Two-dimensional acousto-optic device

Abstract

The invention relates to the technical field of photoelectrons, and discloses a two-dimensional acousto-optic device which comprises a support, a shell, an acousto-optic medium, a first transducer, a second transducer and a matching circuit. The acousto-optic medium is provided with a first assembling surface, a second assembling surface, a light passing surface, a first reflecting surface, a second reflecting surface and an inclined surface, the first assembling surface is adjacent and vertical to the second assembling surface, the light passing surface is respectively vertical to the first assembling surface and the second assembling surface, and the first reflecting surface, the second reflecting surface and the inclined surface are all rough surfaces; the inclined surface and the light-passing surface form an included angle and are not vertical; the first transducer is assembled on the first assembling face, and the second transducer is assembled on the second assembling face. The first reflecting surface, the second reflecting surface and the inclined surface are used as rough surfaces to scatter most sound waves, the inclined surface and the light passing surface form an included angle and are not vertical, so that the sound waves reflected by the inclined surface are difficult to pass through an area of incident light, the incident light cannot enter a refractive index grating formed by the reflected sound waves at a Bragg angle, and multiple diffraction cannot be caused.

Description

Technical Field

[0001] The 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 in the laser cavity. It has been widely used in laser marking machines, laser cutting machines and other fields. It can quickly Q-switch continuous lasers into high-power pulsed lasers of the required frequency. The working principle of the acousto-optic Q switch is the acousto-optic effect. When ultrasound passes through the crystal, it changes the optical properties of the crystal, causing its refractive index to change, forming a distribution that changes with the intensity of the ultrasound. The entire crystal is equivalent to a refractive index grating, which diffracts the incident laser.

[0003] The existing two-dimensional acousto-optic Q switch uses two mutually perpendicular transducers to generate ultrasonic waves respectively, change the refractive index of the acousto-optic medium, Q-switched the laser, and uses the sound-absorbing surface to process the ultrasonic waves. When the ultrasonic wave is transmitted in the acousto-optic medium, the sound wave reflected by the acousto-optic medium will reach the working area through which the laser passes, causing the incident light to be diffracted by multiple layers, that is, the reflected sound wave causes the incident light to be diffracted twice, and finally multiple diffractions occur. In addition, since the sound wave reflects back and forth for a distance in the acousto-optic medium before reaching the position of the incident light to diffract it, which takes about a few microseconds, when the transducer stops working, the incident light will be diffracted for a few more microseconds, which increases the opening time of the acousto-optic device when used as a Q switch. When the acousto-optic device is used in the laser cavity for Q-switching, the increased opening time slows down the laser light emission speed, making it impossible for the laser to generate high-repetition-rate pulsed lasers. 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 causes the laser to be diffracted multiple times after multiple reflections in the acousto-optic medium, thereby reducing the device response time and improving the overall performance of the device.

[0005] In order to achieve the above-mentioned object, the present invention provides a two-dimensional acousto-optic device, comprising a bracket and a shell fixedly connected to the bracket, wherein the shell and the bracket are enclosed to form an assembly cavity, and the two-dimensional acousto-optic device also comprises an acousto-optic medium, a first transducer, a second transducer and a matching circuit arranged 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 respectively perpendicular to the first mounting surface and the second mounting surface, 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 has 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, wherein θ is the Bragg angle.

[0009] Preferably, a dimension of the second assembly surface in a direction perpendicular to the first assembly surface is defined as h, and a distance between a 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, 120°≤β≤150°, 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 comprises a first heat sink, a second heat sink, a first wire bonding board and a second wire bonding board, the first heat sink is in contact with the second reflecting surface, the second heat sink is in contact with the first reflecting surface, the first wire bonding board is fixedly assembled on the first heat sink, the second wire bonding board is fixedly assembled on the second heat sink, the first wire bonding board and the first transducer are electrically connected as well as the second wire bonding board and the second transducer are electrically connected respectively through gold wires, and the first wire bonding board and the second wire bonding board are electrically connected to the matching circuit respectively through 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 bonding board, and the second bonding board, and the first transducer, the second transducer, the first bonding board, and the second bonding board are embedded in the receiving groove.

[0015] Preferably, the two-dimensional acousto-optic device further comprises a water cooling joint, which is fixedly mounted on a side of the housing away from the mounting cavity, and 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 beneficial effects: 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 transducer and the second transducer are transmitted in the acousto-optic medium, the ultrasonic waves are first reflected on the first reflection surface and the second reflection surface respectively. Since the first reflection surface and the second reflection surface of the acousto-optic medium are both rough surfaces, the first reflection surface and the second reflection surface will scatter a part of the sound waves, and then the remaining sound waves will continue to be reflected on the inclined surface, which is also a rough surface, and will further scatter the sound waves. Most of the sound waves are eliminated; in addition, since there is an angle between the inclined surface and the light-transmitting surface and they are not perpendicular, the sound waves reflected by the inclined surface will not be parallel to the light-transmitting surface, and the reflected sound waves will have difficulty passing 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-transmitting 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, and the opening time of the acousto-optic device will not be increased due to the reflected sound waves, 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 of 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 specific implementation of the present invention is further described in detail below in conjunction with 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, and the bracket 1 and the housing 2 are fixedly connected. The bracket 1 is an L-shaped structure, and the housing 2 and the bracket 1 are enclosed to form an assembly cavity 7, and the acousto-optic medium 3, the first transducer 4, the second transducer 5 and the matching circuit 6 are all arranged in the assembly cavity 7, and the bracket 1 and the housing 2 form protection for the components therein. The housing is also provided with a light through hole 21, and there are two light through holes 21 and they are coaxially arranged to allow incident light to pass through.

[0026] The acousto-optic medium 3 is used for transmitting ultrasonic waves and incident light, the first transducer 4 and the second transducer 5 are used for generating ultrasonic waves, the acousto-optic medium 3, the first transducer 4 and the second transducer 5 are fixedly connected and then fixedly connected to the bracket 1, the matching circuit 6 is fixedly connected to the housing 2, and the matching circuit 6 is electrically connected to the first transducer 4 and the second transducer 5 respectively to control the first transducer 4 and the second transducer 5 to generate ultrasonic waves, and when ultrasonic waves are transmitted in the crystal, the optical properties of the crystal will be changed to change the refractive index of the crystal, forming a refractive index grating, and the incident light is incident into the acousto-optic medium 3 at a Bragg angle and diffracts when passing through the refractive index grating. In this embodiment, a radio frequency connector 8 is also provided on the housing 2, and the radio frequency connector 8 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 is selected as required, and may be fused quartz, lithium niobate, etc. 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, that is, the two light-transmitting surfaces 33 are two mutually parallel outer surfaces of the acousto-optic medium 3. The light-transmitting surfaces 33 are perpendicular to the first assembly surface 31 and the second assembly surface 32 and are adjacently arranged. In this embodiment, the first assembly surface 31, the second assembly surface 32, and the light-transmitting surface 33 are polished to ensure their smooth surfaces.

[0028] The first transducer 4 is fixedly mounted on the first assembly surface 31, and the second transducer 5 is fixedly mounted on the second assembly surface 32. The first transducer 4 is arranged in close contact with the first assembly surface 31. The first transducer 4 is used to generate ultrasonic waves and transmit the ultrasonic waves into the acousto-optic medium 3 via the first assembly surface 31. The second transducer 5 is used to generate ultrasonic waves and transmit the ultrasonic waves into the acousto-optic medium 3 via the second assembly surface 32. Since the first assembly surface 31 and the second assembly 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 assembly surface 31 and the second assembly surface 32, and when the incident light meets the Bragg angle, diffraction can occur in 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 will occur.

[0030] The first reflecting surface 34 is arranged adjacent to the second assembly surface 32, and the second reflecting surface 35 is arranged adjacent to the first assembly surface 31, that is, the first reflecting surface 34 connects the second assembly surface 32 and the two light-transmitting surfaces 33, and the second reflecting surface 35 connects the first assembly surface 31 and the two light-transmitting surfaces 33. 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. There is an angle between the first reflecting surface 34 and the second assembly surface 32, and between the second reflecting surface 35 and the first assembly surface 31, so as to prevent the ultrasonic wave from being reflected by the first reflecting surface 34 and the second reflecting surface 35 and returning along the original path. When the ultrasonic wave generated by the first transducer 4 enters the acousto-optic medium 3, the first reflection is generated on the first reflecting surface 34, and when the ultrasonic wave generated by the second transducer 5 enters the acousto-optic medium 3, the first reflection is generated on the second reflecting surface 35.

[0031] The inclined surface 36 connects the first reflecting surface 34, the second reflecting surface 35 and the two light-transmitting surfaces 33, that is, the inclined surface 36 is not adjacent to the first assembly surface 31 and the second assembly surface 32. The first reflecting surface 34, the second reflecting surface 35 and the inclined surface 36 are all rough surfaces. When the ultrasonic waves generated by the first transducer 4 and the second transducer 5 are reflected by the first reflecting surface 34 and the second reflecting surface 35, the ultrasonic waves will be scattered on the rough surfaces, playing a role of absorbing the ultrasonic waves; the ultrasonic waves not scattered by the first reflecting surface 34 and the second reflecting surface 35 continue to be transmitted to the inclined surface 36, and the inclined surface 36 can further scatter most of the ultrasonic waves.

[0032] There is an angle 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 the inclined surface 36 deflects with the intersection line of the first mounting surface 31 and the light-transmitting surface 33 as the axis, so that an angle is generated 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 transmission angle of the ultrasonic wave reflected by the inclined surface 36 is no longer parallel to the light-transmitting surface 33, and it is more difficult to pass through the incident light area. Even if it 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 will not be 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 reflection surface 34 and the second reflection surface 35 respectively. Since the first reflection surface 34 and the second reflection surface 35 of the acousto-optic medium 3 are both rough surfaces, the first reflection surface 34 and the second reflection surface 35 will scatter a part of the sound waves, and then the remaining sound waves will continue to be reflected on the inclined surface 36, and 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, and the opening time of the acousto-optic device will not 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, wherein 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 reduce the influence of the ultrasonic wave reflected by the inclined surface 36 on the incident light area. According to the application of the Bragg formula in the acousto-optic device, 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. Normally, the Bragg angle θ is relatively small. For example, for fused quartz with an acoustic frequency of 40.68MHz and an optical wavelength of 1064nm, θ is only 0.14°. In this embodiment, α≥90+10θ, and the angle α can be increased as much as possible, thereby avoiding multiple diffraction of light and preventing the device from being turned on for a longer 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 distance L between the center point of the inclined surface 36 and the first assembly surface 31 is as far as possible, because as the distance increases, the intensity of the sound wave gradually decays in the crystal, which is more conducive to reducing the impact of the reflected sound wave on the incident light. In this embodiment, L is at least 2h, which can avoid waste caused by too large a distance.

[0038] Preferably, the included angle between the first assembly surface 31 and the second reflection surface 35 is β, the included angle between the second assembly surface 32 and the first reflection 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 reflection surface 34 and the second reflection surface 35 are parallel to each other, which can facilitate the processing of the acousto-optic medium 3. In other embodiments, the first reflection surface 34 and the second reflection surface 35 may not be parallel to each other.

[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 scatter ultrasonic waves well.

[0044] Preferably, the two-dimensional acousto-optic device also 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, 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 sink block 9 and the second heat sink block 10 , which can effectively reduce the heat of the acousto-optic medium 3 .

[0046] A first bonding board 11 is arranged on the first heat sink 9, and a second bonding board 12 is arranged on the second heat sink 10, and the first bonding board 11 and the first transducer 4, and the second bonding board 12 and the second transducer 5 are connected by gold wires 13, so as to avoid directly fixing the first bonding board 11 and the second bonding board 12 on the acousto-optic medium 3. The existing bonding board and the acousto-optic medium 3 are bonded by glue, and the bonding process may be unreliable, and the bonding board is easy to fall off from the acousto-optic medium 3.

[0047] The first bonding board 11 is arranged separately from the first transducer 4, and the second bonding board 12 is arranged separately 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 first bonding board 11 and the second bonding board 12 can be prevented from affecting the electrode processing. At the same time, the diameter of the gold wire 13 is smaller than that of the wire 14, so the electrodes on the first transducer 4 and the second transducer 5 are less affected during welding, which facilitates welding.

[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 board 11, and the second bonding board 12, and the first transducer 4, the second transducer 5, the first bonding board 11, and the second bonding board 12 are embedded in the receiving groove 15.

[0049] The bracket 1 is provided with a receiving groove 15 , which provides an assembly space for the first transducer 4 , the second transducer 5 , the first bonding board 11 , and the second bonding board 12 , and is also convenient for assembling 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 away from the mounting cavity 7, and the first heat sink 9 and the second heat sink 10 are respectively provided with water cooling channels, and the water cooling joint 16 is connected to the water cooling channels.

[0051] Water cooling channels are provided in the first heat sink block 9 and the second heat sink 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, and the temperature control switch may be connected to the temperature control joint 17 to monitor the temperature of the acousto-optic device in real time.

[0053] In summary, the embodiment of the present invention provides a two-dimensional acousto-optic device, wherein 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 transducer and the second transducer are transmitted in the acousto-optic medium, the ultrasonic waves are first reflected on the first reflection surface and the second reflection surface respectively. Since the first reflection surface and the second reflection surface of the acousto-optic medium are both rough surfaces, the first reflection surface and the second reflection surface will scatter a part of the sound waves, and then the remaining sound waves will continue to be reflected on the inclined surface, and the inclined surface is also a rough surface, which will further scatter 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 wave reflected by the inclined surface will not be parallel to the light-passing surface, and the reflected sound wave is difficult 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 wave at the Bragg angle. Therefore, the reflected sound wave will not cause multiple diffraction of the incident light, and the opening time of the acousto-optic device will not be increased due to the reflected sound wave, 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 support (1) and a housing (2) fixedly connected to the support (1), wherein the housing (2) and the support (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) comprises 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 respectively perpendicular to the first assembly surface (31) and the second assembly surface (32); 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).

2. The two-dimensional acousto-optic device according to claim 1, characterized in that: The included angle between the inclined surface (36) and the light-transmitting surface (33) is defined as α, α≥90+10θ, wherein 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, characterized in that: The included angle between the first assembly surface (31) and the second reflection surface (35) is β, the included angle between the second assembly surface (32) and the first reflection surface (34) is γ, and 120°≤β≤150°, and 120°≤γ≤150°.

5. The two-dimensional acousto-optic device according to claim 4, characterized in that: The first reflecting surface (34) and the second reflecting surface (35) are parallel to each other.

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

1.

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

8. The two-dimensional acousto-optic device according to claim 7, 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 board (11), and the second bonding board (12); the first transducer (4), the second transducer (5), the first bonding board (11), and the second bonding board (12) are embedded in the receiving groove (15).

9. The two-dimensional acousto-optic device according to claim 7, characterized in that: The two-dimensional acousto-optic device further comprises a water cooling joint (16), wherein the water cooling joint (16) is fixedly mounted on a side of the housing (2) facing away from the mounting cavity (7), and the first heat sink (9) and the second heat sink (10) are respectively provided with water cooling channels, and the water cooling joint (16) is in communication with the water cooling channels.

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