 may also be non-parallel.

[0042] Preferably, the roughness of the rough surface is Ra, and Ra>0.1.

[0043] The roughness of the rough surface is greater than 0.1, which can effectively scatter ultrasonic waves.

[0044] Preferably, the two-dimensional acousto-optic device further includes a first heat sink 9, a second heat sink 10, a first bonding plate 11 and a second bonding plate 12, the first heat sink 9 contacts the second reflecting surface 35, the second heat sink 10 contacts the first reflecting surface 34, the first bonding plate 11 is fixedly assembled on the first heat sink 9, the second bonding plate 12 is fixedly assembled on the second heat sink 10, the first bonding plate 11 and the first transducer 4, and the second bonding plate 12 and the second transducer 5 are electrically connected respectively through gold wires 13, and the first bonding plate 11 and the second bonding plate 12 are electrically connected to the matching circuit 6 respectively through wires 14.

[0045] The heat generated by the ultrasonic wave propagating in the acousto-optic medium 3 will be absorbed by the first heat dissipation block 9 and the second heat dissipation block 10 , which can effectively reduce the heat of the acousto-optic medium 3 .

[0046] A first bonding plate 11 is provided on the first heat sink 9, and a second bonding plate 12 is provided on the second heat sink 10. Gold wires 13 are used to connect the first bonding plate 11 to the first transducer 4, and the second bonding plate 12 to the second transducer 5, respectively. This prevents the first bonding plate 11 and the second bonding plate 12 from being directly fixed to the acousto-optic medium 3. Conventional bonding plates are bonded to the acousto-optic medium 3 using glue, but this bonding process is unstable and can easily cause the bonding plates to fall off the acousto-optic medium 3.

[0047] The first bonding plate 11 is separated from the first transducer 4, and the second bonding plate 12 is separated from the second transducer 5. When the electrodes on the first transducer 4 and the second transducer 5 have problems and need to be repaired, the presence of the first bonding plate 11 and the second bonding plate 12 can avoid affecting the electrode processing. At the same time, the diameter of the gold wire 13 is smaller than that of the wire 14, which has little impact on the electrodes on the first transducer 4 and the second transducer 5 during welding, making welding easier.

[0048] Preferably, the bracket 1 also has a receiving groove 15, which is arranged at a position opposite to the first transducer 4, the second transducer 5, the first bonding plate 11, and the second bonding plate 12, and the first transducer 4, the second transducer 5, the first bonding plate 11, and the second bonding plate 12 are embedded in the receiving groove 15.

[0049] An accommodating groove 15 is provided on the bracket 1 , which provides assembly space for the first transducer 4 , the second transducer 5 , the first bonding board 11 , and the second bonding board 12 , and also facilitates assembly of the gold wire 13 .

[0050] Preferably, the two-dimensional acousto-optic device further includes a water cooling joint 16, which is fixedly mounted on the side of the housing 2 facing away from the assembly cavity 7. Water cooling channels are respectively provided in the first heat dissipation block 9 and the second heat dissipation block 10, and the water cooling joint 16 is connected to the water cooling channels.

[0051] Water cooling channels are provided in the first heat dissipation block 9 and the second heat dissipation block 10 . The water cooling joint 16 can be connected to an external water cooling box, thereby realizing a water flow path to dissipate heat for the acousto-optic medium 3 .

[0052] In some embodiments, a temperature control joint 17 may be further provided on the housing 2 , and a temperature control switch may be added to the first heat sink 9 . The temperature control switch is connected to the temperature control joint 17 to monitor the temperature of the acousto-optic device in real time.

[0053] In summary, an embodiment of the present invention provides a two-dimensional acousto-optic device, wherein a matching circuit sends signals to a first transducer mounted on a first mounting surface of an acousto-optic medium and a second transducer mounted on a second mounting surface. When the ultrasonic waves generated by the first transducer and the second transducer are transmitted in the acousto-optic medium, the ultrasonic waves are first reflected on the first reflecting surface and the second reflecting surface, respectively. Since the first reflecting surface and the second reflecting surface of the acousto-optic medium are both rough surfaces, the first reflecting surface and the second reflecting surface will scatter a portion of the sound waves, and then the remaining sound waves will continue to reflect onto the inclined surface, which is also a rough surface, further scattering most of the sound waves. wave; in addition, since there is an angle between the inclined surface and the light-passing surface and they are not perpendicular, the sound waves reflected by the inclined surface will not be parallel to the light-passing surface, and the reflected sound waves are unlikely to pass through the area of ​​the incident light, and will not change the refractive index of the acousto-optic medium in the area where the incident light passes. Even if a small amount of sound waves pass through the area of ​​the incident light, since the sound waves at this time are not parallel to the light-passing surface, the incident light will not enter the refractive index grating formed by the reflected sound waves at the Bragg angle. Therefore, the reflected sound waves will not cause multiple diffraction of the incident light, nor will the reflected sound waves increase the opening time of the acousto-optic device, thereby ensuring that the laser can generate high-repetition-rate pulsed lasers.

[0054] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A two-dimensional acousto-optic device, characterized in that: The two-dimensional acousto-optic device comprises a bracket (1) and a housing (2) fixedly connected to the bracket (1), wherein the housing (2) and the bracket (1) enclose an assembly cavity (7), and the two-dimensional acousto-optic device further comprises an acousto-optic medium (3), a first transducer (4), a second transducer (5), and a matching circuit (6) arranged in the assembly cavity (7); The acousto-optic medium (3) has a first assembly surface (31), a second assembly surface (32), a light-transmitting surface (33), a first reflection surface (34), a second reflection surface (35) and an inclined surface (36); the first assembly surface (31) and the second assembly surface (32) are adjacently arranged and perpendicular to each other; the light-transmitting surface (33) is perpendicular to the first assembly surface (31) and the second assembly surface (32) respectively; there are two light-transmitting surfaces (33) and they are parallel to each other; the first reflection surface (34) and the second assembly surface (32) are adjacently arranged; the second reflection surface (35) and the first assembly surface (31) are adjacently arranged; the inclined surface (36) connects the first reflection surface (34), the second reflection surface (35) and the light-transmitting surface (33); the first reflection surface (34), the second reflection surface (35) and the inclined surface (36) are all rough surfaces; the inclined surface (36) and the light-transmitting surface (33) have an angle and are not perpendicular; The first transducer (4) is mounted on the first mounting surface (31), the second transducer (5) is mounted on the second mounting surface (32), and the first transducer (4) and the second transducer (5) are both electrically connected to the matching circuit (6); The first reflecting surface (34) is arranged opposite to the first assembly surface (31), and the second reflecting surface (35) is arranged opposite to the second assembly surface (32). The included angle between the first assembly surface (31) and the second reflecting surface (35) is β, and the included angle between the second assembly surface (32) and the first reflecting surface (34) is γ, and 120°≤β≤150°, and 120°≤γ≤150°.

2. The two-dimensional acousto-optic device according to claim 1, characterized in that The angle between the inclined surface (36) and the light-transmitting surface (33) is defined as α, α≥90+10θ, where θ is the Bragg angle.

3. The two-dimensional acousto-optic device according to claim 1, characterized in that The dimension of the second assembly surface (32) in a direction perpendicular to the first assembly surface (31) is defined as h, and the distance between the center point of the inclined surface (36) and the first assembly surface (31) is defined as L, where L≥2h.

4. The two-dimensional acousto-optic device according to claim 1, wherein The first reflecting surface (34) and the second reflecting surface (35) are parallel to each other.

5. The two-dimensional acousto-optic device according to claim 1, characterized in that The roughness of the rough surface is Ra, and Ra>0.

1.

6. The two-dimensional acousto-optic device according to any one of claims 1 to 5, characterized in that: The two-dimensional acousto-optic device further includes a first heat sink (9), a second heat sink (10), a first bonding plate (11), and a second bonding plate (12); the first heat sink (9) contacts the second reflection surface (35), the second heat sink (10) contacts the first reflection surface (34), the first bonding plate (11) is fixedly assembled on the first heat sink (9), the second bonding plate (12) is fixedly assembled on the second heat sink (10), the first bonding plate (11) and the first transducer (4), and the second bonding plate (12) and the second transducer (5) are electrically connected via gold wires (13), and the first bonding plate (11) and the second bonding plate (12) are electrically connected to the matching circuit (6) via wires (14).

7. The two-dimensional acousto-optic device according to claim 6, characterized in that The bracket (1) further comprises a receiving groove (15), wherein the receiving groove (15) is arranged at a position opposite to the first transducer (4), the second transducer (5), the first bonding plate (11), and the second bonding plate (12), and the first transducer (4), the second transducer (5), the first bonding plate (11), and the second bonding plate (12) are embedded in the receiving groove (15).

8. The two-dimensional acousto-optic device according to claim 6, characterized in that The two-dimensional acousto-optic device further includes a water-cooling joint (16), which is fixedly mounted on a side of the housing (2) facing away from the assembly cavity (7), and the first heat dissipation block (9) and the second heat dissipation block (10) are respectively provided with water-cooling channels, and the water-cooling joint (16) is connected to the water-cooling channels.

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