Method for operating a double cell optical frequency atomic clock, optical frequency atomic clock and electronic device

Abstract

The application provides a double-layer gas chamber optical frequency atomic clock operation method, an optical frequency atomic clock and an electronic device. A laser is controlled to emit first laser with a first parameter to the double-layer gas chamber, wherein the first laser is used to generate first modulation detection light corresponding to the first laser by generating a nonlinear effect with atoms in the double-layer gas chamber. The first modulation detection light is received by a photoelectric detector and converted into an initial electric signal. According to the initial electric signal, the laser is controlled to emit second laser with a second parameter. The second laser is laser with a stable frequency locked based on the initial electric signal. Atomic clock time frequency information is obtained based on the second laser. The atomic clock time frequency information represents the transition frequency of the atoms output by the double-layer gas chamber optical frequency atomic clock. The problem that the atomic spectral line drift of the optical frequency atomic clock and the long-term stability of the frequency are difficult to improve is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of atomic clocks, and particularly to a double-layer gas chamber optical frequency atomic clock operation method, an optical frequency atomic clock and an electronic device. BACKGROUND

[0002] Atomic clocks are currently the most accurate and stable time-frequency measurement tools, which are widely used in basic scientific fields such as precision measurement and metrology science, global navigation and positioning system, etc. The atomic clocks generate an oscillation signal through a local oscillator, take an atomic transition frequency as a quantum reference, and can lock the frequency of the local oscillator on the atomic transition spectral line through a servo feedback circuit.

[0003] The transition frequency referenced by the optical frequency atomic clock is 4 to 5 orders of magnitude higher than that of the microwave atomic clock, and the expected frequency stability is higher than that of the microwave atomic clock. The stability of the optical frequency atomic clock has entered the order of 1E-19. At present, the optical frequency atomic clock is usually built through a single-layer atomic gas chamber, so as to obtain the transition frequency of the atom.

[0004] However, the optical frequency atomic clock built through the single-layer atomic gas chamber has the problems of atomic spectral line drift and difficulty in improving long-term frequency stability. SUMMARY

[0005] The present application provides a double-layer gas chamber optical frequency atomic clock operation method, an optical frequency atomic clock and an electronic device, to solve the problems of atomic spectral line drift and difficulty in improving long-term frequency stability of the optical frequency atomic clock.

[0006] In a first aspect, the present application provides a double-layer gas chamber optical frequency atomic clock operation method applied to a double-layer gas chamber optical frequency atomic clock, the double-layer gas chamber optical frequency atomic clock comprising a laser, a double-layer gas chamber and a photodetector, the double-layer gas chamber storing atoms, and the method comprising: controlling the laser to emit first laser with a first parameter to the double-layer gas chamber, wherein the first laser is used to generate first modulated probe light corresponding to the first laser by generating nonlinear effect with the atoms in the double-layer gas chamber; receiving the first modulated probe light by the photodetector and converting the first modulated probe light into an initial electric signal; controlling the laser to emit second laser with a second parameter according to the initial electric signal, the second laser being laser with stable frequency locked based on the initial electric signal, and obtaining atomic clock time frequency information based on the second laser, the atomic clock time frequency information representing the transition frequency of the atoms output by the double-layer gas chamber optical frequency atomic clock.

[0007] In a possible implementation, the double-layer gas chamber includes an inner layer gas chamber, and the method further includes: obtaining first temperature information, the first temperature information representing a real-time temperature value of the inner layer gas chamber; obtaining control temperature information according to the first temperature information and second temperature information, the second temperature information representing a preset temperature variation range of the inner layer gas chamber; and controlling the temperature value of the inner layer gas chamber to be within the temperature variation range according to the control temperature information.

[0008] In a possible implementation, the double-layer gas chamber optical frequency atomic clock further includes a servo feedback circuit, and the controlling, according to the initial electrical signal, the laser to emit second laser with the second parameter includes: controlling, according to the initial electrical signal, the servo feedback circuit to output an error signal, the error signal being an electrical signal obtained by mixing and demodulating the initial electrical signal and a reference signal, the reference signal being an electrical signal with the same frequency as a driving signal of the electro-optical modulator; and controlling, according to the error signal, the laser to emit second laser with the second parameter.

[0009] In a possible implementation, the servo feedback circuit includes a low-pass filter unit, an amplification unit, a mixing unit and a radio frequency unit, and the controlling, according to the initial electrical signal, the servo feedback circuit to output an error signal includes: controlling the low-pass filter unit to filter noise of the initial electrical signal to obtain a noise-reduced electrical signal; controlling the amplification unit to amplify the noise-reduced electrical signal to obtain an amplified electrical signal; and controlling the radio frequency unit and the mixing unit to mix and demodulate the amplified electrical signal and the reference signal to obtain the error signal.

[0010] In a possible implementation, the servo feedback circuit further includes a proportional-integral-derivative controller unit, and the controlling, according to the error signal, the laser to emit second laser with the second parameter includes: controlling the proportional-integral-derivative controller to obtain a control signal according to the error signal, the control signal being used to adjust an output frequency and / or an output power of the laser; and controlling the laser to emit second laser with the second parameter according to the control signal.

[0011] In a possible implementation, the atom includes cesium atom or rubidium atom.

[0012] In a second aspect, the present application provides a double-layer gas chamber optical frequency atomic clock, including: a laser, a double-layer gas chamber, and a photodetector, the double-layer gas chamber storing atoms.

[0013] The double-layer gas chamber optical frequency atomic clock is used to implement the double-layer gas chamber optical frequency atomic clock operation method according to any one of the first aspect of the embodiments of the present application.

[0014] In a possible implementation, the double-layer gas chamber comprises an outer layer gas chamber, an inner layer gas chamber and a heating unit; the outer layer gas chamber is provided with a first cold finger, the inner layer gas chamber is provided with a second cold finger, the first cold finger is used for pumping to achieve a vacuum environment inside the outer layer gas chamber, and the second cold finger is used for placing atoms into the inner layer gas chamber; the inner layer gas chamber and the heating unit are arranged inside the outer layer gas chamber; the heating unit is arranged outside the inner layer gas chamber; the heating unit comprises a base, a heating wire and a temperature sensor; the heating wire is fixed in the base through first recess structure of the base; and the temperature sensor is fixed in the base through second recess structure of the base.

[0015] In a possible implementation, the heating unit is arranged outside the inner layer gas chamber, and comprises: fixing the heating unit outside the inner layer gas chamber through at least one rectangular frame.

[0016] In a third aspect, the present application provides an electronic device, comprising: a processor, and a memory connected with the processor in communication;

[0017] The memory stores computer execution instructions.

[0018] The processor executes the computer execution instructions stored in the memory, to implement the double-layer gas chamber optical frequency atomic clock operation method according to any one of the first aspect of the embodiments of the present application.

[0019] In a fourth aspect, the present application provides a computer readable storage medium, wherein the computer readable storage medium stores computer execution instructions, and the computer execution instructions are executed by a processor to implement the double-layer gas chamber optical frequency atomic clock operation method according to any one of the first aspect of the embodiments of the present application.

[0020] According to a fifth aspect of the embodiments of the present application, the present application provides a computer program product, comprising a computer program, which is executed by a processor to implement the double-layer gas chamber optical frequency atomic clock operation method according to any one of the first aspect.

[0021] The method, clock, and electronic device for operating a double-layered gas chamber optical frequency atomic clock provided in this application are applied to a double-layered gas chamber optical frequency atomic clock. The double-layered gas chamber optical frequency atomic clock includes a laser, a double-layered gas chamber, and a photodetector. Atoms are stored in the double-layered gas chamber. The laser is controlled to emit a first laser beam into the double-layered gas chamber with a first parameter. The first laser beam interacts nonlinearly with the atoms in the double-layered gas chamber to generate a first modulated probe beam corresponding to the first laser beam. The photodetector receives the first modulated probe beam and converts it into an initial electrical signal. Based on the initial electrical signal, the laser is controlled to emit a second laser beam with a second parameter. The second laser beam is a laser beam with a stable frequency locked based on the initial electrical signal. Based on the second laser beam, atomic clock time and frequency information is obtained. This atomic clock time and frequency information characterizes the transition frequencies of the atoms output by the double-layered gas chamber optical frequency atomic clock. By controlling the laser to emit laser light according to the first parameter to obtain the initial electrical signal, and then processing the first parameter to obtain the second parameter, which is equivalent to optimizing the first parameter, the laser is then controlled to emit a second laser light according to the second parameter to obtain the time and frequency information output by the double-layer gas chamber optical frequency atomic clock. This solves the problems of atomic spectral line drift and difficulty in improving the long-term frequency stability of optical frequency atomic clocks. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0023] Figure 1 This is an application scenario diagram of the dual-layer gas chamber optical frequency atomic clock operation method provided in the embodiments of this application;

[0024] Figure 2 A flowchart illustrating a method for operating a dual-cell optical frequency atomic clock according to an embodiment of this application;

[0025] Figure 3 A schematic diagram illustrating the specific steps for controlling the temperature of the inner air chamber provided in an embodiment of this application;

[0026] Figure 4 A flowchart illustrating a method for operating a dual-cell optical frequency atomic clock, as provided in another embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the structure of a double-layer gas-cell optical frequency atomic clock provided in one embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the structure of the double-layered air chamber provided in an embodiment of this application;

[0029] Figure 7A structural schematic diagram of a heating unit provided for an embodiment of the present application;

[0030] Figure 8 A connection schematic diagram of a heating unit and an inner gas chamber provided for an embodiment of the present application;

[0031] Figure 9 A specific structural schematic diagram of a double-layer gas chamber optical frequency atomic clock based on a modulation transfer spectrum principle provided for an embodiment of the present application;

[0032] Figure 10 A schematic diagram of an electronic device provided for an embodiment of the present application;

[0033] Figure 11 A block diagram of a terminal device shown in an exemplary embodiment of the present application.

[0034] Explanation of reference numerals:

[0035] 1 - double-layer gas chamber;

[0036] 11 - outer gas chamber;

[0037] 111 - first cold finger;

[0038] 12 - inner gas chamber;

[0039] 121 - second cold finger;

[0040] 13 - heating unit;

[0041] 131 - base;

[0042] 132 - heating wire;

[0043] 133 - temperature sensor;

[0044] 14 - rectangular frame;

[0045] 2 - double-layer gas chamber optical frequency atomic clock;

[0046] 21 - laser;

[0047] 22 - double-layer gas chamber;

[0048] 23 - photodetector;

[0049] 24 - laser beam splitter;

[0050] 25 - electro-optical modulator;

[0051] 26 - servo feedback circuit;

[0052] 27 - controller;

[0053] 28 - polarization beam splitter prism;

[0054] 29 - signal source.

[0055] The present application has been shown and described with reference to the preferred embodiments. Equivalent mechanisms and methods incorporating one or more of the novel aspects of the application are intended to be within the scope of the application. Moreover, although the description has included description of one or more embodiments, from the nature of the application other embodiments can be derived out by a person skilled in the art without departing from the spirit of the application. Accordingly, the scope of the application is not intended to be limited to the specific embodiments described herein. Rather, it is to be determined by the following claims, which are to be interpreted in the light of the preceding description and illustrative examples. DETAILED DESCRIPTION

[0056] The exemplary embodiments will be described in detail with reference to the drawings. In the following description, like numbers refer to like elements throughout the description. The following examples are illustrative of the embodiments of the present application and are not intended to limit the scope of the application. Rather, they are intended to express the general principles of the application and the novel features thereof.

[0057] Atomic clocks are currently the most accurate and stable time and frequency measurement tools, which are widely used in the fields of precision measurement and metrology science, global navigation and positioning system, etc. The atomic clock generates an oscillation signal through a local oscillator, takes the atomic transition frequency as a quantum reference, and can lock the frequency of the local oscillator on the atomic transition spectrum line through a servo feedback circuit. The transition frequency of the optical frequency atomic clock is 4 to 5 orders of magnitude higher than that of the microwave atomic clock, and the expected frequency stability is higher than that of the microwave atomic clock. The stability of the optical frequency atomic clock has entered the order of 1E-19. At present, the optical frequency atomic clock is usually built by a single-layer atomic cell, so as to obtain the atomic transition frequency. However, the optical frequency atomic clock built by the single-layer atomic cell has the problem that the atomic thermal motion in the cell is caused by the influence of the temperature change of the external environment on the temperature in the cell, which causes the parameters of the laser used in controlling the laser to be inaccurate, and further causes the atomic spectral line of the optical frequency atomic clock to drift and the long-term stability of the frequency to be difficult to improve.

[0058] Figure 1 An application scenario diagram of the double-layer cell optical frequency atomic clock operation method provided by the embodiments of the present application, the double-layer cell optical frequency atomic clock operation method provided by the embodiments of the present application can be applied to the scenario of optical frequency atomic clock operation, for example, Figure 1As shown, the double-layer gas chamber optical frequency atomic clock comprises a laser, a double-layer gas chamber, and a photoelectric detector. The laser is controlled to emit first laser with a first parameter to the double-layer gas chamber. The first laser interacts with atoms in the double-layer gas chamber, and then generates first modulated probe light corresponding to the first laser when the atoms transition from a high-energy level state to a low-energy level state. The first modulated probe light is an optical signal carrying the oscillation transition frequency of the atoms. Then, the photoelectric detector receives the first modulated probe light and converts the first modulated probe light into an initial electrical signal. The first parameter is processed according to the initial electrical signal to obtain a second parameter, and then the laser is controlled to emit second laser with the second parameter. The atomic clock time frequency information is obtained according to the second laser. The laser is controlled to emit laser according to the first parameter to obtain the initial electrical signal, and then the first parameter is processed to obtain the second parameter. The second parameter is equivalent to optimizing the first parameter, and then the laser is controlled to emit second laser according to the second parameter, so that the time information corresponding to the optical frequency atomic clock is obtained, that is, the problems of atomic spectral line drift and long-term frequency stability of the optical frequency atomic clock are solved.

[0059] The technical solutions of the present application and how the technical solutions solve the above technical problems will be described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of the present application will be described below with reference to the drawings.

[0060] Figure 2 A flow chart of a double-layer gas chamber optical frequency atomic clock operation method is provided for an embodiment of the present application. The double-layer gas chamber optical frequency atomic clock operation method is applied to a double-layer gas chamber optical frequency atomic clock. The double-layer gas chamber optical frequency atomic clock comprises a laser, a double-layer gas chamber, and a photoelectric detector. Atoms are stored in the double-layer gas chamber. The atoms include cesium atoms or rubidium atoms, such as Figure 2 As shown, the double-layer gas chamber optical frequency atomic clock operation method provided by the embodiment comprises the following steps:

[0061] In step S101, the laser is controlled to emit first laser with a first parameter to the double-layer gas chamber. The first laser is used to generate first modulated probe light corresponding to the first laser by interacting with atoms in the double-layer gas chamber.

[0062] Exemplarily, the execution subject of the operation method of the double-layer gas chamber optical frequency atomic clock provided in the embodiments of the present application can be the double-layer gas chamber optical frequency atomic clock, or a controller in the double-layer gas chamber optical frequency atomic clock, or a device with similar functions, wherein the first laser is used to generate a first modulation probe light corresponding to the first laser by generating a nonlinear effect with atoms in the double-layer gas chamber, and more specifically, the nonlinear effect is a nonlinear four-wave mixing effect; the first parameters include a laser wavelength, a laser power, a laser mode, and a laser frequency stability, and the controller controls the laser to operate according to the first parameters, so as to emit the first laser to the double-layer gas chamber, and then generate the first modulation probe light corresponding to the first laser by generating the nonlinear effect with the atoms in the double-layer gas chamber through the first laser.

[0063] In step S102, the first modulation probe light is received by the photodetector, and the first modulation probe light is converted into an initial electrical signal.

[0064] Exemplarily, after the photodetector receives the first modulation probe light, the photodetector can convert the optical signal into the electrical signal, that is, convert the first modulation probe light into the initial electrical signal, wherein the first modulation probe light corresponds to the first modulation probe light in the application scenario shown in the figure. The specific working principle of the photodetector will not be described here. Figure 1

[0065] In step S103, the second laser with a stable frequency locked based on the initial electrical signal is emitted by the laser according to the second parameters, and the atomic clock time frequency information is obtained based on the second laser, and the atomic clock time frequency information represents the transition frequency of the atom output by the double-layer gas chamber optical frequency atomic clock.

[0066] Exemplarily, the second laser with a stable frequency locked based on the initial electrical signal is emitted by the laser according to the second parameters, and the atomic clock time frequency information is obtained based on the second laser, and the atomic clock time frequency information represents the transition frequency of the atom output by the double-layer gas chamber optical frequency atomic clock.

[0067] Further, the double-layer gas chamber includes an inner layer gas chamber, and the atoms are stored in the inner layer gas chamber of the double-layer gas chamber, and when the nonlinear effect is generated by the first laser with the atoms in the double-layer gas chamber, the temperature of the inner layer gas chamber of the double-layer gas chamber needs to be stabilized; Figure 3 The specific steps of controlling the temperature of the inner layer gas chamber provided in the embodiments of the present application are shown in FIG. 5, and the specific steps of controlling the temperature of the inner layer gas chamber include: Figure 3 ​​

[0068] In step S1001, first temperature information is acquired, which represents a real-time temperature value of the inner air chamber.

[0069] In step S1002, control temperature information is obtained according to the first temperature information and second temperature information, which represents a preset temperature variation range of the inner air chamber.

[0070] In step S1003, the temperature value of the inner air chamber is controlled within the temperature variation range according to the control temperature information.

[0071] Exemplarily, the first temperature information represents the real-time temperature value of the inner air chamber, and the second temperature information represents the preset temperature variation range of the inner air chamber. On the basis of acquiring the real-time temperature value of the inner air chamber by the temperature sensor, whether the temperature value of the inner air chamber needs to be adjusted is determined by comparing the real-time temperature value of the inner air chamber with the preset temperature variation range of the inner air chamber, that is, the control temperature information is obtained, and then the temperature value of the inner air chamber is controlled within the preset temperature variation range according to the control temperature information. In a possible implementation manner, the real-time temperature value of the inner air chamber is temp_1, the preset temperature variation range is temp_2 to temp_3, if the real-time temperature value temp_1 is less than temp_2, the control temperature information is to increase the temperature value of the inner air chamber, and then the inner air chamber is heated according to the control temperature information, so that the temperature value of the inner air chamber is within the temperature variation range.

[0072] In the step of the embodiment, the double-layer air chamber is introduced instead of the single-layer air chamber, and the real-time temperature value of the inner air chamber is monitored, so that the temperature value of the inner air chamber is controlled within the preset temperature variation range, which avoids the temperature of the inner air chamber of the double-layer air chamber from being affected by the temperature change of the external environment of the double-layer air chamber, so that the temperature of the inner air chamber does not fluctuate sharply, and the problem of frequency drift caused by atomic thermal motion in the double-layer air chamber is solved. Further, on the basis of solving the problem of frequency drift caused by atomic thermal motion in the double-layer air chamber, the first parameter is accurately processed and optimized to obtain the second parameter.

[0073] In the embodiment, the laser is controlled to emit first laser with first parameters to the double-layer gas chamber, wherein the first laser is used to generate nonlinear effect with atoms in the double-layer gas chamber to generate first modulation detection light corresponding to the first laser; the first modulation detection light is received by the photoelectric detector and converted into an initial electrical signal; according to the initial electrical signal, the laser is controlled to emit second laser with second parameters, the second laser is laser with stable frequency locked based on the initial electrical signal, and atomic clock time frequency information is obtained based on the second laser, the atomic clock time frequency information represents the transition frequency of the atoms output by the double-layer gas chamber optical frequency atomic clock. The initial electrical signal is obtained by controlling the laser to emit laser according to the first parameters, and then the first parameters are processed to obtain the second parameters, which is equivalent to optimizing the first parameters, and then the laser is controlled to emit the second laser according to the second parameters to obtain the time frequency information output by the double-layer gas chamber optical frequency atomic clock, thereby solving the problem of low time accuracy of the optical frequency atomic clock caused by spectral line drift and low long-term stability of the frequency of the atoms.

[0074] Figure 4 The flow chart of the operation method of the double-layer gas chamber optical frequency atomic clock provided for another embodiment of the present application is shown in Figure 4 The operation method of the double-layer gas chamber optical frequency atomic clock provided in the embodiment is based on the operation method of the double-layer gas chamber optical frequency atomic clock provided in the embodiment shown in Figure 2 The operation method of the double-layer gas chamber optical frequency atomic clock provided in the embodiment is based on the operation method of the double-layer gas chamber optical frequency atomic clock provided in the embodiment shown in

[0075] Step S201, controlling a laser to emit first laser with first parameters to a double-layer gas chamber, wherein the first laser is used to generate nonlinear effect with atoms in the double-layer gas chamber to generate first modulation detection light corresponding to the first laser.

[0076] Step S202, receiving the first modulation detection light by a photoelectric detector and converting the first modulation detection light into an initial electrical signal.

[0077] Step S203, according to the initial electrical signal, controlling a servo feedback circuit to output an error signal, the error signal being an electrical signal obtained by mixing and demodulating the initial electrical signal and a reference signal, and the reference signal being an electrical signal with the same frequency as the driving signal of the electro-optical modulator.

[0078] For example, the error signal is an electrical signal obtained by mixing and demodulating the initial electrical signal and a reference signal, and the reference signal is an electrical signal with the same frequency as the driving signal of the electro-optical modulator, that is, after obtaining the initial electrical signal, the initial electrical signal is processed by the servo feedback circuit, and the processed initial electrical signal is mixed and demodulated with the reference signal, so that the corresponding error signal is obtained, and the error signal is related to the oscillation transition frequency of the atoms.

[0079] In a possible implementation, the servo feedback circuit comprises a low-pass filter unit, an amplification unit, a frequency mixing unit and a radio frequency unit; the low-pass filter unit is controlled to filter noise from the initial electrical signal to obtain a noise-reduced electrical signal; the amplification unit is controlled to amplify the noise-reduced electrical signal to obtain an amplified electrical signal; and the radio frequency unit and the frequency mixing unit are controlled to mix and demodulate the amplified electrical signal and the reference signal to obtain the error signal.

[0080] In step S204, the laser is controlled to emit the second laser with the second parameter according to the error signal.

[0081] For example, the servo feedback circuit further comprises a proportional-integral-derivative control unit, the proportional-integral-derivative control unit is controlled to obtain a control signal according to the error signal, the control signal is used to adjust the output frequency and / or the output power of the laser, and the laser is controlled to emit the second laser with the second parameter according to the control signal. More specifically, for example, the proportional-integral-derivative control unit is controlled to perform operation processing on the error signal to obtain the control signal, the first parameter is further processed according to the control signal to obtain the second parameter, that is, the current of the laser and the length of the piezoelectric ceramic of the laser are adjusted according to the control signal to obtain the second parameter, and the laser is controlled to emit the second laser with the second parameter.

[0082] In this embodiment, the implementation manners of steps S201 and S202 are the same as those of steps S101 and S102 in the embodiment shown in the application, which will not be repeated here. Figure 2

[0083] A structure diagram of the double-layer gas chamber optical frequency atomic clock provided by an embodiment of the application is shown in FIG. 1. Figure 5 As shown in FIG. 1, the double-layer gas chamber optical frequency atomic clock provided by this embodiment comprises a laser, a double-layer gas chamber and a photodetector, and the double-layer gas chamber stores atoms. Figure 5 The double-layer gas chamber optical frequency atomic clock provided by this embodiment can be used to implement the operation method of the double-layer gas chamber optical frequency atomic clock provided by any of the embodiments corresponding to the application. Figures 2-4

[0084] Further, Figure 6 A structure diagram of the double-layer gas chamber provided by an embodiment of the application is shown in FIG. 1. Figure 6 As shown in FIG. 1, the double-layer gas chamber 1 comprises an outer layer gas chamber 11, an inner layer gas chamber 12 and a heating unit 13, the outer layer gas chamber 11 is provided with a first cold finger 111, the inner layer gas chamber 12 is provided with a second cold finger 121, the first cold finger 111 is used to pump air to achieve a vacuum environment inside the outer layer gas chamber 11, and the second cold finger 121 is used to place atoms in the inner layer gas chamber 12; the inner layer gas chamber 12 and the heating unit 13 are arranged inside the outer layer gas chamber 11; and the heating unit 13 is arranged outside the inner layer gas chamber 12.​

[0085] Further, Figure 7 The structure schematic diagram of the heating unit provided by the embodiment of the present application is shown in the figure Figure 7 The heating unit 13 comprises a base 131, a heating wire 132 and a temperature sensor 133; the heating wire 132 is fixed in the base 131 through the first groove structure of the base 131; the temperature sensor 133 is fixed in the base 131 through the second groove structure of the base 131.

[0086] It can be understood that the structure shape of the first groove structure and the structure shape of the second groove structure are not specifically limited in the present application.

[0087] In a possible implementation manner, Figure 8 The connection schematic diagram of the heating unit and the inner layer air chamber provided by the embodiment of the present application is shown in the figure Figure 8 The heating unit 13 is fixed outside the inner layer air chamber 12 through at least one rectangular frame 14; further, the heating unit 13 and the inner layer air chamber 12 are tightly pressed together through the anode bonding mode, so as to improve the heat preservation effect and the heating efficiency of the inner layer air chamber 12, reduce the system energy consumption and improve the operation stability of the double layer air chamber optical frequency atomic clock.

[0088] Further, Figure 9 The specific structure schematic diagram of the double layer air chamber optical frequency atomic clock based on the modulation transfer spectrum principle provided by the embodiment of the present application is shown in the figure Figure 9As shown, the specific structure of the double-layer gas chamber optical frequency atomic clock based on the modulation transfer spectrum principle includes a laser 21, a double-layer gas chamber 22, a photodetector 23, a laser beam splitter 24, an electro-optic modulator 25, a servo feedback circuit 26, and a controller 27, wherein the double-layer gas chamber 22 stores atoms; the temperature value inside the double-layer gas chamber 22 is controlled by the controller 27 to be within a preset temperature variation range, the laser 21 emits first laser according to a first parameter under the control of the controller 27, a polarizing beam splitter 28 divides the first laser into first laser 1 and first laser 2, wherein the first laser 2 is used to directly output the atomic clock time frequency information corresponding to the first laser, and the first laser 1 is input to the laser beam splitter 24, and then the laser beam splitter 24 divides the first laser emitted by the laser 21 into probe light and pump light, the pump light is phase-modulated by the electro-optic modulator 25 according to a modulation signal under the control of the controller 27, and the modulated pump light is obtained, wherein the electro-optic modulator 25 generates a corresponding modulation signal in response to a reference signal emitted by a signal source 29; then, the modulated pump light and the probe light enter the inner layer gas chamber of the double-layer gas chamber 22 through the optical path in opposite directions, and then the modulated pump light, the probe light, and the atoms in the inner layer gas chamber of the double-layer gas chamber 22 generate nonlinear effects, the phase modulation information is transferred to the probe light, and the first modulated probe light is generated, and then the photodetector 23 receives the first modulated probe light and converts the first modulated probe light into an initial electric signal under the control of the controller 27; then, the servo feedback circuit 26 processes the initial electric signal to obtain a second parameter under the control of the controller 27, and the second parameter is equivalent to the optimization of the first parameter, wherein the signal source 29 emits a reference signal to the servo feedback circuit 26; then, the laser 21 emits second laser with the second parameter under the control of the controller 27, and the second laser is stable frequency laser locked based on the initial electric signal, and the atomic clock time frequency information can be obtained based on the second laser, wherein the polarizing beam splitter 28 divides the second laser into second laser 1 and second laser 2, wherein the second laser 2 is used to directly output the atomic clock time frequency information corresponding to the second laser, and the second laser 1 continues to be input to the laser beam splitter 24. The double-layer gas chamber optical frequency atomic clock based on the modulation transfer spectrum principle provided in the embodiment can perform the method as shown in any of the embodiments, and the implementation principle and technical effects are similar, which will not be described here. Figures 2-4 The technical solutions of any of the method embodiments are similar in implementation principle and technical effects, and will not be described here.

[0089] It can be understood that the double-layer gas chamber provided in the embodiments of the present application can also be applied to optical frequency atomic clocks designed based on the saturation spectrum principle or the two-photon spectrum principle to obtain atomic clock time frequency information, and the implementation principle and technical effects are similar, which will not be described here. The design principle of the optical frequency atomic clock using the double-layer gas chamber provided in the embodiments of the present application is not limited.

[0090] Figure 10 The schematic diagram of the electronic device provided in an embodiment of the present application is as shown inFigure 10 As shown, the electronic device 4 provided by the embodiment includes a processor 41 and a memory 42 connected with the processor 41.

[0091] The memory 42 stores computer execution instructions.

[0092] The processor 41 executes the computer execution instructions stored in the memory 42 to implement the method for operating the double-layer gas cell optical frequency atomic clock provided by any one of the embodiments. Figures 2-4 The method for operating the double-layer gas cell optical frequency atomic clock provided by any one of the embodiments.

[0093] The memory 42 and the processor 41 are connected through a bus 43.

[0094] The related descriptions can be referred to the above Figures 2-4 The related descriptions and effects corresponding to the steps in the embodiments can be understood, and will not be repeated here.

[0095] An embodiment of the present application provides a computer readable storage medium, and the computer readable storage medium stores computer execution instructions. Figures 2-4 The method for operating the double-layer gas cell optical frequency atomic clock provided by any one of the embodiments.

[0096] The computer readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0097] An embodiment of the present application provides a computer program product, which includes a computer program. Figures 2-4 The method for operating the double-layer gas cell optical frequency atomic clock provided by any one of the embodiments.

[0098] Figure 11 is a block diagram of a terminal device according to an example embodiment of the present application. The terminal device 800 can be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0099] The terminal device 800 can include one or more of the following components: a processing component 802, a memory 804, a power supply component 806, a multimedia component 808, an audio component 810, an input / output (I / O) interface 812, a sensor component 814, and a communication component 816.

[0100] The processing component 802 generally controls the overall operations of the terminal device 800, such as operations associated with display, telephony calls, data communications, camera operations, and recording operations. The processing component 802 can include one or more processors 820 to execute instructions to complete the steps of the methods described above, in whole or in part. Moreover, the processing component 802 can include one or more modules to facilitate the interaction between the processing component 802 and other components. For example, the processing component 802 can include a multimedia module to facilitate the interaction between the multimedia component 808 and the processing component 802.

[0101] The memory 804 is configured to store various types of data to support the operations of the terminal device 800. Examples of these data include instructions for any application or methods operating on the terminal device 800, contact data, phonebook data, messages, pictures, videos, and so on. The memory 804 can be implemented by any type of volatile or non-volatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disks, or optical disks.

[0102] The power component 806 supplies the various components of the terminal device 800 with power. The power component 806 can include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the terminal device 800.

[0103] The multimedia component 808 includes a screen providing an output interface between the terminal device 800 and a user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes the touch panel, the screen can be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense a touch, a slide, and a gesture on the touch panel. The touch sensor can not only sense a boundary of a touching or a sliding action, but also detect duration and pressure related to the touching or sliding operation. In some embodiments, the multimedia component 808 includes a front camera and / or a back camera. The front camera and / or the back camera can receive external multimedia data when the terminal device 800 is in an operation mode, such as a shooting mode or a video mode. Each of the front and back cameras can be a fixed optical lens system or have a focal length and optical zoom capability.

[0104] The audio component 810 is configured to output and / or input audio signals. For example, the audio component 810 includes a microphone (MIC) that is configured to receive an external audio signal when the terminal device 800 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, the audio component 810 also includes a speaker for outputting audio signals.

[0105] The I / O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which can be a keypad, a click wheel, buttons, and the like. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0106] The sensor component 814 includes one or more sensors for providing status assessments of various aspects of the terminal device 800. For example, the sensor component 814 can detect an open / closed position of the terminal device 800, relative positioning of components, such as a display and a keypad of the terminal device 800, a change in position of the terminal device 800 or a component of the terminal device 800, the presence or absence of user contact with the terminal device 800, the orientation or acceleration / deceleration / g-force and a temperature change of the terminal device 800. The sensor component 814 can include a proximity sensor configured to detect the presence of a nearby object without any physical touch. The sensor component 814 can also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 814 can also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0107] The communication component 816 is configured to facilitate wired or wireless communication between the terminal device 800 and other devices. The terminal device 800 can access a wireless network based on a communication standard, such as WiFi, 3G, 4G, 5G, or other standard communication networks, or a combination thereof. In an example embodiment, the communication component 816 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In an example embodiment, the communication component 816 also includes a near-field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies.

[0108] In exemplary embodiments, the terminal device 800 can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components, for performing the above-described methods of the present application. Figures 2-4 The method provided in any of the corresponding embodiments.

[0109] In exemplary embodiments, a non-transitory computer-readable storage medium including instructions, such as the memory 804 including instructions, is also provided, which can be executed by the processor 820 of the terminal device 800 to complete the above-described method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, and an optical data storage device, etc.

[0110] The embodiments of the present application also provide a non-transitory computer-readable storage medium, when the instructions in the storage medium are executed by the processor of the terminal device, the terminal device 800 can perform the above-described methods of the present application. Figures 2-4 The method provided in any of the corresponding embodiments.

[0111] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and method can be implemented by other means. For example, the apparatus embodiments described above are merely illustrative, for example, the division of the modules is only a logical function division, and actual implementation can have another division manner, for example, a plurality of modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the displayed or discussed each other can be indirect coupling or communication connection through some interfaces, devices or modules, which can be electrical, mechanical or other forms.

[0112] Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the basic underlying principles and features described. All suitable modifications and equivalents can be resorted to as appropriate to the spirit and scope of this application. The terms "comprises", "comprising", "includes", "including", "has", "having" and the like are used herein to mean either "inclusive" or "open-ended" and do not exclude additional, unrecited elements or method steps. All references to a / an / the item herein are to be interpreted in the context of the specification and claims as a non-limiting reference to one or more items unless otherwise indicated. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. Expressions such as "at least one of," when preceding the syllables of a list of elements, modify the entire list of elements and do not change the meaning of the list of elements to a disjunctive.

[0113] It is to be understood that the application is not limited to the precise construction herein described and as shown in the drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the application. The scope of the application is to be interpreted only by the appended claims.

Claims

1. A method for operating a two-layer gas cell optical frequency atomic clock, characterized in that, The application is applied to a double-layer gas chamber optical frequency atomic clock, which comprises a laser, a double-layer gas chamber, and a photoelectric detector, and the double-layer gas chamber stores atoms; The method comprises: controlling the laser to emit first laser with first parameters to the double-layer gas chamber, wherein the first laser is used to generate first modulation detection light corresponding to the first laser by nonlinear effect with the atoms in the double-layer gas chamber; receiving the first modulation detection light by the photoelectric detector and converting the first modulation detection light into initial electric signal; controlling the laser to emit second laser with second parameters according to the initial electric signal, wherein the second laser is laser with stable frequency locked based on the initial electric signal, and obtaining atomic clock time frequency information based on the second laser, wherein the atomic clock time frequency information represents transition frequency of the atoms output by the double-layer gas chamber optical frequency atomic clock.

2. The method of claim 1, wherein, The double-layer gas chamber comprises an inner-layer gas chamber, and the method further comprises: obtaining first temperature information representing real-time temperature value of the inner-layer gas chamber; obtaining control temperature information according to the first temperature information and second temperature information, wherein the second temperature information represents preset temperature variation range of the inner-layer gas chamber; controlling temperature value of the inner-layer gas chamber within the temperature variation range according to the control temperature information.

3. The method of claim 1, wherein, The double-layer gas chamber optical frequency atomic clock further comprises a servo feedback circuit, and the controlling the laser to emit second laser with second parameters according to the initial electric signal comprises: controlling the servo feedback circuit to output error signal according to the initial electric signal, wherein the error signal is electric signal after mixing and demodulation of the initial electric signal and reference signal, and the reference signal is electric signal with same frequency as driving signal of electro-optical modulator; controlling the laser to emit second laser with the second parameters according to the error signal.

4. The method of claim 3, wherein, The servo feedback circuit comprises low-pass filter unit, amplification unit, mixing unit and radio frequency unit; The controlling the servo feedback circuit to output error signal according to the initial electric signal comprises: controlling the low-pass filter unit to filter noise of the initial electric signal to obtain noise-reduced electric signal; controlling the amplification unit to amplify the noise-reduced electric signal to obtain amplified electric signal; controlling the radio frequency unit and the mixing unit to mix and demodulate the amplified electric signal and the reference signal to obtain the error signal.

5. The method of claim 3, wherein, The servo feedback circuit further comprises proportional-integral-derivative control unit, and the controlling the laser to emit second laser with the second parameters according to the error signal comprises: controlling the proportional-integral-derivative control unit to obtain control signal according to the error signal, wherein the control signal is used to adjust output frequency and / or output power of the laser; controlling the laser to emit second laser with the second parameters according to the control signal.

6. The method of claim 1, wherein, The atoms comprise cesium atoms or rubidium atoms.

7. A two-layer gas-cell optical frequency atomic clock, characterized in that, The application comprises: a laser, a double-layer gas chamber, and a photoelectric detector, and the double-layer gas chamber stores atoms; The double-layer gas chamber optical frequency atomic clock is used to implement the double-layer gas chamber optical frequency atomic clock operation method as claimed in any one of claims 1 to 6.

8. The dual-chamber optical frequency atomic clock of claim 7, wherein, The double-layer gas chamber comprises an outer layer gas chamber, an inner layer gas chamber and a heating unit; The outer layer gas chamber is provided with a first cold finger, and the inner layer gas chamber is provided with a second cold finger, the first cold finger is used to pump air to achieve a vacuum environment inside the outer layer gas chamber, and the second cold finger is used to place atoms in the inner layer gas chamber; The inner layer gas chamber and the heating unit are arranged inside the outer layer gas chamber; The heating unit is arranged outside the inner layer gas chamber; The heating unit comprises a base, a heating wire and a temperature sensor; The heating wire is fixed in the base through the first groove structure of the base; The temperature sensor is fixed in the base through the second groove structure of the base.

9. The double-cell gas-cell optical frequency atomic clock of claim 8, wherein, The heating unit is arranged outside the inner layer gas chamber, comprising: The heating unit is fixed outside the inner layer gas chamber through at least one rectangular frame.

10. An electronic device, comprising: Comprising: A processor and a memory connected in communication with the processor; The memory stores computer execution instructions; The processor executes the computer execution instructions stored in the memory to implement the method as claimed in any one of claims 1 to 6.

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