530 results about "Optical cavity" patented technology

The invention provides a cavity adjusting method and device for a laser gyroscope resonant cavity, and the method comprises the following steps: building a light beam loop: horizontally placing a resonant cavity substrate on a supporting seat, and forming the light beam loop with two plane reflectors and two spherical reflectors; light beam introduction: starting a sweep frequency laser assembly, and enabling the reference light beam to enter a resonant cavity light path after passing through a light beam collimation system; light spot form monitoring and coarse adjustment: after a light beam emitted by the resonant cavity is collected by an image collector, the main control computer analyzes the light spot form and judges the imbalance state, evaluation information is fed back to the control system, the control system adjusts the inclination amount of the horizontal dimension and the pitching dimension of the light beam in the light beam collimation system according to the feedback information, and the light spot form is obtained. And the light spot is located at the center of the cavity mirror to finish coarse adjustment of the cavity. According to the method, coarse cavity adjustment can be completed without depending on a complex optical cavity technology, the cavity adjustment time is greatly shortened, the overall operation is simple, and the cavity adjustment efficiency is improved.

The invention discloses a mixed gas absorption spectrum analysis method and system based on variational mode decomposition, specific laser is injected into an optical resonant cavity unit, and a detector unit continuously monitors the light intensity change and records a light intensity attenuation signal; pre-processing the recorded light intensity attenuation signal; carrying out VMD decomposition on the preprocessed ring-down signal to obtain a plurality of IMF components, respectively introducing CO2 and CO gases with known concentrations into the optical resonance unit, and recording spectral data of each single gas component; calculating the similarity and contribution degree of each IMF component, and setting a weight combination to form a joint score; the gas with the highest joint score is selected, the score is compared with an adaptive threshold value, and when the score is higher than the adaptive threshold value, the IMF component is marked as the characteristic component of the corresponding gas; and finally, gathering and outputting the marked IMF components according to gas types to obtain characteristic signals of the gases, thereby realizing multi-component gas separation in the mixed gas absorption spectrum.

An optical parametric oscillator and method for generating coherent signal light involve a resonant optical cavity for coherent signal light, and in the cavity a non-parametric gain element for amplifying the coherent signal light to only partially compensate for passive optical roundtrip losses, thereby obtaining lower effective roundtrip losses. A parametric gain element is arranged in the cavity, for converting coherent pump light into coherent signal light through an instantaneous nonlinear optical interaction. The parametric oscillator has means for adjusting an intracavity optical power of the coherent pump light above a threshold value, where the parametric gain is balancing the effective roundtrip losses, thus inducing sustained oscillations of the signal light in the optical cavity. The non-parametric gain element is configured to have a limited non-parametric gain over a gain bandwidth of the parametric gain element, which is less than the passive optical roundtrip losses in the gain bandwidth.

The invention provides a transcendental extreme ultraviolet light source device which comprises a free electron laser main body which comprises an undulator system and an optical resonant cavity. The undulator system comprises a modulation section undulator and a radiation section undulator; the optical resonant cavity comprises resonant cavity reflectors and a dispersion section, and the modulation section undulator, the dispersion section undulator and the radiation section undulator are sequentially arranged in the direction of an electron beam and are all located between the resonant cavity reflectors; the resonant wavelength output by the radiation section undulator is 1 / h of the resonant wavelength of the modulation section undulator, h is the harmonic number, and when the resonant wavelength output by the radiation section undulator is 6-7nm, the radiation wavelength reflected by the resonant cavity is h times of the resonant wavelength output by the radiation section undulator, so that the resonant cavity is prevented from adopting a reflector with the reflection wavelength of 6-7nm. According to the device, the radiation of the target wavelength is output by using harmonic waves, and a reflector with relatively long wavelength and mature technology can be directly used; various accelerators are compatible, the energy efficiency of the accelerators is greatly improved, and power consumption is reduced.

A continuous-wave perovskite polariton laser device, including an optical microcavity, a spacer layer, and a gain medium. The gain medium is a perovskite material or a composite material containing perovskite, in a form of thin film, microcrystal, phosphor, nanocrystal, quantum dot, or single crystal. The perovskite gain medium is prepared by solution process or vacuum deposition technique, and is combined with an optical resonator. By exploiting the strong interaction between excitons and photons, a steady-state exciton-polariton condensation is formed, enabling the generation of continuous-wave polariton laser emission with a low threshold. The laser device can achieve low-threshold continuous-wave or pulsed lasing emission at room temperature under various light sources pumping or electrical excitation. Its threshold is 1 to 3 orders of magnitude lower than that of conventional semiconductor lasers, with an optimized threshold as low as 0.1 to 1 W / cm2, representing a novel ultralow-power coherent light source technology.

An optoelectronic device that includes a substrate and a stack of organic layers that has at least one active layer arranged between a reflective surface and a semi-reflective surface arranged facing one another at a given distance and forming an optical cavity. The device includes at least three groups of pixels, each group of which is characterized by a cavity of a different optical length, the cavity having a number of bilayers arranged between the substrate and said stack of organic layers, each bilayer being formed of a first transparent and conductive layer of a first transparent and conductive material, and of a second transparent and conductive layer of a second transparent and conductive material, in direct contact with the first transparent and conductive layer.

The invention provides a method and a system for realizing a weak measurement enhanced chip-level microcavity gyroscope. The method comprises the following steps of: 1, providing a coherent state input by a system by using a single-frequency laser; 2, the output of the single-frequency laser is switched between a first path and a second path through an optical switch, the laser beam is transmitted to the first path in the first half part of the period, and the laser beam is transmitted to the second path in the second half part of the period; 3, the light transmitted along the first path and the second path respectively passes through an optical resonant cavity to sense the rotation angular speed, and a weak value amplification effect is achieved by setting front and back selection states; and step 4, weak measurement enhanced output results transmitted along the first path and the second path are respectively received by a photoelectric detector, and the value of the rotation angular velocity is demodulated according to the obtained output results. According to the invention, the optical microcavity is used as a sensing unit of the gyroscope, the sensing performance of the integrated optical gyroscope is greatly enhanced through a weak measurement technology, and the whole set of system can realize chip-level integration.

A quantum memory device 100 for storing a signal field 170 comprises an optical cavity comprising a first and second reflective surface 110, 120, a first and a second optical element 130,140 within th

The present application relates to an external cavity narrow linewidth laser assembly, comprising: a substrate, to which a gain chip for emitting laser light is fixedly connected; a first light-transmitting reflector and a second light-transmitting reflector, spaced in sequence and located in the direction of the laser emitting end of the gain chip, are also connected to the substrate; the first light-transmitting reflector is spaced apart from the gain chip and together form a first external optical resonant cavity; the second light-transmitting reflector is spaced apart from the first light-transmitting reflector and together with the gain chip form a second external optical resonant cavity. The first and second external optical resonant cavities of the external cavity narrow linewidth laser assembly of the present application significantly increase the resonant cavity length within the limited tube shell space. The longer the resonant cavity length, the longer the coherent light length, and thus the narrower the linewidth, achieving higher performance while maintaining a low cost.

The invention provides an atypical MOPA fiber laser device integration device, system and method. The device comprises an optical resonant cavity, a first device group and a second device group, wherein the first device group comprises a first amplification stage gain optical fiber, a first reverse pumping beam combiner, a first pumping source and a first cladding light stripper, and the second device group comprises a second amplification stage gain optical fiber, a second reverse pumping beam combiner, a second pumping source and a second cladding light stripper; the optical resonant cavity is used for receiving the pump light transmitted by the first amplification stage gain optical fiber and the second amplification stage gain optical fiber, transmitting the pump light which is not absorbed to the second amplification stage gain optical fiber and the first amplification stage gain optical fiber, and generating signal light under the action of the absorbed pump light; and the signal light is transmitted to the first amplification stage gain fiber and the second amplification stage gain fiber in positive and negative directions. The device number and the manufacturing cost are remarkably reduced, the light-to-light conversion efficiency and the system reliability are improved, and meanwhile high-power beam combination and miniaturization integration are facilitated.

An FM LIDAR system is described that includes a frequency modulated LIDAR system that incorporates a laser source that is optically coupled to a whispering gallery mode optical resonator. Light from the laser that is coupled into the whispering gallery mode optical resonator is coupled back out as a returning counterpropagating wave having a frequency characteristic of a whispering gallery mode of the optical resonator. This returning wave is used to reduce the linewidth of the source laser by optical injection. Modulation of the optical properties of the whispering gallery mode optical resonator results in modulation of the frequency of the frequencies supported by whispering gallery modes of the resonator, and provides a method for producing highly linear and reproducible optical chirps that are highly suited for use in a LIDAR system. Methods of using such an FM LIDAR system and vehicle assisting systems that incorporate such FM LIDAR systems are also described.

The invention is applicable to the technical field of marine oil and gas resource exploration, and provides an intelligent monitoring system and method for carbon isotopes of wellbore gas, the system comprises an explosion-proof shell, and further comprises a gas pretreatment module for removing impurities affecting CH4 and C2H6 gas spectral lines and adjusting temperature and pressure of measured gas; the optical cavity detection module comprises a laser, a collimator, a detector and an MPC, and is used for completing the energy level excitation of the infrared light to the gas to be detected, the injection of a detection light source into the MPC from the laser, the multiple reflection of the detection light in the MPC, the built-in multi-beam laser light source, and the absorption detection of the multi-component gas through a single optical cavity; and the data processing module is used for collecting, processing, displaying and outputting the measured data in real time. The system is high in detection precision, high in environmental adaptability, high in response speed and miniaturized in equipment, and has a wide market prospect.

The invention relates to the technical field of spacecraft structure micro stress detection, in particular to a spacecraft structure micro stress detection device and a use method thereof, and the spacecraft structure micro stress detection device comprises a displacement amplification structure, a single mode fiber, a reflector, a broadband light source and a spectrum analyzer. An optical resonant cavity formed by an optical fiber end face and a lens is combined with a displacement amplification structure, when stress acts on a spacecraft structure, the cavity length of the Fabry-Perot resonant cavity changes, so that phase movement of light is caused, and accurate measurement of the stress can be achieved by detecting the phase movement. The antenna has extremely high anti-electromagnetic interference capability, and can work stably in a complex space environment. Even under the condition of violent temperature change, high measurement accuracy can be kept, and detection of tiny stress can be achieved through the amplification effect of the displacement amplification structure. And the stress characteristic signal and the background noise can be effectively separated, so that the detection reliability is remarkably improved.

A light control film includes a plurality of substantially parallel optical cavities. Each of the optical cavities has a height H along a thickness direction of the light control film and a minimum lateral dimension W along an in-plane width direction orthogonal to the thickness direction, where H≥W. The optical cavities are substantially filled with a liquid including a plurality of light absorbing particles configured to move along the thickness direction in response to one or more applied signals or fields such that the movement along the thickness direction causes each of the optical cavities to transition between a substantially opaque state and a substantially transparent state. A full viewing angle of the light control film increases when the optical cavities transition from the substantially opaque state to the substantially transparent state.

A light emitting device is provided including a wavelength conversion structure configured to convert electromagnetic radiation of a first wavelength in to an electromagnetic radiation of a second wavelength; a plurality of light sources, wherein at least one light source is configured to emit an electromagnetic radiation of the first wavelength, wherein the plurality of light sources are arranged on or above the wavelength conversion structure; and an optical metastructure configured as optical cavity comprising a resonance frequency at about the second wavelength.

The invention discloses a ring-down light cavity precision pressure control method and device based on enhanced data-driven PID, and the method comprises the steps: 1) building a ring-down light cavity pressure control device, and integrating a pressure sensor, a proportional valve, a digital multimeter, a DC power supply, a vacuum pump and other key parts; 2) acquiring a proportional valve driving voltage and a pressure feedback signal based on LabVIEW, and constructing a discrete time ARX model of the system; (3) on the basis of the model residual error and the real-time error, an enhanced data driving algorithm is adopted to carry out online self-adaptive updating on PID parameters; 4) filtering high-frequency noise by using a second-order Bessel low-pass filter to improve the signal stability; and 5) realizing closed-loop control under the LabVIEW platform, and monitoring and maintaining the operation performance of the system in real time. The method has the advantages of model self-learning, parameter self-tuning, high robustness, high control precision and the like, is particularly suitable for scenes such as high-precision spectral measurement with extremely high requirements on pressure stability, and has remarkable engineering practical value and popularization and application prospects.

The invention is suitable for the technical field of optical design parameter optimization, and provides a design parameter optimization method and system for a long-optical-path gas absorption cell, and the method comprises the following steps: carrying out the theoretical verification of the feasibility of the lens parameters of a spherical reflector based on a theoretical model of a light propagation matrix, and obtaining the design parameters of the spherical reflector; determining an initial lens parameter and a key design parameter range; an optical cavity model composed of two spherical reflectors is established, and automatic ray tracing simulation is carried out according to the initial lens parameters, the key design parameter range and a preset stepping value; the simulation data are verified, the number of light spots is determined, and the optimal key design parameter combination enabling the optical path to be maximized is screened out according to the number of the light spots. The method is mainly used for designing a long-optical-path gas absorption cell in infrared absorption spectrum trace gas sensor detection, has practical significance, realizes verification of optimal design parameters, reduces development difficulty and improves development efficiency.

The invention discloses a non-linear frequency conversion regenerative amplification device and a method thereof, and belongs to the technical field of laser non-linear frequency conversion. The device comprises a signal light injection unit, a regeneration amplification cavity unit and a pump light synchronization unit. The regenerative amplification cavity unit comprises an optical resonant cavity structure module, a polarization control module and a nonlinear action module. A time domain switch is formed through the polarization control module under the driving of the time schedule controller, and the preset number of times of circulation of signal light in the cavity is accurately controlled. And meanwhile, the pump light synchronization unit generates pump pulse string laser which is synchronous with the circulation process and has sub-pulse power increasing in sequence, so that the signal light and one corresponding pump sub-pulse are subjected to optical parametric amplification in the nonlinear crystal in each circulation. The space complexity of multi-stage amplification is converted into time domain controllability, high-efficiency and high-gain nonlinear frequency conversion is realized by using a single-stage compact structure, and the integration level and the stability of the system are remarkably improved.

A light source apparatus includes: a light source configured to output light; a reflection unit (spatial light modulator) having an input unit of a control signal and configured to be able to control distribution of angles at which incident light is reflected based on the control signal; and a diffraction grating configured to disperse the light output from the light source, cause the light to be incident on the spatial light modulator, and return at least a part of the light reflected by the spatial light modulator to the light source. An optical cavity is formed by the light source and the spatial light modulator, and a bandwidth of the light returned from the diffraction grating to the light source is controlled by controlling the distribution of angles of the light reflected by the spatial light modulator based on the control signal.

The invention provides a single-mode semiconductor laser failure assessment method and device and electronic equipment, and relates to the technical field of semiconductor lasers. The method comprises the following steps: acquiring an optical power current characteristic test curve of the failed single-mode semiconductor laser; determining an optical power parameter change trend of the failed single-mode semiconductor laser according to a preset optical power current characteristic standard curve and the optical power current characteristic test curve of the failed single-mode semiconductor laser; if the optical power parameter variation trend indicates that the optical power parameter in the working current range is zero, determining that the failure type is optical cavity surface catastrophe damage; and if the optical power parameter variation trend indicates that the optical power parameter in the working current range is non-linearly decreased, determining that the failure type is optical body material catastrophe damage, so that the failure type of the single-mode semiconductor laser can be judged through the optical power current characteristic test curve. The evaluation cost can be reduced, the evaluation efficiency is improved, and the accuracy of evaluation results is ensured.

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.

A first layer, a first spacer layer, and a second layer of a semiconductor wafer can be etched to produce a plurality of columnar structures extending from the substrate layer and including a first optical cavity situated about the first gain medium, a second optical cavity situated about the second gain medium, and a first spacer region contacting the first gain medium and the second gain medium. Also, a photonic microparticle formed from a layered semiconductor wafer and of a columnar structure having a first optical cavity situated about a first gain medium, a second optical cavity situated about a second gain medium, and a first spacer region contacting the first gain medium and the second gain medium. The first optical cavity and the second optical cavity in the photonic microparticle are each capable of generating laser light with a distinct spectral peak when energetically excited.

Hybrid integrated photonic integrated circuit laser comprising a photonic integrated circuit including an elongated optical waveguide comprising an elongated gain medium waveguide, at least a first and second optical reflector, the gain medium waveguide being located or extending between the first and second optical reflectors and being located inside an optical cavity to provide optical feedback. Further comprising a pump laser diode to provide electromagnetic radiation to the gain medium waveguide. The elongated optical waveguide, and the first and second optical reflectors are monolithically integrated inside the photonic integrated circuit. The gain medium waveguide comprises a rare-earth ion implanted silicon nitride waveguide core. The pump laser diode is positioned adjacent to the at least one photonic integrated circuit and is edge coupled or facet coupled to a lateral edge or a facet of the photonic integrated circuit to provide pump radiation to the rare-earth ion implanted silicon nitride waveguide core.

The invention relates to an optical measuring arrangement (100) for position and / or distance detection of a component relative to a reference along at least one measuring axis, comprising an optical resonator (101) which has at least one coupling mirror (102) for coupling a measuring beam (103) and an end mirror (104) enclosing a resonator cavity (105). The resonator cavity (105) has a length adjustment range, wherein the measuring beam passes through the resonator cavity (105) more than once. The optical resonator (101) has at least one optical element (108) which is configured to control, at least within the length adjustment range (107) of the resonator cavity (105), the beam radius of the measuring beam (103) at the coupling mirror (102) and / or a Gouy phase of the measuring beam (103) propagating in the resonator cavity (105).The invention further relates to a projection exposure system, a lithography system, an inspection system and a coordinate measuring machine.

This utility model relates to the field of optical detection technology and discloses a structure for improving the excitation light collection efficiency in photoluminescence measurement. It includes a base plate, a test stage at the center of the upper surface of the base plate, and a fixed bracket fixedly connected to the center of the rear side wall of the base plate. It also includes a light-emitting structure for fixing the height of the emitting light source, comprising a retainer. Vertical plates are fixedly connected to the lower surfaces of the retainer on both sides. A light-incident tube is located at the center of the upper surface of the retainer, with its lower end penetrating the upper surface of the retainer and extending to the lower end. In this utility model, by setting the light-emitting structure and fixing the measurement height, measurement errors caused by the mechanism are reduced. Light entering at a specific angle will ultimately be transmitted through the light-emitting port of the spherical optical cavity. Thus, regardless of the height of the excitation light position, the intensity of the light entering the spherical optical cavity and the intensity of the transmitted light maintain the same proportional relationship.

The application discloses a gas concentration detection method and device, a medium and an electronic equipment, and relates to the technical field of gas detection, and can reduce the error of gas concentration detection. The method comprises the following steps: collecting transmitted light intensity transmitted from an optical resonant cavity; determining a transmitted light intensity function, wherein the transmitted light intensity function is used for representing the change of the transmitted light intensity with time; fitting a medium in the optical resonant cavity based on the transmitted light intensity function and incident light intensity of the optical resonant cavity, so as to obtain an absorption spectrum of the medium; and inversely calculating the gas concentration of the medium according to the absorption spectrum.

The invention relates to the technical field of optical reflection cavities, and provides an optical reflection cavity, an optical multi-pass pool system and an optical resonant cavity system. According to the optical reflection cavity provided by the embodiment of the invention, the first sub-plane mirror is introduced into the plane-concave cavity; a first sub-plane mirror is arranged in an edge area of a main plane mirror in the y-axis direction and is inclined relative to the main plane mirror in the y-axis direction, and the length of the first sub-plane mirror in the x-axis direction is more than one time of the track width of a light beam on the main plane mirror in the x-axis direction; the light beam can be reflected by the first sub-plane mirror for more than one time, and the translation direction of the track is continuously changed after the light beam is reflected by the first sub-plane mirror, so that the reflection times of the light beam in a limited volume are increased, the optical path is increased, and the distribution density of reflected light spots is also increased. And more reflection times, higher optical path volume ratio and higher-density light spot distribution can be achieved.

An optical gate device may have one or more optical cavities. The optical cavity may have an embedded optically-active material providing strong light-matter coupling. A pump input allows application to of a pulsed optical pump beam the optically-active material. The pump beam is absorbed by the optically active material to form an exciton-polariton condensate which emits light. The optical gate device may have an input waveguide to input a seed signal to the optical cavity. The optical gate device may include an output waveguide to output of an optical signal at a wavelength corresponding to a resonant mode of a the cavity. The device may operate in a manner such that, when the pump beam is applied to the pump input, an optical output signal is selectively provided in the output waveguide, via the input of the a seed signal and light emitted by the exciton-polariton condensate.

A tunable dual-polarization and dual-frequency laser source (1) adapted to emit an output beam (FS) having a first frequency according to a first linear polarization and a second frequency according to a second linear polarization perpendicular to the first linear polarization, the laser source comprising an optical cavity (C) comprising the following elements arranged between a highly reflective element (M1) and an output coupler (M2): a second electro-optical crystal (EO2) in a second material having a second optical axis with the same direction and the same orientation as the second linear polarization and comprising a second pair of electrodes (E2) adapted to apply within the second electro-optical crystal a second voltage according to a direction of the second linear polarization,the first and second materials being adapted so that there are first and second voltages adapted to independently control a value of the first frequency and a value of the second frequency included in the output beam (FS). [Fig.3],

The present application relates to laser frequency stabilization technology, in order to solve the contradiction between chip and long-term frequency stability of on-chip frequency stabilization technology, provide a kind of long time laser frequency stabilization system based on on-chip optical reference microcavity, including: two lasers, on-chip optical reference microcavity;Two frequency locking modules are used for locking two lasers to two different modes of on-chip optical reference microcavity respectively;Dual-mode beat frequency measurement and control module is used for real-time measurement of the dual-mode frequency difference between the two different modes locked to on-chip optical reference microcavity;In-cavity temperature slow feedback control loop is used for generating temperature fine control feedback signal based on dual-mode frequency difference, and the fine temperature of on-chip optical reference microcavity is adjusted according to temperature fine control feedback signal, to compensate the optical cavity length change caused by thermo-optic effect and thermal expansion effect, so as to stabilize the resonant frequency of on-chip optical reference microcavity, reduce the long-term drift of on-chip laser light frequency, improve the long time frequency stability of laser single frequency output.