191 results about "Laser cooling" patented technology

The invention discloses a foldable dual-beam magnetic light trap system which is mainly suitable for generating cold atoms in laser cooling. Three pairs of laser with opposite polarization and opposite travelling are formed in a vacuum chamber through reflecting incoming laser many times, and a magnetic light trap is formed under the mutual action of a magnetic field generated by an opposite Helmholtz coil. The foldable dual-beam magnetic light trap system is characterized in that multiple reflections are utilized, and laser energy is repeatedly utilized, thereby obtaining the cold atoms. Theinvention has the advantages of simple structure, easy power balance, stable atomicgroup, low input power of laser and easy adjustment, thereby providing a better cold atom resource for cold atom frequency scale, precise measurement and laser cooling physical test.

The invention provides a folding light path laser cooling atom device which is mainly composed of a vacuum tetrakaidecahedron, cooling light source assemblies, reflecting mirror assemblies, transfer mirror assemblies and anti-helmholtz magnetic field coils. The folding light path laser cooling atom device integrates a laser beam expansion collimation system, a folding light path, a polarization transformation system, the anti-helmholtz magnetic field coils and optical power real-time monitoring, six paths of laser required by a traditional laser cooling magneto optical trap is reduced to two paths of laser, the size and weight of an optical-mechanical system are reduced to the maximum degree, a space topology structure is simplified, and the optical-mechanical system is extremely good in mechanical property and thermal environment adaptability and can be applied to the severe environment of the space level. According to the folding light path laser cooling atom device, samples have passed ring die tests, such as a space level mechanical vibration test, a mechanical impact test, a thermal cycle test and a thermal vacuum test, long-term stable working can be kept, and the device can serve as a core optical-mechanical device of the laser cold atom application engineering.

A laser cooling apparatus and method. Generally, the inventive apparatus includes a mechanism for transporting sensible thermal energy from a solid state laser and for communicating waste fluorescent radiation therefrom as well. In the illustrative embodiment, the apparatus includes an optically transparent manifold (10) with an inlet port (12), an exhaust port (19) and a plurality of spray nozzles (16) therebetween adapted to direct a cooling fluid on the laser medium (20) of a laser (30). In addition, the optically transparent manifold (10) is used to permit waste fluorescent radiation to escape the confines of the laser and cooling system means such that said fluorescent radiation may be optically directed to an external heat sink such as free space.

The invention relates to atom laser cooling and atom laser capturing, in particular to a bi-color magneto-optical trap method and device for cooling and capturing atoms through lasers. According to the bi-color magneto-optical trap method and device, atom cooling and atom capturing are achieved through the bi-color lasers which work in a base-state, middle-excited-state and higher-excited-state cascading energy level, and atom pre-cooling is not needed. A step-type bi-color magneto-optical trap technology is adopted for the bi-color magneto-optical trap device, and the atoms can be directly cooled and captured from a vacuum air chamber. The step-type bi-color magneto-optical trap device can be used for cooling and capturing the alkali metal atoms, the alkaline earth metal atoms and even the rydberg atoms through the lasers; some quantum coherent effects can be directly researched in the cold atoms based on step-type bi-color dual-photon cooling, for example, the problem that correlation photon pairs are directly generated in bi-color magneto-optical traps is researched based on the rhombus-energy-level four-wave mixing effect; as for the experimental device, a bi-color magneto-optical trap experiment idea which is quite flexible and easy to achieve is initiated, and the experimental device can be conveniently applied and popularized.

A folded sheet is used as a basis for a fin array to cool laser modules. The folded sheet has flat portions that are connected in thermal contact with the laser module, and fins formed by interconnecting portions. This arrangement is highly convenient for assembly, inexpensive, and provides for highly effective heat exchange.

The present invention relates to a superfluid gyroscope apparatus based on cold atom gas quantum vortex. The superfluid gyroscope apparatus comprises a vacuum system, a laser cooling and trapping system, an excitation system, a time sequence control system, an information detection system, and an angular velocity resolving system. According to the present invention, the laser is used to cool the atom to achieve the gas-state superfluid, such that the atom collision relaxation problem in the atomic spin gyroscope is effectively solved, and the disadvantage that the superfluid gyroscope based on the liquid He quantum vortex is difficult to control is effectively overcome; and the high-throughput cold atom beam scheme of the double magneto-optical trap is used, such that the damage of the background atom in the first-stage gas chamber on the second-stage gas chamber interference environment can be avoided, and the high-throughput easily-captured atoms can be provided for the second-stage gas chamber. The present invention belongs to the technical field of novel quantum gyroscopes, and the superfluid gyroscope apparatus can be used for the superfluid gyroscope design based on the cold atom gas.

The invention provides a refrigeration coaxial light-emitting pipe core, which comprises a TO (transmission optical) pipe shell and a sealing pipe cap with a light window. The TO pipe shell comprises a pipe shell base and a laser mounting sleeve connected with the pipe shell base in a sealing way, the pipe shell base is provided with a plurality of pins electrically connected with an external system, the inner sidewall of the laser mounting sleeve is provided with a mounting platform, a heat dissipating surface of a refrigerator is arranged on the surface of the mounting platform, a refrigeration surface of the refrigerator is used for the arrangement of a laser carrier, the surface of the laser is provided with an electro-absorption modulated n laser chip, a thermistor and a backlight detector, and the light-emitting optical axis of the laser chip is arranged coaxial with the central axis OA of the TO pipe shell and is output by the light window of the sealing pipe cap. Heat dissipation of the whole device is achieved by the laser mounting sleeve instead of the base of the traditional TO pipe shell, and the problem of laser cooling is solved. The pipe core with the structure is coupled with an external optical element of the TO pipe shell to manufacture the light-emitting component with the appearance complying with multi-source agreements XMD (Xilinx microprocessor debugger) for small devices of 10 Gb/s.

The present invention provides a method and device for generation of higher-order transverse modes on the basis of atom-cavity coupling. The problem is solved that higher-order transverse modes are generated through traditional modes such as inclination of a resonant cavity mirror or a light propagation direction. In a system of coupling of an atom steam chamber and a standing wave cavity, when a pair of strong coherent coupling fields performs bi-directional radiation and passes through the atomic medium in the cavity, the refractive index of a weak cavity mode field is modulated through the medium in the cavity so as to induce the generation of the higher-order transverse modes. A higher-order transverse mode laser generation system is composed of a semiconductor laser, an optical isolator, a half wave plate, a polarization splitting prism, a total reflective mirror and a convex lens, a concave lens and a cesium atom air chamber. The method and device for generation of higher-order transverse modes on the basis of an atom-cavity coupling may be applicable to the research fields such as the preparation of seed light source on the basis of a space higher-order transverse mode correlated light field near an alkali-metal atom absorption line, accurate measurement of a small displacement through adoption of higher-order transverse modes, laser cooling and optical trapping, quantum information storage, and the like.

The invention discloses a control system and a control method capable of automatically judging and setting a laser frequency and power. According to the invention, a double-laser structure is adopted; a main control unit can automatically search and automatically judge an output frequency of a main laser according to a spectrum signal, and automatically locks the frequency onto an atom or molecule spectral line after automatically optimizing an output power of the main laser to a target power; after outputs of a slave laser and the main laser are subjected to beam combination, a beat frequency signal is generated, and the main control unit can automatically judge a size relationship of the output frequencies of the main laser and the slave laser so as to accurately and automatically judge the output frequency of the slave laser, after the output power of the slave laser is automatically optimized to the target power, a frequency locking error signal is generated by utilizing the main control unit, and in a range of 80GHz, locking on the frequency of the slave laser is implemented; and the method disclosed by the invention can be widely applied to the technical fields of fundamental researches and precision measurement of laser cooling, atomic frequency standards, an atom interferometer, a laser wavelength meter and the like.

The invention relates to the field of silicon nitride preparation and discloses a preparation method of silicon nitride powder. The preparation method comprises the steps: 1) equipment preheating, 2)material heating: putting a mixture of silicon powder and ammonia, and nitrogen in a coil of a microwave plasma preheater for mixing and preheating to 700-750 DEG C, putting the materials in a heatingarea of an inner cavity of a suspension reactor for heating continuously, and supplying an upward nitrogen vortex flow into the heating area to drive the materials to rotate, 3) reaction: dropping the materials to a reaction area, supplying the upward nitrogen vortex flow into the reaction area to drive the materials to rotate for reaction to generate silicon nitride during dropping, 4) heat insulation and cooling: allowing silicon nitride and unreacted nitrogen to enter a heat insulation cooler, cooling the materials through water cooling, then through water cooling and air cooling, and finally through water cooling, and 5) gas-powder separation. The silicon nitride powder prepared according to the method is high in purity, small in particle size and high in yield and is produced quickly, and an alpha phase content is high.

This invention relates to one solid film laser cooling structure, which comprises several modules, wherein, each module is composed of two parallel gains medium films with certain distance; each module inside has cooling structure and the draw beam is sent to film medium from two sides of module; left medium film right side and film left side are added with two diamond heat sink to form one liquid cooling channel.

The invention belongs to the technical field of die steel and particularly relates to a thermal treatment method of large P20 plastic die steel. The method comprises the following steps: (a) heating, wherein the heating temperature is 860-920 DEG C, and the heating time is 9-24h; (b) quenching, wherein at least two of the four quenching media of air cooling, wind cooling, spray cooling and water cooling are adopted in the quenching thermal treatment; and (c) annealing, wherein the annealing temperature is 520-580 DEG C, the annealing time is 12-34h, and the cross section hardness is 33-35/33-36HRC. In the thermal treatment method of P20 die steel, a technology for performing repeated quenching by different media is adopted, the internal and external grain refinement levels of a workpiece are basically consistent, the structure and cross section hardness uniformity of P20 die steel can be improved, the temperature and time parameters can be adjusted according to the cross section size thickness, and relatively high performance and dimensional stability of the product can be maintained in practical production.

A cryogenic cooling apparatus for high average power laser oscillator or amplifier, wherein the oscillator or amplifier material is in direct contact with a flowing cryogenic liquid cooled to below its boiling point is described. This method of cooling overcomes the limit in heat flux due to the onset of film boiling, thereby allowing for increased laser average power.

A laser cooling system includes a first tubing, a second tubing, and a cold plate assembly including a first channel to receive the first tubing and a second channel to receive the second tubing. A joint removably couples the first tubing to the second tubing and at least one component mounted on the cold plate assembly over the first tubing or the second tubing. The inlet end of the first tubing receives a cooling fluid and an outlet end of the second tubing discharges the cooling fluid after the cooling fluid flows through the first tubing, the joint, and the second tubing to maintain uniform a temperature of the at least one component mounted on the cold plate assembly.

The invention relates to the frequency stabilizing technology for laser devices, and in particular relates to an offset frequency stabilizing device and an offset frequency stabilizing method using gas-solid interface sub-Doppler reflection spectrum. The technical problem that in the existing laser frequency lock technology, the lock bandwidth is narrow and cannot reach the detuning quantity required by locking is solved. The problem that in the existing laser frequency stabilizing technology, the laser stability is limited due to the influence of Doppler frequency shift and the lock bandwidth is limited when saturated absorption spectrum is used for locking frequency is effectively solved, and meanwhile the influence of residual modulation which occur in most laser frequency stabilizing methods as the laser devices need to be modulated is avoided. Detuning of the lock position can be effectively controlled by temperature and magnetic field. The offset frequency stabilizing device and method using gas-solid interface Sub-Doppler reflection spectrum are applicable to the fields of high resolution atomic spectrum research, laser cooling and atom trapping experience, research of interaction of atom and medium interfaces and offset frequency lock laser devices. According to the offset frequency stabilizing device and method using gas-solid interface Sub-Doppler reflection spectrum provided by the invention, the miniaturized experimental facility and weak light intensity can meet the requirement of commercial technology popularization.

The invention provides a cylindrical microwave cavity of a diffuse reflection laser cooling atom, wherein the cylindrical microwave cavity is applied to a miniaturized space cold atomic clock. The cylindrical microwave cavity is formed by connecting an upper cover and a lower base through screws. The cylindrical microwave cavity is utilized to achieve the effects of the cooling atom and a microwave resonant cavity, has the advantages that a central zone of the cooling atom of a cylindrical cavity is high in cold atomic density and the cylindrical resonant cavity is high in quality factor and easy to machine, can simplify the structure of the cold atomic clock greatly, reduces the weight of the atomic clock, and improves the signal to noise ratio of clock signals and system stability.

Methods for cooling fluorescent material are provided. A first method includes providing a sample of the material having an elongated direction of light propagation, exhibiting fluorescence at a mean fluorescence wavelength and capable of emitting superradiant pulses with a formation delay time. The method then involves generating a pump pulsed laser beam having a wavelength longer than the mean fluorescence wavelength, a pump power at which superradiant pulses are emitted and a pulse duration shorter than the formation delay time. The pulses are directed onto the sample along the direction of light propagation to produce the superradiant pulses in an anti-Stokes process inducing a cooling of the sample. A second laser cooling method includes a combination of a traditional anti-Stokes cooling cycle and an upconversion cooling cycle, wherein the two cooling cycles act cooperatively to cool the sample.

A multi-wavelength semiconductor laser operating system comprises a semiconductor laser source. The semiconductor laser source is connected with a medical laser optical fiber and electrically connected with a laser power source and a control system, and the laser power source and the control system are electrically connected with a laser cooling system and electrically connected with a pedal switch. In the working process, an indicating light source gives out an indicating laser, and the laser is shaped and coupled and then enters the optical fiber; a single tube semiconductor laser device is controlled by treading the pedal switch to give out a laser, the laser is shaped and coupled and then enters the optical fiber, the working laser and the indicating laser are coupled into one beam of light which enters the medical laser optical fiber, the pedal switch is treaded down to output the laser, the cutting operation and hemostasis are carried out at the same time, and the multi-wavelength semiconductor laser operating system has the advantages of being safe, reliable, small in heat harm, good in hemostasis effect, long in service life, good in stability and convenient to carry and apply.

The invention relates to a cutting machine, in particular to a laser cutting machine for reflective strip production. A feeding device (1-1) is arranged on the upper portion the left side of a cutting device (1). A laser cooling device (1-2) is arranged on the right side of the feeding device (1-1). A metal tube laser emitter (1-3) is arranged on the right side of the laser cooling device (1-2). An air suction device (1-7) is arranged on the right side of a synchronous motor (1-6). A draught fan (1-8) is arranged on the rear side of the air suction device (1-7). A hole belt (1-13) is arranged below the metal tube laser emitter (1-3). The air suction device (1-7) is arranged on the lower portion of the hole belt (1-13). A belt tightness degree regulator (1-12) is arranged at the right end of a fixed support (1-11). According to the laser cutting machine for reflective strip production, a metal tube laser device is used for replacing a traditional glass tube laser device, a coder achieves synchronization of production numerical control, conveyance and cutting, and generation of material indentations is avoided due to the arrangement of the air suction device.