Adjustable polarizing collimator for atomic gravimeter

Abstract

The utility model relates to atomic absolute gravimeter technical field especially is applicable to adjustable polarization collimating lens of atomic gravimeter. The adjustable polarization collimating lens includes the liquid crystal wave sheet and wave sheet of setting in adjustable polarization collimating lens inside, liquid crystal wave sheet links to each other with voltage output module, and voltage output module is used for applying different voltage to liquid crystal wave sheet, and adjustable polarization collimating lens receives the space light, and liquid crystal wave sheet is used for under the action of different voltage, to the space light introduction different phase delay, to adjust the polarization direction of space light, and wave sheet is used for adjusting the polarization direction of space light. Through voltage output module to liquid crystal wave sheet applies different voltage to introduce different phase delay to space light, so that in the experimental process need not to adjust the optical axis direction of multiple polaroid, has promoted the convenience and adjustment accuracy of polarization state regulation operation, need not to set up multiple polaroid, has reduced the device quantity of light path involved and made the light path stability get the promotion.

Description

Technical Field

[0001] This utility model relates to the field of atomic absolute gravimeter technology, and in particular to an adjustable polarization collimator suitable for atomic gravimeters. Background Technology

[0002] Atomic gravimeters use the hyperfine energy levels of atoms as sensitive probes to measure gravitational acceleration. The polarization state of the laser interacting with the atoms is a key parameter affecting the instrument's performance. Ideally, circularly polarized light can drive specific atomic transitions with maximum efficiency and effectively suppress unnecessary energy level transitions, thereby improving the signal-to-noise ratio and measurement accuracy.

[0003] Existing adjustable polarization optical path schemes typically involve fixing multiple polarizers behind the output end of a collimating lens to generate the desired polarized light. By adjusting the optical axis direction of these polarizers, linearly polarized light is converted into spatial light with a preset polarization state. The disadvantages of this scheme are: First, it is cumbersome and inaccurate to debug. Once installed and debugged, the output polarization state cannot be changed quickly. During experiments, it is sometimes necessary to dynamically switch the polarization state based on atomic states, environmental noise, or different measurement modes. Changing the polarization state requires manually and precisely rotating multiple polarizers, a process that is time-consuming, inaccurate, and may introduce mechanical vibrations that interfere with precise measurements. Second, the large number of components inevitably leads to lower stability of the optical path.

[0004] Therefore, overcoming the shortcomings of the existing technology is an urgent problem to be solved in this technical field. Utility Model Content

[0005] The technical problem to be solved by this invention is that existing adjustable polarization optical path solutions suffer from problems such as cumbersome debugging, low accuracy, and instability caused by a large number of components.

[0006] The present invention adopts the following technical solution: This utility model provides an adjustable polarization collimator suitable for atomic gravimeters, including a liquid crystal waveplate 1 and a waveplate 2 disposed inside the adjustable polarization collimator; The liquid crystal waveplate 1 is connected to the voltage output module 30. The voltage output module 30 is used to apply different voltages to the liquid crystal waveplate 1. The adjustable polarization collimator receives spatial light. The liquid crystal waveplate 1 is used to introduce different phase delays to the spatial light under different voltages in order to adjust the polarization direction of the spatial light. The waveplate 2 is used to further adjust the polarization direction of the spatial light.

[0007] Furthermore, the liquid crystal waveplate 1 includes a transparent liquid crystal cell, the interior of which is filled with a liquid crystal molecule solution to form the liquid crystal waveplate 1. Applying different voltages to the liquid crystal waveplate 1 can change the alignment direction of the liquid crystal molecules, thereby changing the phase delay introduced by the liquid crystal waveplate 1.

[0008] Furthermore, the liquid crystal cell is coated with an anti-reflection film 13, which can be used to improve the transmittance of spatial light.

[0009] Furthermore, a transparent conductive film 10 is deposited on two opposing parallel surfaces of the liquid crystal waveplate 1, and the transparent conductive film 10 is used to apply voltage to the liquid crystal waveplate 1.

[0010] Furthermore, the voltage output module 30 is connected to the two transparent conductive films 10 via the first signal line group 300; The first signal line group 300 includes a positive signal line and a negative signal line. The negative signal line is connected to one of the transparent conductive films 10, and the positive signal line is connected to the other transparent conductive film 10, so as to output a corresponding voltage to the liquid crystal waveplate 1.

[0011] Furthermore, the liquid crystal wave plate 1 is disposed inside the housing 4.

[0012] Furthermore, the outer wall of the outer casing 4 is wrapped with a heating film for temperature regulation, and a thermistor is provided inside the outer casing 4.

[0013] Furthermore, the adjustable polarization collimator also includes a lens 5, which is arranged along the optical path propagation direction of the waveplate 2 and is used to collimate and shape the spatial light after the polarization state is adjusted.

[0014] Furthermore, the adjustable polarization collimator has a flange interface 6 at one end near the liquid crystal waveplate 1, and the other end of the flange interface 6 is connected to an optical fiber 7.

[0015] Furthermore, the model number of the liquid crystal wave plate 1 is: LCC1318-A.

[0016] The beneficial effects of this invention are as follows: By applying different voltages to the liquid crystal waveplate through the voltage output module, the liquid crystal molecules inside the waveplate will align in different directions under different voltages, thereby introducing different phase delays to the spatial light. This eliminates the need to adjust the optical axis direction of multiple polarizers during the experiment, allowing for rapid and precise adjustment of the polarization state, and improving the convenience and accuracy of the adjustment operation. The adjustable polarization collimator provided by this invention eliminates the need for multiple polarizers, reducing the number of components involved in the optical path and improving the stability of the optical path. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly described below. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an adjustable polarization collimator suitable for an atomic gravimeter, provided by an embodiment of this utility model; Figure 2 This is a schematic diagram of a flange interface and optical fiber provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of a liquid crystal waveplate provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the liquid crystal molecule alignment direction provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the liquid crystal molecule alignment direction provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure of a housing and voltage output module provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of a circuit board provided in an embodiment of the present invention; Figure 8 This is a circuit diagram of a voltage output module provided in an embodiment of the present invention; Figure 9 This is a circuit diagram of a heating film control module provided in an embodiment of the present invention; Figure 10 This is a circuit diagram of a temperature acquisition module provided in an embodiment of the present invention.

[0019] The reference numerals in the accompanying drawings are: 1. Liquid crystal waveplate, 10. Transparent conductive film, 11. Liquid crystal sheet, 12. Alignment film, 13. Antireflective film, 2. Waveplate, 3. Control component, 30. Voltage output module, 300. First signal line group, 31. Circuit board, 32. Heating film control module, 33. Temperature acquisition module, 34. Microcontroller, 4. Housing, 5. Lens, 6. Flange interface, 7. Optical fiber. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 merely illustrative of the present utility model and are not intended to limit the present utility model.

[0021] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as openly inclusive, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," "specific example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples; that is, although they may be incorporated into embodiments or examples using the above terms for reasons such as order and position, it does not limit them to be incorporated in combination by a single embodiment or example.

[0022] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more. Furthermore, for example, the description may use the prefix "A" or "B" to describe the same type of nouns as two independent entities. In this case, the features defined with "A" and "B" are used only to distinguish between similar entities and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0023] In describing some embodiments, the terms "coupled," "coupled," and "connected," and their derivative expressions, may be used. For example, the term "connected" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact with each other. Similarly, the term "coupled" may be used in describing some embodiments to indicate that two or more components have direct physical or electrical contact. However, the terms "connected" or "coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other, such as "optical coupling" or "wireless connection." The embodiments disclosed herein are not necessarily limited to the scope of this invention.

[0024] Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0025] Example 1: The polarization state of the laser is crucial to the measurement results of an atomic gravimeter. Current techniques typically employ a polarizer-based optical path adjustment scheme at the collimator output to adjust the laser incident on the atomic gravimeter. To overcome the inflexible and cumbersome polarization state adjustment limitations of existing techniques, please refer to... Figure 1 Embodiment 1 of this utility model provides an adjustable polarization collimator suitable for an atomic gravimeter, including a liquid crystal waveplate 1 and a waveplate 2 disposed inside the adjustable polarization collimator; the liquid crystal waveplate 1 is connected to a voltage output module 30, which is used to apply different voltages to the liquid crystal waveplate 1; the adjustable polarization collimator receives spatial light, and the liquid crystal waveplate 1 is used to introduce different phase delays to the spatial light under different voltages to adjust the polarization direction of the spatial light; the waveplate 2 is used to further adjust the polarization direction of the spatial light.

[0026] Existing collimating lens optical paths generally include a flange and a plano-convex lens for collimating spatial light, while polarizers are placed outside the collimator to adjust the polarization state of the spatial light. This embodiment improves upon the existing collimating lens optical path by sequentially introducing a liquid crystal waveplate 1 and a waveplate 2 into the optical path inside the collimator, forming a tunable polarization state conversion module. Different voltages are applied to the liquid crystal waveplates through a voltage output module. Under different voltages, the liquid crystal molecules inside the liquid crystal waveplate 1 align in different directions, introducing different phase delays to the spatial light. This eliminates the need to adjust the optical axis direction of multiple polarizers during experiments, allowing for rapid and precise adjustment of the polarization state, and improving the convenience and accuracy of the adjustment operation. The tunable polarization collimating lens provided by this invention eliminates the need for multiple polarizers, reducing the number of components involved in the optical path and improving its stability.

[0027] Specifically, the liquid crystal waveplate 1 adjusts the polarization direction of the incident spatial light by introducing a phase delay. In practical applications, the minimum delay introduced by the liquid crystal waveplate 1 is about 30nm, which can roughly achieve spatial light output in various polarization states. In order to ensure that the adjustable polarization collimator can output spatial light in various polarization states, a waveplate 2 is provided along the optical path propagation direction of the liquid crystal waveplate 1. In one embodiment, the waveplate 2 is set as a quarter-waveplate. The waveplate 2 can further adjust the polarization direction of the spatial light, so that the adjustable polarization collimator can accurately output the required polarization state of the spatial light. Furthermore, by integrating the liquid crystal waveplate 1 and the waveplate 2 into the adjustable polarization collimator, an integrated structure is formed, which improves the overall stability of the structure.

[0028] Furthermore, the phase delay of the liquid crystal waveplate 1 selected in this embodiment mainly occurs under the condition that the input voltage is 1-10V. Therefore, when the voltage changes between 1-10V, it can change the polarization state of the output of the adjustable polarization collimator. In actual use, when the input voltage changes from 1.51V to 2.83V, the polarization of the output light changes from vertical linear polarization to left-hand circular polarization, indicating that the output polarization can be changed by the adjustable polarization collimator.

[0029] To enable the collimator to receive spatial light, see [reference needed]. Figure 2 The arrow in the figure indicates the direction of spatial light propagation. The adjustable polarization collimator has a flange interface 6 at one end near the liquid crystal waveplate 1, and the other end of the flange interface 6 is connected to an optical fiber 7.

[0030] In practical applications, it is necessary to convert laser light into spatial light for spatial operations. In order to enable the laser light to be incident on the adjustable polarization collimator in the form of spatial light, in one embodiment, one end of the optical fiber 7 is connected to the laser and the other end is connected to the flange interface 6. The optical fiber 7 transmits the laser light emitted from the laser to the flange interface 6, and the flange interface 6 converts the laser light into spatial light and incident on the liquid crystal waveplate 1.

[0031] To achieve polarization state tuning, see [link / reference]. Figure 3 The liquid crystal waveplate 1 includes a transparent liquid crystal cell, and the interior of the liquid crystal cell is filled with a liquid crystal molecule solution to form the liquid crystal waveplate 1; applying different voltages to the liquid crystal waveplate 1 can change the alignment direction of the liquid crystal molecules, thereby changing the phase delay introduced by the liquid crystal waveplate 1.

[0032] The liquid crystal cell includes two interleaved liquid crystal sheets 11. An alignment film 12 is deposited on the surface of the two liquid crystal sheets 11 that are close to each other. Liquid crystal molecules are accommodated between the two alignment films 12. Due to the birefringence of the liquid crystal molecules, the liquid crystal waveplate 1 can be used as an optical anisotropic waveplate to adjust the polarization state of the laser. When the laser is incident on the liquid crystal waveplate 1, its polarized light is decomposed into two mutually perpendicular linearly polarized components. Since the refractive indices of the two linearly polarized components are different, there is a phase difference between the two linearly polarized lights to achieve phase delay. In actual use, the model of the liquid crystal waveplate 1 is: LCC1318-A.

[0033] In one embodiment, see Figure 4 If no voltage is applied to the liquid crystal waveplate 1, the alignment direction of the liquid crystal molecules is determined by the alignment film 12. In actual use, the alignment film 12 is composed of an organic polyimide film layer, and the molecules of the alignment film are aligned along the friction direction during manufacturing.

[0034] In another embodiment, see Figure 5If a voltage is applied to the liquid crystal waveplate 1, the liquid crystal molecules will deflect according to the direction of the electric field. The greater the applied voltage, the smaller the phase difference between the two linearly polarized lights, thereby changing the deflection angle of the liquid crystal molecules and further changing the phase delay introduced by the liquid crystal waveplate 1.

[0035] To improve the stability of the optical path, please refer to [further details]. Figure 3 The liquid crystal cell is coated with an anti-reflection film 13, which can be used to improve the transmittance of spatial light. In actual use, the anti-reflection film 13 of different wavelength ranges can be selected according to the laser wavelength emitted by the laser. In one embodiment, if the laser wavelength emitted by the laser is 780nm, an anti-reflection film 13 in the range of 650nm to 1050nm can be coated on two opposite surfaces of the liquid crystal cell (along the direction of the laser light path) so that the spatial light can pass through the liquid crystal waveplate 1 to the maximum extent without reflection or scattering, thus avoiding loss that affects the stability of the light path.

[0036] To achieve voltage regulation, please refer to [further details]. Figure 3 A transparent conductive film 10 is deposited on two opposite parallel surfaces of the liquid crystal waveplate 1. The transparent conductive film 10 is used to apply voltage to the liquid crystal waveplate 1.

[0037] In one embodiment, a transparent conductive film 10 is deposited between the alignment film 12 and the liquid crystal panel 11. The transparent conductive film 10 has a larger coverage area than the alignment film 12, allowing the transparent conductive film 10 to be partially exposed for connection to the voltage output module 30 (e.g., ...). Figure 1 As shown in the figure, in practical applications, the transparent conductive film 10 can be configured as a high-resistivity indium tin oxide conductive layer. The transparent conductive film 10 is connected to the voltage output module 30 by wires. The voltage output module 30 transmits voltage signals to change the voltage applied to the transparent conductive film 10.

[0038] To reduce spatial light divergence loss, see [reference] Figure 6 The adjustable polarization collimator also includes a lens 5, which is arranged along the optical path propagation direction of the waveplate 2 and is used to collimate and shape the spatial light after the polarization state is adjusted. In one embodiment, the lens 5 is a plano-convex mirror. The spatial light passes through the waveplate 2 and is incident on the convex surface of the lens 5, and is collimated into parallel light before continuing to exit, so that the spatial light output by the adjustable polarization collimator is collimated parallel light and has high light spot uniformity.

[0039] In one embodiment, after the adjustable polarization collimator is installed, it is calibrated once. Specifically, the polarization analyzer is placed at the optical path output end; the liquid crystal waveplate 1 is driven by the control component 3, and the voltage applied to the liquid crystal waveplate 1 is slowly scanned; the voltage values ​​corresponding to the various polarization states are recorded and recorded, and the optical power meter is used for testing to ensure that the output polarization state and light intensity are stable and match the measurement requirements of the atomic gravimeter.

[0040] The control component 3 is configured as a computer, and the voltage output module 30 is mounted on a circuit board 31. Other functional modules are also mounted on the circuit board. The computer is connected to a communication interface on the circuit board 31 to enable the voltage output module 30 to output a corresponding voltage based on user commands. The voltage output module 30 then transmits the voltage to the liquid crystal waveplate 1. For details, please refer to... Figure 6 and Figure 7 The voltage output module 30 is connected to the two transparent conductive films 10 through a first signal line group 300. The first signal line group 300 includes a positive signal line and a negative signal line. The negative signal line is connected to one of the transparent conductive films 10, and the positive signal line is connected to the other transparent conductive film 10, so as to output a corresponding voltage to the liquid crystal waveplate 1.

[0041] Specifically, the liquid crystal waveplate 1 is disposed inside the housing 4, and the housing 4 has a cable outlet for accommodating and fixing the first signal line group 300. One end of the positive signal line is soldered to the exposed portion of the transparent conductive film 10 therein, and one end of the negative signal line is soldered to the exposed portion of another transparent conductive film 10. The other ends of both the positive and negative signal lines are soldered to the voltage output module 30 to achieve signal transmission, enabling the control component 3 to adjust the voltage of the liquid crystal waveplate 1. In practical applications, the circuit diagram of the voltage output module 30 is as follows: Figure 8 As shown, DRIVER1 is the voltage output terminal, that is, the other end of the positive signal line is connected to the voltage output terminal DRIVER1.

[0042] In another embodiment, to apply voltage to the transparent conductive film 10, the voltage output module 30 can also be a signal generator connected to two of the transparent conductive films 10 via signal lines. The signal lines include a positive signal line and a negative signal line; the negative signal line is connected to one of the transparent conductive films 10, and the positive signal line is connected to the other transparent conductive film 10, to output a corresponding voltage to the liquid crystal waveplate 1. In this case, the control component 3 can be omitted.

[0043] In one embodiment, the liquid crystal waveplate 1 is disposed inside a conventional housing. When the ambient temperature during the operation of the adjustable polarization collimator changes, the liquid crystal waveplate 1 is affected by the temperature and has difficulty maintaining the stability of the output polarization.

[0044] Under the same voltage, the phase delay introduced by the liquid crystal waveplate 1 changes with temperature. Therefore, it is necessary to install a temperature control component on the housing 4 to maintain the stability of the output polarization. In a preferred embodiment, see [link to preferred embodiment]. Figure 6 The liquid crystal waveplate 1 is disposed inside the housing 4. The temperature control component can keep the temperature inside the housing 4 constant, so that the temperature of the liquid crystal waveplate 1 is constant to maintain the stability of the output polarization. Thus, the liquid crystal waveplate 1 can provide a constant phase delay even when the ambient temperature changes, ensuring the stability of the output polarization.

[0045] Furthermore, in one embodiment, the temperature control component includes a semiconductor cooler, which can be driven by the control component 3 to adjust the housing 4 to a preset operating temperature.

[0046] In another embodiment, the outer wall of the housing 4 is covered with a heating film for temperature regulation, and a thermistor is disposed inside the housing 4. Specifically, see [reference needed]. Figure 7 The circuit board 31 is equipped with a heating film control module 32. This module drives the heating film to convert electrical energy into heat energy, thereby maintaining a constant temperature for the outer casing 4. In practical applications, the circuit diagram of the heating film control module 32 is shown below. Figure 9 As shown, TP is the positive voltage output terminal, and TN is the negative voltage output terminal. TP and TN are connected to the two ends of the heating film via signal lines. The circuit board 31 also includes a temperature acquisition module 33, which acquires the real-time temperature of the thermistor and feeds it back to the microcontroller 34. The microcontroller 34 controls the heating film control module 32 to further adjust the heat generated by the heating film. In practical applications, the circuit diagram of the temperature acquisition module 33 is shown below. Figure 10 As shown, NTCP and NTCN are connected to the two ends of the thermistor.

[0047] When the atomic gravimeter is in normal working condition, after the temperature control of the liquid crystal waveplate 1 by the outer shell 4 is stable, the control component 3 issues a command to drive the voltage output module 30 to adjust the voltage of the liquid crystal waveplate 1 to the voltage corresponding to circular polarization. The adjustable polarization collimator outputs circularly polarized light, which interacts optimally with the atoms.

[0048] Furthermore, depending on the actual usage scenario, the control component 3 can also issue instructions to drive the voltage output module 30 to adjust the voltage of the liquid crystal waveplate 1 to the voltage corresponding to linear polarization, so that the adjustable polarization collimator outputs linearly polarized light.

[0049] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adjustable polarization collimator suitable for atomic gravimeters, characterized in that, Includes a liquid crystal waveplate (1) and a waveplate (2) disposed inside the adjustable polarization collimator. The liquid crystal waveplate (1) is connected to the voltage output module (30). The voltage output module (30) is used to apply different voltages to the liquid crystal waveplate (1). The adjustable polarization collimator receives spatial light. The liquid crystal waveplate (1) is used to introduce different phase delays to the spatial light under different voltages in order to adjust the polarization direction of the spatial light. The waveplate (2) is used to further adjust the polarization direction of the spatial light.

2. The adjustable polarization collimator for an atomic gravimeter according to claim 1, characterized in that, The liquid crystal waveplate (1) includes a transparent liquid crystal cell, and the interior of the liquid crystal cell is filled with a liquid crystal molecule solution to form the liquid crystal waveplate (1). Applying different voltages to the liquid crystal waveplate (1) can change the alignment direction of the liquid crystal molecules, thereby changing the phase delay introduced by the liquid crystal waveplate (1).

3. The adjustable polarization collimator for an atomic gravimeter according to claim 2, characterized in that, The liquid crystal cell is coated with an anti-reflection film (13), which can be used to improve the transmittance of spatial light.

4. The adjustable polarization collimator for an atomic gravimeter according to claim 1, characterized in that, The liquid crystal waveplate (1) has a transparent conductive film (10) deposited on two opposite parallel surfaces. The transparent conductive film (10) is used to apply voltage to the liquid crystal waveplate (1).

5. The adjustable polarization collimator for an atomic gravimeter according to claim 4, characterized in that, The voltage output module (30) is connected to the two transparent conductive films (10) through the first signal line group (300); The first signal line group (300) includes a positive signal line and a negative signal line. The negative signal line is connected to one of the transparent conductive films (10), and the positive signal line is connected to the other transparent conductive film (10) to output a corresponding voltage to the liquid crystal waveplate (1).

6. The adjustable polarization collimator for an atomic gravimeter according to claim 1, characterized in that, The liquid crystal wave plate (1) is disposed inside the outer casing (4).

7. The adjustable polarization collimator for an atomic gravimeter according to claim 6, characterized in that, The outer wall of the outer shell (4) is covered with a heating film for temperature regulation, and a thermistor is provided inside the outer shell (4).

8. The adjustable polarization collimator for an atomic gravimeter according to claim 1, characterized in that, The adjustable polarization collimator also includes a lens (5), which is arranged along the optical path propagation direction of the waveplate (2) and is used to collimate and shape the spatial light after the polarization state is adjusted.

9. The adjustable polarization collimator for an atomic gravimeter according to claim 1, characterized in that, The adjustable polarization collimator has a flange interface (6) at one end near the liquid crystal waveplate (1), and an optical fiber (7) is connected to the other end of the flange interface (6).

10. The adjustable polarization collimator for an atomic gravimeter according to claim 1, characterized in that, The model number of the liquid crystal wave plate (1) is LCC1318-A.

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