55 results about "Whispering gallery" patented technology

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 provides an acoustic signal detection system based on an echo wall mode microcavity acoustic sensor. The acoustic signal detection system can be applied to the technical field of acoustic signal sensing and detection. The acoustic signal detection system comprises an echo wall mode microcavity acoustic sensor used for performing amplitude and phase modulation on predetermined polarization modulation light to obtain output light under the condition that an external acoustic signal acts on the echo wall mode microcavity acoustic sensor and the predetermined polarization modulation light passes through the echo wall mode microcavity acoustic sensor; the detection unit is used for performing coherent processing on the output light based on the predetermined reference light to obtain two paths of target signals, and the two paths of target signals are related to the target transmission amount and the target phase amount; the processor is used for analyzing the two paths of target signals to obtain target transmission quantity and target phase quantity; and according to the target transmission amount, the target phase amount and a plurality of first target formulas, an external sound signal is obtained, and the plurality of first target formulas represent the incidence relation between the target transmission amount and the external signal and the incidence relation between the target phase amount and the external signal.

The invention provides a terahertz echo wall mode waveguide on a light control chip, which comprises an echo wall mode micro-ring, a straight waveguide and a conical coupling waveguide which are integrated on the same substrate, and a solid-state laser source positioned above the micro-ring. And the conductivity and the inherent loss of the high-resistance silicon micro-ring are dynamically changed through the photon-generated carrier effect, so that switching of an echo wall mode among an over-coupling state, a critical coupling state and an under-coupling state is accurately and continuously regulated and controlled. According to the invention, based on an active regulation and control mechanism of a photoconductive effect, large-depth and high-speed dynamic control of terahertz signal transmission amplitude and phase can be realized, the bottleneck of low integration level and limited modulation performance of an existing terahertz regulation and control device is solved, and a key technical scheme is provided for realizing a high-performance on-chip terahertz switch, an attenuator and a modulator.

The invention reduces the energy level of fast-ignation lasers required for whispering gallery mode magnetic inertial fusion to the millijoule level by applying dual-wavelength laser irradiation to the central plate of a cryogenic deuterium target, which is typically a cubic target. In the center of the cubic target located in a biased magnetic field, there is a nanometer hole for generating a new magnetic field. The target also contains lithium nanoparticles that enhance energy deposition and produce tritium through lithium-neutron reactions, further improving the overall efficiency of the fusion process.

The invention belongs to the technical field of liquid crystal laser sensing, and relates to an estradiol detection device based on a liquid crystal-gold nanoparticle laser sensor. The optical flow control optical fiber is used as an echo wall resonator. In order to realize an estradiol sensing function, the DNA aptamer is modified on the inner surface of the optical flow control optical fiber to realize specific capture of estradiol. After the aptamer is combined with estradiol, the interaction between the aptamer and estradiol triggers the aptamer imaging change, so that the liquid crystal molecule realizes the conversion from a bipolar type to a radial type, and the conversion leads to the reduction of the refractive index, thereby causing the blue shift of the spectrum. By virtue of a local disturbance effect based on the gold nanoparticles, a quadruple synergistic effect of hyperpolarizability change of modified biomolecules, liquid crystal molecule orientation and echo wall mode resonance, an opportunity is provided for sensing and amplifying subtle detection of a target binding event. The problem of low sensitivity caused by common naked eye observation or wide spectrum monitoring in a liquid crystal microdroplet sensor is solved.

The application discloses a kind of preparation device and preparation method of disc type crystal echo wall cavity, belong to optical material processing technical field.The device includes processing tool, the upper surface of processing tool is provided with recess for processing crystal echo wall sample, the curvature radius of groove bottom is slightly smaller than the radius of crystal echo wall sample, for grinding and polishing processing of crystal echo wall cavity, crystal echo wall sample has completed milling and grinding molding;Grinding, polishing crystal echo wall sample to be placed in the recess of processing tool, the top of crystal echo wall cavity sample is vertically provided with sample fixing rod for fixing itself, the bottom of processing tool is connected with coaxial motor through transmission shaft;Crystal echo wall cavity is finely ground, rough polished and fine polished using processing tool, to realize the processing of crystal echo wall cavity.It is convenient to use, and the application range of material is large, which can significantly reduce the preparation cost and shorten the preparation period.

The application provides a preparation method and a centering device of a size-controllable ultrathin high-quality echo wall optical crystal microcavity, and the method comprises the following steps: cutting a crystal material into a wafer and grinding and thinning the crystal thickness by using a polishing disc; placing an optical crystal microcavity blank on a microscope stage, adjusting two-dimensional adjustment knobs of the stage, and making the center of the optical crystal microcavity blank coincide with an origin of an objective micrometer scale; making a clamping rod with an adhesive adhered to a bottom end penetrate a top end through hole of a clamping rod fixing frame, and making the clamping rod align with the origin of the objective micrometer scale; adjusting the height of the clamping rod, making the optical crystal microcavity blank be pasted and fixed on the bottom end of the clamping rod by ultraviolet curing glue, and completing centering; taking the clamping rod off the clamping rod fixing frame, chamfering an outer circle of the optical crystal microcavity blank; grinding the outer circle surface of the optical crystal microcavity wafer by using sandpaper; polishing the optical crystal microcavity wafer, and obtaining the optical crystal microcavity based on the polished optical crystal microcavity wafer.

The present application relates to the technical field of resonant frequency control, and particularly relates to a whispering gallery mode microcavity resonant frequency regulation method and system. The present application analyzes resonant frequencies, temperature data and resonant wavelength movement amounts at different monitoring moments, and obtains coupling influence degrees at each monitoring moment; according to resonant frequency distributions in a time neighborhood range of each monitoring moment, it is judged whether the time neighborhood range needs to be extended; if so, a target function of resonant frequency change rate is constructed in combination with a corresponding preset time extension amount; according to change trends of the preset time extension amounts in the time neighborhood ranges before and after the moment, and the coupling influence degree distributions of different monitoring moments in the preset time extension amounts, a restriction condition of the target function is constructed, and the preset time extension amount is obtained; and the regulation of the microcavity resonant frequency is realized. The present application obtains a suitable heating duration in the heat reflux regulation process, and improves the accuracy of the resonant frequency regulation.

The application provides a repetition frequency tuning system and a frequency stabilization method based on a microcavity soliton optical frequency comb, which comprises: a pump laser generation module, which is suitable for providing continuous pump laser; a pump laser feedback module, which is suitable for monitoring the pump laser in real time, so that after the microcavity soliton optical frequency comb is generated, a first error signal is transmitted to the pump laser generation module to lock the frequency of the pump laser; a whispering gallery mode microcavity, which is suitable for providing a reaction space for generating the microcavity soliton optical frequency comb based on the pump laser generated by the pump laser generation module; an auxiliary laser generation module, which is suitable for providing auxiliary laser for inhibiting the thermal effect in the whispering gallery mode microcavity and transmitting the auxiliary laser to the whispering gallery mode microcavity, so that the generation of the auxiliary microcavity soliton optical frequency comb and the adjustment of the local dispersion in the whispering gallery mode microcavity are realized; and an auxiliary laser feedback module, which is suitable for monitoring the repetition frequency in real time and transmitting a second error signal to the auxiliary laser generation module, so that the tuning and locking of the repetition frequency are realized.

The present invention discloses a multi-quantum dot coupling device and its preparation method. The multi-quantum dot coupling device comprises a microdisk microcavity and several quantum dots located within the microdisk microcavity. The microdisk microcavity exhibits a degenerate optical whispering gallery mode, and the quantum dots are located at the antinodes of the optical whispering gallery mode of the microdisk microcavity. The wavelengths of the transitional luminescence emitted by the several quantum dots are the same or similar. The microdisk microcavity has a smooth and symmetrical surface and comprises a dielectric disk. Implementation of the present invention can improve the coupling efficiency between quantum nodes and has broad application in the field of quantum communication technology.

The application provides a semiconductor whispering gallery microcavity bistable laser, and belongs to the technical field of optical fiber communication and semiconductor lasers, and comprises an N electrode, an N-type substrate located on the N electrode, a whispering gallery microcavity located on the N-type substrate and comprising a polygonal cavity and a straight waveguide structure, and the laser whispering gallery microcavity is a three-layer stacked structure, and from bottom to top, the three-layer stacked structure is an N-type confinement layer, an active layer and a P-type confinement layer in sequence; a P electrode is located on the P-type confinement layer; and a vertical polygonal through hole is arranged in the middle of the whispering gallery microcavity. The semiconductor whispering gallery microcavity bistable laser provided by the application can significantly improve the quality factor (Q value) of the mode in the resonant cavity, realize low-threshold lasing, realize bistable stable output, has the advantages of controllable mode, small volume, simple process, high yield, low cost and the like, and has important application value in the field of optical communication and the like.

The application provides a laser and a mode locking method based on a discrete echo wall microcavity, and relates to the technical field of lasers.The laser provided by the application comprises a pumping source, a resonant cavity packaging module and a feedback control module;the resonant cavity packaging module comprises a polarization maintaining fiber group, a phase modulator and an echo wall mode resonant cavity which are packaged in a shell;the polarization maintaining fiber group is coupled to the echo wall mode resonant cavity at a fixed distance;and the feedback control module is used for mode locking the resonant cavity packaging module.The laser and the mode locking method provided by the application design corresponding structures based on a discrete echo wall microcavity, solve the problem of precise coupling between an external cavity module and a laser chip, make the laser easy to assemble and deploy by realizing modular design, provide an adaptive compensation algorithm to enhance the locking effect, and provide a mode selection function for laser users to better support research in the fields of communication and calculation.

The present disclosure relates to the technical fields of optical fiber communications and semiconductor lasers, and provides a coupled-cavity semiconductor laser. The coupled-cavity semiconductor laser comprises: a whispering gallery mode microcavity for outputting a whispering gallery mode; and a Fabry-Perot cavity, a first end of the Fabry-Perot cavity being connected to the whispering gallery mode microcavity, wherein a resonant mode of the Fabry-Perot cavity is coupled to the whispering gallery mode, and a light beam in a coupled mode is outputted from a second end of the Fabry-Perot cavity.

The invention provides a laser locking system and method based on an echo wall mode crystal microcavity, and is applied to the technical field of laser light sources, and the system comprises a laser source which is used for generating initial laser output; the photon locking module is optically connected with the laser source and used for locking the frequency output by the initial laser to a cavity resonance mode of the echo wall mode crystal microcavity to obtain narrow-linewidth laser, and the narrow-linewidth laser is used as seed laser output by the photon locking module; the atomic frequency stabilization module is optically connected with the photon locking module and is used for receiving the seed laser and generating an atomic error signal representing the deviation between the seed laser and an atomic transition spectral line; and the piezoelectric material is fixed on the echo wall mode crystal microcavity and is used for adjusting the resonant frequency of the echo wall mode crystal microcavity in real time according to the atomic error signal, so that the laser frequency of the seed laser is locked to an atomic transition spectral line. According to the invention, high precision and stability of laser frequency can be realized.

Disclosed are a mode-locked resonator according to an embodiment and an ultrashort pulse laser comprising the mode-locked resonator. The mode-locked resonator according to an embodiment includes a resonator including a shape of a sphere; and a saturable absorber coated on a surface of the resonator, wherein the resonator is coupled with some photons traveling in a tapered optical fiber disposed near the mode-locked resonator and interacts with the saturable absorber based on a Whispering Gallery Mode (WGM).

According to the angular velocity measuring device and method provided by the invention, the sapphire microwave cavity with high symmetry and low loss characteristics is configured, two microwaves in a degenerate echo wall mode with completely symmetrical propagation characteristics can be excited, and meanwhile, due to the high Q value characteristic of sapphire, the energy loss is low and the frequency stability is high in the signal propagation process; in the rotation process, microwaves in two degenerate modes are propagated in the rotation direction, the forward direction and the reverse direction of the cavity respectively, the linear speed brought by rotation of the cavity enables the effective propagation speed of the forward mode to be synchronously increased, the effective propagation speed of the reverse mode to be synchronously reduced, and the difference between the propagation speeds can be determined through the frequency difference. Therefore, the angular velocity of the rotation of the cavity can be measured with high precision.

The application relates to an angle measurement system and method based on a double echo-wall micro-cavity structure, wherein the system comprises a tunable laser, a polarization controller, a tapered fiber waveguide, crystal cavities, an angle displacement device, interference probes, rotating probes, a photodetector and a computer; the crystal cavities are located at the thinnest position of the tapered fiber waveguide and are used for coupling light waves into the crystal cavities; the crystal cavities are two, the standing wave mode numbers formed in the two crystal cavities are the same, and the standing wave nodes in the two crystal cavities are arranged in a staggered mode; each crystal cavity corresponds to an interference probe, a rotating probe and a tapered optical fiber; the axes of the two interference probes are not parallel; and the axes of the two rotating probes are parallel. The scheme can form stable standing waves in the double crystal cavities, realize angle sensing when the micro-cavity rotates, and solve the problem that the output spectrum cannot determine the angle turning due to the circumferential periodic distribution of the single micro-cavity standing wave mode field in the single-cavity evanescent wave coupling structure.

The invention discloses an all-optical tuning packaging device based on an echo wall mode micro-bottle cavity, and particularly relates to the technical field of optical fiber sensing, the all-optical tuning packaging device comprises a substrate, the top end of the substrate is provided with a protection window, the bottom of the outer side of the protection window is movably sleeved with a fixing frame, the middle part of the top end of the substrate is provided with a fixing groove used for fixing the micro-bottle cavity, and the fixing groove is provided with an optical fiber. An air inlet mechanism is arranged in the middle of one side of the substrate, an air outlet mechanism is arranged in the middle of the side, away from the air inlet mechanism, of the substrate, and connecting pins are arranged on the two sides of the top end of the substrate; a limiting frame is integrally formed at the bottom of the outer side of the protection window, the protection window at the bottom end of the limiting frame forms a sealing clamping frame, according to the packaging device, auxiliary connection between the protection window and the base is achieved through the fixing frame, fixing screws are used for fixing, and therefore sealing and fixing between the protection window and the base are achieved; therefore, the micro-bottle cavity is packaged through the protection window and the substrate, and external environment interference is effectively isolated.

The application provides a solution concentration detection method based on a cut-corner square slit echo wall optical microcavity, utilizes a cut-corner square echo wall mode optical microcavity, and proposes a method for completing detection of the concentration of a to-be-detected substance in a slit. Compared with previous solution concentration detection methods based on other echo wall mode optical microcavities, the method has higher detection sensitivity, a smaller detection model volume and more excellent performance. The solution concentration detection is realized directly outside the optical microcavity, and a new idea is provided for development of a slit microcavity and the solution concentration detection method of the optical microcavity.

A photonic system is described that employs, e.g., a first laser generating a first optical beam at a first wavelength and a second laser generating a second optical beam at a second, different wavelength. The photonic system also includes a resonator, e.g., a whispering gallery mode (WGM) resonator, configured to receive a portion of the first optical beam and a portion of the second optical beam. The first laser is locked to a first mode of the resonator using either self-injection locking (SIL) or Pound-Drever-Hall (PDH) locking. The second laser is also locked to a second mode of the resonator using either SIL or a PDH. The first and second wavelengths (frequencies) may differ from one another by a few gigahertz (GHz) or, e.g., larger than 10 terahertz (THz). The system thus allows diverse wavelengths to be locked to one another.

The application discloses a fused quartz surface defect detection method and device based on echo wall mode resonance and belongs to the technical field of optical fibers, which comprises a 355nm pumping laser module, a homogenization and focusing module, a polarization maintaining fiber coupler unit, a near-infrared harmonic detection light source, a three-dimensional scanning platform, a spectrum analysis and signal acquisition module for collecting WGM micro-ring resonator transmission spectrum, and a control and data processing unit for realizing synchronous control, data acquisition and signal processing of the device and establishing a corresponding database between WGM spectrum characteristics and EPR signal characteristics. The application is non-contact, non-destructive, high in sensitivity and spatial resolution, and is suitable for defect screening and quality control of large-aperture fused quartz optical elements in high-power laser systems.

A method includes coupling an optical whispering gallery mode (WGM) resonator to an optical fiber by placing the optical fiber on the WGM resonator such that a contact portion of the optical fiber contacts the WGM resonator and two non-contact portions of the optical fiber extend beyond the contact portion, coupling the non-contact portions to locking screws, and adjusting positions of the locking screws to change a dimension of the contact portion.

The present disclosure provides a topological surface emitting quantum cascade laser and a preparation method thereof. The preparation method of the topological surface emitting quantum cascade laser comprises: sequentially forming a metal bonding layer, an active layer and an upper contact layer on a substrate; performing photoetching development on the upper contact layer by using a mask, coating photoresist at the patterned position of the mask, and then performing electron beam evaporation of the metal with the photoresist on the upper contact layer to form a metal layer; stripping the metal layer with the photoresist to obtain a metal topological pattern layer; and etching the upper contact layer to form an absorption boundary at the edge of the metal topological pattern layer, so as to enhance the absorption loss of the whispering gallery mode, and keep the topological surface emitting quantum cascade laser in a working state of the topological mode.

Sensing devices and methods of making the sensing devices are disclosed herein. In some variations, a sensing device may include at least one optical waveguide and at least one whispering gallery mode (WGM) resonator (1602a-c) configured to propagate a set of WGMs, where the WGM resonator (1602a-c) transmits a set of signals corresponding to the set of WGMs to the at least one optical waveguide (1601a-c). In some variations, a polymer structure may encapsulate the at least one WGM resonator and / or the at least one optical waveguide. Further, in some variations, the WGM resonator may have one or more selectable modes with different bandwidths and sensitivities for sensing, which may, for example, enable the sensing device to adapt to particular applications with particular bandwidth and / or sensitivity requirements.

The invention relates to the technical field of resonant frequency control, in particular to an echo wall mode microcavity resonant frequency regulation and control method and system. The method comprises the following steps: analyzing resonant frequencies, temperature data and resonant wavelength movement amounts at different monitoring moments to obtain a coupling influence degree at each monitoring moment; according to the resonant frequency distribution in the moment neighborhood range of each monitoring moment, judging whether the moment neighborhood range needs to be prolonged or not; if yes, a target function of the resonant frequency change rate is constructed in combination with the corresponding preset time extension amount; according to the change trend of the preset time extension corresponding to the neighborhood range of the previous and later moments and the coupling influence degree distribution of different monitoring moments in the preset time extension, constructing a limiting condition of the target function, and obtaining the preset time extension; and the resonant frequency of the micro-cavity is regulated and controlled. According to the method, the accuracy of resonant frequency regulation and control is improved by obtaining the proper heating duration in the hot reflux regulation and control treatment.

A tunable microwave source based on dual-wavelength lasing of a single optical whispering gallery microcavity includes a dual-wavelength laser having the single optical whispering gallery microcavity for generating dual-wavelength lasing with adjustable spacing, narrow linewidth and low threshold; an optical fiber or waveguide amplifier for optical signal amplification; an optical filter for optical signal and noise filtration; and a high-speed detector for generating a tunable microwave signal with narrow bandwidth. The dual-wavelength laser includes a pump source, the optical whispering gallery microcavity, an optical waveguide or a tapered optical fiber, a microcavity substrate, and a gold electrode pair. The frequency spacing of the dual-wavelength lasing is tuned by adjusting the external voltage of the gold electrode pair.

A photonic system is described that employs, e.g., a first laser generating a first optical beam at a first wavelength and a second laser generating a second optical beam at a second, different wavelength. The photonic system also includes a resonator, e.g., a whispering gallery mode (WGM) resonator, configured to receive a portion of the first optical beam and a portion of the second optical beam. The first laser is locked to a first mode of the resonator using either self-injection locking (SIL) or Pound-Drever-Hall (PDH) locking. The second laser is also locked to a second mode of the resonator using either SIL or a PDH. The first and second wavelengths (frequencies) may differ from one another by a few gigahertz (GHz) or, e.g., larger than 10 terahertz (THz). The system thus allows diverse wavelengths to be locked to one another.

A system and corresponding method of an optofluidic, high throughput, optical microresonator sensor with an extended sensing range, enabling real-time, label-free detection and interrogation of analytes in their native medium environments. The system includes a sensor such as a high-quality, WGM microresonator and / or a high-quality optical resonator, such as Fabry-Perot resonator, connected to a microfluidic channel that allows sample media to flow inside while being optically stimulated by a modulated light source to generate acoustic waves through photoacoustic effects detected by such optical microresonator sensors.

This invention relates to the interdisciplinary field of cavity magnetomechanics and quantum optics, proposing a composite cavity magnetic system and its control method based on YIG sphere-silica sphere coupling. The composite cavity magnetic system includes a microwave cavity, YIG and silica spheres of the same diameter in direct physical contact, an optical fiber coupling device, a bias magnetic field generator, a strong control field generation module, and a weak detection field module, driven synergistically by the strong control field and the weak microwave detection field. The physical contact between the YIG and silica spheres achieves direct coupling of phonon modes, constructing a composite multimode coupling system of microwave cavity photon mode—magnon mode—YIG sphere phonon mode—silica sphere phonon mode—optical whispering gallery mode. This invention utilizes the synergistic effect of magnetostrictive nonlinearity and photomechanical nonlinearity to form two independent coherent nonlinear scattering paths, resulting in more thorough destructive interference of multipath signals and significantly improving the induced transparent absorption effect.