38results 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 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.

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 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.

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 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 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.

The invention provides a high-performance multi-element integrated cold atom molecule experiment platform, a first-stage vacuum cavity and a second-stage vacuum cavity are both in a 4n-polygon cylinder shape, n is an integer greater than or equal to 2, the first-stage vacuum cavity is provided with a first-stage cooling light incidence window, a first-stage cooling light reflection window, a permanent magnet and a Zeeman reducer, and the second-stage vacuum cavity is provided with a second-stage cooling light reflection window. Secondary cooling light incidence windows are arranged on the cylindrical side surface, the upper end surface and the lower end surface of the secondary vacuum cavity, and magnetic field coils are arranged on the outer walls of the two end surfaces. Atoms are sprayed out of an atom reaction furnace, the atoms precooled by a Zeeman reducer are captured in a first-stage vacuum cavity, captured atomic groups are pushed to a second-stage scientific vacuum cavity through a differential tube by a beam of pushing laser and enter the second-stage scientific vacuum cavity, and the atomic groups are separated from the second-stage scientific vacuum cavity by regulating and controlling the laser entering from a reserved optical window. And in cooperation with a magnetic field, ultra-cold atoms can be cooled, imprisoned and prepared. According to the method, the universality of multi-atom co-preparation is improved, and full-scene coverage from basic quantum simulation to frontier quantum calculation is also realized.

The present application relates to the field of terahertz semiconductor devices, and specifically discloses a terahertz device epitaxial structure, a preparation method thereof and a terahertz device. The terahertz device epitaxial structure comprises a substrate, a buffer layer, a lower contact layer, a first active layer and an upper contact layer which are sequentially stacked on the substrate; the first active layer is a periodic structure, each period comprising a first GaN well layer, an Al x Ga 1‑x N well layer and an Al y Ga 1‑y N barrier layer which are sequentially stacked; and x<=0.6y. The present application can improve responsivity.

This invention discloses a target-shooting device and method for obtaining ultra-high contrast laser beams, comprising a first plasma mirror (1), a second plasma mirror (2), and a target (3), wherein the first plasma mirror (1) reflects the laser beam to the second plasma mirror (2), and the second plasma mirror (2) reflects the laser beam to the target (3). The device and method for obtaining ultra-high contrast laser beams according to this invention have many advantages, such as high laser reflectivity, high contrast enhancement, small footprint, and fewer optical path components.

The present invention appropriately controls the distribution of charged particles in an ion source. To this end, the present invention comprises: a plurality of plasma generation units (140) each provided with a magnetic flux generation unit (143); an expansion chamber (160) that is connected to the plurality of plasma generation units and emits charged particles; and a magnetic path member (150) through which the magnetic flux generated by the magnetic flux generation units passes. Defining a first magnetic flux density (B) to be the magnetic flux density in an interior space of the expansion chamber and defining a second magnetic flux density (B0) to be the magnetic flux density in the interior space of the expansion chamber in the case of having removed the magnetic path member, the magnetic path member is formed such that the magnetic flux density ratio (B / B0) at a central axis (CL-P) of the expansion chamber and the magnetic flux density ratio (B / B0) at the periphery of the expansion chamber are different.

The application provides a kind of all-optical cold atom preparation device and method, it is related to super low temperature atom technical field.The device includes: optical switch and vacuum cavity;Vacuum cavity is provided with atom furnace, screening device and catcher;Wherein, in the first direction, the first central region of screening device and the second central region of catcher are collinear;In the second direction perpendicular to the first direction, screening device is arranged at the output position of atom furnace;Optical switch is fixedly arranged outside the vacuum cavity;Atom furnace is used to generate initial atom in the second direction, and sends initial atom to screening device;Screening device is used to carry out isotope screening to initial atom, obtains target atom, and sends target atom beam to catcher;Optical switch is used to emit laser beam, laser beam passes through the atom transmission path in the first direction between screening device and catcher, and laser beam is used to control the direction of target atom beam;Catcher is used to capture and cool target atom, and obtain cold atom.

The invention relates to a microwave oscillator and a preparation method and a driving method thereof. The microwave oscillator comprises a substrate, a heavy metal layer, a free layer, an insulating layer, a fixed layer and a first electrode, the heavy metal layer is located on the substrate, and the free layer is located on the side, away from the substrate, of the heavy metal layer. The barrier structure of the free layer comprises an edge part, an annular concave part and a middle convex part. The potential barrier height of the edge part and the potential barrier height of the middle protruding part are larger than the potential barrier height of the annular concave part. The free layer comprises a magnetic Hopv quantum, and the magnetic Hopv quantum is located in the annular recessed part. The insulating layer is located on one side of the free layer away from the substrate, the fixed layer is located on one side of the insulating layer away from the substrate, and the first electrode is located on one side of the fixed layer away from the substrate. According to the technical scheme, the robustness and reliability of the microwave oscillator in a complex working environment can be remarkably enhanced, and the microwave oscillator can output a high-frequency microwave signal.

The application discloses a high-flow integrated low-speed atomic source generating device and a generating method thereof. The integrated Zeeman magnetic field coil is wound by a metal wire, and a very smooth Zeeman magnetic field gradient can be obtained by inputting one current; the cooling laser is only one beam, the action dissonance range is large, and the adjustment precision requirement is low; the low-speed atom is generated by the Zeeman deceleration method, the high-speed atom sprayed from the atomic furnace can be directly used, and most of the high-speed atoms are converted into low-speed atoms; the cooling laser improves the proportion of the thermal atom cooled by the Zeeman magnetic field gradient; the integrated Zeeman magnetic field coil and the center position of the atomic furnace are staggered with the center of the vacuum cavity in the x direction, and the effect that the atom beam current can be effectively captured and the atom beam current does not hit the captured atom can be achieved; the atom beam current switch can be selected to be closed, and the atom beam current is completely isolated; the low-speed atomic isotope is selected by selecting the appropriate cooling laser frequency.

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 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) comprising a U-shaped portion, 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.

The invention belongs to the technical field of quantum precision measurement, and particularly discloses a high-precision cascade temperature control atomic furnace device and a use method thereof.The device comprises a furnace body, a crucible, a water cooling system and a heat shielding layer; wherein the furnace body is used for placing a crucible; the crucible is used for placing metal elements and heating the metal elements to generate atomic vapor to form atomic beams; the heat shielding layer is used for shielding the heat flow influence of the outside on the atomic beam current; the water cooling system is used for being arranged on the outer side of the heat shielding layer to ensure that the outer layer of the heat shielding layer is in a constant temperature state, and unstable heat exchange between the heat shielding layer and the external environment is completely eradicated; the technical problem that the temperature control of an atomic beam furnace is affected by external environment fluctuation caused by direct contact between heat shielding layers arranged in an atomic beam furnace vacuum device is solved.