28 results about "Magneto-optical trap" patented technology

The invention relates to the field of cold atom physical precision experiments, in particular to a high-collimation and low-power-consumption stable atomic furnace. Comprising a heat shielding cover, a transmitting tube is installed at the bottom of the heat shielding cover, one end of the transmitting tube located in a cavity is connected with a collimator through a connecting piece II, the outer side of the collimator is wound with a heating wire II, and the upper end of the collimator is connected with an atomic container; the outer sides of the atom container, the collimator and the connecting piece II are jointly sleeved with a heating layer, and a heating wire I is wound on the outer wall of the heating layer; three shielding layers are sequentially arranged in a cavity between the heating layer and the heat shielding cover from inside to outside; according to the invention, the atomic flux is ensured, the divergence angle and speed distribution of the emitted atoms are enabled to be within the capture range of the magneto-optical trap to a large extent, and the collimation of the atomic furnace is improved; the design of three heat shielding layers and the heat shielding cover is adopted, high polishing treatment is carried out on the heat shielding layers and the heat shielding cover, heat loss is reduced, temperature fluctuation stability is improved, power consumption is reduced, and stability is improved.

The invention relates to the technical field of optical atomic clocks, and discloses a multi-mode magnetic field generation and regulation device and method for a strontium atom optical clock, and the device comprises a three-dimensional magnetic field coil, a magnetic field control system, and a magneto-optical trap. The three-dimensional magnetic field coil comprises an X-direction magnetic field coil, a Y-direction magnetic field coil and a Z-direction magnetic field coil; the X-direction magnetic field coil, the Y-direction magnetic field coil and the Z-direction magnetic field coil are mutually orthogonal and are respectively arranged along opposite positions to form a cubic framework, and the magneto-optical trap is positioned in the cubic framework; the magnetic field control system is electrically connected with the X-direction magnetic field coil, the Y-direction magnetic field coil and the Z-direction magnetic field coil. The technical problems that an existing strontium atom optical clock system is complex in structure and high in power consumption and thermal load, and time sequence characteristics used by a magnetic field in the operation process of the optical clock are not fully utilized are solved.

The invention discloses an integrated cold atom gravity measurement system based on a grating magneto-optical trap chip. The system mainly comprises an ion pump, a metal vacuum cavity, a transparent ultrahigh vacuum cavity, the grating magneto-optical trap chip, a chip fixing frame, an atom source and a matched light path assembly. In order to solve the problems that an existing three-dimensional magneto-optical trap system is complex in structure and low in integration level, a plane grating magneto-optical trap chip is introduced, the system configuration is effectively simplified, the space utilization rate is improved, and the atom capturing efficiency and purity are remarkably improved. The system has obvious advantages in atomic control performance and integration degree, specifically, efficient cooling and capturing, low power consumption, low noise and good detection performance, and an advanced solution is provided for realizing high-precision and miniaturized gravity measurement.

The application provides a quantum space-time reference integrated measurement device, method and system, wherein the device comprises a detection device and a control terminal, the detection device comprises a magnetic shielding cylinder, a magneto-optical trap cavity is arranged in the magnetic shielding cylinder, and different functional areas are integrated in the magneto-optical trap cavity; the functional areas comprise: a cooling cavity, wherein a cooling light and a pumping light are arranged; a microwave cavity, which is used for performing Ramsey first-order interference on a cold atom group after initial state preparation to obtain a frequency error signal between a local oscillator output frequency and a standard frequency; a second-order interference area, which is arranged vertically below an atom free-fall outlet of the microwave cavity and is used for performing M-Z second-order interference; a detection area, which is arranged at the end of the detection device and is connected with the second-order interference area; and the control terminal is in communication connection with the detection device. The application can realize synchronous measurement of time and space references, reduce reference transmission error and equipment cost of the device, and improve the test efficiency of space-time reference information.

The invention discloses a Raman grating magneto-optical trap gravimeter realized by pulse laser. The Raman grating magneto-optical trap gravimeter comprises a central controller, a coherent laser generator and a grating magneto-optical trap gravimeter, the central controller controls the coherent laser generator and is used for outputting control voltage so as to control operation of the seed light laser, the optical fiber electro-optical modulator, the pulse laser generator, the multi-stage optical fiber amplifier and the optical fiber acousto-optic modulator. The seed light laser outputs continuous laser to be injected into the optical fiber electro-optical modulator; the optical fiber electro-optical modulator adopts a radio frequency signal to modulate input continuous laser and then injects the continuous laser into the pulse laser generator; the pulse laser generator continuously converts laser into short-pulse laser and injects the short-pulse laser into the multi-stage optical fiber amplifier; a frequency doubling crystal after short pulse laser amplification; frequency is increased and converted into the required laser wavelength, the laser wavelength is injected into the optical fiber acousto-optic modulator, and the output of the optical fiber acousto-optic modulator is injected into the grating magneto-optical trap gravimeter. The device is simple in structure and low in cost, and the research, development, production and application cost of the device is reduced.

Quantum memory The invention relates to an assembly (11) for a quantum memory (10), the quantum memory (10) being suitable to store and retrieve a quantum information encoded into an optical signal, the assembly (11) being deprived of optical cavity and comprising: - a vacuum chamber (12), - a neutral atoms source (14) suitable to generate neutral atoms in the vacuum chamber (12), and - a magneto-optical trap generator (16) suitable to generate an elongated magneto-optical trap enabling to trap neutral atoms in the vacuum chamber (12) so as to obtain an elongated ensemble of neutral atoms elongated along a so-called elongation axis, the elongation axis being along a vertical direction, the optical signal being intended to propagate in the vacuum chamber (12) along the elongation axis, the quantum information being stored in the elongated ensemble of neutral atoms or being retrieved from the elongated ensemble of neutral atoms depending on a control signal.

The invention relates to an injection laser automatic frequency stabilization device and method based on cold atom imaging feedback. The device comprises a primary cooling light path, a secondary cooling light path, a charge-coupled device and a control module. The first-stage cooling light path and the second-stage cooling light path are used for outputting single longitudinal mode laser by using the seed laser, injecting the single longitudinal mode laser into the plurality of injection lasers and then outputting cooling laser into the vacuum system; the charge-coupled device is used for acquiring a cold atom cloud image in the magneto-optical trap of the vacuum system in real time; the control module is used for automatically locking the plurality of injection lasers to a single longitudinal mode state according to the brightness of the cold atom cloud image and a preset sequence; and according to the brightness change of the cold atom cloud image, judging the injection laser which is unlocked and re-locking the injection laser. The problems that a traditional injection locking system is large in size, insufficient in automation, dependent on manpower, poor in environmental adaptability and the like are 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.

The invention discloses a compact double-magneto-optical trap device which is composed of a main frame, a glass vacuum cavity, a collimation assembly, a left magneto-optical trap, a right magneto-optical trap and the like. The structural sizes of the left magneto-optical trap and the right magneto-optical trap are reduced by improving the mounting mode of a collimator and a coil; the projection inclination angle is designed to ensure that the atomic group is projected to the center of the opposite magneto-optical trap to improve the repeated trapping efficiency of the atomic group; the invention further discloses an adjustment alignment device and an adjustment alignment method of the compact double-magneto-optical trap device, the optomagnetic coincidence precision is improved by introducing the metal hexahedron, the cooling temperature of an atomic group is further reduced, and finally the portable, compact and stable double-magneto-optical trap device is achieved.

A loading assembly for providing atomic objects to a confinement apparatus is provided. The loading assembly includes an oven configured to generate an atomic flux of an atomic species / isotope having a non-zero nuclear spin. The loading assembly includes mirror and magnet arrays configured to, when optical beams are provided to the arrays, generate a two-dimensional magneto-optical trap (2D MOT) with a simplified repumping scheme. The 2D MOT is configured to generate a substantially collimated atomic beam from the oven generated atomic flux.

The invention relates to the field of neutral atom quantum computing, in particular to a three-dimensional magneto-optical trap system and a using method thereof. The three-dimensional magneto-optical trap system comprises a magnetic field adjusting assembly, a coil framework, a magneto-optical trap adjusting assembly and a supporting assembly. The magnetic field adjusting assembly is arranged above the coil framework, a vacuum cavity is formed in the coil framework, and the position of a magnetic field zero point in the vacuum cavity can be adjusted by adjusting the relative position of the magnetic field adjusting assembly and the coil framework, so that the center of a light path coincides with the magnetic field zero point to cool atoms; optical tweezer array light beams are received in the vacuum cavity through the strong focusing lens, the optical tweezer array is used for capturing and trapping cooled atomic groups to form a cold atom array, the magneto-optical trap adjusting assembly is arranged on the supporting assembly, and the positions of the cold atomic groups can be adjusted by adjusting the relative positions of the magneto-optical trap adjusting assembly and the supporting assembly. The center of the cold atomic group is enabled to coincide with the focus of the optical tweezers array, and the adjustment range and precision are optimized through the system.

The application relates to a method for improving the frequency measurement precision of an optical lattice clock in a microgravity environment, which comprises the following steps: two beams of lattice light are divided from one lattice light laser, each beam of lattice light is further divided into two beams of lattice light, and four beams of lattice light form two one-dimensional horizontal optical lattices; wherein the waist positions of the two one-dimensional horizontal optical lattices have a certain interval in the vertical direction, and the midpoint position is the position of the magnetic field zero point in the magneto-optical trap; the projections of the axial directions of the two horizontal optical lattices in the vertical plane are parallel to each other, and the projections in the horizontal plane are perpendicular to each other; an acousto-optic modulator with the same parameters is loaded on the light path of each beam of lattice light, and is used for linear frequency shift and modulation of the lattice light frequency; two clock laser beams are divided from one clock laser source, and are used for exciting different atomic groups in the two one-dimensional horizontal optical lattices. By synchronously detecting the clock transition spectral lines of each different atomic group, the differential comparison of the clock transition frequencies of different atomic groups is realized, so that the common-mode noise in the optical clock system is suppressed. The method can realize an optical lattice clock with super-high frequency measurement precision in a microgravity environment.

The present application relates to the technical field of optical atomic clock, and discloses a kind of for strontium atom optical clock Multi-mode magnetic field generation and regulation device and method, including three-dimensional magnetic field coil, magnetic field control system and magneto-optical trap;Three-dimensional magnetic field coil includes X direction magnetic field coil, Y direction magnetic field coil and Z direction magnetic field coil;X direction magnetic field coil, Y direction magnetic field coil and Z direction magnetic field coil mutually orthogonal and respectively along opposite position arrangement form cubic skeleton, and magneto-optical trap is located in cubic skeleton;Magnetic field control system is respectively with X direction magnetic field coil, Y direction magnetic field coil and Z direction magnetic field coil electric connection setting.The present application solves the technical problem that the existing strontium atom optical clock system structure is complex, power consumption and thermal load is higher, and not fully utilize the time sequence characteristics of magnetic field use in the process of optical clock operation.

According to the present invention, atoms are trapped by means of a quadrupole magnetic field formed by ring-shaped magnets (106), (108) and three sets of laser beam pairs. A portion of the laser beam pairs LZ is partially blocked by the ring-shaped magnets (106), (108), so that a region (114) which is a non-atom trap space is formed inside a intersecting region (112) where the three groups of laser beam pairs cross. The inside of the intersecting region (112) is irradiated with a laser beam (118) so that atoms within the non-atom catch space are extracted from intersecting region (112).

The application discloses a chip active optical clock based on grating magneto-optical trap cooling and an implementation method thereof. Three saturated absorption spectrum frequency stabilization DBR lasers are used to generate cooling laser, re-pumping laser and pumping laser respectively, wherein the cooling laser and the re-pumping laser cooperate with the grating magneto-optical trap, are used for cooling and confining atoms, and form a cold atom group in an atom chamber; the pumping laser excites the cold atoms, and the generated stimulated radiation signal is directly used as an optical frequency standard signal output, and after frequency beating with a microcavity optical comb, a chip active optical clock is realized. Compared with a traditional cold atom optical clock, the application greatly reduces the volume of the system, can be integrated on a chip, and is suitable for a compact and portable device application scene; compared with a current chip microwave atomic clock, the stability index of the application is higher. The application has important application value, and can provide a long-time and high-precision frequency reference for a movable device.

This invention belongs to the field of cold atom two-dimensional magneto-optical trap technology and discloses a highly integrated miniaturized cold atom two-dimensional magneto-optical trap module, including an atomic beam cavity, and further including: an assembly connecting plate, on which a first mounting area, a second mounting area, and a third mounting area are sequentially arranged along the center outward direction; and a coaxial locking component, which locks the assembly connecting plate, the magnetic field coil module, and the cooling optical module to a fixed relative position. This invention achieves spatial nesting of the magnetic field and optics by radially and coaxially integrating the atomic beam cavity, the magnetic field coil module, and the cooling optical module, forming an integrated module with a volume much smaller than traditional discrete structures. Simultaneously, the coaxial locking component presses and maintains the coaxiality of each functional module along the axial direction. During use, installation can be completed simply by docking with an external vacuum cavity, inserting optical fibers, and connecting plug-in terminals, eliminating the need for on-site debugging of the optical path and magnetic field position, greatly simplifying the assembly and adjustment process.

The utility model discloses an integrated optical machine device for a two-dimensional magneto-optical trap, which belongs to the field of cold atoms and comprises a collimation light, a repulsion light, a light splitting structure, the two-dimensional magneto-optical trap and a reflection structure, and the light splitting structure, the two-dimensional magneto-optical trap and the reflection structure are sequentially arranged along a first direction. The reflecting structure comprises a reflecting mirror group, a front plate, a middle plate, a rear plate, a first bolt and a second bolt, the reflecting mirror group is mounted on the front plate, the lower end of the front plate is connected with the middle plate, and the right end of the middle plate is connected with the rear plate; a first bolt hole and a second bolt hole are formed in the upper end of the middle plate, the first bolt penetrates through the first bolt hole to be connected with the front plate, the second bolt penetrates through the second bolt hole and abuts against the front plate, and the first bolt drives the upper end of the front plate to move towards the middle plate when screwed relative to the first bolt hole. And when the second bolt is screwed relative to the second bolt hole, the upper end of the front plate is driven to move away from the middle plate, so that the cooling efficiency of the two-dimensional magneto-optical trap can be improved.

The application provides a miniaturized cold Rydberg atom antenna device and a noise double-mode suppression method, relates to the technical field of quantum information, and vacuum compatible integrated atom source modules maintain the vacuum degree of a glass vacuum cavity through outgassing sheets and getter sheets; a low-temperature magnetic optical trap can cool atomic gas and gather the cold atomic gas into an F-P cavity; a Rydberg atom detection module can use coupling light to excite atoms to a Rydberg state, use detection light to detect information when cold Rydberg state atoms are split by EIT-AT after a microwave electric field is applied, and generate a main detection signal; an F-P cavity fluorescence suppression module can collect fluorescence emitted by cold Rydberg state atoms and generate a fluorescence noise signal; and a signal processing module can eliminate fluorescence noise based on the main detection signal and the fluorescence noise signal. Through the above mode, the problems that a Rydberg atom antenna device based on cold atoms is large in size and difficult to suppress fluorescence noise are solved, and the detection performance of the device can be improved.

The application provides a method for diagnosing ion temperature of an ultracold strongly coupled plasma, comprising the following steps: heating an atomic source to form a diffused neutral hot atomic gas; constructing a magneto-optical trap by combining a laser field with a gradient magnetic field; trapping and confining the neutral hot atomic gas by the magneto-optical trap to form a cold atomic group with a certain density; introducing a laser with a suitable wavelength to near-threshold photoionize the cold atomic group after focusing to form an ultracold plasma; using an ion lens electric field to lead out and accelerate ions in the ultracold plasma, and using a two-dimensional position-sensitive detector to record the spatial distribution of the ions; combining an inverse Abelian transform numerical inversion method to reconstruct a three-dimensional velocity distribution of the ions; using a Maxwell-Boltzmann velocity distribution law to fit the velocity distribution of the ions to extract ion temperature in the ultracold plasma. The method applies ion velocity imaging technology to the diagnosis of ion dynamics of the ultracold plasma, and can be applied to the ion dynamics research of the ultracold plasma.

The invention relates to the technical field of cold atoms, and provides a laser optical path system for a magneto-optical trap and a method thereof.The laser optical path system comprises a laser, a first light splitting element, an electro-optical modulator, a second light splitting element and a beam combining element, and the second light splitting element is coupled with a frequency stabilization module; the first light splitting element splits laser into a first light beam and a second light beam; the second light splitting element splits the modulated light generated by the electro-optical modulator into two parts, wherein one part of the modulated light enters the frequency stabilization module; the frequency stabilization module enables the frequency of at least one sideband of a part of modulated light to correspond to the re-pumping transition frequency of a target atom; and the beam combining element combines the second light beam with the other part of modulated light and outputs the combined light to the magneto-optical trap. According to the electro-optical modulator, the problem that the input power and the output power of the electro-optical modulator are small is solved by utilizing the requirement of the magneto-optical trap for the small power of the re-pumping light, miniaturization of an optical path system is achieved under the condition that an additional power amplification structure is not needed, and the requirement for power amplification after the electro-optical modulator is omitted.

The invention discloses a device and method for accurately measuring space magnetic field distribution by using a vector lattice light field, the device comprises a radial polarization vector lattice light field generation light path, a magneto-optical trap atom trapping system and an atomic gas imaging system, and the method comprises the following steps: preparing cold atomic gas in a magneto-optical trap; opening a magnetic field to be measured, and turning off the six laser beams and the quadrupole magnetic field of the magneto-optical trap; detecting the cold atom gas by using the radial polarization vector lattice light field; according to the invention, on the basis of the space electromagnetic induction transparency effect of cold atoms, the radial polarization vector light in honeycomb lattice distribution is used for photographing the atomic gas for a single time, so that accurate measurement of the magnetic field distribution in the atomic gas area can be realized.

The invention provides a programmable grating magneto-optical trap optimization device and method based on parameter feedback, and belongs to the technical field of laser grating modulation, the programmable grating magneto-optical trap optimization device comprises a beam collimator 1, a first quarter-wave plate 2, a lens group 3, a vacuum cavity 4, a camera 5, a second quarter-wave plate 6, a liquid crystal spatial light modulator 7 and a magnetic field chip 9; laser sequentially penetrates through the first quarter-wave plate 2, the lens group 3, the vacuum cavity 4, the second quarter-wave plate 6 and the liquid crystal spatial light modulator 7 to be reflected to generate multiple beams of diffraction light, and the multiple beams of diffraction light penetrate through the second quarter-wave plate 6 again to enter the vacuum cavity 4; the computer 8 controls the liquid crystal spatial light modulator 7 to generate a grating pattern; the magnetic field chip 9 is in a space gradient magnetic field in the vacuum cavity 4. According to the invention, intelligent adaptive optimization of the magneto-optical trap is realized, the problem that a traditional static optical trap cannot be optimized online is solved, and the automation level and repeatability of an experiment are improved.

This invention discloses a Zeeman deceleration optimization method, system, and apparatus for multi-component atoms. The method includes: generating a Zeeman decelerator magnetic field based on a magnetic field coil; setting a first cooling light and a second cooling light, and adjusting the intensity and detuning of the first and second cooling lights, as well as the Zeeman decelerator magnetic field, to decelerate a high-temperature atomic beam, obtaining the parameters of the first and second cooling lights and the Zeeman decelerator magnetic field at the point of highest deceleration efficiency. The system includes a magnetic field generation module, a first cooling light deceleration module, a first deceleration efficiency adjustment module, a second cooling light deceleration module, and a second deceleration efficiency adjustment module. The apparatus includes an atomic furnace, a first differential tube, a second differential tube, a Zeeman decelerator, a magneto-optical trap, and the first and second cooling lights. By using this invention, the deceleration efficiency of multi-component atom Zeeman deceleration can be improved. This invention can be widely applied in the field of atomic laser cooling and trapping technology.

The invention discloses an on-chip cold atom gravimeter, which comprises an input optical fiber, a beam expanding and collimating chip, a liquid crystal phase delayer, a passive vacuum cavity, a 1 / 4 wave plate and a reflecting mirror which are arranged on a chip input optical path, a magneto-optical trap chip with a two-dimensional grating, an on-chip magnetic field coil and a cold atomic group falling channel structure is arranged in the passive vacuum cavity, and a chip fluorescence detection lens is mounted on the side wall of the passive vacuum cavity; the invention further discloses application of the device to cold atomic group trapping, Raman light interference measurement and atomic population detection. According to the invention, the size and weight are reduced, the limitation of too short falling distance of an on-chip cold atom interference gravimeter is eliminated, and the method is expected to be popularized to the whole quantum precision measurement field.

The invention provides an integrated magneto-optical trap chip, and relates to the technical field of integrated light quantum chips, the integrated magneto-optical trap chip is composed of a glass shell, a functional chip and a magnetic field chip, and the three parts are sequentially superposed to form an integrated structure; the functional chip comprises a diffraction grating manufactured on the upper surface of the first semiconductor substrate, a microgroove for accommodating a solid-state atom source and a microgroove for accommodating a non-evaporable getter; the glass shell is made into a cavity-shaped structure with an opening in the bottom surface, the bottom surface of the glass shell is attached to the grooving surface of the functional chip, and the glass shell is hermetically connected with the functional chip through a bonding process; the magnetic field chip is characterized in that a planar copper wire coil is formed on a second semiconductor substrate through an electroplating process; and bonding and fixing the non-grooving surfaces of the magnetic field chip and the functional chip by using a curing adhesive. By adopting the scheme of the invention, the application scene is widened. And the maturity of photoetching, etching and bonding is high, and batch and standardized production of devices is easy to realize.

This invention discloses an atomic interferometric gravity gradiometer and gravity gradient measurement method based on a prism-splitting magneto-optical trap, comprising a beam expander / collimator, a first prism-splitting magneto-optical trap assembly, a second prism-splitting magneto-optical trap assembly, a Raman laser collimator / expander, a Raman quarter-wave plate, a Raman mirror, and a vacuum cavity. The first and second prism-splitting magneto-optical trap assemblies are mounted on the vacuum cavity. The cooled beam emitted by the beam expander / collimator is split into two beams, which enter the first and second prism-splitting magneto-optical trap assemblies respectively, generating a first cold atom cluster and a second cold atom cluster. The power of the three sets of opposing beams in each magneto-optical trap is strictly equal, and the intensity and noise are common-mode, which can effectively improve the measurement accuracy of gravity and gravity gradient, reduce the size and weight of the instrument, and has strong robustness, meeting the requirements of engineering applications and dynamic measurements.

The invention discloses a Raman reflector large-angle control and calibration device which comprises a Raman laser light source, a 2 * 2 optical fiber coupler, a Raman collimating lens group, a 1 / 4 wave plate, a Raman reflector I, a Raman reflex lens group, a magneto-optical trap device, a 1 / 4 wave plate II and a Raman reflector II, wherein the Raman reflex lens group, the magneto-optical trap device, the 1 / 4 wave plate II and the Raman reflector II are arranged in an atomic gravimeter structure frame; the invention further discloses a control and calibration method. The method is suitable for the precision and the accuracy of the overlap ratio of the light wave vector reflected by the Raman light and the Raman light at a large angle, and the dynamic environment adaptability of the atomic gravimeter can be greatly improved.

The application discloses a vacuum measuring device and method based on background gas self-correction. The device adopts three nanometer gratings, a pair of anti-Helmholtz coils and a vacuum chamber to realize the function of capturing cold atoms. The method adopts the device, and first, the loss rate G1 of the cold atoms in the three-dimensional magnetic optical trap with the trap depth W1 is measured; second, the three-dimensional magnetic trap with the trap depth W2 is switched to, and the loss rate G2 of the cold atoms is measured; third, the collision loss rate coefficients K of the cold atoms with hydrogen and other residual gases are respectively calculated according to the semi-classical theory loss (W1) 氢气 , K loss (W2) 氢气 , K loss (W1) 其他 and K loss (W2) 其他 ; fourth, the proportion of hydrogen and other residual gases in the ultra-high vacuum background is analyzed, the system loss rate coefficient K loss is corrected, and the vacuum pressure is calculated. The application realizes the self-correction of the composition of the background gas in the ultra-high vacuum based on the quantum characteristics of the cold atoms, solves the technical bottleneck that the existing vacuum gauge cannot accurately measure the ultra-high vacuum, and provides a new way of vacuum tracing.