Acousto-optic frequency shifting system

Abstract

The application discloses an acousto-optic frequency shift system, comprising a laser light source, an acousto-optic frequency shifter, a laser receiving component and at least two return mirror devices, wherein the laser light source is used for emitting a light beam; the acousto-optic frequency shifter is used for receiving the light beam emitted by the laser light source and performing frequency shift processing; the laser receiving component is used for receiving the light beam emitted by the acousto-optic frequency shifter after the last frequency shift processing; one of the two reflecting mirrors in each return mirror device receives the frequency-shifted light beam emitted by the acousto-optic frequency shifter, and the other reflecting mirror reflects the frequency-shifted light beam back to the acousto-optic frequency shifter. The application sets multiple return mirror devices, reduces the production cost of the acousto-optic frequency shift system, enables the acousto-optic frequency shift system to realize multiple precise adjustments of the laser frequency based on one acousto-optic frequency shifter, further greatly adjusts the laser frequency, and expands the frequency adjustment range of the acousto-optic frequency shift system.

Description

Technical Field

[0001] This invention relates to the field of optical path system technology for ion trap quantum computers, and in particular to an acousto-optic frequency shifting system. Background Technology

[0002] In ion trap quantum computing devices, it is often necessary to adjust the frequency of the laser. For example, laser atom cooling has extremely strict requirements on the center frequency of a single-frequency laser. Therefore, in practical applications, the center frequency of the single-frequency laser is precisely adjusted.

[0003] In existing technologies, AOM (acousto-optic frequency shifter) is usually used to adjust the laser frequency. When the frequency adjustment range is large, the dual-path optical path scheme based on the acousto-optic frequency shifter can achieve a 2x frequency adjustment. However, in some cases, even a 2x frequency adjustment cannot meet the application requirements. Currently, a custom acousto-optic frequency shifter with a higher frequency adjustment range is usually used, but this solution will significantly increase the cost. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of this invention is to provide an acousto-optic frequency shifting system that performs multiple frequency adjustments on a laser based on a single AOM (Acousto-Optical Oscillator), thereby reducing the production cost of the acousto-optic frequency shifting system.

[0005] According to an embodiment of the present invention, an acousto-optic frequency shifting system includes: a laser source, an acousto-optic frequency shifter, a laser receiving component, and at least two retroreflector devices. The laser source is used to emit a light beam; the acousto-optic frequency shifter is used to receive the light beam emitted by the laser source and perform frequency shifting processing; the laser receiving component is used to receive the light beam emitted after the last frequency shifting processing by the acousto-optic frequency shifter; the retroreflector device includes a support, a light-shielding component, and two reflective components. The light-shielding component is disposed on the support and includes a light-shielding plate. The light-shielding plate has a light-transmitting portion for transmitting first-order diffracted light while blocking transmitted light and other diffracted light. The two reflective components are disposed on the support and are symmetrical about the light-shielding plate. Each reflective component includes a reflector, and the reflector is tilted relative to the light-shielding plate. In each retroreflector device, one of the two reflectors receives the frequency-shifted light beam emitted by the acousto-optic frequency shifter, and the other reflects the frequency-shifted light beam back to the acousto-optic frequency shifter.

[0006] According to the embodiments of the present invention, the acousto-optic frequency shifting system reduces the production cost of the acousto-optic frequency shifting system by setting multiple return mirror devices, enabling the acousto-optic frequency shifting system to achieve multiple precise adjustments of the laser frequency based on a single acousto-optic frequency shifter, thereby significantly adjusting the laser frequency and expanding the frequency adjustment range of the acousto-optic frequency shifting system.

[0007] In some embodiments of the present invention, at least two of the return mirror devices are disposed on opposite sides of the acousto-optic frequency shifter.

[0008] In some embodiments of the present invention, the retroreflector device on one side of the acousto-optic frequency shifter is disposed on the same side as the laser source and the laser receiving component.

[0009] In some embodiments of the present invention, there are at least two return mirror devices on the other side of the acousto-optic frequency shifter.

[0010] In some embodiments of the present invention, the light-shielding component and the two reflection components in the return mirror device on one side of the acousto-optic frequency shifter are arranged in a horizontal direction, while the light-shielding component and the two reflection components in the return mirror device on the other side of the acousto-optic frequency shifter are arranged in a vertical direction.

[0011] In some embodiments of the present invention, the acousto-optic frequency shifting system further includes a light-blocking component disposed between the acousto-optic frequency shifter and the laser receiving component, so that the target frequency-shifting beam is directed toward the laser receiving component.

[0012] In some embodiments of the present invention, the light-shielding component includes a first mounting base and a first adjustment component. The first mounting base is disposed on the bracket, and the first adjustment component and the light-shielding plate are disposed on the first mounting base. The first adjustment component moves in conjunction with the two reflective components to synchronously adjust the distance between the two reflective mirrors and the light-shielding plate.

[0013] In some embodiments of the present invention, the reflective assembly includes a second mounting base movably disposed on the bracket, and the reflector is disposed on the second mounting base; the first adjustment assembly includes a first adjustment rod, the first adjustment rod being pivotally disposed on the first mounting base, and the two ends of the first adjustment rod being screwed to the second mounting bases of the two reflective assemblies respectively.

[0014] In some embodiments of the present invention, the reflective assembly includes a second adjustment assembly connected to the reflector to cause the reflector to oscillate about a first pivot axis to adjust the tilt angle of the reflector relative to the light-shielding plate.

[0015] In some embodiments of the present invention, the reflective assembly includes a third adjustment assembly disposed between the second adjustment assembly and the reflector, such that the reflector swings about a second pivot axis, the second pivot axis being perpendicular to the first pivot axis.

[0016] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0018] Figure 1 This is a schematic diagram of the acousto-optic frequency shifting system according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the retroreflector device of the acousto-optic frequency shifting system according to an embodiment of the present invention;

[0020] Figure 3 This is a rear view of the retroreflector device of the acousto-optic frequency shifting system according to an embodiment of the present invention;

[0021] Figure 4 This is a cross-sectional view of the second adjusting rod of the retroreflector device according to an embodiment of the present invention.

[0022] Figure label:

[0023] 1000. Acoustic-optical frequency shifting system;

[0024] 100. Retrograde mirror device;

[0025] 10. Bracket;

[0026] 20. Light-shielding components;

[0027] 21. Light-shielding plate; 21a. Light-transmitting part;

[0028] 22. First mounting base;

[0029] 23. First adjusting component; 231. First adjusting rod;

[0030] 30. Reflective components;

[0031] 31. Reflector;

[0032] 32. Second adjusting assembly; 321. Second mounting base; 322. Third mounting base; 323. Gear; 324. Rack; 325. Pivot shaft;

[0033] 33. Third adjusting component; 331. Bolt; 332. Elastic element;

[0034] 200. Acousto-optic frequency shifter; 300. Laser source; 400. Laser receiving component; 500. Light blocking component. Detailed Implementation

[0035] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] The following is for reference. Figures 1-4 A sound-optic frequency shifting system 1000 according to an embodiment of the present invention is described.

[0037] like Figure 1 , Figure 2 As shown, the acousto-optic frequency shifting system 1000 according to an embodiment of the present invention includes: a laser source 300, an acousto-optic frequency shifter 200, a laser receiving component 400, and at least two retroreflector devices 100.

[0038] A laser source 300 is used to emit a beam. An acousto-optic frequency shifter 200 is used to receive the beam emitted by the laser source 300 and perform frequency shifting processing. A laser receiving component 400 is used to receive the beam emitted after the last frequency shifting processing by the acousto-optic frequency shifter 200. The retroreflector device 100 includes a support 10, a light-shielding assembly 20, and two reflective components 30. The light-shielding assembly 20 is mounted on the support 10 and includes a light-shielding plate 21. The light-shielding plate 21 has a light-transmitting part 21a for transmitting first-order diffracted light while blocking transmitted light and other diffracted light. The two reflective components 30 are mounted on the support 10 and are symmetrical about the light-shielding plate 21. Each reflective component 30 includes a reflector 31, which is tilted relative to the light-shielding plate 21. In each retroreflector device 100, one of the two reflectors 31 receives the frequency-shifted beam emitted by the acousto-optic frequency shifter 200, and the other reflects the frequency-shifted beam back to the acousto-optic frequency shifter 200.

[0039] Specifically, combined Figure 2 The working principle of the retroreflector device 100 is explained as follows: When the retroreflector device 100 is working, the first-order diffracted light after the first acousto-optic frequency shifter 200 is directed to the lower reflector component 30. The lower reflector component 30 reflects the first-order diffracted light to the light-shielding component 20. The first-order diffracted light passes through the light-transmitting part 21a and is directed to the upper reflector component 30. Then, the upper reflector component 30 reflects the first-order diffracted light back to the acousto-optic frequency shifter 200, forming a secondary reflection. The first-order diffracted light undergoes a secondary acousto-optic frequency shifter 200. That is, based on the dual optical path of the acousto-optic frequency shifter 200, the laser is reflected back to the acousto-optic frequency shifter 200 through the retroreflector device 100 to achieve a frequency adjustment of twice the laser frequency.

[0040] In other words, the laser that undergoes one acousto-optic frequency shift by the acousto-optic frequency shifter 200 will generate multiple diffracted lights with different frequencies, i.e., multi-order diffracted lights. Among them, the transmitted light with the same frequency as the original laser is the zero-order diffracted light, and the first-order diffracted light has the highest power among the diffracted lights with changed frequency. By setting the light-shielding component 20, the first-order diffracted light is allowed to pass through the light-transmitting part 21a, while the transmitted light and other diffracted lights are blocked by the light-shielding component 20, thereby achieving the screening of the laser of the required frequency and avoiding interference from lasers of other frequencies.

[0041] In the acousto-optic frequency shifting system 1000 of this embodiment, the laser source 300 emits laser light toward the acousto-optic frequency shifter 200. After the laser light undergoes one acousto-optic frequency shift in the acousto-optic frequency shifter 200, it emits a first diffracted light to a retroreflecting mirror device 100. The retroreflecting mirror device 100 reflects the first diffracted light back to the acousto-optic frequency shifter 200 for a second acousto-optic frequency shift. The second diffracted light after the second acousto-optic frequency shift is emitted toward another retroreflecting mirror device 100. The second diffracted light is reflected back to the acousto-optic frequency shifter 200 by the other retroreflecting mirror device 100 for a third acousto-optic frequency shift. The third diffracted light after the third acousto-optic frequency shift is emitted from the acousto-optic frequency shifter 200 toward the laser receiving component 400.

[0042] It should be noted that the number of returning mirror devices 100 can be set not only to 3, but also to 2, 4, 5 or more. In the acousto-optic frequency shifting system 1000, each additional returning mirror device 100 allows the laser to perform one more acousto-optic frequency shift in the acousto-optic frequency shifting system 1000. The number of returning mirror devices 100 in the acousto-optic frequency shifting system 1000 is set according to the frequency range that the actual laser needs to adjust, which will not be elaborated here.

[0043] According to the embodiments of the present invention, the acousto-optic frequency shifting system 1000 reduces the production cost of the acousto-optic frequency shifting system 1000 by setting multiple return mirror devices 100, and enables the acousto-optic frequency shifting system 1000 to achieve multiple precise adjustments of the laser frequency based on a single acousto-optic frequency shifter 200, thereby significantly adjusting the laser frequency and expanding the frequency adjustment range of the acousto-optic frequency shifting system 1000.

[0044] like Figure 1 As shown, in some embodiments of the present invention, at least two retroreflector devices 100 are disposed on opposite sides of the acousto-optic frequency shifter 200. By disposing the retroreflector devices 100 on opposite sides of the acousto-optic frequency shifter 200, the laser passing through the acousto-optic frequency shifter 200 can be reflected back to the acousto-optic frequency shifter 200 from both sides, thereby enabling the acousto-optic frequency shifting system 1000 to perform multiple acousto-optic frequency shifts on the laser, and thus significantly adjusting the frequency of the laser.

[0045] It should be noted that the acousto-optic frequency shifter 200 has a dual-path structure. That is, the laser enters from the first end of the acousto-optic frequency shifter 200, and after being adjusted by the acousto-optic frequency shifter 200, it exits from the opposite second end. At the same time, the laser can also enter the acousto-optic frequency shifter 200 from the second end, and after being adjusted by the acousto-optic frequency shifter 200, it exits from the first end of the acousto-optic frequency shifter 200 opposite to the second end.

[0046] like Figure 1 As shown, in some embodiments of the present invention, the retroreflector device 100 on one side of the acousto-optic frequency shifter 200 is disposed on the same side as the laser source 300 and the laser receiving component 400. Specifically, when the acousto-optic frequency shifting system 1000 has multiple retroreflector devices 100, and the number of retroreflector devices 100 is odd, the retroreflector device 100 on one side of the acousto-optic frequency shifter 200 is disposed on the same side as the laser source 300 and the laser receiving component 400. By disposing of the laser source 300 and the laser receiving component 400 on the same side of the acousto-optic frequency shifter 200, the laser receiving component 400 can accurately receive the diffracted light whose frequency has been adjusted multiple times by the acousto-optic frequency shifter 200, avoiding the laser receiving component 400 not receiving the diffracted light or the retroreflector device 100 not being fully utilized, thereby improving the frequency shifting efficiency of the acousto-optic frequency shifting system 1000.

[0047] For example, when three retroreflector devices 100 are provided, one retroreflector device 100, laser source 300, and laser receiving component 400 are located on one side of the acousto-optic frequency shifter 200, and two other retroreflector devices 100 are located on the opposite side of the acousto-optic frequency shifter 200. During acousto-optic frequency shifting, the laser source 300 emits laser light to the acousto-optic frequency shifter 200. The first diffracted light is reflected back to the acousto-optic frequency shifter 200 by one of the two retroreflector devices 100 for a second acousto-optic frequency shift. The second diffracted light is then reflected back to the acousto-optic frequency shifter 200 by the retroreflector device 100 on the side of the laser source 300 for a third acousto-optic frequency shift. The third diffracted light is reflected back to the acousto-optic frequency shifter 200 by the other of the two retroreflector devices 100 for a fourth acousto-optic frequency shift. Finally, the four diffracted lights are received and utilized by the laser receiving component 400.

[0048] It should be noted that the laser undergoing one acousto-optic frequency shift by the acousto-optic frequency shifter 200 will generate multiple diffracted lights with different frequencies, i.e., multi-order diffracted lights. Among them, the light with the same frequency as the original laser is the zero-order diffracted light, and the laser with the frequency required by the user is the first-order diffracted light. By setting the light-shielding component 20, the first-order diffracted light is allowed to pass through the light-transmitting part 21a, while other diffracted lights are blocked by the light-shielding component 20, thereby achieving the screening of the laser with the required frequency and avoiding interference from lasers of other frequencies.

[0049] In some embodiments of the present invention, the retroreflector device 100 on one side of the acousto-optic frequency shifter 200 is disposed on the same side as the laser source 300, and the retroreflector device 100 on the other side of the acousto-optic frequency shifter 200 is disposed on the same side as the acousto-optic frequency shifter 200. Specifically, when the acousto-optic frequency shifting system 1000 has multiple retroreflector devices 100, and the number of retroreflector devices 100 is even, the laser source 300 and the laser receiving component 400 are disposed on opposite sides of the acousto-optic frequency shifter 200. That is, after the laser emitted by the laser source 300 undergoes multiple acousto-optic frequency shifts by the acousto-optic frequency shifter 200, the laser receiving component 400 can receive the diffracted light from multiple frequency shifts on the opposite side of the acousto-optic frequency shifter 200, thus avoiding the acousto-optic frequency shifting system 1000 not receiving the diffracted light or the retroreflector device 100 not being fully utilized, thereby improving the frequency shifting efficiency of the acousto-optic frequency shifting system 1000.

[0050] For example, when there are four retroreflector devices 100, two retroreflector devices 100 and laser light source 300 are located on one side of the acousto-optic frequency shifter 200, and the other two retroreflector devices 100 and laser receiving component 400 are located on the opposite side of the acousto-optic frequency shifter 200. During the acousto-optic frequency shifting process, the laser source 300 emits a laser beam to the acousto-optic frequency shifter 200 for a first acousto-optic frequency shift. The first diffracted light is reflected back to the acousto-optic frequency shifter 200 by a retroreflecting mirror device 100 on the same side as the laser receiving component 400 for a second acousto-optic frequency shift. The second diffracted light is then reflected back to the acousto-optic frequency shifter 200 by another retroreflecting mirror device 100 on the same side as the laser source 300 for a third acousto-optic frequency shift. The third diffracted light is then reflected back to the acousto-optic frequency shifter 200 by another retroreflecting mirror device 100 on the same side as the laser receiving component 400 for a fourth acousto-optic frequency shift. The fourth diffracted light is then reflected back to the acousto-optic frequency shifter 200 by another retroreflecting mirror device 100 on the same side as the laser source 300 for a fifth acousto-optic frequency shift. Finally, the fifth diffracted light is received and utilized by the laser receiving component 400.

[0051] like Figure 1 As shown, in some embodiments of the present invention, there are at least two return mirror devices 100 on the other side of the acousto-optic frequency shifter 200. Specifically, at least one return mirror device 100 is provided on the side where the laser source 300 of the acousto-optic frequency shifter 200 is located, and at least two return mirror devices 100 are provided on the other side of the acousto-optic frequency shifter 200. By providing multiple return mirror devices 100, the acousto-optic frequency shifting system 1000 can perform at least a 4-fold frequency adjustment, which greatly improves the ability of the acousto-optic frequency shifting system 1000 to adjust the laser frequency.

[0052] like Figure 1As shown, in some embodiments of the present invention, the light-shielding component 20 and two reflective components 30 in the return mirror device 100 on one side of the acousto-optic frequency shifter 200 are arranged horizontally, while the light-shielding component 20 and two reflective components 30 in the return mirror device 100 on the other side of the acousto-optic frequency shifter 200 are arranged vertically. That is, by arranging the light-shielding component 20 and two reflective components 30 of each return mirror device 100 on the first side of the acousto-optic frequency shifter 200 horizontally, and arranging the light-shielding component 20 and two reflective components 30 of each return mirror device 100 on the second side of the acousto-optic frequency shifter 200 vertically, the return mirror device 100 can disperse the diffracted light located on the first side after the laser is reflected back to the acousto-optic frequency shifter 1000 in the horizontal direction, which facilitates the installation and arrangement of the return mirror device 100 on the first side.

[0053] like Figure 1 As shown, in some embodiments of the present invention, the acousto-optic frequency shifting system 1000 further includes a light-blocking component 500, which is disposed between the acousto-optic frequency shifter 200 and the laser receiving component 400, so that the target frequency-shifting beam is directed towards the laser receiving component 400. That is, by setting the light-blocking component 500, the laser frequency of the diffracted light finally directed towards the laser receiving component 400 is filtered. The light-blocking component 500 ensures that the laser of the desired frequency is received by the laser receiving component 400, while other multi-level diffracted beams are blocked by the light-blocking component 500, avoiding interference caused by the multi-level diffracted beams being received by the laser receiving component 400, thus improving the accuracy of laser frequency adjustment by the acousto-optic frequency shifting system 1000.

[0054] like Figure 2 , Figure 3 As shown, in some embodiments of the present invention, the light-shielding component 20 includes a first mounting base 22 and a first adjustment component 23. The first mounting base 22 is disposed on the bracket 10, and the first adjustment component 23 and the light-shielding plate 21 are disposed on the first mounting base 22. The first adjustment component 23 moves in conjunction with two reflective components 30 to synchronously adjust the distance between the two reflectors 31 and the light-shielding plate 21. That is, by setting the first adjustment component 23 to adjust the distance between the two reflectors 31 and the light-shielding plate 21, the first-order diffracted light can pass through the light-transmitting part 21a, while other diffracted light is blocked by the light-shielding plate 21, thereby achieving the filtering of laser light of the required frequency.

[0055] In some embodiments, such as Figure 2 As shown, the light-transmitting part 21a can be configured as a hollow hole extending on the light-shielding plate 21 in a direction perpendicular to the support 10. When multi-level diffracted light is directed toward the retroreflector device 100, the first-level diffracted light passes through the hollow hole, while other diffracted light is blocked by the light-shielding plate 21, thereby achieving the filtering of diffracted light of different frequencies.

[0056] like Figure 2As shown, in some embodiments of the present invention, the reflective component 30 includes a second mounting base 321 movably mounted on the bracket 10, and a reflector 31 is mounted on the second mounting base 321; the first adjustment component 23 includes a first adjustment rod 231, which is pivotally mounted on the first mounting base 22, and both ends of the first adjustment rod 231 are respectively screwed to the second mounting bases 321 of the two reflective components 30. By rotating the first adjustment rod 231, the second mounting bases 321 of the two reflective components 30 can be controlled to move closer or further away from each other. Furthermore, by rotating the first adjustment rod 231, the distance between the two reflective components 30 and the light-shielding plate 21 can be controlled, thereby filtering the diffracted light passing through the light-transmitting part 21a and avoiding interference caused by multi-order diffracted light passing through the light-transmitting part 21a.

[0057] Specifically, the first adjusting rod 231 has a threaded structure, and the second mounting base 321 has a threaded hole that mates with the threaded structure. The first adjusting rod 231 passes through the first mounting base 22 and can rotate on the first mounting base 22 along its axis. When the first adjusting rod 231 rotates clockwise, the two second mounting bases 321 move closer to each other along the axis of the first adjusting rod 231. When the first adjusting rod 231 rotates counterclockwise, the two second mounting bases 321 move further apart along the axis of the first adjusting rod 231. Alternatively, when the first adjusting rod 231 rotates clockwise, the two second mounting bases 321 move further apart along the axis of the first adjusting rod 231. When the first adjusting rod 231 rotates counterclockwise, the two second mounting bases 321 move closer to each other along the axis of the first adjusting rod 231.

[0058] It should be noted that the first adjusting rod 231 can also be set as other structural components that can achieve the above functions, which will not be described in detail here.

[0059] In some embodiments of the present invention, the first mounting base 22 is movably disposed on the bracket 10, and a locking mechanism (not shown) is provided between the first mounting base 22 and the bracket 10. By providing a locking mechanism between the first mounting base 22 and the bracket 10, the mounting position of the first mounting base 22 on the bracket 10 can be arbitrarily adjusted, preventing diffracted light from directly irradiating the light-shielding component 20 without a first reflection, thus expanding the application range of the retroreflector device 100. At the same time, the locking structure makes the first mounting base 22 detachable from the bracket 10, improving the portability of the retroreflector device 100. The locking mechanism can be a stop pin, brake clamp, or other structural component that can achieve the above functions, which will not be described in detail here.

[0060] like Figure 2 As shown, in some embodiments of the present invention, the reflective assembly 30 includes a second adjustment assembly 32, which is connected to the reflector 31 so that the reflector 31 rotates about a first pivot axis (e.g., ...). Figure 3 The reflector 31 is tilted (left and right as shown) to adjust the tilt angle of the reflector 31 relative to the light shield 21. By setting the second adjustment component 32, the angle between the two reflectors 31 of the retroreflector device 100 and the light shield 21 is adjustable, thereby improving the light reflection accuracy of the retroreflector device 100.

[0061] Specifically, when the diffracted light emitted by the acousto-optic frequency shifter 200 is directed toward the retroreflector device 100, the second adjustment component 32 is adjusted so that the diffracted light can be directed toward another reflection component 30 after being reflected once at the position of one reflection component 30, and then directed toward the acousto-optic frequency shifter 200 after being reflected twice at the other reflection component 30.

[0062] like Figure 2 As shown, in some embodiments of the present invention, the reflective assembly 30 includes a third adjustment assembly 33, which is disposed between the second adjustment assembly 32 and the reflector 31, so that the reflector 31 revolves around a second pivot axis (e.g., Figure 2 The second pivot axis is perpendicular to the first pivot axis, and the second pivot axis swings back and forth (as shown). In other words, by setting a third adjustment component 33 between the second adjustment component 32 and the reflector 31, the reflection direction of the diffracted light is further precisely adjusted, which improves the adjustment accuracy of the retroreflector device 100 and enables the retroreflector device 100 to control the reflection direction of the diffracted light more accurately.

[0063] Specifically, when the diffracted light emitted by the acousto-optic frequency shifter 200 is directed toward the retroreflector device 100, the second adjustment component 32 is adjusted to make the diffracted light reflect back to the acousto-optic frequency shifter 200 after two reflections. Furthermore, the angle between the reflector 31 and the light shield 21 is precisely adjusted by the third adjustment component 33 to further control the optical path of the diffracted light, so that the diffracted light passes through the light-transmitting part 21a perpendicularly to the light shield 21, reducing the width of the light-transmitting part 21a, making it easier to separate the first-order diffracted light from other diffracted lights, and avoiding interference from other diffracted lights to the first-order diffracted light.

[0064] It should be noted that the third adjustment component 33 includes multiple bolts 331 and elastic elements 332. The multiple bolts 331 are screwed onto the third mounting base 322 and abut against one side of the reflector 31. One end of the elastic element 332 is connected to the third mounting base 322, and the other end of the elastic element 332 is connected to one end face of the reflector 31 and is located on the same side as the bolts 331. The elastic element 332 has a tendency to contract, causing the reflector 31 to move closer to the bolts 331. The multiple bolts 331 abut against the reflector 31 to fix the reflector 31. At the same time, by controlling the screwing depth of the multiple bolts 331, in conjunction with the contraction of the elastic element 332, the installation angle of the reflector 31 in the third mounting base 322 is controlled. The third adjustment component 33 can also be configured as other structural components capable of achieving the above functions, which will not be described in detail here.

[0065] like Figure 2 As shown, in some embodiments of the present invention, the second adjustment component 32 includes a second mounting base 321, a third mounting base 322, a gear 323, and a rack 324. The second mounting base 321 is mounted on the bracket 10. The third mounting base 322 has a pivot shaft 325, which is pivotally mounted on the second mounting base 321 about a first pivot axis. The gear 323 is mounted on the pivot shaft 325, and the rack 324 is mounted on the second mounting base 321 and meshes with the gear 323. The rack 324 can be adjusted by being driven to move, thereby adjusting the angle between the third mounting base 322 and the second mounting base 321. By providing a gear 323 at one end of the pivot shaft 325, and by having the gear 323 mesh with the rack 324, the control accuracy of the retroreflector device 100 for the laser reflection direction is improved.

[0066] Specifically, the rack 324 is movably mounted on the second mounting base 321, and one end of the rack 324 meshes with the gear 323. When the rack 324 moves in the front-back direction, the gear 323 meshing with the rack 324 is driven to rotate, thereby causing the pivot shaft 325 to rotate around the first pivot axis, that is, controlling the angle between the second mounting base 321 and the third mounting base 322, and finally realizing the precise control of the laser reflection direction by the retroreflector device 100 in the acousto-optic frequency shifting system 1000.

[0067] like Figure 2 , Figure 3 , Figure 4 As shown, in some embodiments of the present invention, a second adjusting rod 40 is provided between the two reflecting components 30. The second adjusting rod 40 is pivotally mounted on two second mounting seats 321. A gear ring 40a is provided on the second adjusting rod 40, and the gear ring 40a meshes with two racks 324. By setting the second adjusting rod 40 to control the movement of the racks 324, the angle between the second mounting seat 321 and the third mounting seat 322 is controlled, thereby improving the control accuracy of the retroreflector device 100.

[0068] Specifically, the rack 324 meshes with the gear ring 40a on the second adjusting rod 40. When the second adjusting rod 40 is rotated, the second adjusting rod 40 drives the rack 324 to move along the direction of the second pivot axis, thereby driving the gear 323 to rotate, and finally controlling the pivot shaft 325 to rotate around the direction of the first pivot axis, that is, controlling the included angle between the second mounting base 321 and the third mounting base 322.

[0069] By setting the first adjusting rod 231 and the second adjusting rod 40, the upper and lower reflective components 30 can move synchronously to change the spacing or deflect the angle synchronously. By setting a rotation scale for the first adjusting rod 231 and the second adjusting rod 40, or by using a servo motor to drive the first adjusting rod 231 and the second adjusting rod 40, the spacing and angle between the upper and lower reflective components 30 can be accurately known. Since the relative positions between the bracket 10 and the first mounting base 22 and the acousto-optic frequency shifter 200 are fixed and known, the angle of the first-order diffraction light incident on the retroreflector device 100 and the angle of the first-order diffraction light emitted from the retroreflector device 100 can be known in real time. Knowing the angle of the first-order diffraction light emitted from the retroreflector device 100, the angle of the first-order diffraction light incident on the acousto-optic frequency shifter 200 can be known. Furthermore, the emission angle of the first-order diffraction light after re-modulation of the first-order diffraction light incident on the acousto-optic frequency shifter 200 and its expected power can be known. This can effectively reduce the workload of complex measurements of the optical path system during optical path adjustment.

[0070] It should be noted that gear 323, rack 324 and second adjusting rod 40 can also be set as other structural components that can achieve the above functions, which will not be described in detail here.

[0071] like Figure 2 , Figure 3 As shown in some embodiments of the present invention, the two reflective components 30 are symmetrically arranged about the light-shielding plate 21 in the vertical direction. That is, by arranging the two reflective components 30 and the light-shielding component 20 in the vertical direction, it is beneficial to save the planar space of the reflected laser beam path of the retroreflector device 100 and improve the integration of the retroreflector device 100.

[0072] It should be noted that the two reflective components 30 can also be symmetrically arranged about the light shield 21 along the horizontal direction. By symmetrically arranging the two reflective components 30 about the light shield 21 along different directions, the retroreflector device 100 can work normally in different working environments. The two reflective components 30 can also be symmetrically arranged about the light shield 21 along other directions, which will not be described in detail here.

[0073] In some embodiments, a locking element is also provided between the second mounting base 321 and the third mounting base 322. By providing the locking element, the third mounting base 322 can be secured after the second adjustment component 32 adjusts the included angle between the second mounting base 321 and the third mounting base 322, preventing slippage after adjustment and improving the reflection accuracy of the retroreflector device 100.

[0074] It should be noted that the locking component can be a stop pin, brake clamp, or other structural component that can achieve the above functions, which will not be elaborated here.

[0075] Other configurations and operations of the acousto-optic frequency shifting system 1000 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0076] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, "first feature" and "second feature" may include one or more of the features. In the description of this invention, "a plurality of" means two or more. In the description of this invention, "above" or "below" the second feature may include direct contact between the first and second features, or it may include contact between the first and second features not in direct contact but through another feature between them.

[0077] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An acousto-optic frequency shifting system characterized by, include: A laser light source, used to emit a beam of light; An acousto-optic frequency shifter is used to receive the light beam emitted by the laser source and perform frequency shifting processing; A laser receiving component is used to receive the light beam emitted after the last frequency shifting process of the acousto-optic frequency shifter; At least two retroreflector devices are provided, each including a support, a light-shielding assembly, and two reflective assemblies. The light-shielding assembly is mounted on the support and includes a light-shielding plate with a light-transmitting portion for transmitting first-order diffracted light while blocking transmitted light and other diffracted light. The two reflective assemblies are mounted on the support and symmetrical about the light-shielding plate. Each reflective assembly includes a reflector that is tilted relative to the light-shielding plate. In each retroreflector device, one of the two reflectors receives a frequency-shifted beam emitted by the acousto-optic frequency shifter, and the other reflects the frequency-shifted beam back to the acousto-optic frequency shifter. At least two of the returning mirror devices are disposed on opposite sides of the acousto-optic frequency shifter. The returning mirror device on one side of the acousto-optic frequency shifter is disposed on the same side as the laser source and the laser receiving component. The light-shielding component and the two reflecting components in the returning mirror device on one side of the acousto-optic frequency shifter are disposed horizontally. The light-shielding component and the two reflecting components in the returning mirror device on the other side of the acousto-optic frequency shifter are disposed vertically.

2. The acousto-optic frequency shifting system according to claim 1, characterized in that, There are at least two return mirror devices on the other side of the acousto-optic frequency shifter.

3. The acousto-optic frequency shifting system according to any one of claims 1 to 2, characterized in that, The acousto-optic frequency shifting system also includes a light-blocking component, which is disposed between the acousto-optic frequency shifter and the laser receiving component, so that the target frequency-shifting beam is directed toward the laser receiving component.

4. The acousto-optic frequency shifting system according to claim 1, characterized in that, The light-shielding assembly includes a first mounting base and a first adjustment assembly. The first mounting base is disposed on the bracket, and the first adjustment assembly and the light-shielding plate are disposed on the first mounting base. The first adjustment assembly moves in conjunction with the two reflective components to synchronously adjust the distance between the two reflectors and the light-shielding plate.

5. The acousto-optic frequency shifting system according to claim 4, characterized in that, The reflective assembly includes a second mounting base movably disposed on the bracket, and the reflector is disposed on the second mounting base; The first adjustment component includes a first adjustment rod, which is pivotally mounted on the first mounting base, and both ends of the first adjustment rod are respectively screwed to the second mounting bases of the two reflective components.

6. The acousto-optic frequency shifting system according to claim 1, characterized in that, The reflective assembly includes a second adjustment assembly connected to the reflector, which causes the reflector to swing about a first pivot axis to adjust the tilt angle of the reflector relative to the light-shielding plate.

7. The acousto-optic frequency shifting system according to claim 6, characterized in that, The reflective assembly includes a third adjustment assembly disposed between the second adjustment assembly and the reflector, so that the reflector swings about a second pivot axis, the second pivot axis being perpendicular to the first pivot axis.

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