A Raman light interference adjustment device and adjustment method for atom interferometer

Abstract

The present invention provides a Raman light interference adjustment device and adjustment method for an atom interferometer, wherein the device includes: a first optical fiber, a first optical fiber collimator, a first half-wave plate, a first polarization beam splitter prism, a second half-wave plate, a second optical fiber collimator, a second optical fiber, a first lens group, a third half-wave plate, a second polarization beam splitter prism, a vacuum chamber, a first reflector, a second reflector, a quarter-wave plate, a third reflector, a second lens group, a third optical fiber, a first detector, a third optical fiber collimator, a fourth optical fiber, and a second detector. The present invention not only ensures the directional consistency of the Raman light effective wave vector, but also controls the magnitude of the Raman light effective wave vector. The present invention has many advantages, including a simple solution, a compact structure, high feasibility, fine adjustment, flexible operation, and high accuracy. The device can meet the application requirements of atom interferometers with high requirements on the direction and magnitude of the Raman light effective wave vector when the interference area is increased, thereby improving the measurement sensitivity of the atom interferometer.

Description

Technical Field

[0001] The present invention relates to the technical field of atomic interferometers, and in particular to a Raman light interference adjustment device and an adjustment method for an atomic interferometer. Background Art

[0002] With the rapid development of laser cooling and atom manipulation technologies, atom interferometers based on two-photon stimulated Raman transitions have seen rapid growth. Due to the atomic matter wave nature of atom interferometers, atomic matter wave interference requires that the position difference between the two coherent paths of the atoms at the moment of the last Raman beam's action be less than or equal to the atomic coherence length. If the distance is greater than the coherence length, the atoms will not interfere.

[0003] The magnitude of the atomic coherent path position difference depends primarily on the size and directional consistency of the effective wave vectors of the multiple Raman beams. Experiments typically ensure the parallelism of the Raman reflectors, thereby ensuring the directional consistency of the effective wave vectors of the Raman beams, but do not control the size of the effective wave vectors of the Raman beams. To improve the measurement sensitivity of atom interferometers, experiments often increase the interference area of ​​the atomic matter waves, which places higher demands on the size and directional consistency of the effective wave vectors of the multiple Raman beams.

[0004] How to control the size and directional consistency of the effective wave vector of Raman light is a crucial factor in improving the measurement sensitivity of atom interferometers. Summary of the Invention

[0005] The present invention provides a solution to the technical problem that the traditional method fails to control the size of the effective wave vector of Raman light, thereby causing adverse effects on the measurement sensitivity of the atom interferometer.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] In a first aspect, the present invention provides a Raman light interferometer adjustment device for an atom interferometer, the device comprising:

[0008] First optical fiber 1, first optical fiber collimator 2, first half wave plate 3, first polarization beam splitter prism 4, second half wave plate 5, second optical fiber collimator 6, second optical fiber 7, first lens group 8, third half wave plate 9, second polarization beam splitter prism 10, vacuum chamber 11, first reflecting mirror 12, second reflecting mirror 13, quarter wave plate 14, third reflecting mirror 15, second lens group 16, third optical fiber 17, first detector 18, third optical fiber collimator 19, fourth optical fiber 20, second detector 21;

[0009] The linearly polarized Raman light passing through the first optical fiber 1 and the first optical fiber collimator 2 changes its polarization direction through the first 1 / 2 wave plate 3 and then passes through the first polarization beam splitter prism 4. It is incident on the second optical fiber collimator 6 through the second 1 / 2 wave plate 5, coupled into the second optical fiber 7, and injected into the first lens group 8 through the second optical fiber 7 for beam expansion to form a circular spot Raman light with good collimation. The polarization direction is changed by the third 1 / 2 wave plate 9, and then it passes through the second polarization beam splitter prism 10 and the vacuum cavity 11. It is reflected by the first reflector 12 and the second reflector 13 in sequence, and then passes through the 1 / 4 wave plate 14 to form a circularly polarized Raman light. It is reflected by the third reflector 15 and then passes through the 1 / 4 wave plate 14. It is reflected by the second reflector 13 and the first reflector 12 in sequence and then passes through the vacuum cavity 11 and the second polarization beam splitter prism 10 again.

[0010] The reflected Raman light is formed into two beams of light s1 and p1 with orthogonal polarizations by the second polarization splitter prism 10. S1 is reflected by the second polarization splitter prism 10 and injected into the second lens group 16, coupled into the third optical fiber 17, and the light intensity is detected by the first detector 18; P1 is transmitted through the third 1 / 2 wave plate 9 by the second polarization splitter prism 10, injected into the second optical fiber 7 and the second optical fiber collimator 6 after passing through the first lens group 8, and is incident on the first polarization splitter prism 4 after passing through the second 1 / 2 wave plate 5 to form two beams of light s2 and p2 with orthogonal polarizations. S2 is reflected by the first polarization splitter prism 4 and injected into the third optical fiber collimator 19, coupled into the fourth optical fiber 20, and the light intensity is detected by the second detector 21.

[0011] Preferably, the light-transmitting surfaces of the first fiber collimator 2, the second fiber collimator 6, the third fiber collimator 19, the first polarization beam splitter prism 4, the second polarization beam splitter prism 10, the first 1 / 2 wave plate 3, the second 1 / 2 wave plate 5, the third 1 / 2 wave plate 9, the first lens group 8, the second lens group 16 and the 1 / 4 wave plate 14 are all coated with Raman light anti-reflection coating.

[0012] Preferably, the reflective surfaces of the first polarization beam splitter prism 4 , the second polarization beam splitter prism 10 , the first reflector 12 , the second reflector 13 , and the third reflector 15 are all coated with a Raman light highly reflective film.

[0013] Preferably, the device further comprises an electrically controlled mirror frame, which is used to adjust the first reflector 12 , the second reflector 13 and the third reflector 15 .

[0014] Preferably, the first detector 18 and the second detector 21 are photodetectors or optical power meters.

[0015] Preferably, the incident Raman light and the reflected Raman light are spatially parallel and overlap with each other.

[0016] Preferably, the transmission direction of the Raman light in the vacuum cavity 11 has a certain angle with the orthogonal direction of the atomic motion in the atomic source, so as to separate the reverse transition spectral line and the same transition spectral line.

[0017] Preferably, the atomic source is an alkali metal.

[0018] Preferably, the alkali metal is cesium.

[0019] In a second aspect, the present invention provides a Raman light interferometer adjustment method for an atom interferometer, using the Raman light interferometer adjustment device for an atom interferometer described in the first aspect, the method comprising:

[0020] S100 adjusts the size and direction consistency of the effective wave vector of Raman light in the atom interferometer, including:

[0021] S101, changing the polarization angle of the quarter wave plate 14 so that the Raman light reflected by the third reflector 15 is in a non-pure linear polarization state, and then passing through the second polarization splitter prism 10 to be split into two beams s1 and p1 with orthogonal polarizations;

[0022] S102, changing the angle of the second reflector 13 to make the direction of the Raman light parallel and achieve directional consistency of the effective wave vector of the Raman light;

[0023] S103, changing the angle of the second half-wave plate 5 so that the light passing through the second half-wave plate 5 and incident on the first polarization beam splitter 4 is split into two beams s2 and p2 with orthogonal polarizations;

[0024] S104, by observing the intensity of the light detected by the second detector 21, further adjusting the angle of the third reflector 15 so that the intensity of the light detected by the second detector 21 is maximized, thereby achieving consistency in the size of the effective wave vector of the Raman light;

[0025] S200 adjusts the polarization direction of Raman light in the atom interferometer, including:

[0026] S201 , by observing the intensity of the light detected by the first detector 18 , the polarization angle of the quarter wave plate 14 is adjusted to maximize the intensity of the light detected by the first detector 18 , thereby ensuring that the Raman light in the vacuum cavity 11 is two linearly polarized Raman lights with orthogonal polarizations.

[0027] In view of the deficiencies in the prior art, the present invention can achieve the following beneficial effects:

[0028] The present invention forms multiple spatially separated Raman lights through the combined application of a series of optical elements, adjusts the reflection angle of the spatially separated Raman lights, and then achieves fine adjustment of the parallelism and size of the effective wave vectors between the separated Raman lights by observing the light intensities detected by two detectors, as well as polarization adjustment of the opposite Raman lights used for interference. On the basis of ensuring the directional consistency of the effective wave vector of the Raman light, the size of the effective wave vector of the Raman light can also be controlled.

[0029] The present invention has many advantages such as simple scheme, compact structure, high feasibility, fine adjustment, flexible operation and high precision. It can meet the application requirements of atom interferometers with high requirements on the direction and size of the effective wave vector of Raman light even when the interference area is increased, and can improve the measurement sensitivity of the atom interferometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0031] Figure 1 This is a schematic structural diagram of a Raman light interferometer adjustment device for an atom interferometer provided in Example 1 of the present invention.

[0032] In the accompanying drawings, like reference numerals are used to denote like components or structures, wherein:

[0033] 1-first optical fiber, 2-first optical fiber collimator, 3-first 1 / 2 wave plate, 4-first polarization beam splitter, 5-second 1 / 2 wave plate, 6-second optical fiber collimator, 7-second optical fiber, 8-first lens group, 9-third 1 / 2 wave plate, 10-second polarization beam splitter, 11-vacuum chamber, 12-first reflector, 13-second reflector, 14-1 / 4 wave plate, 15-third reflector, 16-second lens group, 17-third optical fiber, 18-first detector, 19-third optical fiber collimator, 20-fourth optical fiber, 21-second detector. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0035] In the description of the present invention, the terms "inside", "outside", "longitudinal", "lateral", "upper", "lower", "top", "bottom", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0036] In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] Example 1:

[0038] In order to solve the technical problem that the traditional method fails to control the size of the effective wave vector of Raman light and thus adversely affects the measurement sensitivity of the atom interferometer, this embodiment 1 provides a Raman light interference adjustment device for an atom interferometer, such as Figure 1As shown, the device includes: a first optical fiber 1, a first optical fiber collimator 2, a first 1 / 2 wave plate 3, a first polarization beam splitter prism 4, a second 1 / 2 wave plate 5, a second optical fiber collimator 6, a second optical fiber 7, a first lens group 8, a third 1 / 2 wave plate 9, a second polarization beam splitter prism 10, a vacuum chamber 11, a first reflector 12, a second reflector 13, a 1 / 4 wave plate 14, a third reflector 15, a second lens group 16, a third optical fiber 17, a first detector 18, a third optical fiber collimator 19, a fourth optical fiber 20, and a second detector 21; during the transmission of the incident light, The linearly polarized Raman light passing through the first optical fiber 1 and the first optical fiber collimator 2 is changed in polarization direction by the first 1 / 2 wave plate 3 and then passes through the first polarization beam splitter prism 4. It is incident on the second optical fiber collimator 6 through the second 1 / 2 wave plate 5, coupled into the second optical fiber 7, and injected into the first lens group 8 through the second optical fiber 7 for beam expansion to form a circular spot Raman light with good collimation. After the polarization direction is changed by the third 1 / 2 wave plate 9, it passes through the second polarization beam splitter prism 10 and the vacuum cavity 11, and is reflected by the first reflector 12 and the second reflector 13 in sequence, and then passes through the 1 / 4 wave plate 14 to form a circularly polarized Raman light. After being reflected by the third reflector 15, it passes through the 1 / 4 wave plate 14, and is reflected by the second reflector 13 and the first reflector 12 in sequence, and then passes through the vacuum cavity 11 and the second polarization beam splitter prism 10 again. During the transmission of the reflected light, the reflected Raman light is formed into two beams of light s1 and p1 with orthogonal polarizations by the second polarization beam splitter prism 10. S1 is reflected by the second polarization beam splitter prism 10 and injected into the second lens group 16, coupled into the third optical fiber 17, and the light intensity is detected by the first detector 18. When the light intensity detected by the first detector 18 reaches the maximum, it is ensured that the Raman light in the vacuum cavity 11 is polarized. Two beams of linearly polarized Raman light with orthogonal polarizations; p1 is transmitted through the third 1 / 2 wave plate 9 by the second polarization splitter prism 10, injected into the second optical fiber 7 and the second optical fiber collimator 6 after passing through the first lens group 8, and is incident on the first polarization splitter prism 4 after passing through the second 1 / 2 wave plate 5 to form two beams of light s2 and p2 with orthogonal polarizations, s2 is reflected by the first polarization splitter prism 4 and injected into the third optical fiber collimator 19, coupled into the fourth optical fiber 20, and the light intensity is detected by the second detector 21. When the light intensity detected by the second detector 21 reaches the maximum, the adjustment of the consistency of the effective wave vector size of the Raman light is realized.

[0039] In this embodiment, multiple beams of spatially separated Raman light are formed by the first lens group 8 and the first reflector 12, the second reflector 13, and the third reflector 15, and the reflection angle of the spatially separated Raman light is adjusted. The device is simple and compact in structure. By observing the light intensity detected by the second detector 21, the parallelism and size of the effective wave vectors between the separated Raman lights can be finely adjusted. On the basis of ensuring the directional consistency of the effective wave vector of the Raman light, the size of the effective wave vector of the Raman light can also be controlled. The operation is flexible and the accuracy is high. By observing the light intensity detected by the first detector 18, the polarization adjustment of the opposite Raman light used for interference can be achieved. The solution is simple and feasible. During application, in order to improve the measurement sensitivity of the atom interferometer, even if the atomic matter wave interference area is increased, the higher requirements of the atom interferometer on the direction and size of the effective wave vector of the Raman light can be met.

[0040] In a specific implementation, the linearly polarized Raman light passing through the first optical fiber 1 and the first optical fiber collimator 2 contains light of two frequencies, the frequency difference of which is the difference between the two ground state energy levels of the alkali metal atom hyperfine energy level used in the atomic interferometer, and the specific frequency difference is 9.19263 GHz. The wavelength of the Raman state selection / interference light is around 852 nm. In the process of Raman light transmission, in order to improve the light transmittance of the optical element, the first optical fiber collimator 2, the second optical fiber collimator 6, the third optical fiber collimator 19, the first polarization beam splitter prism 4, the second polarization beam splitter prism 10, the first 1 The light-transmitting surfaces of the first polarization beam splitter 4, the second polarization beam splitter 10, the first reflector 12, the second reflector 13, and the third reflector 15 are all coated with Raman light high-reflection coatings. The Raman light anti-reflection coatings and the Raman light high-reflection coatings are roughly consistent with the wavelength of the Raman selected state / interference light, which is also around 852 nm.

[0041] In order to achieve precise adjustment of the angle of the reflector, this embodiment 1 provides a Raman light interferometer adjustment device for an atom interferometer. The device also includes an electrically controlled mirror frame, through which the first reflector 12, the second reflector 13 and the third reflector 15 can be adjusted. In specific applications, the incident Raman light and the reflected Raman light are parallel to each other and overlap with each other in space.

[0042] In this embodiment, the first detector 18 and the second detector 21 are photodetectors or optical power meters. The transmission direction of the Raman light in the vacuum chamber 11 has a certain angle with the orthogonal direction of the atomic motion in the atomic source, so as to separate the reverse transition spectrum line and the same transition spectrum line. In actual application, the atomic source is an alkali metal, such as sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), francium (Fr) and other alkali metal atomic sources. In the application process, the alkali metal used is cesium, specifically, its mass is 133, that is, 133 cesium (Cs).

[0043] Example 2:

[0044] Based on the same general technical concept as in Example 1, in order to solve the technical problem that conventional methods fail to control the size of the effective wave vector of Raman light, thereby adversely affecting the measurement sensitivity of the atom interferometer, this Example 2 provides a Raman light interferometer adjustment method for an atom interferometer. Using the Raman light interferometer adjustment device for an atom interferometer described in Example 1, the method includes:

[0045] S100, adjusting the size and direction consistency of the effective wave vector of the Raman light in the atom interferometer.

[0046] Among them, Raman light contains two frequencies of light, divided into upper Raman light and lower Raman light. The frequency difference between them is the difference between the two ground state energy levels of the hyperfine energy levels of alkali metal atoms used in the atom interferometer. In specific implementation, the frequency difference is 9.19263GHz.

[0047] In S100, the implementation steps specifically include:

[0048] S101 , changing the polarization angle of the quarter wave plate 14 so that the Raman light reflected by the third reflector 15 is in a non-pure linear polarization state, and is then split into two light beams s1 and p1 with orthogonal polarizations after passing through the second polarization splitter prism 10 .

[0049] The light-transmitting surfaces of the quarter-wave plate 14 and the second polarization beam splitter prism 10 are both coated with a Raman light anti-reflection film, and the reflecting surface of the third reflector 15 is both coated with a Raman light high-reflection film.

[0050] S102, changing the angle of the second reflector 13 to make the directions of the Raman light parallel, thereby achieving directional consistency of the effective wave vector of the Raman light.

[0051] The directions of the Raman light are parallel, that is, the directions of the upper Raman light and the lower Raman light are ensured to be parallel. Similarly, the reflecting surface of the second reflecting mirror 13 is also coated with a Raman light high reflection film.

[0052] S103 , changing the angle of the second half-wave plate 5 so that the light passing through the second half-wave plate 5 and incident on the first polarization beam splitter 4 is split into two light beams s2 and p2 with orthogonal polarizations.

[0053] Similarly, the light-transmitting surfaces of the second half-wave plate 5 and the first polarization beam splitter prism 4 are both coated with Raman light anti-reflection coatings.

[0054] S104 , by observing the intensity of the light detected by the second detector 21 , further adjusting the angle of the third reflector 15 so that the intensity of the light detected by the second detector 21 is maximized, thereby achieving consistency in the size of the effective wave vector of the Raman light.

[0055] The second detector 21 is a photoelectric detector or an optical power meter.

[0056] S200, adjusting the polarization direction of the Raman light in the atom interferometer.

[0057] In S200, the implementation steps specifically include:

[0058] S201 , by observing the intensity of the light detected by the first detector 18 , the polarization angle of the quarter wave plate 14 is adjusted to maximize the intensity of the light detected by the first detector 18 , thereby ensuring that the Raman light in the vacuum cavity 11 is two linearly polarized Raman lights with orthogonal polarizations.

[0059] Similarly, the first detector 18 is a photodetector or an optical power meter.

[0060] In summary, the present invention provides a Raman light interference adjustment device and adjustment method for an atom interferometer. Through the combined application of a series of optical elements, multiple beams of spatially separated Raman light are formed, and the reflection angle of the spatially separated Raman light is adjusted. Then, by observing the light intensities detected by two detectors, fine adjustment of the parallelism and size of the effective wave vectors between the separated Raman lights is achieved, and polarization adjustment of the opposite Raman light used for interference is achieved. On the basis of ensuring the directional consistency of the Raman light effective wave vector, the size of the Raman light effective wave vector can also be controlled. The device has many advantages such as simple scheme, compact structure, high feasibility, fine adjustment, flexible operation, and high precision. It can meet the application requirements of the atom interferometer with high requirements on the direction and size of the Raman light effective wave vector when the interference area is increased, and can improve the measurement sensitivity of the atom interferometer.

[0061] 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 and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A Raman light interference adjustment device for an atom interferometer, characterized in that the device include: A first optical fiber (1), a first optical fiber collimator (2), a first 1 / 2 wave plate (3), a first polarization beam splitter (4), a second 1 / 2 wave plate (5), a second optical fiber collimator (6), a second optical fiber (7), a first lens group (8), a third 1 / 2 wave plate (9), a second polarization beam splitter (10), a vacuum cavity (11), a first reflector (12), a second reflector (13), a 1 / 4 wave plate (14), a third reflector (15), a second lens group (16), a third optical fiber (17), a first detector (18), a third optical fiber collimator (19), a fourth optical fiber (20), and a second detector (21); The linearly polarized Raman light passing through the first optical fiber (1) and the first optical fiber collimator (2) is changed in polarization direction by the first 1 / 2 wave plate (3) and then passes through the first polarization beam splitter prism (4), is incident on the second optical fiber collimator (6) through the second 1 / 2 wave plate (5), is coupled into the second optical fiber (7), is injected into the first lens group (8) through the second optical fiber (7) for beam expansion to form a circular spot Raman light with good collimation, is changed in polarization direction by the third 1 / 2 wave plate (9), then passes through the second polarization beam splitter prism (10) and the vacuum cavity (11), is reflected by the first reflector (12) and the second reflector (13) in sequence, and then passes through the 1 / 4 wave plate (14) to form a circularly polarized Raman light, is reflected by the third reflector (15), then passes through the 1 / 4 wave plate (14), is reflected by the second reflector (13) and the first reflector (12) in sequence, and then passes through the vacuum cavity (11) and the second polarization beam splitter prism (10) again; The reflected Raman light is formed into two beams of light s1 and p1 with orthogonal polarizations by the second polarization beam splitter prism (10). S1 is reflected by the second polarization beam splitter prism (10) and injected into the second lens group (16), coupled into the third optical fiber (17), and the light intensity is detected by the first detector (18); P1 is transmitted through the third 1 / 2 wave plate (9) by the second polarization beam splitter prism (10), injected into the second optical fiber (7) and the second optical fiber collimator (6) after passing through the first lens group (8), and then incident on the first polarization beam splitter prism (4) to form two beams of light s2 and p2 with orthogonal polarizations. S2 is reflected by the first polarization beam splitter prism (4) and injected into the third optical fiber collimator (19), coupled into the fourth optical fiber (20), and the light intensity is detected by the second detector (21).

2. The Raman light interferometer adjustment device for an atom interferometer according to claim 1, characterized in that: The light-transmitting surfaces of the first optical fiber collimator (2), the second optical fiber collimator (6), the third optical fiber collimator (19), the first polarization beam splitter prism (4), the second polarization beam splitter prism (10), the first 1 / 2 wave plate (3), the second 1 / 2 wave plate (5), the third 1 / 2 wave plate (9), the first lens group (8), the second lens group (16) and the 1 / 4 wave plate (14) are all coated with a Raman light anti-reflection film.

3. The Raman light interferometer adjustment device for an atom interferometer according to claim 2, characterized in that: The reflecting surfaces of the first polarization beam splitter prism (4), the second polarization beam splitter prism (10), the first reflector (12), the second reflector (13), and the third reflector (15) are all coated with a Raman light high-reflection film.

4. The Raman light interferometer adjustment device for an atom interferometer according to claim 1, characterized in that: The device also includes an electrically controlled mirror frame, which is used to adjust the first reflector (12), the second reflector (13), and the third reflector (15).

5. The Raman light interferometer adjustment device for an atom interferometer according to claim 1, characterized in that: The first detector (18) and the second detector (21) are photoelectric detectors or optical power meters.

6. The Raman light interferometer adjustment device for an atom interferometer according to claim 1, characterized in that: The propagation direction of Raman light in the vacuum cavity (11) has a certain angle with the orthogonal direction of atomic motion in the atomic source, which is used to separate the reverse transition spectrum line and the same transition spectrum line.

7. The Raman light interferometer adjustment device for an atom interferometer according to claim 6, characterized in that: The atomic source is an alkali metal.

8. The Raman light interferometer adjustment device for an atom interferometer according to claim 7, characterized in that: The alkali metal is cesium.

9. A Raman light interference adjustment method for an atom interferometer, characterized in that: The method of using the Raman light interferometer adjustment device for an atom interferometer according to any one of claims 1 to 8 comprises: S100 adjusts the size and direction consistency of the effective wave vector of Raman light in the atom interferometer, including: S101, changing the polarization angle of the quarter wave plate (14) so ​​that the Raman light reflected by the third reflector (15) is in a non-pure linear polarization state, and is then split into two beams of light s1 and p1 with orthogonal polarizations after passing through the second polarization splitting prism (10); S102, changing the angle of the second reflector (13) to make the direction of the Raman light parallel, thereby achieving directional consistency of the effective wave vector of the Raman light; S103, changing the angle of the second half-wave plate (5) so that the light passing through the second half-wave plate (5) and incident on the first polarization beam splitter (4) is split into two beams of light s2 and p2 with orthogonal polarizations; S104, by observing the intensity of the light detected by the second detector (21), further adjusting the angle of the third reflector (15) so that the intensity of the light detected by the second detector (21) is maximized, thereby achieving consistency in the size of the effective wave vector of the Raman light; S200 adjusts the polarization direction of Raman light in the atom interferometer, including: S201, by observing the intensity of the light detected by the first detector (18), adjusting the polarization angle of the 1 / 4 wave plate (14) so ​​that the intensity of the light detected by the first detector (18) is maximized, ensuring that the Raman light in the vacuum cavity (11) is two linearly polarized Raman lights with orthogonal polarizations.

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