33 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 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 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 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 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 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 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.

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.

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.

Embodiments of the present application provide a double FP coupling cavity laser device and an electronic device, comprising: a first laser, the first laser having a first whispering gallery microcavity; a second laser, the second laser having a second whispering gallery microcavity; a first FP cavity, the first FP cavity being connected with the first whispering gallery microcavity; a second FP cavity, the second FP cavity being connected with the second whispering gallery microcavity; a branch waveguide, the branch waveguide having a first waveguide and a second waveguide, the first waveguide being connected with the first FP cavity, the second waveguide being connected with the second FP cavity; a coupler, the coupler being connected with the first waveguide and the second waveguide and outputting the spectrum of the first waveguide and the second waveguide after coupling; the length of the first FP cavity and the second FP cavity in a first direction is different. By setting the first FP cavity and the second FP cavity with different lengths, in combination with the synergistic effect of the branch waveguide and the coupler, the laser mode stability is effectively improved and the structure is simplified, and the advantages of precise spectrum regulation, simple preparation process are possessed.

This application relates to an asymmetric whispering-gallery mode photoelectric detection system. The system includes: a probe light source capable of emitting probe light; a microsphere whispering-gallery mode resonator, which has an asymmetric optical microcavity body, within which a microsphere for exciting a whispering-gallery mode is coupled, configured to couple the probe light to the microsphere, causing the probe light to resonate in a whispering-gallery mode within the microsphere before being output; and a spectral receiving device configured to detect the output light of the microsphere whispering-gallery mode resonator per unit time. The system of this application can realize a high-precision multi-parameter sensor, achieving microsphere resonant excitation under the Fabry-Perot optical micro total internal reflection waveguide mechanism through evanescent field coupling between the microsphere and the cavity wall of the optical microcavity. The device has a 1.068 × 10⁻⁶ m² / m² diameter. 5 It has a high Q value and features a compact structure, high durability and stable operation, simple manufacturing process, convenient packaging, easy operation and low cost.

The invention discloses a fused quartz surface defect detection method and device based on whispering gallery mode resonance, and belongs to the technical field of optical fibers. A homogenizing and focusing module; a tapering optical fiber coupling unit; an output window of the near-infrared harmonic detection light source is aligned with the tapering optical fiber coupling unit; a three-dimensional scanning platform on which a tested optical element is placed, and the tested optical element is placed in the coupling interface area; the spectrum analysis and signal acquisition module is used for acquiring a transmission spectrum of the WGM micro-ring resonator and is in signal connection with the tapered optical fiber coupling unit; and the control and data processing unit is used for realizing synchronous control, data acquisition and signal processing of the device and establishing a corresponding database between the WGM spectral characteristics and the EPR signal characteristics. The method does not need marking or dyeing treatment, is non-contact, lossless, high in sensitivity and high in spatial resolution, and is suitable for defect screening and quality control of the large-caliber fused quartz optical element in a high-power laser system.

An acoustic sensing system for an imaging system includes an acoustic probe array including at least one optical whispering gallery mode (WGM) resonator for sensing acoustic signals, at least one coupling waveguide, and a polymer, a light source coupled to a first end of the waveguide, and a light detector coupled to a second end of the waveguide. The polymer has a convex upper boundary engineered to enhance acoustic focus on the optical WGM resonator, the resonator and the waveguide each have higher refractive indices than a refractive index of the polymer, the waveguide is optically coupled to at least one optical WGM resonator, the waveguide is spaced apart from the optical WGM resonator to which it is coupled by a separation gap, and the polymer encases the optical WGM resonator an a portion of the waveguide to which it is coupled and fills the separation gap.

Systems, devices, and methods for enhanced tissue imaging and biochemical detection using near-infrared (NIR) illumination in conjunction with resonant structures, such as whispering gallery mode (WGM) resonators and dielectric waveguides are proposed that operate in either transmission mode—where NIR light passes through a target sample—or reflection mode—where reflected NIR signals are recoupled into the sensing structure. These configurations support low-cost, flexible, real-time, and high-sensitivity analysis across a broad spectrum of biological and non-biological specimens, thereby enabling applications in tissue diagnostics, immunoassay-based detection, and material characterization, including deployment in point-of-care and resource-limited environments.

The invention discloses a high-performance core-shell colloidal quantum well nanocrystal, a colloidal nanocrystal self-assembly echo wall mode laser and a preparation method thereof, and belongs to the technical field of lasers. The preparation method of the laser comprises the following steps: immersing a silica fiber into a high-performance core-shell colloidal quantum well nanocrystalline solution through a capillary effect, and after the silica fiber is fully infiltrated and filled with the high-performance core-shell colloidal quantum well nanocrystalline solution, carrying out high-performance core-shell colloidal quantum well nanocrystalline solution; the silica optical fiber is horizontally placed so that nanocrystals in the silica optical fiber can be gradually gathered at the end of the silica optical fiber along with volatilization of a solvent, the nanocrystals are self-assembled on the inner surface of the silica optical fiber to form an annularly-distributed core-shell colloidal quantum well nanocrystal film, and the echo wall type optical microcavity structure is formed. The colloidal nanocrystal self-assembly echo wall mode laser takes the high-performance core-shell colloidal quantum well nanocrystal as a gain material, the preparation method is simple and efficient, the repeatability is high, and low-threshold and high-stability CQW-WGM laser output can be realized.

The invention relates to the technical field of non-contact humidity sensors, and discloses a non-contact microwave humidity sensor based on a dielectric material echo wall mode, the non-contact microwave humidity sensor comprises a resonant cavity base and a top cover connected with the top of the resonant cavity base, and the resonant cavity base and the top cover jointly define an electromagnetic shielding cavity; the ring resonator is made of a low-loss dielectric material; the support frame is supported in the ring resonator and is connected with the bottom wall of the resonant cavity base; according to the sensor, a mature high-Q-value WGM principle of an optical wave band is combined with sensing application of a microwave wave band, intrinsic advantages of a low-loss dielectric material and an evanescent field sensing mechanism are creatively utilized, millisecond-level ultrafast response is achieved, the risk of performance degradation or failure of a sensitive coating is eliminated, and the application range of the sensor is widened. Tiny loss disturbance can be effectively identified, and the detection precision is improved.

The application relates to the technical field of non-contact humidity sensors, and discloses a non-contact microwave humidity sensor based on a dielectric material whispering gallery mode, which comprises a resonant cavity base and a top cover connected to the top of the resonant cavity base, and the resonant cavity base and the top cover jointly form an electromagnetic shielding chamber; further comprising a ring resonator made of low-loss dielectric material, a support frame supported in the ring resonator and connected to the bottom wall of the resonant cavity base; the sensor combines the mature high-Q value WGM principle of the optical wave band with the sensing application of the microwave wave band, creatively utilizes the intrinsic advantages and evanescent field sensing mechanism of the low-loss dielectric material, realizes millisecond-level ultrafast response, eliminates the risk of performance attenuation or failure of the sensitive coating, can effectively identify slight loss disturbance, and improves the detection precision.

The application relates to a design method of an echo wall mode microbubble cavity based on a WKB approximation, and belongs to the field of microcavity photonics. The method is aimed at the problems of traditional design, such as dependence on experience, difficulty in exciting high-order modes and large demand for computing power, and strict constraints are made on the propagation region of the echo wall mode by constructing an equivalent potential well. The echo wall mode microbubble cavity is divided into three regions, i.e. a cavity, a shell layer and a cavity outside, approximate solution forms of radial components of electric fields in the regions are respectively established based on the WKB approximation, and an eigen equation under the WKB approximation is obtained by using boundary continuous conditions to solve a resonant wavelength and screen effective echo wall modes that can be excited in physics. According to a target mode type, corresponding potential well conditions are selected to determine initial geometrical and angular parameters, and the eigen equation is iteratively solved, and finally, the echo wall modes that can be excited are obtained. The application realizes a streamlined design, does not depend on artificial experience, can effectively exclude pseudo modes, directionally excite high-order modes, and has small calculation amount and high design efficiency.

The application relates to the technical field of magnetic field sensors, and particularly relates to an echo wall microcavity high-sensitivity magnetic field sensor based on magnetic force modulation frequency locking, which comprises a laser, an isolator, a polarization controller, an attenuator, a sensitive unit, a photoelectric detector, a lock-in amplifier, an oscilloscope, an upper computer, a frequency locking module and a Helmholtz coil. The sensitive unit comprises a tapered optical fiber, an echo wall microcavity and a magnet. The frequency locking module comprises an RF signal source, a mixer, a low-pass filter and a PID controller. The outgoing end of the laser is sequentially connected with the leading end of the tapered optical fiber through the isolator, the polarization controller and the attenuator. The echo wall microcavity is coupled with the tapered region of the tapered optical fiber. The magnet is adhered to the surface of the echo wall microcavity. The trailing end of the tapered optical fiber is connected with the incident end of the photoelectric detector. The application solves the problems of low sensitivity and poor anti-interference capability of the existing magnetic field sensor, and is suitable for the fields of biomedicine, industrial detection, environmental monitoring and the like.

The invention discloses a Doppler velocity measurement system based on whispering gallery microcavity Brillouin laser, and belongs to the technical field of laser detection. The system comprises an echo wall microcavity Brillouin laser implementation unit, a light selection and amplification unit and a Doppler velocity measurement unit. Pump light is input into a high-quality factor echo wall microcavity through evanescent coupling, a cascade stimulated Brillouin scattering process is stimulated, and narrow-linewidth cascade Brillouin laser is generated; a tunable filter is used for screening out specific-order laser, and the specific-order laser is amplified by an erbium-doped optical fiber amplifier to serve as a detection light source; and after the probe light is reflected by the moving target, feedback light carrying Doppler frequency shift is re-injected into the microcavity and generates a self-mixing interference beat frequency signal with laser in the cavity, and finally the target speed is demodulated through photoelectric detection and spectral analysis. According to the invention, the microcavity enhancement effect and the cascade Brillouin process are utilized to narrow the line width, and the self-mixing interference structure is combined, so that laser Doppler velocity measurement with high resolution, high signal-to-noise ratio, compact structure and strong robustness is realized.