28 results about "Atom interferometer" patented technology

The present disclosure relates to an inertial sensor for measuring an amount of inertia along a sensing axis. The sensor includes an atom interferometer including a pulse generator for generating one or more pulsed light beams defined by respective pulse durations to place atoms in superposition and recombine the atoms to measure interference of the atoms, the one or more pulsed light beams being configured to generate one or more pulsed light beams, the one or more pulsed light beams being defined by respective pulse durations, the one or more pulsed light beams being defined by respective pulse durations, and the one or more pulsed light beams being defined by respective pulse durations, the one or more pulsed light beams being defined by respective pulse durations. And calculating the amount of inertia based on the measured interference. The sensor further includes an auxiliary acceleration sensor configured to measure acceleration transverse to one or more of the pulsed light beams; and a control system configured to calculate a lateral offset of the atoms relative to the pulsed light beam caused by the measured acceleration transverse to the one or more of the light beams, increase the pulse duration, and adjusting the pulse timing to compensate for a reduced beam strength applied to the atoms due to the lateral offset.

The application discloses a method for measuring a detection tilt angle of a two-component atomic shearing interferometer, constructs a tilt angle set of a swing angle device; the angle of a mirror is turned between the time when atoms are subjected to the action of a pi Raman laser and a second pi / 2 Raman laser; a plurality of groups of odd number and even number are alternately detected; all tilt angles in the tilt angle set are traversed; and the actual included angle of the longitudinal direction of a CCD camera imaging surface relative to the Z-axis direction is calculated by fitting. The application also discloses a measuring device for the detection tilt angle of the two-component atomic shearing interferometer. The application enables the current atomic shearing interferometer to accurately measure the tilt angle of the detection system, thereby solving the problems of noise and system error caused by the non-zero return of the tilt angle of the detection system of the atomic shearing interferometer, and suppressing the drift of the differential measurement of the two-component atomic interferometer caused by the change of the tilt angle.

An electronic state splitter for atoms comprises an atom supplier, an atom movement path, a probe laser source, and a magnetic field generator. The atom supplier supplies atoms moving at a constant velocity along the atom movement path. The probe laser source supplies a probe laser propagating in the atom movement path in the same direction as or opposite to the motion of the atoms on the same axis as the atom movement path. The magnetic field generator generates a magnetic field orthogonal to the atom movement path in the atom movement path to mix the wave function of the clock upper state with the electronic state allowing electric dipole transitions, allowing pulsed excitation of clock transitions by the probe laser uniform in time and space. Accordingly, continuous spectroscopy of atomic transitions and frequency control of the probe laser are possible, which improves the stability of the atomic clock.

The application relates to a Raman laser carrier sideband ratio feedback control system and a control method thereof. The system is used for controlling an IQ modulator of a cold atom interferometer laser system. The control system comprises an F-P resonant cavity, which is used for receiving Raman laser output by the IQ modulator, and simultaneously adjusting the cavity length of the F-P resonant cavity in real time, so as to identify and output transmitted light of different frequency components to a photoelectric detector. The photoelectric detector is used for detecting the transmitted light of different frequency components, so as to output intensity signals of different frequency components to a calculation module. The calculation module is used for collecting the intensity signals of different frequency components, and calculating and outputting the Raman laser carrier sideband ratio to a feedback control module. The feedback control module is used for performing error feedback control on the IQ modulator according to the Raman laser carrier sideband ratio and a preset carrier sideband ratio expected value, so as to realize the locking control of the Raman laser carrier sideband ratio. The application can improve the measurement accuracy and long-term stability of the cold atom interferometer laser system.

The invention relates to a method in which at least one ensemble of atoms is prepared in an output coupling state (Z1) and, by means of coherent control interventions acting on the at least one ensemble of atoms in an atom interferometer input state that is the same as or, after the application of further manipulation steps, different from the output coupling state (Z1), is changed into subsequent states different from the atom interferometer input state, and a matter-wave interferometry sequence, which may in particular have several loops, is carried out with the at least one ensemble of atoms. The invention further relates to an atom interferometer configured for carrying out such a method and to a computer program for carrying out such a method.

The invention relates to a method for controlling and implementing an atom interferometer, in which at least one ensemble of atoms is prepared in an out-coupling state, wherein the out-coupling state describes the state after cooling procedures and / or other preparation steps or generally the state before the following steps, in which the at least one ensemble of atoms is then transferred to a transfer state different from the out-coupling state by a transfer control intervention, in which the at least one ensemble of atoms is subsequently transferred to an atom interferometer input state by at least one relaunch control intervention, in which a matter-wave interferometry sequence is then carried out with the at least one ensemble of atoms by means of coherent control interventions acting on the at least one ensemble of atoms.The invention also relates to an atom interferometer configured to carry out such a method, and to a computer program for carrying out such a method.

The invention relates to an atom interferometer with a laser light source through which first laser light can be emitted at a fundamental frequency, and with at least one light emission device through which second laser light can be emitted at a frequency that deviates from the fundamental frequency by a difference frequency, and with an atom trap in which one or more atom ensembles can be captured and irradiated with the first and the second laser light.

The utility model belongs to the field of atom inertia measurement, and particularly discloses an auxiliary device for evaluating the Coriolis force of an atom interferometer, the auxiliary device comprises a lifting rotation supporting module and an inclination detection adjusting module, and the inclination detection adjusting module comprises an inclination detection unit and an inclination adjusting unit; the inclination detection unit is used for detecting the inclination of the vacuum container; the inclination adjusting unit is located at the bottom of the vacuum container and used for supporting the vacuum container and adjusting the vacuum container to be horizontal according to the inclination. The lifting rotation supporting module can be coaxially arranged under a vacuum container of the atom interferometer and can drive the vacuum container to rotate so as to modulate the Coriolis force. According to the invention, the effect of rotating the vacuum container in the atom interferometer with high efficiency and high precision can be realized.

The application relates to the technical field of atomic interference, and provides an atomic interference gravity measurement method with optical cavity assistance and a device thereof, so as to solve the problem that existing atomic interferometers face laser power consumption limitation no matter whether the atomic interferometers are commercialized or the precision of the atomic interferometers is continuously improved. The method comprises the following steps: constructing an optical cavity, wherein the optical cavity comprises a first cavity mirror for coupling Raman light, a second cavity mirror for focusing Raman light and a third cavity mirror for reflecting Raman light which are sequentially spaced, a first waist spot exists between the first cavity mirror and the second cavity mirror, a second waist spot exists at a position after the second cavity mirror focuses, the second waist spot is used for detecting a cavity field mode of the optical cavity through transmission light of the third cavity mirror, and the first cavity mirror, the second cavity mirror and the third cavity mirror are coaxial and constitute a standing wave loop of the optical cavity; and a vacuum cavity is arranged between the first cavity mirror and the second cavity mirror, and cold atom groups are prepared at the first waist spot where the vacuum cavity is located.

The application provides a kind of applied to 87 The all-fiber laser optical path system of Rb cold atom interferometer includes a plurality of fiber amplifiers, a plurality of fiber acousto-optic modulators, a plurality of fiber beam combiners, a plurality of fiber beam splitters, a fiber frequency doubling waveguide and a beat frequency phase-locked servo module. Through the all-fiber laser optical path system, different frequency lasers required by the Rb cold atom interferometer can be generated 87 The all-fiber laser optical path system not only can replace the complex laboratory laser optical path system of the cold atom interferometer, but also has smaller volume, stronger environmental adaptability, higher reliability and simpler process, and can meet the requirements of various functional lasers of the Rb cold atom interferometer 87 Therefore, the all-fiber laser optical path system can be used as an important component of the miniaturization, integration, modularization and engineering of the laser optical path of the Rb cold atom interferometer 87 Therefore, the all-fiber laser optical path system can be used as an important component of the miniaturization, integration, modularization and engineering of the laser optical path of the Rb cold atom interferometer

This application belongs to the field of atomic interferometry precision measurement, specifically disclosing a method and apparatus for atomic interferometry based on dual optical tweezers guidance. This application achieves efficient segmentation by employing dual optical tweezers for initial state preparation and beam splitting of the initial cold atomic clusters, reducing the heating and decoherence effects associated with traditional methods. By controlling the optical tweezers to guide the two atomic clusters along a non-overlapping, tightly wound path, interaction and decoherence are avoided, while the extended movement distance enhances phase accumulation and improves interference sensitivity. Subsequently, atomic interference is achieved by combining the optical tweezers beams, ensuring stable interference fringes and improving measurement accuracy. Finally, the combined atomic clusters are used iteratively as the initial atomic clusters, reducing repeated preparation time and effectively increasing the sampling rate. Compared with existing technologies, this method improves the sampling rate and measurement sensitivity while reducing heating and decoherence, thus solving the problems of limited heating, decoherence, and sampling rate in atomic interferometers and significantly enhancing measurement capabilities.

The invention relates to a method for controlling an atom interferometer, in which at least one ensemble of atoms is prepared and provided in an atom interferometer input state, and the state of this ensemble is changed to subsequent states different from the atom interferometer input state by means of coherent control interventions acting upon it, and a matter-wave interferometry sequence is performed with this ensemble. The invention further relates to an atom interferometer configured to carry out such a method, and to a computer program.

The atomic electronic state separator (1) of the present invention includes: an atomic supply unit (11), an atomic movement path (12), a probe laser source (13), and a magnetic field generating unit (M). The atomic supply unit (11) supplies atoms that move in the atomic movement path (12) at a certain speed. The probe laser source (13) supplies a probe laser that propagates coaxially with the atomic movement path (12) in a direction opposite to or the same as the direction of atomic movement. The magnetic field generating unit (M) generates a magnetic field orthogonal to the atomic movement path (12) in the atomic movement path (12) and mixes it with the wave function of the electronic state that allows electric dipole transitions, thereby enabling pulse excitation of clock transitions based on the same probe laser in time and space. Alternatively, a magnetic shielding member can pulse excite clock transitions by shielding the magnetic field applied in the atomic movement path (12) and spatially changing the Zeeman frequency shift, thereby enabling pulse excitation of clock transitions by the same probe laser in time and space. As a result, it is possible to continuously perform spectral analysis of atomic transitions and frequency control of the detection laser, thereby improving the stability of the atomic clock.

The adjusting device (500) sets M to a predetermined integer satisfying 3 ≤ M, and simultaneously irradiates the atomic beam (131) with M lasers. The respective traveling paths of the M lasers intersect the traveling path of the atomic beam (131). The component in the direction perpendicular to the traveling path of the atomic beam of the sum of the respective radiation pressure vectors of the M lasers is zero. The component in the direction of the traveling path of the atomic beam of the sum of the respective radiation pressure vectors of the M lasers is negative with respect to an atom having a speed greater than a prescribed speed, and is positive with respect to the atom having a speed smaller than the prescribed speed.

The invention provides a method and device for determining a phase invariant point of an atom interferometer, and the method comprises the steps: carrying out the simulation collection of the atom interferometer at different evolution times, obtaining interference fringes, carrying out the fitting of the phase of each interference fringe, and obtaining a fitting phase; the method comprises the following steps: fitting a Raman light chirp rate corresponding to a phase as a possible phase invariant point, performing periodic expansion on the chirp rate within a certain range to obtain a chirp rate array corresponding to corresponding evolution time, setting a corresponding pointer for selecting the chirp rate for each chirp rate array, chirp rates selected by all chirp rate arrays are used as array individuals, the range of the array individuals is calculated, multi-round iteration is carried out, in each round of iteration, selection of the chirp rates is adjusted by changing a pointer, a new array individual is obtained, and after multi-round iteration, the chirp rates of all the chirp rate arrays are obtained. Taking the chirp rate corresponding to the array individual with the minimum range as a phase invariant point of the atomic interferometer; through the iteration, the problem of insufficient precision of traditional manual search is solved, and the search efficiency is improved.

The invention discloses an atom interferometer which comprises a vacuum cavity assembly, an interference area magnetic field assembly and a Raman laser input mirror group which are sequentially connected above the vacuum cavity assembly, and further comprises a Raman laser reflecting mirror group arranged below the vacuum cavity assembly, an atomic signal detection assembly is arranged between the interference area magnetic field assembly and the vacuum cavity assembly, and the vacuum cavity assembly is provided with a plurality of optical light-passing windows; the invention further discloses a large vibration amplitude measuring method. According to the invention, the autonomous measurement capability of the atom interferometer in a large vibration environment can be improved, and the application range of the atom interferometer in a dynamic environment and a severe environment is expanded.

The invention relates to an atom interferometer with a laser light source through which first laser light can be emitted at a fundamental frequency, and with at least one light emission device through which second laser light can be emitted at a frequency that deviates from the fundamental frequency by a difference frequency, and with an atom trap in which one or more atom ensembles can be captured and irradiated with the first and the second laser light.

The application discloses a method and equipment for extracting same-frequency aliasing signals in a shear atomic interferometer. The same-frequency aliasing interference signals to be fitted are regarded as simple harmonic signals, fitted effective contrast and fitted effective phase are obtained based on the simple harmonic signals, and the contrast prior value of the first atomic interference signal and the contrast prior value of the second atomic interference signal are obtained by inversion. The same-frequency aliasing interference signals to be solved are regarded as simple harmonic signals, the measured effective contrast and the measured effective phase are obtained based on the simple harmonic signals, the absolute value of the phase deviation of the first atomic interference signal to be solved and the second atomic interference signal to be solved is calculated, and the phase of the first atomic interference signal to be solved and the phase of the second atomic interference signal to be solved are calculated. The application can reconstruct the atomic interference signals from the same-frequency aliasing interference signals to be solved, realizes the restoration of the original signals, and realizes the accurate separation of the atomic interference signals.

The adjusting device (500) sets M to a predetermined integer satisfying 3 ≤ M, and simultaneously irradiates the atomic beam (131) with M lasers. The respective traveling paths of the M lasers cross the entry path of the atomic beam (131). The component in the direction perpendicular to the entry path of the atomic beam of the sum of the respective radiation pressure vectors of the M lasers is nonzero. The component in the direction of the entry path of the atomic beam of the sum of the respective radiation pressure vectors of the M lasers is negative with respect to an atom having a speed greater than a prescribed speed and is positive with respect to the atom having a speed less than the prescribed speed.

The present application belongs to the field of precision measurement, and particularly discloses a method for measuring the transverse temperature of an atomic group in an atomic interferometer. The present application first controls the size of the atomic group at the moment of acting on the Raman light pulse by adjusting the opening time, and then performs a Rabi oscillation experiment under different atomic group sizes. Then, the experimental data are fitted with a trigonometric function, and the key parameters reflecting the transverse temperature are extracted therefrom. Finally, the transverse temperature of the atomic group is obtained by inversion calculation. The method is based on the Gaussian distribution of the atomic group density and the Raman light intensity in the transverse space, and the coupling result of the two is the non-uniformity of atomic transition in the transverse space, thereby affecting the average transition probability of the whole atomic group, i.e. the linearity of the Rabi oscillation curve. Conversely, the linearity of the Rabi oscillation of the atomic group contains the transverse parameters of the atomic group, and the transverse parameters of the atomic group are extracted from the linearity of the Rabi oscillation. The present application can be completed only by relying on the atomic interferometer itself, and has low requirements for equipment, simple process and easy operation.

The invention discloses a normal-stable Raman laser reflector vibration isolation system, which comprises a Raman laser reflector and a reflector which are arranged above a vibration isolation table, and a four-quadrant photoelectric detector arranged above the reflector, the piezoelectric ceramic is arranged between the vibration isolation table and the Raman laser reflector and is used for controlling the posture of the Raman laser reflector; the piezoelectric ceramic and the four-quadrant photoelectric detector are respectively connected with a normal feedback control module; the invention further discloses a control method. According to the invention, the problem of normal drift of the Raman laser reflector caused by attitude drift of the vibration isolation table in the cold atom interferometer is solved, and the environmental vibration adaptability of the cold atom interferometer is improved; by improving the normal stability of the Raman laser reflector, the long-term drift of the measurement result of the cold atom interferometer is greatly reduced, and the measurement precision is improved.

The invention provides a high-aspect-ratio light beam generation device for atom interference. The high-aspect-ratio light beam generation device comprises a laser, and an optical fiber collimator, a deformation prism pair, a first plano-convex cylindrical lens, a second plano-convex cylindrical lens and a plane mirror which are sequentially arranged along a light path, laser emitted by the laser is collimated by the optical fiber collimator to form a Gaussian beam; the deformation prism pair is used for carrying out one-way beam expansion on the Gaussian beam in a first direction; the first plano-convex cylindrical lens is used for focusing the expanded light beam in a second direction to form a high aspect ratio light spot; the second plano-convex cylindrical lens is used for collimating the focused light beam, and the plane mirror is used for reflecting the collimated light beam, so that the reflected light beam returns along an original light path and is focused again through the second plano-convex cylindrical lens, and the reflected light beam coincides with the waist of the incident light beam to form a standing wave light beam. The device can stably and reliably generate an ideal Raman light field for atom interference, and provides technical support for improving the measurement precision and practicability of an atom interferometer.

The invention belongs to the field of laser frequency control, and particularly discloses a Bragg light generation system and method suitable for a Bragg atom interferometer. According to the application, the two radio frequency driving sources are combined and amplified to generate the amplified signal containing two radio frequency components, and the amplified signal is used as the driving source of the acousto-optic modulator, so that Bragg light with two frequencies can be generated by only using one acousto-optic modulator. Light path multiplexing is achieved, Bragg light is always located in the same path in the transmission process, phase noise introduced by path separation can be greatly suppressed in a common mode, the whole light path does not need to be actively subjected to phase locking, and the whole device is simple in structure, high in integration level, good in stability and high in anti-interference capacity.

The invention belongs to the field of atom interference measurement devices, and particularly discloses an internal and external state dual-mode atom interferometer device which comprises a vacuum shell. The atom preparation module, the dual-mode optical pulse preparation module, the atom interference module and the atom detection module are arranged in the vacuum shell, and the atom preparation module is used for preparing atoms required by atom interference; the dual-mode optical pulse preparation module is used for outputting Raman optical pulses or Bragg optical pulses; and the atom interference module is used for receiving the atoms prepared by the atom preparation module and the Raman optical pulse or the Bragg optical pulse output by the dual-mode optical pulse preparation module, controlling the internal state of the atoms by using the Raman optical pulse to perform atom interference, and controlling the external momentum state of the atoms by using the Bragg optical pulse to perform atom interference. Through the structural design of the invention, measurement can be carried out in the same interferometer device and the same interference space by using different beam splitting principles, and the application range of the device and the accuracy of a measurement result are improved.

The invention discloses a stripe locking device and method for an atom interferometer, and the device comprises a light splitting and shaping device with a Raman light source, a 1 / 4 wave plate and a Raman light reflector, and also comprises a phase delay plate which is installed on a rotating table, and three beams of Raman pulses from left to right are transmitted forwards through the light splitting and shaping device; the two beams of Raman pulses on the two sides enter the Raman light reflecting mirror through the 1 / 4 wave plate, and the middle Raman pulse enters the 1 / 4 wave plate through the phase delay plate and then reaches the Raman light reflecting mirror; the invention further discloses a stripe locking method. Under the condition of a single Raman light source, stripe locking of the two atom interferometers is achieved, a rotation angular velocity phase is fed back and compensated by adjusting the phase of the Raman light laser source, and an acceleration phase is fed back and compensated by adjusting the phase delay plate.

A method and a system for generating single-sideband Raman light for cold atom interferometer through phase modulation are provided. The system includes a laser, an electro-optic modulator (EOM), a local microwave oscillator, a narrow-bandwidth optical-fiber filter, an optical-fiber power amplifier and a frequency doubling crystal. The laser has frequency of ω and is input to the EOM. The local microwave oscillator applies a modulation voltage with frequency of δ to the EOM and generate double-sideband frequency-modulated light with frequencies of ω±nδ(n=0,1,2, . . . ). This light is filtered by the narrow-bandwidth optical-fiber filter, which outputs the target frequency light and is successively input to the optical-fiber power amplifier and the frequency doubling crystal and yields the single-sideband Raman light for cold atom interferometer. The Raman light generation system has simple structure, low-cost, high integration level, easy implementation, high maturity and good stability, and has practical significance in realizing an engineering-based laser system for high-precision atom interferometer measurement.

The invention discloses a low-power-consumption and high-environment-adaptability optical device for an atom interferometer, and belongs to the technical field of quantum precision measurement. The device comprises a laser generation unit 10, an optical amplification unit 20, a frequency locking unit 30 and a laser output unit 40. Laser generated by the laser generation unit 10 is amplified by the optical amplification unit 20 and then divided into two paths, one path is distributed to the frequency locking unit 30 to lock the laser frequency of the laser generation unit, and the other path is output to the laser output unit 40 to generate laser with different frequencies and powers required in the atomic interference process. The problems of high power consumption, low environmental adaptability and the like of a traditional optical system can be solved, meanwhile, laser with the frequency and power required by the atom interferometer can be provided, and the reliability of the optical system is improved.

This invention discloses a gravity vector measurement device based on a point-source atomic interferometer, comprising a point-source atomic interferometer mounted on a carrier. The output optical paths of the cooling laser source, the Raman laser source, and the detection laser source in each coordinate axis direction are coupled to an optical fiber in the corresponding direction. The laser beams output from the optical fibers sequentially pass through laser collimators and liquid crystal phase delayers in the corresponding directions before being incident into the vacuum cavity of the point-source atomic interferometer. This invention also discloses a gravity vector measurement method based on a point-source atomic interferometer, utilizing a single point-source atomic interferometer to perform attitude calculation and tilt compensation of the carrier in real time through integrated angular velocity. This invention overcomes the dependence of traditional dynamic gravity measurement on a mechanical inertial stabilization platform, achieving dynamic measurement of the gravity vector using a single quantum sensor and its algorithm. It has the advantages of simple system structure, small size, low cost, and high reliability.