Raman light polarization adjusting device and method for atom interferometer

Abstract

The invention relates to a Raman light polarization adjusting device and method for an atom interferometer, and the device comprises a polarization adjusting assembly which comprises an adjusting seat and a quarter-wave plate capable of rotating around the axis of the polarization adjusting assembly; the polarization calibration assembly comprises a prism table, a polarization splitting prism, a first photoelectric detector and a second photoelectric detector, a small-hole diaphragm is arranged on the prism table, and a first light beam passing through the small-hole diaphragm is divided into a first reflection light beam and transmission light after passing through the polarization splitting prism; a second light beam opposite to the first light beam in direction is divided into a second reflection light beam after passing through the polarization splitting prism, the first photoelectric detector detects the light intensity of the first reflection light beam, and the second photoelectric detector detects the light intensity of the second reflection light beam. According to the invention, polarization state measurement and adjustment of the circularly polarized light combined Raman light and the linearly polarized light combined Raman light can be completed directly on the incident lens of the atom interferometer, a polarization analyzer is not needed, and the complexity of design and adjustment of the Raman light incident lens assembly is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of atom interferometer technology, and in particular to a Raman light polarization regulating device and method for an atom interferometer. Background Art

[0002] Atom interferometers realize atomic interference control through sequence Raman light pulses, among which there are two combinations of Raman light: co-directional Raman light combination and opposite Raman light combination. Co-directional Raman light combination requires that the polarization states of the two Raman lights are circularly polarized light combination, while opposite Raman light combination requires that the polarization states of the two Raman lights are linearly polarized light combination, and the incident Raman light is perpendicular to the polarization state of the reflected Raman light.

[0003] If it is required to use a co-directional Raman light combination, the polarization state of the laser emitted by the Raman light incident lens assembly can be directly measured with a polarization analyzer to make corresponding adjustments. However, the lens needs to be removed from the sensitive unit of the atom interferometer before each adjustment and needs to be installed again after adjustment. However, atom interferometers are currently developing in the direction of miniaturization and engineering. This adjustment method will limit the miniaturization design of the sensitive unit and increase the complexity of installation, adjustment and maintenance. If it is required to use a counter-directional Raman light combination, the polarization state of the reflected Raman light cannot be directly measured with a polarization analyzer, and it cannot be guaranteed that the linear polarization state of the incident Raman light is perpendicular to the linear polarization state of the reflected Raman light. Summary of the invention

[0004] Based on the above description, the present invention provides a Raman light polarization adjustment device and method for an atom interferometer to solve the problem that the adjustment method in the related art is complicated and cannot adjust the opposite Raman light combination.

[0005] The technical solution of the present invention to solve the above technical problems is as follows: In the first aspect, the present application provides a Raman light polarization adjustment device for an atom interferometer, and the technical solution adopted is as follows: A Raman light polarization adjustment device for an atom interferometer, comprising: A polarization adjustment assembly, comprising an adjustment seat and a quarter wave plate connected to the adjustment seat, wherein the quarter wave plate can rotate around its own axis relative to the adjustment seat; A polarization calibration component, comprising a prism seat and a polarization beam splitter prism connected to the prism seat, a first photodetector and a second photodetector, wherein the prism seat is provided with a pinhole diaphragm, a first light beam passing through the pinhole diaphragm along the axial direction of the pinhole diaphragm is divided into a first reflected light beam perpendicular to the original direction and a transmitted light in the same direction as the original direction after passing through the polarization beam splitter prism, and a second light beam in the opposite direction to the first light beam is divided into a second reflected light beam perpendicular to the original direction after passing through the polarization beam splitter prism, the first photodetector is used to detect the light intensity of the first reflected light beam, and the second photodetector is used to detect the light intensity of the second reflected light beam; The adjustment seat is used to be connected to the Raman light incident lens of the atom interferometer, and the axis of the Raman light incident lens is made to coincide with the axis of the quarter wave plate. The prism seat is used to be connected to the adjustment seat and the axis of the pinhole aperture is made to coincide with the axis of the quarter wave plate. The prism seat can rotate relative to the adjustment seat around the axis of the pinhole aperture.

[0006] Preferably, the polarization calibration assembly includes a calibration seat, the prism seat is connected to the calibration seat and can rotate around the axis of the pinhole aperture relative to the calibration seat, and the calibration seat and the adjustment seat are detachably connected.

[0007] Preferably, the calibration seat is provided with a mounting hole with two through ends, the prism seat is embedded in the mounting hole and the axis of the pinhole aperture is coaxial with the mounting hole, the prism seat can rotate around the axis of the pinhole aperture relative to the calibration seat, and the side wall of the calibration seat is provided with a first adjustment groove that penetrates through, and the first adjustment groove extends circumferentially along the mounting hole.

[0008] Preferably, the prism seat is cylindrical and coaxial with the pinhole aperture, the mounting hole includes an adjustment section, the prism seat is embedded in the adjustment section and the outer diameter is consistent with the diameter of the adjustment section, and a first locking bolt is threadedly assembled on the side wall of the calibration seat, which is suitable for tightening the prism seat through the first locking bolt to limit the rotation of the prism seat relative to the mounting tube.

[0009] Preferably, the adjustment seat includes a mounting tube, the quarter wave plate is connected to the wave plate seat, the wave plate seat coaxial ring is arranged outside the quarter wave plate and is fixed to the quarter wave plate, the wave plate seat is embedded in the mounting tube and is coaxial with the mounting tube, the wave plate seat can rotate around the quarter wave plate axis relative to the mounting tube, and a second adjustment groove is provided on the side wall of the mounting tube, and the second adjustment groove extends circumferentially along the mounting tube.

[0010] Preferably, the inner diameter of the mounting tube is consistent with the outer diameter of the wave plate seat, and a second locking bolt is threadedly mounted on the side wall of the mounting tube, which is suitable for tightening the wave plate seat through the second locking bolt to limit the rotation of the wave plate seat relative to the mounting tube.

[0011] Preferably, the transmission extinction ratio and reflection extinction ratio of the polarization beam splitter prism are both not less than 3000:1.

[0012] In a second aspect, the present application provides a Raman light polarization adjustment method for an atom interferometer, which uses the Raman light polarization adjustment device for an atom interferometer as described above for adjustment, comprising: Connecting the adjustment seat to the Raman light incident lens of the atom interferometer, and making the axis of the Raman light incident lens coincide with the axis of the quarter wave plate; connecting the prism seat to the adjustment seat, and making the axis of the pinhole aperture coincide with the axis of the quarter wave plate; and the quarter wave plate, the prism seat and the polarization beam splitter prism are sequentially distributed in a direction away from the Raman light incident lens; If the Raman light is a combination of circularly polarized light, it includes: S11: Fix the prism holder, rotate the wave plate holder until the light intensity I1 of the first reflected light beam is the maximum, and record the maximum light intensity at this time as a; S12: Fix the prism holder and rotate the wave plate holder so that the light intensity I1 of the first reflected light beam and the light intensity I2 of the second reflected light beam satisfy I1=2I2=a / 2; S13: Fix the wave plate holder and rotate the prism holder. If the sizes of I1 and I2 remain unchanged, the adjustment of the circular polarization state of the Raman light is completed; if the sizes of I1 and I2 change, repeat step S12 until the sizes of I1 and I2 remain unchanged, and the adjustment of the circular polarization state of the Raman light is completed; If the Raman light is a combination of linearly polarized light, it includes: S21: Fix the prism holder and rotate the wave plate holder until I1 is minimum; S22: Fix the wave plate holder and rotate the prism holder until I2 is minimum; S23: Repeat steps S21 and S22 until I1=I2=0, and the adjustment of the polarization state of the Raman light is completed.

[0013] Compared with the prior art, the technical solution of the present application has at least the following beneficial technical effects: 1. The present application sets a polarization adjustment component and a polarization calibration component. The polarization adjustment component is installed on the Raman light incident lens, and the outgoing Raman light of the atomic interferometer passes through a quarter wave plate and then is emitted. When adjusting the Raman light, the prism seat in the polarization calibration component is installed on the adjustment seat so that the axis of the pinhole aperture coincides with the axis of the quarter wave plate, and the quarter wave plate, the prism seat and the polarization beam splitter prism are sequentially distributed along the direction away from the Raman light incident lens. The outgoing Raman light of the atom interferometer passes through the pinhole aperture after passing through the quarter wave plate, and is divided into a first reflected light beam after passing through the polarization beam splitter prism, that is, the first light beam is the outgoing Raman light, and the reflected Raman light of the atom interferometer passes through the polarization beam splitter prism in the opposite direction to the first light beam and is divided into a second reflected light beam. The first photodetector and the second photodetector respectively detect the light intensity of the first reflected light beam and the second reflected light beam, so that the polarization state of the outgoing Raman light and the reflected Raman light can be evaluated by the combination of the polarization beam splitter prism and the two photodetectors. The polarization splitter prism can be rotated by rotating the quarter wave plate and the prism seat to adjust the size of the first reflected light beam and the second reflected light beam, so that the light intensity of the first reflected light beam and the second reflected light beam can be adjusted to a set value according to the requirements of the Raman light circularly polarized light combination or the linearly polarized light combination to complete the Raman light polarization adjustment, and can realize the adjustment of the incident Raman light and the polarization state of the reflected Raman light perpendicularly. After the adjustment is completed, the polarization calibration component can be removed. Therefore, the present application can complete the polarization state measurement and adjustment of the circularly polarized light combination Raman light and the linearly polarized light combination Raman light. The measurement and adjustment can be performed directly on the Raman light incident lens of the atom interferometer, and there is no need to use a polarization analyzer for measurement, which effectively reduces the complexity of the design and installation of the Raman light incident lens component.

[0014] 2. The polarization calibration assembly of the present application is provided with a calibration seat, and the prism seat is installed on the calibration seat. The calibration seat is connected to the adjustment seat to connect the prism seat to the adjustment seat and realize its rotatable connection, which can facilitate the connection between the polarization calibration assembly and the polarization adjustment assembly, and the polarization calibration assembly can be used as an integral component for use when performing Raman light polarization adjustment work, thereby improving the convenience of use.

[0015] 3. In the adjustment method of the present application, the Raman light as a circularly polarized light combination and the Raman light as a linearly polarized light combination are adjusted separately, which is simple to operate and can quickly complete the adjustment of the polarization state of the Raman light. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a Raman light polarization adjustment device for an atom interferometer provided in an embodiment of the present invention; Figure 2 A schematic structural diagram of a combination of a polarization adjustment component and a polarization calibration component in a Raman light polarization adjustment device for an atom interferometer provided in an embodiment of the present invention.

[0017] Description of reference numerals: 1. Polarization adjustment assembly; 11. Adjustment seat; 111. Mounting tube; 1111. Second adjustment slot; 112. Mounting box; 1121. Accommodating cavity; 1122. Connecting plate; 1123. Through hole; 1124. Socket; 1125. Operating hole; 12. Quarter wave plate; 13. Wave plate seat; 14. Pressing ring; 15. Second locking bolt; 2. Polarization calibration assembly; 21. Calibration seat; 211. First adjustment slot; 22. Prism seat; 23. Pinhole diaphragm; 24. Polarization beam splitter; 25. First photodetector; 26. Second photodetector; 27. First locking bolt. DETAILED DESCRIPTION

[0018] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0020] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0021] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element, or connected to the other element through an intermediate element. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0022] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0023] Reference Figure 1 and Figure 2 As shown, an embodiment of the present application provides a Raman light polarization adjustment device for an atom interferometer, comprising a polarization adjustment component 1 and a polarization calibration component 2, wherein the polarization adjustment component 1 is used to be connected to the Raman light incident lens of the atom interferometer to adjust the polarization state of the outgoing Raman light, and the polarization calibration component 2 is used to be connected to the polarization adjustment component 1 to measure the polarization states of the outgoing Raman light and the reflected Raman light.

[0024] Reference Figure 1 and Figure 2 As shown, the polarization adjustment component 1 includes an adjustment seat 11 and a quarter wave plate 12 connected to the adjustment seat 11, the quarter wave plate 12 can rotate around its own axis relative to the adjustment seat 11, and the adjustment seat 11 is used to be connected to the Raman light incident lens of the atom interferometer, and make the axis of the Raman incident lens coincide with the axis of the quarter wave plate 12.

[0025] Reference Figure 1 and Figure 2 As shown, the adjustment seat 11 includes a mounting tube 111, a quarter wave plate 12 is connected to a wave plate seat 13, a coaxial ring of the wave plate seat 13 is arranged outside the quarter wave plate 12 and is fixed to the quarter wave plate 12, the wave plate seat 13 is embedded in the mounting tube 111 and is coaxial with the mounting tube 111, and the wave plate seat 13 can rotate around the axis of the quarter wave plate 12 relative to the mounting tube 111.

[0026] Reference Figure 1 and Figure 2As shown, specifically, the adjustment seat 11 also includes a connecting plate 1122, a through hole 1123 is provided on the connecting plate 1122, the mounting tube 111 is arranged around the through hole 1123 and fixed to the connecting plate 1122, the diameter of the through hole 1123 is smaller than the inner diameter of the mounting tube 111, the wave plate seat 13 is embedded in the mounting hole and one end is against the connecting plate 1122, and a pressing ring 14 is provided at one end of the mounting tube 111 away from the connecting plate 1122, the pressing ring 14 is threadedly connected to the mounting tube 111 and contacts the wave plate seat 13, so that the wave plate seat 13 is limited to move axially through the cooperation of the pressing ring 14 and the connecting plate 1122, and the wave plate seat 13 can rotate around the axis of the quarter wave plate 12. The inner diameter of the mounting tube 111 is consistent with the outer diameter of the wave plate seat 13, so as to limit the radial movement of the wave plate seat 13. In addition, bolt holes for fixing the adjustment seat 11 with the Raman incident lens are provided so that the connecting plate 1122 can be fixed to the Raman incident lens by bolts. When designing, when the connecting plate 1122 is fixed to the Raman incident lens, the axis of the quarter wave plate 12 coincides with the axis of the Raman incident lens. At this time, the outgoing Raman light of the Raman incident lens passes through the quarter wave plate 12 and then is emitted. When the wave plate seat 13 is rotated to rotate the quarter wave plate 12, the polarization state of the outgoing Raman light can be adjusted.

[0027] Reference Figure 1 and Figure 2 As shown, further, a second adjustment groove 1111 is provided on the side wall of the mounting tube 111, and the second adjustment groove 1111 extends circumferentially along the mounting tube 111, so that a person can use a tool to pass through the second adjustment groove 1111 to move the wave plate seat 13 to rotate. At the same time, a second locking bolt 15 is threadedly mounted on the side wall of the mounting tube 111, which is suitable for tightening the wave plate seat 13 through the second locking bolt 15 to limit the rotation of the wave plate seat 13 relative to the mounting tube 111. When adjusting the polarization state of Raman light, the second locking bolt 15 is loosened, and a person can use a tool to pass through the second adjustment groove 1111 to move the wave plate seat 13 to rotate it, thereby rotating the quarter wave plate 12. After the adjustment is completed, the second locking bolt 15 is tightened against the wave plate seat 13 to limit the rotation of the wave plate seat 13 relative to the mounting tube 111, so as to fix the quarter wave plate 12.

[0028] Reference Figure 1 and Figure 2As shown, the polarization calibration assembly 2 includes a prism seat 22 and a polarization beam splitter prism 24 connected to the prism seat 22, a first photodetector 25 and a second photodetector 26. The prism seat 22 is provided with a pinhole diaphragm 23. A first light beam passing through the pinhole diaphragm 23 along the axial direction of the pinhole diaphragm 23 is divided into a first reflected light beam perpendicular to the original direction and a transmitted light in the same direction as the original direction after passing through the polarization beam splitter prism 24. A second light beam in the opposite direction to the first light beam is divided into a second reflected light beam perpendicular to the original direction after passing through the polarization beam splitter prism 24. The first photodetector 25 is used to detect the light intensity of the first reflected light beam, and the second photodetector 26 is used to detect the light intensity of the second reflected light beam. In this embodiment, the directions of the first reflected light beam and the second reflected light beam are opposite to each other.

[0029] Reference Figure 1 and Figure 2 As shown, specifically, the polarization beam splitter prism 24, the first photodetector 25 and the second photodetector 26 are all fixed on one side of the prism seat 22, and the first photodetector 25 and the second photodetector 26 are respectively located on opposite sides of the polarization beam splitter prism 24. When the first photodetector 25 and the second photodetector 26 are arranged, it is necessary to ensure that the first reflected light beam and the second reflected light beam are respectively vertically incident on the center of the photosensitive surface of the photodetector. The transmission extinction ratio and the reflection extinction ratio of the polarization beam splitter prism 24 are not less than 3000:1.

[0030] Reference Figure 2As shown, when adjusting the Raman light, the prism seat 22 is installed on the adjustment seat 11 and the axis of the pinhole diaphragm 23 is made to coincide with the axis of the quarter-wave plate 12, and the prism seat 22 can rotate relative to the adjustment seat 11 around the axis of the pinhole diaphragm 23. The outgoing Raman light of the atomic interferometer Raman light incident lens passes through the quarter-wave plate 12 and the pinhole diaphragm 23, and is divided into a first reflected light beam and a transmitted light after passing through the polarization beam splitter prism 24, that is, the first light beam is the outgoing Raman light. The transmitted light is reflected by the Raman light reflector of the atomic interferometer to form a reflected Raman light in the opposite direction to the first light beam. The reflected Raman light is divided into a second reflected light beam through the polarization beam splitter prism 24, that is, the second light beam is the reflected Raman light. The first photodetector 25 and the second photodetector 26 detect the light intensity of the first reflected light beam and the second reflected light beam respectively, so that the polarization state of the outgoing Raman light and the reflected Raman light can be evaluated by the combination of the polarization beam splitter prism 24 and the two photodetectors. Rotate the quarter wave plate 12 and the prism seat 22 to rotate the polarization beam splitter prism 24 to adjust the size of the first reflected light beam and the second reflected light beam, so that the light intensity of the first reflected light beam and the second reflected light beam can be adjusted to a set value according to the requirements of the Raman light circularly polarized light combination or the linearly polarized light combination to complete the Raman light polarization adjustment, and can achieve the adjustment of the incident Raman light and the reflected Raman light polarization state perpendicular to each other. After the adjustment is completed, the polarization calibration component 2 can be removed. The polarization state measurement and adjustment of the circularly polarized light combination Raman light and the linearly polarized light combination Raman light can be completed, and the measurement and adjustment can be performed directly on the Raman incident lens of the atom interferometer, without the need to use a polarization analyzer for measurement, which effectively reduces the complexity of the Raman light incident lens component design and assembly.

[0031] Reference Figure 1 and Figure 2 As shown, the polarization calibration assembly 2 also includes a calibration seat 21, a prism seat 22 is connected to the calibration seat 21 and can rotate relative to the calibration seat 21 around the axis of the pinhole aperture 23, and the calibration seat 21 and the adjustment seat 11 can be detachably connected.

[0032] Reference Figure 1 and Figure 2As shown, the calibration seat 21 is provided with a mounting hole with two ends through, the prism seat 22 is embedded in the mounting hole and the axis of the pinhole aperture 23 is coaxial with the mounting hole, the prism seat 22 can rotate relative to the calibration seat 21 around the axis of the pinhole aperture 23, and the side wall of the calibration seat 21 is provided with a first adjustment groove 211 that penetrates, and the first adjustment groove 211 extends along the circumference of the mounting hole. Specifically, the mounting hole includes an adjustment section and a receiving section, the diameter of the adjustment section is larger than the diameter of the receiving section, the prism seat 22 is embedded in the adjustment section, and the polarization beam splitter prism 24, the first photodetector 25 and the second photodetector 26 are located in the receiving section, and one side of the prism seat 22 is in contact with the stepped surface between the adjustment section and the receiving section to limit the prism seat 22 from moving axially toward the receiving section. When the polarization beam splitter prism 24 needs to be rotated, a person uses a tool to pass through the first adjustment groove 211 to move the prism seat 22 to rotate it, thereby rotating the polarization beam splitter prism 24.

[0033] Reference Figure 1 and Figure 2 As shown, further, the prism seat 22 is set to be cylindrical and coaxial with the small aperture diaphragm 23, the outer diameter of the prism seat 22 is consistent with the diameter of the adjustment section, and the first locking bolt 27 is threadedly assembled on the side wall of the calibration seat 21, which is suitable for tightening the prism seat 22 through the first locking bolt 27 to limit the rotation of the prism seat 22 relative to the mounting tube 111. That is, the prism seat 22 can be fixed by the first locking bolt 27, so that the polarization beam splitter prism 24 is fixed.

[0034] Reference Figure 1 and Figure 2 As shown, further, in order to quickly install the calibration seat 21 on the adjustment seat 11, the adjustment seat 11 is configured to include a mounting box 112, and a cylindrical accommodating cavity 1121 is provided in the mounting box 112. One end of the accommodating cavity 1121 is through, and the end wall of the other end forms a connecting plate 1122. Correspondingly, a through hole 1123 on the connecting plate 1122 is connected to the accommodating cavity 1121. A socket 1124 for inserting the calibration seat 21 is provided on the side wall of the accommodating cavity 1121. One side surface of the calibration seat 21 is configured to be an arc surface adapted to the inner wall of the accommodating cavity 1121. When the calibration seat 21 is inserted into the socket 1124 until the arc surface abuts against the side wall of the accommodating cavity 1121, the pinhole diaphragm 23 is coaxial with the quarter-wave plate 12, and the calibration seat 21 is fixed to the adjustment seat 11 by bolts. Thus, the polarization calibration assembly 2 can be quickly connected to the polarization adjustment assembly 1.

[0035] Reference Figure 1 and Figure 2 As shown, correspondingly, operating holes 1125 connected to the accommodating cavity 1121 are respectively provided on the side wall of the mounting box 112 at the positions of the first adjustment groove 211 and the first locking bolt 27, so that personnel can use tools to pass through the operating hole 1125 and the first adjustment groove 211 to rotate the prism seat 22, or tighten the first locking bolt 27.

[0036] This embodiment further provides a Raman light polarization adjustment method for an atom interferometer, which uses the Raman light polarization adjustment device for an atom interferometer as described above to perform adjustment, including: The adjustment seat 11 is connected to the Raman incident lens of the atom interferometer, and the axis of the Raman incident lens is made to coincide with the axis of the quarter wave plate 12. The prism seat 22 is connected to the adjustment seat 11 and the axis of the pinhole aperture 23 is made to coincide with the axis of the quarter wave plate 12. The quarter wave plate 12, the prism seat 22 and the polarization beam splitter prism 24 are sequentially distributed in a direction away from the Raman incident lens. Specifically, the adjustment seat 11 is fixed to the Raman incident lens by bolts, the calibration seat 21 is inserted into the socket 1124 of the adjustment seat 11 and the prism seat 22 is brought close to the quarter wave plate 12. After the calibration seat 21 is inserted into place, the calibration seat 21 is fixed to the adjustment seat 11 by bolts. At this time, the outgoing Raman light of the atom interferometer passes through the quarter-wave plate 12, the pinhole aperture 23 and the polarization beam splitter prism 24 in sequence, and is divided into a first reflected light beam when passing through the polarization beam splitter prism 24, and the light intensity is detected by the first photodetector 25. The reflected Raman light is divided into a second reflected light beam after passing through the polarization beam splitter prism 24, and the light intensity is detected by the second photodetector 26.

[0037] If the Raman light is a combination of circularly polarized light, the specific adjustment steps include: S11: fix the prism holder 22, rotate the wave plate holder 13 until the light intensity I1 of the first reflected light beam is maximum, and record the maximum light intensity of the first reflected light beam at this time as a.

[0038] S12: Fix the prism holder 22 and rotate the wave plate holder 13 so that the light intensity I1 of the first reflected light beam and the light intensity I2 of the second reflected light beam satisfy I1=2I2=a / 2.

[0039] S13: Fix the wave plate holder 13 and rotate the prism holder 22. If the sizes of I1 and I2 remain unchanged, the adjustment of the circular polarization state of the Raman light is completed; if the sizes of I1 and I2 change, repeat step S12 until the sizes of I1 and I2 remain unchanged, and the adjustment of the circular polarization state of the Raman light is completed.

[0040] If the Raman light is a combination of linearly polarized light, the specific adjustment steps include: S21: Fix the prism holder 22 and rotate the wave plate holder 13 until I1 is minimum.

[0041] S22: Fix the wave plate holder 13 and rotate the prism holder 22 until I2 is minimum.

[0042] S23: Repeat steps S21 and S22 until I1=I2=0, and the adjustment of the polarization state of the Raman light is completed.

[0043] Furthermore, for Raman light that is a combination of linearly polarized light, polarization adjustment can also be achieved by adjusting the quarter wave plate in front of the Raman reflector of the atom interferometer.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A Raman light polarization adjustment device for an atom interferometer, characterized in that: include: A polarization adjustment component (1), comprising an adjustment seat (11) and a quarter-wave plate (12) connected to the adjustment seat (11), wherein the quarter-wave plate (12) can rotate around its own axis relative to the adjustment seat (11); A polarization calibration component (2) comprises a prism seat (22), a polarization beam splitter prism (24) connected to the prism seat (22), a first photodetector (25) and a second photodetector (26); the prism seat (22) is provided with a pinhole diaphragm (23); a first light beam passing through the pinhole diaphragm (23) along the axial direction of the pinhole diaphragm (23) is divided into a first reflected light beam perpendicular to the original direction and a transmitted light in the same direction as the original direction after passing through the polarization beam splitter prism (24); a second light beam in the opposite direction to the first light beam is divided into a second reflected light beam perpendicular to the original direction after passing through the polarization beam splitter prism (24); the first photodetector (25) is used to detect the light intensity of the first reflected light beam, and the second photodetector (26) is used to detect the light intensity of the second reflected light beam; The adjustment seat (11) is used to be connected to the Raman light incident lens of the atom interferometer and make the axis of the Raman light incident lens coincide with the axis of the quarter wave plate (12); the prism seat (22) is used to be connected to the adjustment seat (11) and make the axis of the pinhole diaphragm (23) coincide with the axis of the quarter wave plate (12); and the prism seat (22) can rotate relative to the adjustment seat (11) around the axis of the pinhole diaphragm (23).

2. The Raman light polarization adjustment device for an atom interferometer according to claim 1, characterized in that: The polarization calibration assembly (2) comprises a calibration seat (21), the prism seat (22) is connected to the calibration seat (21) and can rotate relative to the calibration seat (21) around the axis of the pinhole aperture (23), and the calibration seat (21) and the adjustment seat (11) can be detachably connected.

3. The Raman light polarization adjustment device for an atom interferometer according to claim 2, characterized in that: The calibration seat (21) is provided with a mounting hole with two through ends, the prism seat (22) is embedded in the mounting hole and the axis of the pinhole diaphragm (23) is coaxial with the mounting hole, the prism seat (22) can rotate relative to the calibration seat (21) around the axis of the pinhole diaphragm (23), and a first adjustment groove (211) is provided on the side wall of the calibration seat (21), and the first adjustment groove (211) extends along the circumference of the mounting hole.

4. The Raman light polarization adjustment device for an atom interferometer according to claim 3, characterized in that: The prism seat (22) is cylindrical and coaxial with the pinhole diaphragm (23); the mounting hole comprises an adjustment section, the prism seat (22) is embedded in the adjustment section and the outer diameter is consistent with the diameter of the adjustment section; a first locking bolt (27) is threadedly mounted on the side wall of the calibration seat (21), and is suitable for tightening the prism seat (22) through the first locking bolt (27) to limit the rotation of the prism seat (22) relative to the mounting tube (111).

5. The Raman light polarization adjustment device for an atom interferometer according to claim 1, characterized in that: The adjustment seat (11) comprises a mounting tube (111); the quarter wave plate (12) is connected to a wave plate seat (13); a coaxial ring of the wave plate seat (13) is arranged outside the quarter wave plate (12) and is fixed to the quarter wave plate (12); the wave plate seat (13) is embedded in the mounting tube (111) and is coaxial with the mounting tube (111); the wave plate seat (13) can rotate relative to the mounting tube (111) around the axis of the quarter wave plate (12); a second adjustment groove (1111) is provided on a side wall of the mounting tube (111); and the second adjustment groove (1111) extends circumferentially along the mounting tube (111).

6. The Raman light polarization adjustment device for an atom interferometer according to claim 5, characterized in that: The inner diameter of the mounting tube (111) is consistent with the outer diameter of the wave plate seat (13), and a second locking bolt (15) is threadedly mounted on the side wall of the mounting tube (111), which is suitable for tightening the wave plate seat (13) through the second locking bolt (15) to limit the rotation of the wave plate seat (13) relative to the mounting tube (111).

7. The Raman light polarization adjustment device for an atom interferometer according to claim 1, characterized in that: The transmission extinction ratio and the reflection extinction ratio of the polarization beam splitting prism (24) are both not less than 3000:

1.

8. A Raman light polarization adjustment method for an atom interferometer, characterized in that: The adjustment is performed using the Raman light polarization adjustment device for an atom interferometer as claimed in any one of claims 1 to 7, comprising: The adjustment seat (11) is connected to the Raman light incident lens of the atom interferometer, and the axis of the Raman light incident lens is made to coincide with the axis of the quarter wave plate (12); the prism seat (22) is connected to the adjustment seat (11) and the axis of the pinhole aperture (23) is made to coincide with the axis of the quarter wave plate (12); and the quarter wave plate (12), the prism seat (22) and the polarization beam splitter prism (24) are sequentially distributed in a direction away from the Raman light incident lens; If the Raman light is a combination of circularly polarized light, it includes: S11: fix the prism seat (22), rotate the wave plate seat (13) until the light intensity I1 of the first reflected light beam is maximum, and record the maximum light intensity at this time as a; S12: fixing the prism seat (22) and rotating the wave plate seat (13) so that the light intensity I1 of the first reflected light beam and the light intensity I2 of the second reflected light beam satisfy I1=2I2=a / 2; S13: fixing the wave plate holder (13) and rotating the prism holder (22); if the sizes of I1 and I2 remain unchanged, the adjustment of the circular polarization state of the Raman light is completed; if the sizes of I1 and I2 change, repeating step S12 until the sizes of I1 and I2 remain unchanged, and the adjustment of the circular polarization state of the Raman light is completed; If the Raman light is a combination of linearly polarized light, it includes: S21: fix the prism holder (22) and rotate the wave plate holder (13) until I1 is minimum; S22: fix the wave plate holder (13), and rotate the prism holder (22) until I2 is minimum; S23: Repeat steps S21 and S22 until I1=I2=0, and the adjustment of the polarization state of the Raman light is completed.

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