66 results about "Rubidium atom" patented technology

The embodiment of the invention provides a rubidium atomic clock based on a velocity grating spectrum and an implementation method, and the method comprises the steps: enabling a multi-frequency coherent laser source to emit a laser signal containing the velocity grating spectrum, and dividing the laser signal into two paths through a polarization splitting prism; the reflected light beam enters the laser frequency stabilization module to realize laser frequency stabilization; a transmission light beam enters the rubidium bubble through the lens group to interact with rubidium atoms; the photoelectric tube detects a transition spectral line, converts the transition spectral line from an optical signal into an electric signal and transmits the electric signal to the lock-in amplifier for demodulation; the integral amplification module converts the demodulated direct-current voltage into linear increasing voltage and transmits the linear increasing voltage to the crystal oscillator; the crystal oscillator generates an initial microwave signal and generates a microwave signal corresponding to the 87Rb atom through the frequency synthesizer; and the phase frequency modulation module modulates the microwave signal to obtain an error signal and transmits the error signal to the microwave resonant cavity so as to adjust the electromagnetic field according to the error signal to stably lock the rubidium atomic clock. The method is used for achieving the effect of improving the stability of the rubidium atomic clock system.

The invention discloses an optical communication wavelength meter for exciting rubidium atom two-photon transition based on a lithium niobate microcavity optical comb. The optical communication wavelength meter comprises a microcavity optical comb module, a repetition frequency phase-locked loop, an initial frequency phase-locked loop, a rubidium atom gas chamber and a frequency-stabilized light source. The micro-cavity optical comb module is used for generating a fundamental frequency optical comb and a frequency doubling optical comb, rubidium atom two-photon transition is directly excited, the frequency stabilization light source achieves frequency stabilization through rubidium atom saturation absorption, and the repetition frequency phase-locked loop feeds back and adjusts repetition frequency according to error signals of two-photon transition fluorescence intensity. The initial frequency phase-locked loop feeds back and adjusts the initial frequency through beat frequency signals of the frequency multiplication optical comb and the frequency stabilization light source, and the two groups of phase-locked loops stabilize the frequency of the microcavity optical comb to two groups of transition energy levels, so that locking of the repetition frequency and the initial frequency is realized. According to the optical communication wavelength meter based on the lithium niobate microcavity optical comb excitation rubidium atom two-photon transition, the cross modulation effect in a pumping wavelength and pumping power combined adjustment mechanism is avoided, and the size of the optical communication wavelength meter is reduced.

The invention belongs to the field of high-precision time calibration and navigation positioning, and discloses a rubidium atomic clock calibration method based on a Rowland system and a related device. Spectral analysis is performed based on a Welch method and an adaptive peak detection method so as to accurately identify frequency, amplitude and phase parameters of periodic components, then a mixed time difference model including a secondary trend term, a multi-period term and a noise term is constructed, and the model is solved by adopting a least square method so as to obtain key performance parameters of the rubidium atomic clock. And finally completing time calibration of the Rowland system taming rubidium clock. By adopting the method, the parameter estimation precision of the rubidium clock is effectively improved, the problems of mode aliasing, noise sensitivity, non-unique result, low calculation efficiency and the like are solved, and reliable and real-time calibration of the rubidium atomic clock by the Roland system is realized.

The invention relates to the technical field of atomic frequency standards, in particular to a rubidium cold atom gas chamber-based two-photon transition optical frequency standard device, which comprises a two-photon transition clock laser system, a rubidium cold atom gas chamber, a cooling laser system, a sputtering ion pump and a rubidium source, wherein the two-photon transition clock laser system comprises a laser generation modulation light path, a laser power stabilization light path and a laser frequency control light path; the rubidium cold atom gas chamber is arranged behind the Glan-Taylor prism; the cooling laser system comprises a cooling laser, a second isolator, a second polarization beam splitter, a pumping light path, a re-pumping light path and a detection light path; the sputtering ion pump is connected with the rubidium cold atom gas chamber; and the rubidium source is connected with the rubidium cold atom gas chamber. The two lasers are utilized to obtain the two-photon transition signal, so that the rubidium atom two-photon transition light frequency standard with high stability is obtained, and the intensity of the two-photon transition fluorescence signal is improved.

The invention discloses a constant-temperature crystal oscillator and rubidium clock combined taming device and method, and relates to the technical field of time frequency, and the device comprises a single-chip microcomputer, an FPGA module, a TDC module, a rubidium atomic clock and a constant-temperature crystal oscillator. The FPGA module is connected with the single-chip microcomputer, the TDC module, the rubidium atomic clock and the constant-temperature crystal oscillator, the FPGA module is used for receiving a reference 1PPS signal input from the outside, the single-chip microcomputer is connected with the constant-temperature crystal oscillator through the DAC module, the TDC module is connected with the single-chip microcomputer through an SPI bus, the TDC module is used for measuring the phase difference, and the single-chip microcomputer is used for adjusting the voltage control of the constant-temperature crystal oscillator or the frequency of the rubidium atomic clock; and the FPGA module communicates with the rubidium atomic clock through a UART serial port. The output frequency has the characteristics of a constant-temperature crystal oscillator and a rubidium atomic clock at the same time, and low noise and high stability are achieved; a taming state can be quickly entered to output an accurate clock without waiting for preheating of a rubidium clock during startup; a serial taming mode is avoided, parallel taming is adopted, and when one clock source is abnormal, clock hot backup can be achieved.

The invention discloses a three-light atom spectral line frequency locking system for a rubidium atom Rydberg microwave electric field meter, and the system comprises a 780nm laser, a 1260nm laser, a 776nm laser, a saturated absorption spectrum detection system, an EIT detection system, an EIA detection system, a saturated absorption spectrum frequency locking system, an EIT frequency locking system, and an EIA frequency locking system. A three-photon excitation scheme is adopted to replace a traditional two-photon excitation scheme, the size of the used laser is greatly reduced, and the output laser frequency and power are stable; compared with the existing PDH frequency locking method or laser self-operation frequency locking method, the frequency locking method combining the SAS spectrum, the EIT spectrum and the EIA spectrum has the advantages that the laser frequency locking time is greatly prolonged; the atomic spectral line three-light modulation method with the unified common modulation frequency is adopted, the frequency locking complexity of the three-light Rydberg system is fully reduced, and the method has higher popularization practicability.

This invention discloses a rubidium atomic clock frequency adaptive prediction method and system based on LSTM network, belonging to the field of time and frequency technology. The invention includes the following steps: Step 1. Data acquisition; Step 2. Filtering and denoising preprocessing; Step 3. Normalization processing; Step 4. LSTM model training and deployment; Step 5. Frequency prediction; Step 6. Online model adaptation. This invention employs a Long Short-Term Memory (LSTM) network, a special type of recurrent neural network, which can effectively learn the complex time dependencies and noise patterns in rubidium atomic clock time and frequency data. The inherent gating mechanism of the LSTM model makes it adept at capturing long-term dependencies in time series, thus enabling high-precision prediction of short-term frequency fluctuations. Through an online fine-tuning mechanism, this invention allows the LSTM model to continuously adapt to the individual drift and aging characteristics of a single rubidium atomic clock, achieving precise optimization for each clock and model, significantly improving the practicality and long-term stability of the method.

The invention relates to a reflective two-photon rubidium clock atomic fluorescence collection system. The system comprises a rubidium atom gas chamber, a reflector, an optical filter, a lens and a photoelectric detector. The rubidium atom gas chamber is a reflection cavity with a parabolic cylinder structure, the side plane of the rubidium atom gas chamber is a polling light incident plane and is plated with a color separation film for transmitting polling light and reflecting atomic fluorescence, and the polling light incident point is located at the focal point of the parabolic section; the opposite plane of the parabolic cylinder of the reflection cavity is an atomic fluorescence emergent surface, the inner wall of the parabolic cylinder is plated with an atomic fluorescence reflecting film, rubidium atom steam is contained in the parabolic cylinder, and a preset included angle is formed between the reflector and the atomic fluorescence emergent surface and used for reflecting a light path to enable a fluorescence collection light path and a polling light path to be arranged in parallel and converging emergent atomic fluorescence. The optical filter filters stray light with non-target wavelength, the lens converges atomic fluorescence after light filtering, the photoelectric detector receives the fluorescence and converts the fluorescence into an electric signal, and frequency stabilization control of the laser is achieved. By adopting the system, the space utilization rate, the system signal-to-noise ratio and the fluorescence collection efficiency can be improved.

This application discloses an optical communication wavelength meter based on lithium niobate microcavity optical comb-excited rubidium atom two-photon transitions, comprising a microcavity optical comb module, a repetition frequency phase-locked loop (PLL), an initial frequency PLL, a rubidium atom gas cell, and a frequency-stabilized light source. The microcavity optical comb module generates a fundamental frequency optical comb and a frequency-doubled optical comb to directly excite rubidium atom two-photon transitions. The frequency-stabilized light source achieves frequency stabilization through rubidium atom saturation absorption. The repetition frequency PLL adjusts the repetition frequency based on the error signal of the two-photon transition fluorescence intensity. The initial frequency PLL adjusts the initial frequency by feeding back the beat signal between the frequency-doubled optical comb and the frequency-stabilized light source. The two PLLs stabilize the microcavity optical comb to two sets of transition energy levels, achieving frequency locking between the repetition frequency and the initial frequency. The optical communication wavelength meter based on lithium niobate microcavity optical comb-excited rubidium atom two-photon transitions provided in this application avoids the cross-modulation effect in the joint adjustment mechanism of pump wavelength and pump power, reducing the size of the optical communication wavelength meter.

The present invention relates to the technical field of passive rubidium atomic clock design, and specifically, to a complete design method and device for a passive rubidium atomic clock. It includes a microcontroller, a satellite time synchronization module, a test system, a frequency drift correction module, an operation reliability monitoring module, and a big data modeling of component parameters. In the present invention, the VCXO frequency-divided signal is compared with the GPS second pulse signal to detect the frequency deviation. In addition, after the frequency output signal of the rubidium atomic frequency standard is passed through an isolation amplifier, one path is used for output, and the other path is sent to a frequency drift and stability tester to be compared with a high-stability clock signal to obtain the original frequency difference, and then the microcontroller is used to realize the control of frequency deviation correction.

1. The name of the design product: rubidium atomic clock. 2. The use of the design product: used for receiving GNSS satellite signals, and through the technology of taming to make the rubidium oscillator output frequency synchronized with the GNSS satellite cesium atomic clock signal, to provide high-precision time frequency signal. 3. The design points of the design product: in shape. 4. The picture or photo that best shows the design points: perspective view 1.

The application relates to the technical field of atomic clocks, in particular to a method for optimizing the starting characteristics of a rubidium atomic clock, which comprises the following steps: step 1: measuring the relationship between the light intensity and the output frequency accuracy of a certain determined rubidium atomic clock after starting; step 2: theoretically analyzing and testing the relationship between the C-field current and the output frequency accuracy; step 3: determining the relationship between the light intensity telemetry and the C-field current according to the data obtained from steps 1 and 2; step 4: determining the compensation coefficient according to the relationship between the light intensity telemetry and the C-field current obtained in step 3, combining the light intensity telemetry and the C-field current by designing a compensation circuit; and step 5: adjusting the parameters of the compensation circuit, so that the starting characteristics of the rubidium atomic clock are optimized. The application makes the operation of adjusting the starting characteristics of the rubidium atomic clock simple, widens the adjustment range of the starting characteristics of the rubidium atomic clock, reduces the development cost of the rubidium atomic clock, and improves the yield of the rubidium atomic clock.

The invention discloses a rubidium atomic clock intelligent detection method and a detection card, and relates to the technical field of rubidium atomic clocks, and the method comprises the following steps: monitoring the working state of a rubidium atomic clock in real time, and collecting the data of the rubidium atomic clock and the environmental parameters around the rubidium atomic clock in real time; performing real-time analysis and processing on the acquired data according to an Allan variance analysis algorithm and a linear fitting algorithm so as to evaluate the performance of the rubidium atomic clock; a data processing result is fed back to a monitoring system for adjusting the working state of the rubidium atomic clock so as to optimize the performance of the rubidium atomic clock; the rubidium atomic clock has the advantages of being miniaturized, convenient to carry, low in cost, high in real-time performance and capable of achieving multi-parameter monitoring, real-time monitoring and fault early warning of the state of the rubidium atomic clock can be achieved, and a solid foundation is laid for high-precision navigation.

This invention discloses an optical non-reciprocal information encryption method and apparatus based on a time crystal. The method includes the following steps: S1, providing a three-level atomic system containing rubidium atoms, and setting a probe light and a coupling light, wherein the probe light is incident on the atomic system in a fixed direction; S2, controlling the coupling light to propagate collinearly in the opposite direction to the probe light, causing the atomic system to enter a time crystal state and generate a transmission signal with a stable oscillation frequency; S3, acquiring the oscillation frequency of the transmission signal and encoding the oscillation frequency as key information; S4, placing the atomic system in a non-time crystal state, where the transmission signal does not contain the oscillation frequency, thereby achieving non-reciprocal encryption of the key information. This invention causes the atomic system to enter or leave a time crystal state to generate or suppress a transmission signal with a stable oscillation frequency, and encodes and encrypts the oscillation frequency as key information.

This application provides a rubidium optically pumped magnetometer and its measurement method, belonging to the field of magnetometer technology. The entangled photon component includes a first laser and a nonlinear optical crystal, the nonlinear optical crystal being used to convert photons emitted by the first laser into entangled photon pairs; a rubidium atom gas cell for receiving the entangled photon pairs; a laser cooling system for cooling rubidium atoms to a Bose-Einstein condensate; and an interferometer phase detection system including a second laser, a first beam splitter, a beam combiner, and a signal processor. This application introduces entangled photons to form a quantum entangled state with rubidium atoms. The introduced entangled photons, through coupling with the rubidium atom system, form an enhanced quantum interference effect. Traditional rubidium optically pumped magnetometers are limited in measurement accuracy by quantum noise, but by introducing entangled photons, the system's measurement noise is reduced, thereby achieving higher measurement accuracy.

The small rubidium spectral lamp comprises a bulb and a metal base, the metal base is sleeved with a heating wire, and a glass sleeve installation through hole, a heat conduction channel with the inner diameter gradually reduced and a bulb tail fixing groove are sequentially formed in the metal base in the length direction of the metal base. One end of the glass sleeve is mounted in the glass sleeve mounting through hole, and an oscillating coil is embedded in the inner wall of the glass sleeve; the bulb comprises a bulb body, a conical area and a bulb tail, the conical area and the bulb body are integrally arranged, the bulb tail is located in the bulb tail fixing groove, the conical area is located in the heat conduction channel, the bulb body is wound by the oscillating coil, the two ends of the oscillating coil are electrically connected with the lamp excitation plate, and the lamp excitation plate is fixed to the lamp heat dissipation fixing plate. And the lamp excitation plate is connected with the metal base through a stud and a gap is reserved between the lamp excitation plate and the metal base. The working stability of the spectrum lamp in the vacuum environment can be improved, the temperature coefficient of the spectrum lamp is optimized, the light intensity of the spectrum lamp is stabilized, the size of the spectrum lamp is reduced, the structure is simple, and implementation is easy.

The invention provides a self-excitation type Mx rubidium atom magnetometer device and a working method, the self-excitation type Mx rubidium atom magnetometer device comprises an atom magnetometer probe and an atom magnetometer driving circuit, and the atom magnetometer probe is connected with the atom magnetometer driving circuit; the atom magnetometer probe comprises a VCSEL laser tube, an electro-optical modulator, a 1 / 4 slide, a rubidium atom gas chamber and a photosensitive tube. The atom magnetometer driving circuit comprises a lock-in amplifier, a phase shifter, an EOM driver and a laser tube driver. According to the invention, the atom magnetometer driving circuit synchronously modulates the polarization state and the light intensity of the pumping laser in the rubidium atom magnetometer to form an auto-excitation feedback loop, so that the problem that the radio frequency magnetic field feedback auto-excitation working mode adopted by the traditional Mx magnetometer is not suitable for the rubidium atom magnetometer is solved; and an instable feedback loop is formed.

This application provides a rubidium atomic clock based on a velocity grating spectrum and its implementation method. The method includes: a multi-frequency coherent laser source emitting a laser signal containing a velocity grating spectrum, which is split into two paths by a polarization beam splitter; the reflected beam is injected into a laser frequency stabilization module to achieve laser frequency stabilization; the transmitted beam is injected into a rubidium bulb through a lens group to interact with rubidium atoms; a phototube detects transition spectral lines, converts the transition spectral lines from optical signals to electrical signals, and transmits them to a lock-in amplifier for demodulation; an integral amplification module converts the demodulated DC voltage into a linearly increasing voltage and transmits it to a crystal oscillator; the crystal oscillator generates an initial microwave signal and generates a frequency synthesizer. 87 The microwave signal corresponding to the Rb atom; the phase-frequency modulation module modulates the microwave signal to obtain an error signal, which is then transmitted to the microwave resonant cavity to adjust the electromagnetic field according to the error signal, thereby stabilizing and locking the rubidium atomic clock. This method is used to improve the stability of the rubidium atomic clock system.

According to the rubidium isotope proportion measuring device and method based on the nuclear spin slowing factor, two beams of orthogonal laser are driven through an automatic upper computer, magnetic resonance frequencies of a high-temperature alkali metal air chamber in different bias magnetic fields are searched under different optical powers, the gyromagnetic ratio is calculated through linear fitting, and therefore the nuclear spin slowing factor of an atom ensemble is obtained, and the rubidium isotope proportion measuring method based on the nuclear spin slowing factor is obtained. And solving an overdetermined equation set by using the relationship between the slowdown factor and the isotope proportion and the rubidium atom isotope proportion, thereby realizing accurate measurement of the rubidium atom gas chamber gas isotope proportion. Compared with a conventional method, the device and the method have the advantages of accuracy, rapidness, simplicity and lower cost, and the closed air chamber structure does not need to be damaged.

The present application relates to a kind of system and method for improving the transient bandwidth of Rydberg atom microwave sensor, including two lasers, respectively for generating probe light and coupling light;Probe light and coupling light are all through half-wave plate and obtain first vertical polarized light by reflecting through polarizing beam splitter, the light transmitted through polarizing beam splitter is sequentially adjusted into second vertical polarized light by a mirror and a half-wave plate;Two-way probe light and coupling light are respectively in two rubidium atom cell opposite coincident propagation, the probe light of reference rubidium atom cell and polarizing beam splitter and the probe light after rubidium atom cell filled with buffer gas and half-transmission half-reflection mirror are all received by photoelectric detector;Signal microwave and local microwave are respectively radiated to two rubidium atom cell by power divider and microwave horn antenna, after applying microwave electric field, the intensity of beat frequency signal generated by the interference of signal microwave and local microwave is measured by the change of light intensity near EIT resonance.

This invention discloses a rubidium atomic clock discipline method and related products based on the fusion of BeiDou and longwave dual-source signals, belonging to the field of high-precision time and frequency synchronization technology. The method of this invention simultaneously measures the first time difference between the rubidium atomic clock and the BeiDou reference time signal, and the second time difference with the longwave reference time signal, fusing the short-term accuracy of BeiDou with the long-term stability of longwave. An extended Kalman filter model is constructed, whose state vector includes a first type of state variable representing the time-frequency characteristics of the rubidium atomic clock and a second type of state variable representing the fused time difference between BeiDou and longwave. The first and second time difference values ​​are used as observation inputs for iterative estimation, synchronously updating the optimal values ​​of the two types of state variables. A frequency adjustment is generated based on the optimal estimate, and closed-loop control is performed on the output frequency of the rubidium atomic clock. This invention can synergistically utilize the advantages of BeiDou and longwave dual-source signals to achieve time synchronization with high instantaneous accuracy and long-term reliability.

The invention discloses a rubidium atomic clock-cavity optical mechanical system photoproduction microwave source carrying a lithium niobate frequency doubling cavity. The rubidium atomic clock-cavity optical mechanical system photoproduction microwave source comprises a tunable laser source, a cavity optical mechanical system, a frequency doubling system, a rubidium atomic clock system and a feedback frequency locking system. According to the invention, a periodically poled lithium niobate waveguide is adopted as a frequency doubling system, frequency doubling processing is carried out on optical signals output by a silicon-based cavity optical mechanical system, a-1550nm wave band laser with a narrow line width and high device maturity is used for replacing a-795nm wave band laser, an optical microcavity with a high quality factor is prepared by a mature process, meanwhile, conditions required by hyperfine splitting of a rubidium atomic clock are met, and the optical microcavity can be applied to hyperfine splitting of a rubidium atomic clock. Compared with an existing mode of exciting an atomic clock through a micro-cavity made of a wide transparent window such as lithium niobate but an immature material in preparation process, the cavity optical mechanical chip processing and preparation precision is improved, the optical resonance Q value of the micro-cavity is improved by adopting a high-refractive-index silicon-based photonic crystal, and the maturity and stability of a system device are improved by adopting a 1550 nm waveband laser; and an efficient and stable photo-generated microwave signal source architecture can be realized.

The application discloses a remote voice conversation listening method based on Rydberg atoms, which comprises the following steps: a probe light, a decoration light and a coupling light are used to cooperatively excite rubidium atoms in a rubidium atom gas chamber to a high Rydberg state, the frequency of the coupling light is scanned, an EIT spectrum is obtained, and an EIT resonance point is acquired; the frequency and power of a local microwave are adjusted, the frequency of the coupling light is scanned, and the EIT spectrum exhibits a critical state of AT splitting; the local microwave K L is used to scan the frequency of the coupling light after being reflected by a to-be-detected target to the rubidium atom gas chamber, an EIT-AT spectrum and a superposition spectrum of a vibration signal K S are acquired; the frequency of the coupling light is locked at the EIT resonance point, and the vibration signal K S is restored; and the vibration signal K S is denoised. The application further discloses a remote voice conversation listening device based on Rydberg atoms, wherein, when the device is used for listening, a vibration signal in a human voice frequency range is detected, and vibrations outside the human voice frequency are shielded. The application has a simple structure and does not need complex demodulation and filtering and amplifying links.

The invention provides a partially coherent light beam cloning method based on hot rubidium atom gas. A Gaussian beam and a partially coherent beam act on hot rubidium atom gas at the same time, the Gaussian beam serves as detection light, the partially coherent beam serves as pump light, and precise cloning of the spatial correlation characteristics of the detection light is achieved by combining cooperative regulation and control of microwaves and a magnetic field. In the cloning process, rubidium atoms in the atom pool transfer the anti-bunching coherent characteristic of the pump light to the probe light under the control of microwave parameters, and the spatial correlation structure of a cloned light beam can be observed through CCD detection and computer reconstruction. According to the method, whether the detection light carries the spatial correlation characteristic or not is dynamically regulated and controlled through microwaves, the optical switch and information relay function is achieved, the advantages of being high in fidelity, low in noise and adjustable in parameter are achieved, and a new technical approach is provided for an optical communication network and a quantum information processing system.

This invention discloses a three-photon atomic spectral line frequency-locking system for a rubidium atom Rydberg microwave field meter, comprising a 780nm laser, a 1260nm laser, a 776nm laser, a saturated absorption spectroscopy detection system, an EIT detection system, an EIA detection system, a saturated absorption spectroscopy frequency-locking system, an EIT frequency-locking system, and an EIA frequency-locking system. This invention uses a three-photon excitation scheme instead of the traditional two-photon excitation scheme, significantly reducing the size of the laser used and ensuring stable output laser frequency and power. This invention employs a frequency-locking method combining SAS, EIT, and EIA spectra, which significantly improves the laser frequency-locking time compared to current PDH frequency-locking methods or laser self-operation frequency-locking methods. This invention uses a three-photon modulation method with a unified common modulation frequency for atomic spectral lines, effectively reducing the complexity of frequency-locking in the three-photon Rydberg system, making the method more widely applicable and practical.

The invention discloses a clock group device integrating two cesium atomic clocks and one rubidium atomic clock, and relates to the technical field of atomic clocks. The device comprises two cesium atomic clocks, a rubidium atomic clock and a control system, and the control system is used for controlling the cesium atomic clocks and at least one rubidium atomic clock to work, so that when the rubidium atomic clock generates short-term and medium-term comprehensive atoms, and when the cesium atomic clock generates long-term atoms. The clock group device integrates the design of double cesium-beam tubes: the two cesium-beam tubes are detected by sharing one set of laser system, so that the space utilization rate is improved, and the cost is reduced; the two cesium-beam tubes are respectively controlled by arranging the double servo systems of the clocks with slight deviation, so that the two cesium atomic clocks do not generate relevance under the condition of sharing laser; the timekeeping system is designed according to the frequency characteristics of the caesium atomic clock length stability and the caesium atomic clock length stability so as to realize the basic functions of the clock group. According to the invention, the clock group function can be realized under the conditions of small size and low cost.

The invention relates to an intelligent 100MHz frequency reference signal generation and distribution system design method and device. The rubidium atomic clock equipment is connected with the frequency standard equipment, the frequency standard equipment is connected with the reference power division equipment, the connection mode adopts an LRMV connector, and the equipment can be switched between a main working mode and a backup working mode; 2 paths of 100MHz signals output by the rubidium atomic clock equipment are processed by the frequency standard equipment and the reference power division equipment, and 22 paths of 100MHz signal output of the system are determined; and the frequency standard equipment processes the rubidium atomic clock equipment working state, the rubidium atomic clock equipment telemetry information, the reference power division equipment working state and the reference power division equipment telemetry information reported by the rubidium atomic clock equipment and the reference power division equipment, and reports the processed information and the frequency standard equipment telemetry information to the upper computer system. The whole system has the functions of generating and distributing 100MHz signals, and has the characteristics of high isolation, high stability and low phase noise; each device has telemetering information acquisition and fault detection functions, and telemetering information is reported to an upper computer system through a frequency standard device.

The invention discloses a passive multi-throw optical multistable all-optical switch based on an annular cavity system and a control method thereof, and the passive multi-throw optical multistable all-optical switch is characterized in that the passive multi-throw optical multistable all-optical switch comprises a one-way annular optical cavity and a rubidium bubble, the rubidium bubble is a cylindrical glass bubble which is located at the central position of the axis of the left upper cavity mirror and the central position of the axis of the right upper cavity mirror and filled with rubidium 85 atomic gas, and a monochromatic light field in the cavity can penetrate through the left side and the right side of the cylindrical glass bubble. Under the strong coupling condition of an atom-cavity system, the monochromatic cavity mode can excite multiple transition energy levels of rubidium atoms at the same time, so that strong optical nonlinear interaction is caused, and multiple different transmitted light intensity values can be achieved by modulating the light intensity of signal light. The multi-throw all-optical switch disclosed by the invention is based on an optical multistable state excited by signal light, does not need an additional auxiliary light field, a magnetic field and the like, and has the advantages of wide band, passivity, low power consumption, multiple channels, simple structure, easiness in integration and miniaturization and the like.

This invention provides a rubidium atomic clock servo control system and method based on FPGA, belonging to the field of atomic frequency standard technology. The system includes a laser driving current modulation module, a microwave radio frequency synthesis module, a photoelectric signal acquisition module, a laser frequency locking module, a microwave frequency locking module, a laser temperature control module, a cavity temperature control module, and a magnetic field control module. This invention adopts FPGA digital integration of VCSEL driving current modulation, high-precision microwave radio frequency signal generation, and digital frequency locking control to replace traditional analog circuits, reduce system complexity and cost, and improve the stability and reliability of the rubidium atomic clock.

The present application relates to a system and method for real-time measurement of microwave polarization direction based on two local microwave electric fields, comprising two lasers, a microwave source and a microwave horn antenna, a Helmholtz coil, a rubidium atomic cell, a motorized rotating stage, a photodetector and a spectrum analyzer, the two lasers generate probe light and coupling light respectively, and the microwave horn antenna radiates microwave to the rubidium atomic cell. The probe light and the coupling light excite the atoms in the rubidium atomic cell to the Rydberg state under the influence of the microwave electric field. By measuring the transmittance change of the probe light with a frequency near the electromagnetically induced transparency resonance frequency, two beat frequency signal amplitudes of different frequencies generated by the two local microwave electric fields and the signal microwave electric field are obtained, and the real-time measurement of the polarization direction of the signal microwave electric field is realized according to the ratio of the two beat frequency signal amplitudes. By measuring the change of the beat frequency signal amplitude before and after applying a magnetic field, the angular resolution of the microwave electric field polarization direction in the range of 0 to 180 degrees is realized.