114 results about "Atomic beam" patented technology

The invention relates to the technical field of atomic frequency standards, in particular to a miniaturized atomic beam clock physical system and a clock generation method. The atomic beam clock physical system comprises an alkali metal atom emission cavity, an alkali metal raw material block, a microcapillary array, a drift cavity, a multi-layer silicon substrate, a laser, an optical fiber type phase modulator, a beam splitter prism, a plurality of reflectors and a signal detector. Compared with a traditional coherent population detection mode based on a bubble chamber, the chip-scale atomic clock has narrower fluorescence spectrum width and higher long-term frequency stability, meanwhile has the chip-scale capability, and has higher competitiveness compared with an existing chip-scale atomic clock based on an air chamber structure.

The invention provides a device and a method for generating a Lammer-type hot atomic beam light clock based on periodic pulses. The device comprises a pulse laser, a laser frequency stabilization system, an optical switch, a Laammer type hot atom chamber and a laser detection feedback system. Wherein the pulse laser is used for emitting first laser, and the pulse time is nanosecond magnitude. The laser frequency stabilization system is used for carrying out pre-frequency stabilization on the first laser to obtain second laser, and the second laser is conveyed to the Laammer type hot atom chamber through the optical switch; the switching period of the optical switch is set to be microsecond magnitude; the lamplug type hot atom chamber is used for outputting a lamplug type hot first atom beam; and the laser detection feedback system is used for detecting the first atomic beam, feeding back and controlling the pulse laser, locking the frequency of the pulse laser on a transition spectral line of atoms, and obtaining a hot atomic beam light clock. According to the invention, the interaction time of laser and atoms can be controlled, and the utilization rate of the atoms of the Lammer-type hot atomic beam light clock can be improved.

The invention provides a low-temperature bonding method for reducing surface damage and a bonding sheet thereof, and relates to the technical field of wafer bonding. In a high vacuum environment, the bonding surfaces of a first wafer and a second wafer which are to be bonded are subjected to first irradiation treatment by using a first atomic beam to obtain a first activation layer; s2, carrying out at least one second irradiation treatment on the bonding surface after the first irradiation treatment in the step S1 by adopting a second atomic beam to obtain a second activation layer; and carrying out ballasting bonding to obtain a bonding sheet. According to the low-temperature bonding method for reducing the surface damage, the bonding surface is activated in a gradient manner, so that the damage to the surface of the wafer caused by single activation can be reduced, the surface roughness is reduced, the probability of bubbles after bonding is reduced, and the bonding strength is improved.

An adjuster performs simultaneous irradiation of M laser beams to an atomic beam, where M is a predetermined integer satisfying 3≤M. The course of each of the M laser beams intersects with the course of the atomic beam. A component, in a direction perpendicular to the course of the atomic beam, of the sum of radiation pressure vectors that the M laser beams respectively have is zero. A component, in a direction of the course of the atomic beam, of the sum of the radiation pressure vectors that the M laser beams respectively have is negative for atoms having speeds greater than a predetermined speed, and positive for atoms having speeds smaller than the predetermined speed.

Provided are an atomic beam magnetic resonance method and system based on combined separated oscillatory fields. The method includes: generating, by an atomic beam source, two identical atomic beams; performing atomic state purification treatment on the two identical atomic beams to generate two identical state-purified atomic beams; exciting, by zero-phase-difference SOFs, one identical state-purified atomic beam to perform atomic beam magnetic resonance to obtain a first atomic beam magnetic resonance signal; and exciting, by π-phase-difference SOFs, the other identical state-purified atomic beam to perform atomic beam magnetic resonance to thereby obtain a second atomic beam magnetic resonance signal, the zero-phase-difference SOFs and the π-phase-difference SOFs have the same interaction length, the same drift length, and the same oscillatory field strength; and performing subtraction operation on the first atomic beam magnetic resonance signal and the second atomic beam magnetic resonance signal to thereby generate a combined Ramsey magnetic resonance signal.

The invention provides a neutral atom beam generation device and a neutral atom detector calibration device. The neutral atom beam generation device comprises an ion beam generation device used for emitting a mixed beam; the particle energy testing device comprises an incident end, a first emergent end, a second emergent end and an acquisition device, the incident end is used for receiving the mixed beam; the incident end is communicated with the second emergent end through an arc-shaped channel, and a deflection magnetic field is arranged at the arc-shaped channel, so that positive ions in the mixed beam flow deflect and bombard the acquisition device; the acquisition device is used for acquiring a first bombardment position of positive ions; the first emergent end is used for emitting a first ion beam; the processing device is connected with the collecting device and used for determining the deflection radius of the positive ions according to the first bombardment position and determining the energy of the positive ions and the neutral atoms according to the deflection radius; and the particle screening device is used for absorbing positive ions and negative ions in the first ion beam so as to emit a neutral atom beam.

To collimate an atomic beam by using laser beams, without requiring high-precision parallel arrangement of the laser beams.SOLUTION: An atomic beam 110 is subjected to quantum collimation. The atomic beam 110 is irradiated with a pumped laser beam 701a and a filtering laser beam 701b in this order. The pumped laser beam 701a has a wavelength corresponding to transition between a ground state and an excited state of an atom contained in the atomic beam 110. The atom is transitioned from the ground state to the excited state, and further, the atom is relaxed from the excited state to a metastable state, according to irradiation of the pumped laser beam 701a. The filtering laser beam 701b has a wavelength corresponding to transition between the ground state and the metastable state. According to irradiation of the filtering laser beam 701b, an atom of the metastable state having a velocity component that is the same as a prescribed velocity component Δv or smaller than Δv, in a travel direction of the filtering laser beam 701b, is transitioned to the ground state.SELECTED DRAWING: Figure 2

An atomic-beam source device is configured to provide a collimated beam of atoms, wherein solid-state electrochemistry is employed to recirculate atoms that are caught on collimation channel walls. The use of solid-state electrochemistry to recirculate atoms enables a chip-scale, dark-wall, high-quality collimated beam source that does not clog over time. Some variations provide an atomic-beam source device comprising: a first electrode; a second electrode that is electrically isolated from the first electrode; a first ion conductor interposed between the first electrode and the second electrode, wherein the first ion conductor is capable of transporting metal ions, and wherein the first ion conductor is in contact with the first electrode and with the second electrode; and one or more collimation channels disposed outwardly from the first ion conductor. Methods of using the atomic-beam source device are disclosed, including methods to recirculate and reuse metal atoms adsorbed on collimation channel walls.

An inertial sensor includes a dual atom interferometer. A moving standing light wave generation device in the dual atom interferometer generates M (3≤M) moving standing light waves. Each of the M moving standing light waves is generated by a pair of counter-propagating laser beams. The moving standing light wave generation device adjusts two-photon detuning of a pair of counter-propagating laser beams corresponding to each of N (2≤N<M) moving standing light waves out of the M moving standing light waves such that the difference between an interferometric phase corresponding to one atomic beam obtained by interfering with the M moving standing light waves and an interferometric phase corresponding to the other atomic beam obtained by interfering with the M moving standing light waves stays constant.

The invention belongs to the technical field of cold atom beam preparation equipment, and discloses a cold atom beam generation device capable of rapidly replacing an atom source, and the device comprises a vacuum optical cavity which is a hollow cavity and is provided with at least one connection port; the atomic source module is arranged in the vacuum optical cavity and is detachably connected with the connecting port of the vacuum optical cavity; and the port function module is detachably and hermetically connected with the connecting port of the vacuum optical cavity. Through modular structures of the differential flange, the electrode flange, the rotating wheel base and the like, when the atom source is used up, a user does not need to depend on an original equipment factory for disassembly like a traditional scheme, but can operate by himself / herself, and only needs to disassemble and replace the atom source module at a port of the electrode flange, so that the maintenance mode that professionals need to intervene is changed, and the maintenance efficiency is improved. And the convenience of equipment maintenance is improved, the downtime of the system is reduced from several days or even several weeks required by a traditional scheme, and the service continuity and the operation efficiency of the equipment are also improved.

An atomic beam is quantum-mechanically collimated. The atomic beam is irradiated with a pumping laser beam and a filtering laser beam in this order. The pumping laser beam has a wavelength corresponding to a transition between a ground state and an excited state of atoms in the atomic beam. Irradiation with the pumping laser beam causes atoms to make transition from the ground state to the excited state and further relax from the excited state to a metastable state. The filtering laser beam has a wavelength corresponding to a transition between the ground state and the metastable state. By irradiating the filtering laser beam, atoms in the metastable state having velocity components equal to or smaller than a predetermined velocity component Δv in a traveling direction of the filtering laser beam are caused to make transition to the ground state.

The present disclosure relates to an atomic beam oven (100) for generation and collimation of an atomic beam. The oven (100) includes a cylindrical cavity (102) configured to store an atom source and the atom source includes one or more alkali to alkaline earth metals, a heating element distributed around the body of the cylindrical cavity (102) to heat the atom source and maintain a uniform temperature gradient between a hot end and cold end of the body, and an array of micro drilled holes (106) arranged in a hexagonal pattern on a separate blank flange (104) clamped onto the cylindrical cavity (102) through a gasket secured by bolts and nuts (108). The heating of the atom source by the one or more heating elements generates a stabilized flux of an outgoing effusive atomic beam from the atom source through an outlet (110).

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

The invention provides a quantum state preparation method of a continuous cold cesium atom beam, and relates to the field of cold atom physics and quantum frequency standards. According to the method, an external magnetic field is arranged in a quantum state preparation area, when an atomic beam penetrates through the preparation area, the atomic beam interacts with two beams of orthogonal laser at the same time, and therefore quantum state preparation is completed. The first laser beam is unpolarized, and the frequency of the first laser beam is locked on a cesium atom D2 line F = 4gt; f '= 3gt; on the transition frequency, the frequency of the second laser beam is locked on the cesium atom D2 line F = 3gt; f '= 3gt; in the transition frequency, the polarization direction is parallel to the direction of the external magnetic field. The cesium atoms are pumped to the energy level F = 3 through the first laser beam, the cesium atoms are prepared to the energy level F = 3 through the second laser beam, and m = 0gt; and quantum states. A reflector is arranged in the incident direction of each beam of laser, and incident light returns along the same path to form correlation, so that scattering force in two directions is balanced, a one-dimensional optical cohesive group is formed to cool atoms again, and stability of cold atom beams is guaranteed.

This application provides an inertial measurement method and system based on atomic interferometry. The method includes: controlling a first atomic beam and a second atomic beam to exit into an interference region, and sequentially interacting with three pulse beams in the interference region to detect the corresponding momentum transfer probability signals. The exit directions of the first and second atomic beams intersect and are symmetrical about the quantization axis. The effective pulse vector directions of the three pulse beams are adjusted so that the adjusted effective pulse vector directions are opposite to those of the original three pulse beams. The first and second atomic beams are then controlled to exit into the interference region, and sequentially interact with the adjusted three pulse beams in the interference region to detect the corresponding momentum transfer probability signals. Based on the four momentum transfer probability signals, the inertial measurement result is determined. Thus, by reversing the effective pulse vector direction, the interference area is reversed, effectively suppressing noise and drift terms unrelated to the effective pulse vector direction.

The invention discloses a bifocal reflection-type atomic fluorescence detection system for an atomic beam interferometer. The bifocal reflection-type atomic fluorescence detection system comprises a vacuum cavity, a reflector and a detector, the vacuum cavity is a sealed cavity; an atomic beam generated by an atomic furnace mounted in the vacuum cavity is propagated in the y-axis direction in the vacuum cavity; a window is formed in the cavity wall of the vacuum cavity in the x-axis direction, and detection light enters the vacuum cavity from the window and propagates in the x-axis direction; windows are formed in the opposite positions of the two sides of the vacuum cavity wall in the + / -z axis direction, and a reflecting mirror and a detector are correspondingly installed outside the windows respectively; the propagation directions of the atomic beam and the detection light are perpendicular to each other, and in an intersection area of the atomic beam and the detection light, atoms absorb the detection light to jump to a high energy level and then spontaneously radiate fluorescence, namely an atomic fluorescence light source; the atomic fluorescent light source emits isotropic fluorescent light to the periphery, a part of the light irradiates the reflector and is focused on the receiving end face of the detector after being reflected, and the detector detects a fluorescent signal, converts the fluorescent signal into an electric signal and reads the electric signal.

The invention relates to the field of atomic frequency standards, and provides a method and a device for stabilizing an atomic beam clock static magnetic field based on double atoms. A second atom is introduced on the basis of a traditional atomic beam clock, so that the two atoms act together in the same path and the same magnetic field, and a first atom is responsible for generating clock transition and serves as a main frequency reference; and the second atoms are specially used for static magnetic field stabilization. And periodically scanning the Ramsey pattern of the second atom to detect the change of the static magnetic field, and compensating according to the change so as to ensure that the static magnetic field is kept constant. The double atoms are in the same static magnetic field environment, so that when the static magnetic field of the second atom is stable, the static magnetic field of the first atom is also kept stable, and the frequency shift of the magnetic field is effectively eliminated. In the whole process, the locking loop of the first atom is always in a closed state, so that the adverse effect on the long-term stability caused by loop opening in a traditional method is avoided, and the long-term stability of the atomic beam clock is improved.

The present invention discloses a method for preparing a direct traceability grating with high diffraction efficiency, belonging to the field of high-precision grating manufacturing. The method comprises the following steps: 1) generating a neutral atomic beam in a vacuum using a high-temperature thermal evaporation method; 2) reducing the lateral motion velocity of the neutral atomic beam using laser Doppler cooling; 3) converging the atomic beam using a laser standing wave field and depositing it vertically onto a substrate to form a direct traceability grating structure; and 4) sequentially depositing a metal film and a protective film on the surface of the direct traceability grating using a thermal evaporation method to obtain a standard sample of a direct traceability grating with high diffraction efficiency. The present invention provides a method for preparing a direct traceability grating with high diffraction efficiency, which can significantly improve the diffraction efficiency of the direct traceability grating, is simple to operate, and does not destroy the self-traceability of the direct traceability grating.

Some embodiments of the present disclosure provide atom beam interferometry. MTL beams are directed to respective MTL regions along a 3D-cooled atom beam. Within each MTL region, the respective MTL beam coherently imparts photon recoil momenta to atoms of the atom beam to produce an interference signal in the atom beam. The MTL beams are switched between first and second cases providing first and second interfering trajectory paths for the atom beam, and the atom beam is continuously directed through the MTL regions while switching the MTL beams. Atoms from the atom beam are received along the first and second interfering trajectory paths at a detection region. State-dependent responses from the atoms of the atom beam are induced in the detection region to provide data of atomic states occupied by the atoms. The data of the atomic states is translated into an interferometry measurement. Related interferometers are also disclosed.

This invention relates to a real-time calibration and stabilization system for a dual-modal controlled atomic beam gyroscope, characterized by: a rubidium source cavity outlet end sealed to a capillary cavity inlet end, and a capillary cavity outlet end sealed to a two-dimensional cooling cavity inlet end; a capillary assembly front end connected to an angle control unit, and a rear end supported at the capillary cavity outlet end, connected to a flux control unit located at the rear; the angle control unit is used to realize automatic displacement adjustment of the capillary assembly in the X and Y directions, achieving geometrical alignment of the emitted atomic beam with the vacuum chamber; two-dimensional cooling light irradiates the two-dimensional cooling cavity; a photoelectric detection unit is used to measure the atomic beam passing through the two-dimensional cooling cavity in the X and Y directions; a data processing and control unit is used to perform differential calculations and logical judgments on the X and Y direction measurement signals respectively, and generate corresponding control signals to drive the angle control unit and flux control unit, controlling the spatial position and flux stability of the beam atoms.

The present invention relates to the technical field of atomic clock operation reliability monitoring, and more specifically, to a method and apparatus for monitoring the operation reliability of an atomic clock. The apparatus comprises a central processing unit (CPU), an evaluation system, and a status indication module; the evaluation system is connected to the CPU; and the indication module is connected to an output terminal of the CPU to display the operating status of the atomic clock. The present invention monitors the operation of the atomic clock before startup using a reproducible performance evaluation, an accurate performance evaluation, and an atomic beam performance evaluation unit to avoid abnormal startup and improve operational reliability. The system also displays the operating status of the atomic clock in conjunction with the status indication module.

The present application relates to the field of atomic frequency standards and provides a method and device for stabilizing the static magnetic field of an atomic beam clock based on two atoms. By introducing a second atom on the basis of a traditional atomic beam clock, the two atoms work together in the same path and magnetic field. The first atom is responsible for generating clock transitions as the main frequency reference; while the second atom is specifically used for static magnetic field stabilization. By periodically scanning the Ramsey pattern of the second atom, the changes in the static magnetic field are detected and compensated accordingly to ensure that the static magnetic field remains constant. Since the two atoms are in the same static magnetic field environment, when the static magnetic field of the second atom is stable, the static magnetic field of the first atom also remains stable, effectively eliminating the magnetic field frequency shift. Throughout the process, the locking loop of the first atom is always in a closed state, avoiding the adverse effects on long-term stability caused by the open loop in the traditional method, and improving the long-term stability of the atomic beam clock.

The invention relates to a three-dimensional cooling atomic beam preparation device and method. The three-dimensional cooling atomic beam preparation device is characterized in that the emergent end of an atomic gas chamber is connected with the incident end of an atomic collimator; the emergent end of the atom collimator is connected with the incident end of the cooling cavity, the emergent end of the cooling cavity is connected with the incident end of the detection cavity through a pipeline, and the pipeline is connected with a vacuum pump; the three-dimensional cooling laser pair acts on the cooling cavity, and the upper detection laser and the lower detection laser oppositely act on the detection cavity up and down; the cut-off laser acts on the rear end of the cooling cavity; the atomic gas chamber is used for generating hot atoms; the atom collimator is used for forming a hot atom beam and enabling the hot atom beam to enter the cooling cavity; the cooling cavity forms a cold atom beam under the combined action of the three-dimensional cooling laser pair and enables the cold atom beam to enter the detection cavity; the two detection lasers enable an electric signal of the cold atom beam to form a fluorescence signal to be output; and the fluorescence collection device is used for collecting fluorescence signals and inputting the fluorescence signals into the computer for processing to obtain information such as three-dimensional temperature, flux, speed and speed distribution of the cold atom beam. According to the invention, high-flux and three-dimensional low-temperature atomic beam output is realized at the same time.

The application provides a kind of laser pumped cesium atomic beam clock parameter adaptive setting device and method, relating to atomic clock technical field, including cesium beam tube unit;Cesium beam tube drive unit;Frequency stabilization laser light source unit;Acoustooptic frequency shift unit;Crystal oscillator lock frequency unit;Temperature acquisition and control unit;Wherein, main control unit is connected each controlled module by communication interface, and in-machine computer runs host computer software: calculate relative frequency deviation and allan variance, obtain frequency deviation sequence and allan variance data set;Determine the optimal working parameter combination corresponding to peak value;Linkage executes primary temperature control, secondary temperature control and tertiary temperature control, realizes temperature gradient compression and wavelength stability control;Compare real-time monitoring parameters with preset threshold, determine alarm level, thereby trigger system response instruction.The beneficial effects of the application are to reduce labor cost, improve temperature adaptability and improve long-term stability index.

The application relates to a cold atom beam preparation device and a preparation method. The cold atom beam preparation device comprises a vacuum chamber, a magnetic field element arranged outside the vacuum chamber, a transverse cooling module and a longitudinal cooling module. The transverse cooling module is used for injecting two pairs of first lasers and two pairs of second lasers into the vacuum chamber. The longitudinal cooling module is used for injecting two pairs of moving optical glue lasers into the vacuum chamber. Each pair of moving optical glue lasers is emitted along a direction which forms an angle with a third direction and a transverse plane. The third direction is the emission direction of the atom beam, the transverse plane is perpendicular to the third direction, and the light path direction of the first laser, the light path direction of the second laser and the third direction are perpendicular to each other. The cold atom beam preparation device has a simple structure, realizes transverse cooling of the atom beam and longitudinal cooling of the atom beam, generates longitudinal velocity of the atom vapor and controls the longitudinal velocity of the atom beam, and obtains a cold atom beam which has low three-dimensional cooling temperature and controllable longitudinal velocity.

The invention relates to the technical field of quantum precision measurement, and discloses an optical clock device based on a bidirectional thermal atom beam, which comprises a first stabilizing module, a second stabilizing module and a feedback control module, the first stabilizing module is used for outputting clock transition detection laser; the second stabilizing module is used for detecting to obtain an optical Laammer spectrum, and is also used for outputting an optical signal with stable frequency; and the feedback control module is used for extracting an error signal from the optical Lammer spectrum and feeding back the error signal to the frequency shifter, so that the clock transition detection laser is locked to the atomic transition spectral line through frequency shifting of the frequency shifter. The cost is low, the structural complexity is low, and the stability of output signals is high.

The invention provides a laser pumping cesium atom beam clock parameter self-adaptive setting device and method, and relates to the technical field of atomic clocks. A cesium beam tube driving unit; a frequency-stabilized laser light source unit; an acousto-optic frequency shift unit; a crystal oscillator frequency locking unit; a temperature acquisition and control unit; wherein the main control unit is connected with each controlled module through a communication interface, and the built-in computer runs upper computer software: calculating relative frequency deviation and Arron variance, and obtaining a frequency deviation sequence and an Arron variance data set; determining an optimal working parameter combination corresponding to the peak value; primary temperature control, secondary temperature control and tertiary temperature control are executed in a linkage mode, and temperature gradient compression and wavelength stability control are achieved; and comparing the real-time monitoring parameter with a preset threshold value, and judging an alarm level, thereby triggering a system response instruction. The method has the beneficial effects that the labor cost is reduced, the temperature adaptability is improved, and the long-term stability index is improved.

The present invention provides an atomic beam collimator and a manufacturing method thereof. The manufacturing method comprises: providing a silicon substrate, etching a first groove structure parallel to each other on a first surface in a thickness direction of the silicon substrate; providing a first supporting layer, anodically bonding the first supporting layer to the first surface in a thickness direction of the silicon substrate to form a stacked body; and cutting the stacked body to obtain an atomic beam collimator; wherein the first groove structure located between the silicon substrate and the first supporting layer serves as a first microchannel of the atomic beam collimator.

The invention discloses a method for preparing a palladium ditelluride single crystal film by using a molecular beam epitaxy method, and belongs to the technical field of nano material preparation. Comprising the following steps: ultrasonically cleaning a silicon carbide substrate, putting the silicon carbide substrate into a growth cavity, and performing annealing treatment to remove impurities adsorbed on the surface of the substrate; performing flash processing on the annealed silicon carbide substrate for multiple times in a mode of increasing and reducing current to obtain a double-layer graphene surface, and then reducing the temperature of the substrate to a growth temperature; pd and Te are placed in different evaporation sources to be heated, the atomic beam flow rate ratio of Pd to Te is adjusted by controlling the evaporation temperature during growth, Pd and Te grow on a substrate in a co-deposition mode, and baffles of the Pd source and the Te source are opened at the same time; and after the growth is completed, closing the Pd source baffle plate and the Te source baffle plate, and annealing the substrate. According to the method, the preparation conditions of the thin film can be accurately regulated and controlled, so that the controllable growth of the thin film material is achieved.

The application provides a low-temperature bonding method for reducing surface damage and a bonded wafer, and relates to the technical field of wafer bonding. In a high-vacuum environment, the bonding surfaces of a first wafer and a second wafer to be bonded are subjected to first irradiation treatment by using a first atomic beam, so that a first activated layer is obtained; the bonding surfaces after the first irradiation treatment in step S1 are subjected to at least one second irradiation treatment by using a second atomic beam, so that a second activated layer is obtained; and pressure bonding is performed, so that a bonded wafer is obtained. The low-temperature bonding method for reducing surface damage adopts gradient-activated bonding surfaces, can reduce the damage to the wafer surface caused by single activation, reduce the surface roughness, thereby reducing the probability of the occurrence of air bubbles after bonding, and improving the bonding strength.