356results about "Apparatus using atomic clocks" patented technology

The invention relates to the technical field of atomic clock control, and discloses a punctuality type atomic clock control method based on a microwave frequency band. The method comprises the following steps: firstly, acquiring microwave frequency band signal data and atomic state data, and constructing a time calculation model in combination with historical operation data to output a theoretical time value; performing multi-dimensional difference analysis on the theoretical time value and the actual measurement time value to generate a time difference coefficient matrix; inputting the matrix into a spatial propagation analysis network, and combining atomic clock component parameters and environmental parameters to generate a time anomaly probability distribution diagram; and finally, configuring microwave control parameters according to the distribution diagram, including starting a high-frequency monitoring mode for a high-probability abnormal region and applying a disturbance test to adjacent frequency bands. According to the method, through multi-dimensional data modeling, difference analysis and dynamic parameter configuration, the accuracy and adaptability of atomic clock control are improved, and the operation stability of the atomic clock in a complex environment can be enhanced.

The application discloses a double-resonance atomic clock ultra-miniature substrate integrated waveguide chamber, comprising: a substrate integrated waveguide annular gap cavity, the substrate integrated waveguide annular gap cavity is formed by longitudinal stacking of a plurality of longitudinal slit substrate integrated waveguides, the longitudinal slit substrate integrated waveguide comprises a metalized through hole and a metal microstrip line, and the longitudinal slit substrate integrated waveguide is provided with a longitudinal slit; a MEMS atomic gas chamber; a mode matching excitation structure for exciting a microwave magnetic field to the substrate integrated waveguide annular gap cavity; and an electromagnetic shielding and heating assembly arranged outside the substrate integrated waveguide annular gap cavity. The application can effectively solve the key problem that the resonant performance of a printed miniature annular gap cavity is extremely sensitive to the size change of subwavelength structure parameters, increase the processing tolerance of the ultra-miniature integrated chamber, reduce the processing difficulty and manufacturing cost of high-precision PCB through holes, and improve product yield.

The invention relates to an atomic clock frequency anomaly detection method, and belongs to the technical field of deep learning and the field of atomic clock anomaly detection. The method comprises the following steps: acquiring a frequency sequence set with a label generated by an atomic clock in a normal frequency sequence injection known abnormal mode; performing supervised training on the anomaly detection model by using the frequency sequence set; in the anomaly detection model, performing feature fusion, nonlinear transformation and classification on a first path of features extracted by performing multilayer decomposition on an input frequency sequence by adopting discrete wavelet transform and a second path of features extracted by adopting a CNN-Transformer network on the input frequency sequence, and then detecting an abnormal frequency sequence; and performing frequency anomaly detection on the atomic clock frequency sequence acquired in real time by using the trained anomaly detection model. According to the invention, high-precision detection of frequency anomalies with different characteristics is realized, the detection range is expanded, and the detection precision is improved.

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a system includes a laser system, a vapor cell sensor, an optical detector, and a signal processing system. The laser system includes a first laser that generates a first laser signal; a comb generator that produces a frequency comb signal based on the first laser signal; and a second laser generates a second laser signal. The vapor cell sensor includes a vapor and receives input optical signals based on the frequency comb signal and the second laser signal. The vapor cell sensor produces output optical signals based on interactions of the vapor with the input optical signals and electromagnetic radiation. The signal processing system processes the output optical signals to identifying signals in the electromagnetic radiation that are off resonance with a transition frequency between Rydberg states of the vapor.

The invention discloses a power line fog penetration monitoring method, system and device based on polarization-infrared multi-mode fusion and a medium. An atomic clock is tamed to trigger infrared pulse and polarization exposure, and pixel offset caused by jitter of an unmanned aerial vehicle is compensated through an image motion analysis method; constructing a polarization physical model, and establishing a relationship between the fogdrop particle size and the polarization degree; performing multi-modal feature fusion, constructing a double-branch deep learning network, and performing output judgment on the image according to a dynamic fusion strategy; and optimizing conductor features and insulator features in the power line through a special convolution kernel, and accurately extracting target features.

An optical frequency generation system (100), comprising: - reference atoms (7) in a gas phase, - an interrogation laser source (1) configured to emit an interrogation signal (101) comprising a first optical frequency suitable for exciting a two-photon transition in said reference atoms (7), said interrogation signal (101) being configured to interact with said reference atoms (7) in a Doppler-free scheme; - optical frequency modulation means (31, 31a, 31b) configured to adjust said first optical frequency and to modulate said first optical frequency at a first modulation frequency f1; - an optical sensor (9) configured to detect a fluorescence signal (110) from said reference atoms (7); - a first control loop (10) configured to lock said first optical frequency to a resonance frequency of said two-photon transition, said fluorescence signal (110) being input into the first control loop (10); - a mitigation laser source (2) configured to emit a mitigation signal (102) comprising a second optical frequency selected to produce a light-shift of said two-photon transition of opposite sign of the light-shift produced by the interrogation signal (101); characterized in that the optical frequency generation system (100) further comprises: - optical amplitude modulation means (5) configured to modulate the amplitude of the interrogation signal (101) and of the mitigation signal (102) at a second modulation frequency f2, and - a second control loop (20) configured to adjust the relative amplitude of the mitigation signal (102) with respect to the interrogation signal (101) such as to cancel the effective light-shift of the combined interrogation (101) and mitigation (102) signals.

Provided is an interposer comprising: one or more photonic waveguide; one or more microwave circuit; one or more optical interconnect; and one or more electronic interconnect, further configured to support a quantum sensor, and methods of operating and fabricating thereof. Further provided is a the interposer containing one or more classical sensors. Further provided is a network of quantum sensors supported by said interposers.

The invention discloses a distributed radar time-frequency synchronization and transmit-receive coherent method and system, and belongs to the technical field of radars. The method comprises the following steps: connecting each transmitting station and each receiving station of the distributed radar with a synchronization device, wherein the synchronization device comprises timing system equipment, an atomic clock and wireless communication equipment; the distributed radar receives working parameters issued by the wireless communication center controller to the distributed radar by using the wireless communication equipment; according to the working parameters, the transmitting station starts to transmit a radar signal after receiving a trigger synchronization signal of the timing system equipment, and the receiving station starts to collect an echo signal based on a local oscillator signal after receiving the trigger synchronization signal of the timing system equipment; the radar signal and the local oscillator signal are both generated based on the connected atomic clock as a reference clock. According to the invention, time-frequency synchronization and transmit-receive coherence of the distributed radar can be realized by using the synchronization device, limitation of space wired connection is avoided, and the construction cost of the distributed radar is reduced.

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a system includes a laser system, a vapor cell sensor, an optical detector, and a signal processing system. The laser system includes a first laser that generates a first laser signal; a comb generator that produces a frequency comb signal based on the first laser signal; and a second laser generates a second laser signal. The vapor cell sensor includes a vapor and receives input optical signals based on the frequency comb signal and the second laser signal. The vapor cell sensor produces output optical signals based on interactions of the vapor with the input optical signals and electromagnetic radiation. The signal processing system processes the output optical signals to identifying signals in the electromagnetic radiation that are off resonance with a transition frequency between Rydberg states of the vapor.

In a general aspect, a quantum spectrum sensing system is presented. In some implementations, a quantum spectrum sensing system includes a laser system, a vapor cell sensor, and an optical detector. The laser system includes first and second lasers configured to generate a first and second laser signals. The laser system also includes first and second comb generators configured to produce first and second frequency comb signals based on the first and second laser signals, respectively. The laser system includes a frequency separator that can select frequency components of the second frequency comb signal and a frequency shifter that can shift the selected frequency components toward Rydberg states of a vapor. The vapor cell sensor can receive input optical signals from the laser system and produce output optical signals based on interactions of the vapor with the input optical signals. The optical detector can detect the output optical signals.

According to the packaging method for the chip atomic clock physical system, the getter with the low activation temperature and the solder ring with the high heat sealing temperature are selected, meanwhile, the temperature gradient with the degassing temperature, the getter activation temperature and the vacuum heat sealing temperature rising in sequence is designed, the getter is deposited on the inner wall of the ceramic cap through the chemical vapor deposition technology, and the chip atomic clock physical system is obtained. The integrated structure of the ceramic cap and the getter is formed, the adsorption area is increased through the full-coverage design of the getter, in the out-of-furnace assembly link, the photoelectric component is fixed through a preset bearing area of the ceramic base, the solder ring is limited through an edge sealing area, and the alignment deviation is detected and adjusted in cooperation with an assembly clamp for positioning and a detection tool for detecting and adjusting. The system to be packaged is ensured to be accurately aligned before entering the furnace, part dislocation caused by view limitation in traditional in-furnace assembly is avoided, the comprehensive effects of equipment demand reduction, production efficiency improvement and packaging precision improvement are finally achieved, and it is ensured that the frequency stability and the service cycle of the chip atomic clock meet the use demand.

In a general aspect, antirelaxation coatings are disclosed for coating the interior surfaces of vapor cells. In certain aspects, a vapor cell includes a dielectric body having interior and exterior surfaces. The interior surface defines a cavity in the dielectric body, and the exterior surface defines an opening to the cavity. The vapor cell also includes an antirelaxation coating that is disposed on the interior surface of the dielectric body and includes an organosilane material. The vapor cell additionally includes a vapor or a source of vapor residing in the cavity as well as an optical window that covers the opening to the cavity. The optical window has a surface bonded to the exterior surface of the dielectric body to form a seal around the opening. The vapor or the source of vapor includes alkali metal atoms.

The application belongs to the field of optical precision manufacturing, and relates to a bottom-up atomic gas chamber manufacturing device and manufacturing method. The device is composed of a vacuum cavity, a pumping pipeline, a gas inlet pipeline, a discharge electrode plate set, an insulating support, a gas chamber, a laser, an alkali metal source and a vacuum gauge. The device is used for manufacturing the atomic gas chamber from bottom to top, and can be used for preparing various gas chambers with different gas pressure ratio requirements, thereby helping to realize customized preparation. The device reduces the disadvantages of impurity adsorption on the inner wall of the gas chamber and reduces uncontrollable risks. The device has high integration, high preparation efficiency and large secondary development space, and is favorable for accelerating the technical iteration of the atomic gas chamber and the cross-generation development of key technologies such as nuclear magnetic resonance gyroscopes, atomic clocks and magnetometers.

The application relates to a control communication interface optimization method in semi-physical simulation, in particular to the field of ship gas turbine semi-physical simulation, which effectively improves the timing accuracy and anti-interference of semi-physical simulation control through multi-technology fusion, realizes high-precision error collection by using an atomic clock marker, dynamically optimizes control instructions in combination with an intelligent algorithm, compensates for current transmission delay, prospectively suppresses future disturbance through a neural network, and finally outputs accurate frequency compensation through an adaptive fusion mechanism, thereby realizing signal alignment and closed-loop feedback, and significantly enhancing the stability and response speed of the system under complex working conditions.

The invention provides a single-frequency laser system and an optical clock and optical tweezers comprising the single-frequency laser system, a first single-frequency laser of the single-frequency laser system is a single-frequency thulium-doped distributed feedback fiber laser, and the first single-frequency laser is used for outputting first single-frequency laser; the thulium-doped optical fiber amplification module is used for receiving the first single-frequency laser and amplifying the power of the first single-frequency laser to form first amplified laser; the second single-frequency laser is used for outputting second single-frequency laser; the erbium-doped fiber amplification module is used for receiving the second single-frequency laser and amplifying the power of the second single-frequency laser to form second amplified laser; the laser beam combining module is used for combining the first amplified laser and the second amplified laser to form combined laser; and the sum frequency module is used for performing sum frequency conversion on the combined laser to form output laser which is output outwards. When the single-frequency laser system is applied to the optical clock, the frequency stability and various performance indexes of the optical clock can be improved; when the method is applied to optical tweezers, the control performance of the optical tweezers on atoms can be improved.

A high-temperature tank (116) includes an optical window which transmits a laser (132) and is provided at one end, and a right-angle conical mirror (102) which is provided at the other end, has an opening (106) at the apex and which reflects laser light (132) incident from the optical window towards the one end in an area other than the opening (106). A magnetic field generator (112) generates a magnetic field in the region of intersection of the laser reflected by the right-angle conical mirror (102). A magnetic field gradient relaxation module (130) generates a relaxation magnetic field which relaxes the gradient of the magnetic field generated by the magnetic field generator (112).

The invention provides a method for constellation time keeping in a free operation state of a satellite-borne atomic clock, and the method comprises the steps: generating an adjustable second time frequency signal through frequency synthesis based on a first time frequency signal outputted by the satellite-borne atomic clock; comparing and measuring the phase difference between the two and sending the phase difference to an inter-satellite link; through inter-satellite measurement and interaction, obtaining a clock error between the second time frequency signals of all satellites, and converting to obtain a clock error between the first time frequency signals of all satellites; and on the basis, a clock difference parameter between the constellation time and the first time-frequency signal is calculated and converted into a clock difference parameter between the constellation time and the second time-frequency signal, a frequency adjustment parameter is generated through a control algorithm, and the second time-frequency signal is controlled to gradually approach the constellation time. The invention further provides a device for constellation time keeping in the free operation state of the satellite-borne atomic clock. Therefore, the free operation requirement and the irregular frequency modulation requirement of the satellite-borne atomic clock under the navigation constellation autonomous time keeping scene can be considered, and the constellation autonomous time keeping precision and the user service performance are improved.

This application provides an optical clock and its implementation method that directly interacts with an optical comb and an atomic beam. The method includes: an optical comb emitting broadband light with a spectral width of a first spectral width; a filter filtering the broadband light to obtain a comb tooth signal corresponding to the atomic transition frequency; an acousto-optic modulator modulating the comb tooth signal; an atomic furnace emitting an atomic beam; a reflector reflecting the modulated comb tooth signal to form four parallel laser beams that pass through the atomic beam; a laser emitting a probe laser; a beam splitter splitting the probe laser into two beams, which are injected into the atomic beam before and after the four parallel laser beams pass through, respectively, generating a fluorescence signal; a photodetector detecting the fluorescence signal and loading it into a mixer; the mixer demodulating the fluorescence signal to obtain an error signal; a servo feedback circuit generating a servo signal based on the error signal and feeding it back to the optical comb; and the optical comb processing the comb tooth signal based on the servo signal to lock the frequency of the comb tooth signal to the atomic transition frequency.

The present disclosure relates to atomic quantum and photonic apparatuses and methods, for example, atomic radio apparatuses and methods. The disclosure describes various aspects of atomic radio. More specifically, the disclosure describes an atomic radio apparatus and associated hardware. Methods for performing radio communications, sensing, and imaging, are described. The disclosure further describes laser, optical, photonics, atom-photonics, and hybrid micro-integrated subsystems for Rydberg excitation, spectroscopy, and quantum technology.

The application provides a high-temperature-resistant small optical system packaging structure and a packaging method, and relates to the technical field of optical system packaging. The packaging method first uses high-temperature-resistant ceramics to prepare a high-temperature-resistant ceramic packaging structure base, and then sequentially stacks small optical systems and bonds the small optical systems on the high-temperature-resistant ceramic packaging structure base; then, in a water-free and oxygen-free environment, an indium-based sealing ring is used to complete the welding between the high-temperature-resistant ceramic packaging shell, the indium-based sealing ring and the high-temperature-resistant ceramic packaging structure base at low temperature. The low-temperature welding has small thermal damage to the devices in the small optical system, small residual thermal stress, good physical system airtightness, and the obtained packaging structure can maintain high stability and airtightness in a high-temperature environment. The packaging structure base and the packaging shell of the packaging structure both use high-temperature-resistant ceramics, and the overall thermal expansion of the packaging structure is consistent, so that damage caused by inconsistent stress when working in a high-temperature environment is avoided.

The invention provides a temperature self-adaptive frequency locking system and method applied to a CPT atomic clock, the system comprises a TEC heating sheet 1, a VCSEL laser 2, a temperature sensor 3, a gas chamber shell 4, a gas chamber 5 and the like, the VCSEL laser 2 is tightly attached to the surface of the TEC heating sheet 1, the temperature sensor 4 is arranged near the outer side of the gas chamber 5, the gas chamber 5 is wrapped by the gas chamber shell 4, and the TEC heating sheet 1 is arranged in the gas chamber shell 4. A heating resistor network 7 is arranged at the lower part of the air chamber 5; a laser beam emitted by the VCSEL laser 2 passes through the gas chamber 5 and then is received by the photoelectric sensor 6. The whole control is executed by a CPT atomic clock control system 9; and feedback signals of the temperature sensor 4 are respectively transmitted to the frequency drift algorithm processing module 10 and the control parameter adjustment algorithm processing module 11. Output signals of the two modules are transmitted to a CPT atomic clock control system 9; a feedback signal of the photoelectric sensor 6 is also transmitted to the CPT atomic clock control system 9; the VCO voltage-controlled crystal oscillator 8 is controlled by the CPT atomic clock control system 9 and outputs frequency to the outside.

In a general aspect, methods for manufacturing vapor cells are disclosed. In certain aspects, a method of manufacturing a vapor cell includes obtaining a dielectric body that has interior and exterior surfaces. The interior surface defines a cavity in the dielectric body, and the exterior surface defines an opening to the cavity. The method includes forming an antirelaxation coating on the interior surface of the dielectric body. The antirelaxation coating comprising an organosilane material. The method additionally includes disposing a vapor or a source of vapor in the cavity and obtaining an optical window that comprises a surface. The vapor or the source of vapor includes alkali metal atoms. The method also includes bonding the surface of the optical window to the exterior surface of the dielectric body to form a seal around the opening to the cavity.

The application discloses a kind of high-precision Beidou time service master clock devices based on double-chip atomic clock fusion, it relates to timing synchronization technical field, the device includes satellite receiving module, master control processing module, double-chip atomic clock module, clock taming module, time-frequency output module, display control module and power module;Each module is cooperated by work mode automatic switching mechanism Work;Double-chip atomic clock module adopts two pieces chip level atomic clock and constitutes master-slave redundant architecture, and the phase and frequency deviation information of main atomic clock and slave atomic clock are fused and mutually checked by extended Kalman filtering;The taming algorithm in clock taming module is formed by extended Kalman filtering link, PID controller link, digital phase-locked loop link cascade;Work mode automatic switching mechanism is according to the automatic switching of work mode according to the operating state of the device;Overcome the insufficient of time service precision, low reliability, taming algorithm performance is limited and so on in prior art.

A vapor cell includes a cell body and a cell window anodically bonded to the cell body. The cell window and the cell body define a vapor cavity configured to contain a vapor comprising a plurality of alkali atoms.

In a general aspect, a communication system comprises a first station and a second station. Each station includes a transceiver and a control subsystem. The transceiver includes having one or more photonic crystal masers and one or more photonic crystal receivers. The control subsystem includes one or more lasers optically coupled to the one or more photonic crystal masers and the one or more photonic crystal receivers. The control subsystem also includes modulation electronics in communication with the one or more lasers and configured to control one or more properties of a first input optical signal received by each photonic crystal maser. The control subsystem additionally includes demodulation electronics in communication with the one or more lasers and configured to control one or more properties of a second input optical signal received by each photonic crystal receiver.

The application relates to the technical field of atomic clocks, and provides a chip optical clock based on a modulation transfer spectrum principle and an implementation method thereof. The chip optical clock comprises: an on-chip narrow-line-width laser for emitting laser; a waveguide beam splitter for splitting the laser into two beams; one beam of laser is used for inputting into an electro-optic phase modulator, and the other beam of laser is used for inputting into a MEMS atomic cell; the electro-optic phase modulator is used for phase-modulating the one beam of laser and outputting pump light; the MEMS atomic cell is used for modulating and transferring the other beam of laser based on the pump light to obtain a probe spectrum; a photoelectric detector is used for converting the detected probe spectrum into an electric signal; a high-speed servo feedback control integrated circuit is used for converting the received electric signal into a feedback control signal, inputting the feedback control signal into a feedback control port of the on-chip narrow-line-width laser, realizing full-bandwidth locking, and outputting an optical clock signal. The above-designed chip optical clock has small integration difficulty and is easy to realize full-chip optical clock.

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.

A device (104) comprises a U-shaped cell (206, 208) configured to contain a quantum gas, a first waveguide (214) coupled to an inlet (213) of the U-shaped cell, and a second waveguide (216) coupled to an outlet (215) of the U-shaped cell. The device also comprises a multi-layer substrate (218) including transmitter and receiver antennas that are aligned with the first and second waveguides, respectively, the substrate including a network of metal layers coupled to the transmitter and receiver antennas. The device also includes transmitter and receiver dies coupled to the transmitter and receiver antennas, respectively, by way of the network of metal layers, the substrate positioned between the U-shaped cell and the transmitter and receiver dies.

The embodiment of the invention discloses a CPT atomic clock circuit system. The system comprises a controller used for sending a first control signal to an integrated microwave source, sending a second control signal to an integrated temperature controller, collecting the current temperature of a CPT atomic clock physical system, and sending a third control signal to the CPT atomic clock physical system according to the current temperature of the CPT atomic clock physical system; the integrated microwave source is used for sending a microwave signal to the CPT atomic clock physical system according to the first control signal; the integrated temperature controller is used for collecting the current temperature of the laser, controlling the laser to work at a first preset temperature according to the second control signal and the current temperature of the laser, and sending a laser signal to the CPT atomic clock physical system; and the CPT atomic clock physical system is used for working at a second preset temperature according to the third control signal and outputting a laser feedback signal according to the microwave signal and the laser signal.