46 results about "Atom interferometer" patented technology

This invention relates to a Bragg light generation system and method suitable for Bragg-type atomic interferometers. The system includes: a laser for generating a first laser beam with a frequency in a preset atomic absorption peak band; an optical circulator for propagating the first laser beam to a cascaded acousto-optic modulator and receiving two third laser beams returned from the cascaded acousto-optic modulator; a cascaded acousto-optic modulator for diffracting the first laser beam into two second laser beams with opposite propagation directions through Bragg diffraction of two acousto-optic crystals; an optical assembly for performing secondary diffraction on the two second laser beams and reflecting the two mutually perpendicular second laser beams to the cascaded acousto-optic modulator; and an output module for splitting and sampling the two third laser beams and modulating the sampled third laser beams into Bragg laser beams in the target frequency band. This invention reduces the path separation of the two Bragg laser beams by using a quasi-common optical path, thereby reducing phase noise and improving measurement accuracy.

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 invention relates to a light reflector element having several reflector surfaces which are aligned at an angle to a predefined direction of light incidence of the light reflector element, wherein the reflector surfaces can be arranged ring-shaped around a center of the light reflector element at a uniform angular distance to each other, wherein the reflector surfaces are arranged opposite each other with respect to the center of the light reflector element, so that light incident in the direction of light incidence (L) is deflected by the reflector surfaces into light rays which run towards each other in different spatial directions and meet in a central axis which runs through the center in the direction of light incidence. The invention further relates to a reflector arrangement with at least two such reflector elements and a quantum gradiometer. In general, the invention relates to the field of atom interferometers, in particular with magneto-optical traps (MOTs). In particular, the invention relates to atom interferometric gravimeters and gradiometers formed therewith.

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.

Provided is an apparatus and method in which, in a first region that traps atoms in a first state by a first light and a magnetic field, atoms are optically pumped into a second state and thereby trapped by magnetic force. The atoms in the second state trapped in the first region are moved from the first region to a second region by force of gravity or the radiation pressure from second light. In the second region, the second light is radiated on the atoms in the second state, and the atoms in the second state are thereby cooled. The atoms are optically pumped into a third state that is insensitive to magnetic fields and thereby released from a magnetic trap and transported to a post device by a moving optical lattice or an optical dipole guide.

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.

This invention discloses a two-component atomic interferometer for large momentum transfer based on four-wave dual-diffraction Raman spectroscopy. It includes a vacuum system, within which cold atomic clusters comprise two components. First, second, and third Raman lasers incident on the vacuum system constitute the Raman light of the first component, while first, second, and fourth Raman lasers constitute the Raman light of the second component. Frequency variations in the third and fourth Raman lasers compensate for the Doppler frequency shift caused by the difference in recoil velocity during the large momentum transfer of the two atomic components. This invention utilizes the insensitivity of the two-component atomic interferometer to the third frequency of the Raman laser. By independently adjusting the frequency of the non-shared lasers of the two-component atomic interferometer, it achieves large momentum transfer in the two-component atomic interferometer while ensuring common-mode suppression of phase noise in the two-component atoms, and without limiting the number of recoil photons by the Doppler frequency shift difference, thus improving the accuracy of differential measurements.

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 discloses a gravity and gravity gradient integrated measuring device and method based on atomic interference, and the measuring device comprises a Raman laser emitter and a structural framework. Raman laser emitted by the Raman laser emitter passes through an upper atomic interferometer and a lower atomic interferometer in sequence and then is vertically incident on a Raman laser reflector. The bottom of the Raman laser reflector is fixedly connected with the top of a seismometer through an adapter, and the structural framework is installed on a rotating platform. The measuring method comprises the following steps: firstly, the orientation angles corresponding to the maximum value and the minimum value of the gravity gradient are determined; at a new measuring point, the orientation angle of the measuring device is adjusted to the orientation angles corresponding to the maximum value and the minimum value of the gravity gradient; the original gravity measurement value of the upper atomic interferometer, the original gravity measurement value of the lower atomic interferometer and the original measurement value of the gravity gradient are obtained and corrected. The measuring repeatability problem caused by the Coriolis error in the measuring process is effectively solved.

In this magneto-optical trap device, five laser beams are irradiated in a trap space in which atoms are trapped. Of the five laser beams, three laser beams (laser beams a1, a2, a3) pass through the inside of the same plane (Z plane) and are irradiated in the trap space. The two laser beams that intersect that plane (laser beams a4, a5) are irradiated in the trap space. The laser beam a1 is used together as a slowing laser beam b for Zeeman slower.

An atomic interferometer has a laser light source, by which first laser light can be emitted at a base frequency, and has at least one light emission device, by which second laser light can be emitted at a frequency which deviates by a differential frequency from the base frequency. The atomic interferometer has an atom trap in which one or more atomic ensembles can be trapped and irradiated using the first and the second laser light.

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.

An atom beam generation device (100) comprises an atomic oven (102) including a reservoir (106) in which a sample (114) is contained, a deceleration unit (104), and coil units (110, 124). The deceleration unit (104) includes a bore (122) through which an atomic beam and a slowing laser beam (128) pass, and decelerates an atomic beam emitted from the atomic oven (102) by means of slowing laser beam and a magnetic field. The coil units (110, 124) supply Joule heat to the atomic oven (102), and generate a magnetic field in the deceleration unit (104).

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 invention provides a laser frequency hopping performance detection device, method and system and a cold atom interferometer, and belongs to the technical field of quantum measurement, the detection device comprises a reference laser, a high-speed photoelectric detector, a frequency discriminator, a reference frequency source, a PID controller, a voltage acquisition card and a microprocessor; the input end of the high-speed photoelectric detector is connected with the reference laser and the to-be-locked laser, and the to-be-locked laser outputs to-be-frequency-locked laser. The PID controller is connected with the to-be-locked laser, generates a voltage feedback signal and inputs the voltage feedback signal to a voltage control end of the to-be-locked laser; and the microprocessor is connected with the voltage acquisition card and the reference frequency source, and determines the frequency hopping speed of the laser to be locked according to the linear relationship between the frequency change of the laser to be locked and the voltage feedback signal. According to the detection device, in a field environment, the voltage feedback signal can be directly acquired through the voltage acquisition card to analyze the frequency hopping performance of the laser to be locked, the scheme is simple and easy to implement, and detection equipment such as a frequency counter does not need to be carried.

According to the present invention, atoms are trapped by a quadrupole magnetic field formed by ring-shaped magnets and three sets of laser beam pairs. A portion of the laser beam pairs is partially blocked by the ring-shaped magnets, , so that a region which is a non-atom trap space is formed inside an intersecting region where the three groups of laser beam pairs cross. The inside of the intersecting region is irradiated with a laser beam so that atoms within the non-atom catch space are extracted from the intersecting region.