60results about "Masers" patented technology

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.

The present application relates to a kind of device for accurately adjusting the trajectory of atomic transverse motion, including bellows, first threaded rod, second threaded rod, third threaded rod, first piezoelectric ceramic, second piezoelectric ceramic, third piezoelectric ceramic, piezoelectric ceramic drive, atom source cavity, interference cavity, detection cavity, atom source, upper raman light, first 1 / 4 wave plate, first 0 ° mirror, lower raman light, front raman light, second 1 / 4 wave plate, second 0 ° mirror, rear raman light, upper detection light, third 0 ° mirror, lower detection light, fluorescence collection device, photodetector, ion pump, vacuum pipeline, adapter flange, signal acquisition device and computer.The present application can realize the precise adjustment of the trajectory of atomic motion without affecting the parameters of atom itself.

This invention discloses a magnetic permeation device and method for guiding the deflection of single-quantum-state atoms. The magnetic permeation device includes a vacuum chamber, a connecting frame, and several magnetic permeation components. A high-vacuum chamber is formed within the vacuum chamber. The connecting frame is mounted on the inner wall of the vacuum chamber. Several magnetic permeation components are arranged in an arc shape on the connecting frame. An atomic channel is located at the center of each magnetic permeation component. The atomic channels on the several magnetic permeation components are sequentially connected to form an arc-shaped atomic channel with a non-uniform gradient magnetic field, used to drive the atom deflection. Based on the atom Zeeman effect, this application sets up magnetic permeation components to enable controllable deflection of atoms within the arc-shaped atomic channel, achieving specific-angle deflection transmission of a neutral atom beam and achieving a velocity filtering effect for atoms.

The application discloses an electromagnetic wave oscillator capable of realizing dynamic coning adjustment, which comprises upper and lower iron core arrays symmetrically arranged relative to the center of an electron beam vacuum chamber; an excitation coil system comprises a plurality of excitation coils of the same specification wound on the main period iron core and the end iron core respectively, and generates a magnetic field perpendicular to the direction of electron beam movement; an independent power supply control system comprises a plurality of power supply modules corresponding to the main period and at least two independent end power supply modules; the independent power supply control system is connected with the excitation coil system, each period of excitation coil group is independently powered by two independent power supply modules, the current flow directions of a group of excitation coils opposite to each other are the same, and the current flow directions of adjacent excitation coils are opposite. The application can reduce the serious electron orbit distortion caused by the sharp change of the longitudinal magnetic field gradient in the strong coning mode, thereby providing an ideal technical scheme for the demand of improving the free electron laser efficiency, the inverse free electron laser accelerator and the like.

The invention relates to a device (1) for characterising a surface (SE) of a sample (E), comprising: − a chamber (C) comprising a medium (PE) for said sample, said chamber being connected to a pump, referred to as the primary pump (PP), suitable for maintaining a pressure below 10−2 mbar within said chamber; − a source (SN) for generating an incident beam (NB) of neutral atoms or molecules having an energy of between 50 eV and 5 keV, with a divergence less than or equal to 0.05°, said source being arranged to direct said incident beam (NB) within said chamber through an inlet (EF) to said surface (SE) to be characterised with an angle of incidence (θ i n ) less than or equal to 10° relative to the plane of said surface, the neutral atoms or molecules of said incident beam (NB), forwardly scattered by said surface (SE), forming a diffracted beam (DB); and − a detection enclosure (ZDU) connected to said chamber and connected to a pump, referred to as UHVP pump, comprising: − an assembly of concentric tubes (Ens), each tube (T1, T2) having one end, referred to as the inlet end, with an opening (O1, O2), said assembly comprising a tube having a smallest radius (T1) and a length L; − a position-sensitive detector (Det) suitable for detecting a diffraction pattern (FD) of the neutral atoms or molecules of said diffracted beam; said length L and said openings (O1, O2) being suitable for transporting said diffracted beam to the detector without losing spatial information regarding said surface (SE), said openings and said UHVP pump being suitable for maintaining a pressure below 10−5 mbar within the detection enclosure.

The invention provides a low-temperature molecular beam device, which relates to the field of low-temperature physical chemistry and comprises a refrigeration assembly, a primary shielding cover and a buffer cooling structure. The refrigeration assembly comprises a first-stage cold head and a second-stage cold head; the first-stage shielding cover is provided with a first-stage shielding inner cavity; the first-stage cold head is connected with the first-stage shielding cover and is used for cooling the first-stage shielding cover; the second-stage cold head is accommodated in the first-stage shielding inner cavity; the buffer cooling structure is connected to the second-stage cold head and is accommodated in the first-stage shielding inner cavity; the buffer cooling structure is provided with a buffer cooling inner cavity, and the buffer cooling inner cavity is used for introducing buffer gas and target molecules. According to the low-temperature molecular beam device in the embodiment of the invention, the temperature of the buffer gas can be further reduced.

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.

This invention discloses a shell structure and fabrication method for a laser control module in a microwave photonics system. The structure includes a ceramic component with a first metal frame and a second metal frame disposed on its upper and lower surfaces, forming a double-sided cavity structure for encapsulating multiple components. Several lead pads are arranged around the ceramic component, with a metal lead soldered onto each lead pad. Several metallized patterns are formed on each layer of the ceramic component's surface and interior. The metallized patterns on the surface of the ceramic component are connected to the metallized patterns inside the ceramic component through metal holes, forming multiple signal networks. Signal networks not connected to the lead pads are called island networks. Electroplated interconnects are distributed on the surface of the ceramic component, connecting the island networks to the lead pads for nickel-gold plating of the island networks. This invention effectively improves the integration of the circuit module and also improves electroplating efficiency, ensuring a high plating yield.

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.

The invention relates to an atomic chip (Ach) for an ultracold atom sensor, comprising an XY measurement plane, the atomic chip comprising: - a plurality of first pairs of waveguides, - a plurality of second pairs of waveguides, the projections in the XY plane of the first pair furthest from X and of the second pair furthest from Y' forming at their intersection a parallelogram (P) with center O, - a first conducting wire (W1) having a projection in the XY plane along X or Y' or a diagonal (D1, D2) of said parallelogram, the first conducting wire being adapted to be traversed by a direct current, - said first wire having a flare so as to take the form of a surface (S) whose projection in the XY plane encompasses said parallelogram (P) and has a symmetry with respect to the point O.

The invention relates to the field of monatomic or cluster particle preparation equipment, in particular to monatomic / cluster generation equipment and a preparation method thereof.The monatomic / cluster generation equipment comprises a control module, a generator and an air source module; the generator comprises a generating chamber, a first electrode mounting position arranged in the generating chamber and used for mounting a first electrode, a second electrode mounting position used for mounting a second electrode and arranged opposite to the first electrode mounting position, an electrode distance adjusting assembly and a power module. The electrode distance adjusting assembly is used for adjusting the distance between the first electrode and the second electrode; the power supply module is used for providing a pulse power supply for the first electrode and the second electrode based on a corresponding control signal of the control module so as to generate spark ablation between the first electrode and the second electrode, thereby generating corresponding monatomic; and the gas source assembly is electrically connected with the control module so as to convey corresponding carrier gas into the generation chamber based on a corresponding control signal, so that cluster particles are obtained.

The application provides a high-power multicolor terahertz radiation generation device based on beat laser accumulation, which comprises an injector, an electron beam modulation system and a radiation system arranged in sequence; and a femtosecond laser system comprising a femtosecond laser, a first light splitting plate and a first mirror arranged in sequence and parallel to the electron beam transmission axis, the first light splitting plate splits the femtosecond Gaussian laser pulses from the femtosecond laser into first and second path femtosecond Gaussian lasers, the first light splitting plate, a pulse broadening system and the injector are arranged in sequence, and the first mirror, a laser accumulation system and the electron beam modulation system are arranged in sequence; the laser accumulation system generates beat accumulation laser with multiple terahertz cycles after receiving the second path femtosecond Gaussian laser. The device of the application can realize the center frequency of the multicolor terahertz radiation being adjustable, the number of the multicolor being variable, the frequency and time interval being controllable, the layout being simple, the tunability being strong and the flexibility being relatively high.

The invention provides a cold atom preparation device and method, and relates to the technical field of ultralow-temperature atoms. The device comprises an atomic furnace, a speed reducer, a capturer and a pusher, wherein the pushing direction of the pusher is the opposite direction of the gravity direction, in the pushing direction, the capturer is arranged at the top of the speed reducer, the speed reducer is arranged at the top of the pusher, and the pushing center of the pusher, a first center area of the speed reducer and a second center area of the capturer are collinear; in the horizontal direction perpendicular to the pushing direction, the speed reducer and the atom furnace are arranged on the same plane, and the atom furnace is used for generating atoms to be captured and conveying the atoms to be captured to the speed reducer; the speed reducer is used for reducing the speed of the to-be-captured atoms and trapping the to-be-captured atoms in the first central area; the pusher is used for sending pushing light in the pushing direction to the first central area, and pushing atoms to be captured to the second central area of the capturer through the pushing light; the capturer is used for capturing and cooling the to-be-captured atoms to obtain cold atoms.

An exemplary embodiment of the present disclosure provides a chip-scale atomic beam system including an atomic vapor source, a plurality of conduits, and a propagation chamber. The atomic vapor source chamber may include an atomic vapor source configured to emit atomic vapor. The plurality of conduits may have a first end and a second end. The first end may be in fluid communication with the atomic vapor source chamber. The plurality of conduits may be configured to collimate the atomic vapor as it travels through the plurality of conduits from the first end to the second end. The propagation chamber may be in fluid communication with the second ends of the plurality of conduits. The propagation chamber may have an internal pressure lower than an internal pressure of the atomic vapor source chamber to allow the collimated atomic vapor to propagate through the propagation chamber.

The invention relates to the technical field of optics, and discloses a broadband circular polarization terahertz source and application thereof, and the broadband circular polarization terahertz source comprises a free electron beam moving along a predetermined direction and a stacked bianisotropic metasurface located above the free electron beam; wherein the stacked bianisotropic metasurface comprises at least two layers of metal gratings which form a stacked structure; the at least one dielectric plate is used for separating the metal grating; wherein the number of layers of the dielectric plate is one less than that of the metal grating; and the metal grating and the dielectric plate form a periodic structure together, and are used for coupling evanescent wave energy of the free electron beam into multiple resonant modes so as to excite broadband circular polarization terahertz radiation. According to the technical scheme provided by the invention, the tunable and compact terahertz source with high power output can be realized.

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 a workpiece carrier (10) for producing a laser diode module. The workpiece carrier (10) has: a number of positioning devices (22, 24) for positioning the workpiece carrier (10); a main body (18) having a fastening portion (30) and an opening (32); and a fastening device (40) designed to fasten a base plate (12) of the laser diode module to the fastening portion (30). At least portions of the opening (32) are covered by the base plate (12) when the base plate (12) is fastened to the fastening portion (30) by means of the fastening device (40).

This invention provides a topology-protected electromagnetic energy combiner, comprising a first copper-clad substrate, a photonic crystal cluster, and a second copper-clad substrate connected sequentially from top to bottom. The photonic crystal cluster is composed of multiple photonic crystals, which are rectangular arrays of square YIG lattice pillars. Each photonic crystal has different topological indices. Adjacent photonic crystals generate unidirectional, non-scattering topological boundary states in a first, second, or third direction at their boundaries. Based on the topology-protected mode orthogonal excitation theory, this invention introduces unidirectional, non-scattering topological boundary states into electromagnetic energy combining, breaking through the constraints of phase correlation and polarization degrees of freedom of the input electromagnetic energy source in traditional electromagnetic energy combining theory. This enables the design of an electromagnetic energy combiner structure with arbitrary phase, high efficiency, wide bandwidth, and scalability.

The present invention discloses a beam source system for generating low-temperature molecules, comprising a vacuum system, a pulse tube refrigerator, a gas reaction chamber, a gas pipeline, a flowmeter, a sample rod, a motor transmission device, a vacuum stepper motor, a motor driver, and a YAG laser. The present invention enables the low-temperature motor to drive the experimental sample rod to rotate continuously and stably at ultra-low temperatures; the YAG laser uniformly ablates the side surface of the sample rod, and an inert pre-cooled carrier gas is used to achieve the continuous and stable generation of low-speed and low-temperature atomic or molecular beams. The specially designed low-temperature motor has freely adjustable speed and ensures that, while the beam source is stable, motor heating will not cause the beam source cavity temperature to exceed 5K. Since the position of the YAG ablation focus does not need to be changed, the aerodynamic properties within the beam source cavity can be kept stable. The present invention has the advantages of high stability and good beam quality, and has significant application prospects in the field of atomic and molecular physics.

The invention provides a rotatable self-focusing type spintronics terahertz source, and belongs to the technical field of terahertz application and optical application, the rotatable self-focusing type spintronics terahertz source comprises a main support, a rotating disc, a spintronics terahertz source heterojunction film-lens system and a permanent magnet, the rotating disc is internally provided with rotating disc threads, the spintronics terahertz source heterojunction film-lens system is connected with the rotating disc through the rotating disc threads, rotating disc two-side threaded holes are formed in the two centrosymmetric sides of the rotating disc, and the permanent magnet is connected with the rotating disc through the rotating disc two-side threaded holes. By adopting the rotatable self-focusing type spintronics terahertz source, the problems of a traditional terahertz source in the aspects of power loss, system integration level, power density, focusing effect, thermal stability and radiation area are solved.

This application relates to the field of aerospace metrology technology, specifically to a polyatomic directional flow generation device. The device includes a directional flow generation chamber. Inside the chamber, an axially arranged radio frequency ion source, an ion acceleration module, an ion screening module, an ion neutralization module, and an ion absorption module are sequentially arranged. An radio frequency generation and pulse modulation module is mounted on the outer wall of the chamber, comprising a radio frequency signal generator, a pulse modulation module, a power amplifier, and a radio frequency coil. This application targets polyatomic molecules with complex compositions after ionization. Through active control and screening, it can generate a high-speed directional molecular flow with independently adjustable velocity and density, high gas purity, and good velocity consistency, providing a standard experimental environment simulating the orbital gas environment for space metrology instruments.

A method of manufacturing a distributed feedback laser apparatus has the steps: fabricating (512) a plurality of distributed feedback lasers on a wafer substrate, each laser comprising a respective laser cavity; on-wafer testing (514) the lasers to generate respective lasers' parametric test results (516); determining (518), using the respective lasers' parametric test results, different respective fabrication modifications (520) customised to respective lasers to adjust each respective laser cavity nonuniformly to compensate for variation in the parametric test results; and performing (522) one or more wafer-level fabrication step comprising lithographic patterning on the wafer substrate having the plurality of the lasers fabricated on it, to apply the different respective fabrication modifications to the respective lasers.

The invention provides a vacuum-tight enclosure for a beam apparatus, a beam apparatus, and a method for manufacturing a vacuum-tight enclosure. The vacuum-tight enclosure (100) is essentially formed of: a beam input interface (101) for receiving a molecular or atomic beam (7), a first optical interaction volume (140), a microwave cavity (120), a second optical interaction volume (150), a straight hollow beam enclosure (130) for enclosing the molecular or atomic beam (7) between the first optical interaction volume (140) and the second optical interaction volume (150), and a vacuum source interface (109), and a plurality of optical port interfaces (159), such that a vacuum is generatable within the vacuum-tight enclosure (100) when a vacuum source (1080) is vacuum-tightly attached to the vacuum source interface (109), a beam source container (1070) is vacuum-tightly attached to the beam input interface (101) and the plurality of optical port interfaces (159) are vacuum-tightly sealed.

Embodiments herein describe using compressed source material to perform an atomic experiment or an atomic application within a vacuum chamber (e.g., an atom cooling and trapping apparatus). Source material is often refined and sold with dendritic or crystalline surfaces that result in a very large surface area. This surface area increases the likelihood that a large amount contaminants will form on the surface, which is especially true for reactive source materials. To mitigate the risk of contamination, in the embodiments herein the source material is compressed onto a substrate. This changes the material from having a dendritic or crystalline surface to a flat surface, which has a much smaller surface area and thus is less susceptible to contaminants which can, for example, improve the lifetime usage of the source material.

The present application relates to the technical field of aerospace space metrology, and in particular, to a polyatomic molecular directed beam generation device, comprising a directed beam generation chamber, wherein a radio frequency ion source, an ion acceleration module, an ion screening module, an ion neutralization module and an ion absorption module which are arranged in sequence in an axial direction are provided inside the directed beam generation chamber, a radio frequency generation and pulse modulation module is provided on the outer wall of the directed beam generation chamber, and the radio frequency generation and pulse modulation module comprises a radio frequency signal generator, a pulse modulation module, a power amplifier and a radio frequency coil. According to the present application, for polyatomic molecules with complex compositions after ionization, a high-speed directed molecular beam with independently adjustable velocity and density, high gas purity and good velocity consistency can be formed by means of active regulation and screening, which can provide a standard test environment simulating an orbital gas environment for a space metrology-related instrument.

One example includes a MOT system. The system includes first optical source configured to provide a plurality of first optical beams parallel to a central axis associated with the MOT system, and a first set of optics configured to focus the first optical beams to the central axis through a trapping region comprising a vapor of atoms. The system also includes a second optical source configured to provide a plurality of second optical beams parallel to the central axis associated with the MOT system, and a second set of optics configured to focus the second optical beams to the central axis through the trapping region. Each of the second optical beams can be coaxial with a respective one of the first optical beams, such that each of the first optical beams is counterpropagating with a respective one of the second optical beams.

The invention discloses a terahertz radiation source device and system. The terahertz radiation source device comprises a substrate; the barrier layer is stacked on the substrate; the channel layer is stacked on the barrier layer, and two-dimensional electron gas is generated in the channel layer above the interface of the barrier layer and the channel layer; the source electrode, the drain electrode and the grid electrode are arranged on the channel layer, the source electrode and the drain electrode are distributed on the two sides of the grid electrode, and the source electrode and the drain electrode are electrically connected with two-dimensional electron gas. Two-dimensional electron gas is electrically connected with the source electrode and the drain electrode through the channel layer, ohmic contact resistance can be reduced, saturation current can be increased, energy conversion efficiency can be improved, and output power can be improved.

The application discloses a three-frequency signal generation system and method based on an integrated optoelectronic oscillator, which comprises a laser, a first optical coupler, a loop one, a loop two, a second optical coupler and a third photoelectric detector, and two uploading and downloading type micro-ring resonators are contained in the loop one and the loop two. The system generates two microwave signals with different frequencies through the laser, the first optical coupler, the loop one and the loop two, and combines two light signals filtered out from the downloading ends of the two micro-ring resonators through the second optical coupler and outputs the combined light signal to the third photoelectric detector for frequency beating to generate a third microwave signal, and the frequency of the third microwave signal is the sum or difference of the frequencies of the first and second microwave signals. The application can generate a high-quality three-frequency signal with adjustable frequency, realizes the miniaturization and integration of the optoelectronic oscillator, reduces the volume and weight of the optoelectronic oscillator system, lowers the system cost and is suitable for more application scenarios.

The invention discloses a high-power magnetron microwave mutual coupling forming method and system based on a transmission line, and belongs to the field of magnetron control technology and microwave synthesis. According to the magnetron array, interconnection of the magnetron pieces is achieved through the coupling waveguide or the H-T waveguide, the transmission coefficient of the H-T waveguide or the coupling waveguide is adjusted to be within the range of-7 dB to-14 dB, and frequency locking and phase locking of the magnetron array are achieved. According to the scheme, the use of a circulator is reduced, the cost is greatly reduced, the weight and the size of the whole system are reduced, and the effect of lightweight microwave synthesis is achieved.

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.