52 results about "Cavity resonance" patented technology

The technology described herein is directed towards a metasurface arranged with unit cells for narrowband sound absorption, in which the unit cells are based on Helmholtz resonators that can have their resonant frequencies adjusted via MEMS actuators. A sound absorbing unit-cell is designed and constructed based on a general resonance frequency, and includes a neck portion and air chamber dimensioned to resonate close to the desired resonance frequency and thereby inverse phase cancel corresponding narrowband frequencies of incoming sound waves. A moveable partition in the resonators, controlled by MEMS actuators, facilitates changing of the resonators' air cavity dimensions, to adjust the resonant frequencies to cancel acoustic waves of different frequencies corresponding to noise, which can change over time. The unit cells can be distributed as part of a metasurface, which can be positioned proximate to a noise source to phase cancel the noise.

The invention relates to an air tightness detection device and method based on resonance frequency shift of a resonant cavity, belongs to the technical field of air tightness detection, and aims to solve the problems of high equipment cost, complex operation, low efficiency and difficulty in realizing multi-parameter quantitative detection in the traditional air tightness detection technology. High-purity helium with rated pressure is filled into a to-be-detected piece through a gas compressor, the to-be-detected piece is placed in a volume-adjustable detection container after pressure maintaining, and leaked helium is pumped by a vacuum pump to flow into a resonant cavity; resonance frequency deviation caused by helium concentration changes is monitored, temperature and humidity calibration data are combined, three air tightness parameters including the leakage rate (Pa.m / s), the leakage speed (mL / min) and the leakage pressure (Pa) are calculated in real time through a microcontroller, and the air tightness grade of a to-be-detected piece is output according to the air tightness detection standard. According to the device, the volume of the detection container is adaptively adjusted through the sliding rail, and the detection efficiency and adaptability can be remarkably improved by combining frequency mixing excitation and a rapid frequency calibration technology; according to the method, resonance frequency shift-helium concentration-airtightness parameters are converted, and high-precision, multi-parameter and integrated airtightness detection is realized. The invention has the advantages of fast response speed, strong anti-interference performance, low cost and the like, is suitable for fast automatic leak detection of industrial products such as sealing devices, pressure containers and the like, and provides a new scheme for trace gas detection and gas tightness grading.

The invention relates to an acoustic insulation panel (1) based on Helmholtz single-cavity resonators, designed to effectively attenuate low-frequency noise generated by industrial equipment. The panel (1) is formed by a front wall (2) and a rear wall (3), both U-shaped, enclosing a hollow space (4) that acts as a resonator cavity. The shorter sides (2', 3') of these walls are folded inwards, forming channels that function as inlets (5) to the resonator. Furthermore, an acoustic insulation system composed of several of these panels (1) is described, in which the panels are arranged so as to allow both ventilation and noise attenuation. The associated acoustic insulation method consists of facing the resonators to maximize noise absorption at specific frequencies, ensuring a laminar air flow that improves the efficiency of the system without the need for large volumes or additional silencers.

This application provides a long-wave infrared light absorber based on phase change materials and MIM structures, belonging to the field of integrated photonic devices. The absorber includes a reflective layer, a double dielectric layer, and a metasurface layer. The metasurface layer allows light waves to enter the double dielectric layer through diffraction. The reflective layer and the metasurface layer form two reflective surfaces, allowing the light waves to undergo multiple reflections and achieve FP-cavity resonance. When the metasurface layer is crystalline and the polarization state of the light wave is not parallel to that of the metasurface layer, both the reflective layer and the metasurface layer possess metallic properties, enabling plasmon resonance when the frequency of the incident light wave matches the collective oscillation frequency of free electrons in the metal. Both FP-cavity resonance and plasmon resonance lead to the localization and enhancement of the electromagnetic field within the double dielectric layer, thereby enhancing the absorption of light waves. This application achieves reversible switching between two light wave absorption states by changing the phase state of the phase change material.

The present invention provides an on-chip photonic circuit for generation of a polarization-entangled photon-pair state by utilizing the optical nonlinearities in a novel configuration comprising dual micro-resonators, with nearly degenerate transverse-electric- and transverse-magnetic-polarized cavity resonances for the two resonators coupled in series to a common bus waveguide, wherein, the pump laser and the generated signal and idle photons can be coupled in and out the photonic circuit.

The invention discloses a high-power micro-cavity optical frequency comb generation device and method, and solves the problems that an existing optical frequency comb system needs to adopt a high-speed tunable laser to carry out precise scanning locking on micro-cavity resonance, or depends on distributed feedback type semiconductor laser with extremely narrow linewidth to carry out optical injection feedback on an ultra-high-quality micro-cavity; in order to solve the problems of complex system structure and operation due to the fact that the existing optical frequency comb has the advantages of high repetition frequency, high comb power and wide spectral range, pumping is carried out by a pumping unit, optical frequency comb generation and synchronous power amplification are carried out through an active gain microcavity, and the channel interval (100GHz) of the optical frequency comb meets the international communication standard. The power of a single comb tooth reaches a hundred mu W level and is improved by 2-3 orders of magnitude compared with a common Kerr microcavity optical frequency comb scheme (a typical value is a hundred nW level), so that weak signal power amplification is not needed, and the Kerr microcavity optical frequency comb has important application value in the field of optical communication.

The application discloses an underwater sound absorption superstructure with double-cavity resonance, which comprises a cavity, two embedded necks and a sandwich layer. The cavity is a rectangular cavity, the sandwich layer is vertically arranged in the cavity and divides the cavity into a first chamber and a second chamber which are arranged in left and right sides, and a through hole is formed in the upper surface of the first chamber and the second chamber; the two embedded necks are hollow straight pipes, respectively penetrating the through holes in the upper surfaces of the first chamber and the second chamber to enter the cavity, so that the first chamber and the second chamber are communicated with the outside. The application utilizes Helmholtz resonance sound absorption, the first chamber and the second chamber of the cavity are connected in parallel through the two embedded necks and connected in series through the holes or gaps of the sandwich layer, so that the sound absorption of the application is different from the classical Helmholtz sound absorption, and the sound absorption is characterized by the coupling of the resonance frequencies of the two single chambers, the sound absorption with a wide frequency is formed, and the wide-frequency sound absorption is realized. The deformation loss of the sandwich layer is derived from the sound absorption mechanism of the pressure difference between the two chambers, so that the superstructure is still effective at high hydrostatic pressure, and the loss effect is increased.

The application discloses a kind of hollow degree and grain fullness of pepper multi-dimensional acoustic online monitoring method and system, it is related to agricultural product quality detection technical field, method includes: by reticular conveyor belt makes the uniform speed of the pepper monomer to be measured in sound insulation shielding channel movement;Utilize air coupling ultrasonic emission probe to the pepper monomer to be measured directional emission ultrasonic wave, utilize transmission wave receiving probe to capture transmission wave after penetrating the pepper, simultaneously utilize micro sound emission sensor to capture the micro sound emission signal of the pepper;Extract the cavity resonance frequency offset of transmission wave and sound energy attenuation coefficient, carry out band energy extraction to the micro sound emission signal to calculate sound energy entropy;After multi-dimensional acoustic characteristics are standardized respectively, as multi-dimensional feature vector, input into the support vector regression model that is trained in advance, output the hollow and fullness comprehensive evaluation index of the pepper monomer to be measured.This scheme can reduce detection cost, no radiation and can accurately penetrate epidermis to obtain internal grain real state.

This invention discloses a noise reduction device and a wheel, including a housing and a control body disposed within the housing. The housing contains a chamber and an opening. The control body includes a rotating body and a rotating shaft. Specifically, the rotating shaft is coaxially connected to the end of the rotating body, which is disposed within the chamber. A baffle is provided on the outer wall of the rotating body. A resonant cavity is formed between the baffle, the outer wall of the rotating body, and the inner wall of the chamber. The resonant cavity communicates with the opening, and the size of the opening is the same as the size of the resonant cavity. Thus, the resonant cavity forms a quarter-wavelength tube. Therefore, this application converts the change in the axial length of the quarter-wavelength tube into a change in the arc length in space. While maintaining the same spatial volume, it can significantly change the length of the quarter-wavelength tube, which is beneficial for changing the noise reduction frequency of the noise reduction device.

An example apparatus, method, and system for determining a characteristic of a target gas in a fluid sample is provided. In some embodiments, the example apparatus includes a frequency comb illumination source configured to emit pulsed light having a plurality of frequency comb wavelengths. The apparatus also includes an optical cavity containing a fluid sample and exhibiting a plurality of cavity resonance modes. A frequency comb wavelength of the plurality of frequency comb wavelengths associated with the frequency comb illumination source is configured to align with a cavity resonance mode of the plurality of cavity resonance modes. A characteristic of the fluid sample is determined based on one or more optical characteristics of a transmitted light passing through the fluid sample within the optical cavity.

The invention discloses a cast-in-place concrete structure full-period maintenance system combined with cloud gateway data transmission, and relates to the technical field of building construction, the cast-in-place concrete structure full-period maintenance system comprises a three-field coupling modeling module, a cavity resonance recognition module, a spraying posture surveying and mapping module, an anti-harmonic energy regulation and control module and a self-adaptive spraying control module, in the nighttime temperature drop stage, a fluid, bubble and pipe wall three-field coupling model is constructed, a backflow wave path, bubble compression response and pipe wall elastic reflection characteristics are extracted through time domain decomposition, and dynamic baseline data are generated. Through coupling modeling and resonance recognition, spraying deviation monitoring and blind area prediction are achieved, a spraying posture closed-loop adjusting mechanism is constructed in combination with anti-resonance injection and self-adaptive control, the maintenance uniformity and reliability are improved, the crack risk is reduced, and the service life of the structure is prolonged.

The invention discloses an out-of-band wave-absorbing electromagnetic window based on transverse quasi-cavity resonance, and relates to the technical field of artificial electromagnetic materials. An impedance layer is arranged and forms a series resonance circuit, so that incident electromagnetic waves excite transverse quasi-cavity resonance on metal wires of inductance structure units, absorption of low-frequency-band electromagnetic waves (C wave band) is achieved, and the electromagnetic window has the advantages of being simple in structure, low in cost and high in efficiency. Then, incident and reflected electromagnetic waves excite a surface plasmon polariton (SSPP) mode on the metal grid bars, so that energy is located in gaps of the metal grid bars and the second dielectric substrate, and the second dielectric substrate realizes absorption of high-frequency electromagnetic waves (Ku wave band), namely, compatible synergistic absorption of low-frequency resonance absorption of the impedance layer and high-frequency SSPP mode absorption of the high-frequency wave-absorbing structure is realized; meanwhile, efficient transmission of a middle wave band (X wave band) is achieved through the frequency selection surface on the lowermost layer, and finally absorption and transmission integration of vertical resonance regulation and transverse electromagnetic coupling is achieved under a wide frequency band.

The application discloses a kind of vacuum cavity automatic air supply method, system, equipment and storage medium, belong to automation field.The air supply system of the application vacuum cavity includes vacuum cavity and air pipe, first solenoid valve and second solenoid valve are equipped on the air pipe, when the air pressure inside the vacuum cavity is less than first air pressure threshold, gas is controlled from the air pipe into the vacuum cavity by first solenoid valve, until the air pressure inside the vacuum cavity reaches the first air pressure threshold, air supply is carried out by the second electromagnetic threshold and the first solenoid valve simultaneously;When the air pressure inside the vacuum cavity reaches second air pressure threshold, the second solenoid valve is closed, air supply is continued by first solenoid valve, until the air pressure inside the vacuum cavity reaches standard atmospheric pressure, the first solenoid valve is closed, can guarantee working efficiency while avoiding adverse effects on the welding of workpiece, and can reduce cavity resonance, finally smooth opening warehouse.

The utility model relates to the technical field of injection pumps, and discloses a low-noise injection pump set which comprises a motor, a pump head is fixedly installed on one side of the motor, and an output shaft of the motor is fixedly connected with the input end of the pump head. The protection structure is arranged outside the pump head and used for reducing noise, the multiple sound absorption plates are installed on the inner wall of the cover body, interference channels are formed through the extending parts on the two sides of the sound absorption plates, the uneven interference faces are formed on the inner wall of the cover body, sound waves generated when an impeller impacts liquid can be gradually absorbed by the interference faces, and propagation and diffusion of the sound waves are restrained; the split cover body facilitates later-stage additional installation of the protection structure, meanwhile, the acoustic board and the extension part are conveniently and independently replaced after being aged and damaged, the closed structure of the cover body prevents noise from directly leaking out, gaps of the acoustic board and the interference groove absorb energy through cavity resonance and surface reflection, and the noise reduction effect is achieved. Medium-high frequency noise is absorbed through reflection and cavity resonance.

The invention discloses a baffle structure and process equipment of a semiconductor device. The baffle structure is located above the spraying plate. The baffle structure comprises a baffle body provided with a plurality of air uniformizing holes; and the turbulent flow column is arranged on the lower surface of the baffle body, and a rectifying groove is formed in the outer surface of the turbulent flow column in the axial direction of the turbulent flow column so that large vortex airflow flowing into the gap between the baffle structure and the spraying plate can be divided into small vortex airflow. According to the invention, the periodic change of the air flow vortex between the baffle plate and the spraying plate can be destroyed, and the generation of cavity resonance phenomenon can be avoided, so that the risk of unbalanced matching of process parameters of two cavities can be reduced, the yield of the process result of a single cavity is improved, and the uniformity of the process result of multiple cavities can be improved.

To provide a high frequency circuit capable of easily predicting and controlling a cavity resonance frequency in a shield case.SOLUTION: A high-frequency circuit is provided with a printed circuit board (10) on which a circuit composed of a plurality of electronic components is arranged, a shield case (31) which is electrically connected to the ground of the printed circuit board (10) and covers the circuit, and at least one spring contact (15) which is electrically connected to the ground in a space formed by the printed circuit board (10) and the inner wall of the shield case (31), wherein the shield case (31) includes a frame (41) which is surface-mounted on the ground and is electrically connected to the ground, and a cover (51) which has a ceiling surface facing the printed circuit board (10) and is in contact with and electrically connected to the frame (41). The spring contact 15 comes into contact with a part of the ceiling surface to electrically connect the ground and the cover 51.SELECTED DRAWING: Figure 2

Systems and methods for performing fault-tolerant quantum operations for cat code are provided. A quantum system includes an ancilla qubit dispersively coupled to a first logical qubit, and the quantum system can be operated at least in part by: generating a first drive waveform and applying the first drive waveform to the ancilla qubit, the first drive waveform including a first comb of pi pulses having selective frequencies corresponding to a first selected pair of even and odd cavity resonance frequencies of the first logical qubit; and reading out a state of the ancilla qubit.

The invention discloses a Fabry-Perot cavity pressure detector based on an ultra-stable laser and a detection method. The Fabry-Perot cavity pressure detector comprises the ultra-stable laser, an electro-optical modulator, a polarization beam splitter and an FP cavity sensor which are sequentially arranged in the light path propagation direction. The FP cavity sensor is configured to generate cavity length change under the external pressure of the FP cavity and reflect or transmit an optical signal containing laser frequency and cavity resonance frequency detuning amount; the optical signal is reflected by the polarization beam splitter to enter the detector; the detector converts the optical signal into an electric signal; the mixer receives the electric signal and a modulation signal of the electro-optical modulator, mixes the two paths of signals, demodulates and extracts a PDH error signal; the PDH error signal is used for resolving the detuning amount of the laser frequency and the cavity resonance frequency, and an external pressure value is obtained through calculation. According to the invention, the resolution and stability of pressure measurement can be significantly improved.

A mechanism for suppressing parasitic signals or modes in FBAR resonators and filters incorporates the effects of an electromagnetic (EM) cavity resonant physics field model. The suppression of parasitic signals is realized by modifying the characteristics of the EM cavity resonance of the FBAR resonator. This is achieved by keeping the fundamental piezoelectric resonant frequency of the resonator constant and shifting the EM cavity resonance to a lower frequency. This offset in the EM cavity resonant frequency ensures that the sub-parasitic signal resulting from the interaction between the piezoelectric resonant frequency and the EM cavity resonant frequency is offset to a lower frequency, which is advantageously located in the suppression band region outside the passband of the piezoelectric resonance. The FBAR resonator is shaped to include a "zipper" edge upper electrode that includes a series of localized ridges or peaks and valleys typically between adjacent ridges or peaks.

A kind of cavity resonance sound absorption structure performance promotion method based on lattice reflection, based on the basic principle that phononic crystal local resonance generates band gap, by increasing the lattice outer frame, change the volume ratio of the volume of lattice outer frame and cavity resonance sound absorption structure, adjust the structure geometric parameters of lattice outer frame, produce double resonance system, and then obtain the sound absorption lattice that double sound absorption peak value appears in a certain working frequency range, reach the purpose of improving the sound absorption performance of original cavity resonance sound absorption structure, the results show that, the present application can make the average sound absorption rate in the frequency range of 200-10000Hz at least increase by more than 6 times.The present application not only has obvious sound absorption performance improvement effect, and does not need to design new sound absorption structure additionally, method is simple.

To provide an electronic device capable of suppressing cavity resonance.SOLUTION: An electronic device comprises a metal housing 20, a connector 50 having a shield shell 53, and a grounding member 60. The grounding member 60 is disposed in a gap 70 between the metal housing 20 and the shield shell 53 so as to ground the shield shell 53 to the metal housing 20. The gap 70 includes: a first waveguide part 71 which comprises a top wall 23 and a side wall of the metal housing 20, and the shield shell 53; and a second waveguide part 72, continuous with a rear end of the first waveguide part 71, which comprises a rear wall 25 and the shield shell 53. The grounding member 60 is disposed in a region within a predetermined range from the rear end of the first waveguide part 71.SELECTED DRAWING: Figure 2

The invention provides a preparation method of an MMIC chip, the chip, electronic equipment and a preparation device, and relates to the technical field of semiconductors. The method comprises the following steps: preparing an MMIC functional circuit on the front surface of a wafer; according to the target thickness of the wafer, carrying out thinning operation on the back surface of the wafer; preparing a resonance suppression circuit on the back surface of the thinned wafer; scribing the wafer on which the MMIC functional circuit and the resonance suppression circuit are prepared to obtain an MMIC chip; wherein the resonance suppression frequency band of the resonance suppression circuit is matched with the natural resonance frequency band of a packaging cavity, and the packaging cavity is used for packaging the MMIC chip. Resonance generated by the packaging cavity can be effectively suppressed through the resonance suppression circuit, no extra resonance suppression material needs to be placed, on the basis of ensuring the electrical performance of the MMIC chip, the cavity resonance suppression capability and the environmental adaptability are improved, the lightweight requirement can be met, the process is simple, and the integration level is high.

The utility model provides a kind of impedance composite formula pipeline muffler, four means of physical barrier, material sound absorption, cavity resonance, airflow dredge are passed through in this design, realize the efficient control of full-band noise, it includes shell outer plate, the both ends of shell outer plate are communicated with reducing pipe, two reducing pipes are communicated with connecting pipe, two connecting pipes are communicated with butt flange, shell outer plate is sequentially provided with cylindrical sound-absorbing structure, sound-absorbing sheet structure and flow diffuser from top to bottom in it, cylindrical sound-absorbing structure is contacted with a connecting pipe, flow diffuser is communicated with another connecting pipe, the inside of shell outer plate is provided with damping layer, the inside of damping layer is provided with annular sound-absorbing cotton, the inside of annular sound-absorbing cotton is provided with metal ring, multiple perforated plates are set on the metal ring, the cylindrical sound-absorbing structure includes metal pipe, the inside of metal pipe is provided with cylindrical sound-absorbing cotton.

This invention discloses an underwater sound-absorbing composite superstructure based on a dual-resonance hybrid enhancement mechanism and its fabrication method, belonging to the field of underwater sound-absorbing structure design. This invention mixes local resonance and cavity resonance acoustic units as sound-absorbing matrices placed in a sandwich structure. The sandwich structure consists of orthogonal carbon fiber grids and buoyancy material panels, and specific viscoelastic matrix materials are configured for the two acoustic units. This invention significantly enhances sound dissipation performance by utilizing the coupling effect of the two resonance mechanisms, achieving broadband sound absorption. Furthermore, the sandwich structure effectively resists the influence of deep-water hydrostatic pressure, combining excellent sound absorption performance, load-bearing capacity, and lightweight advantages.

The invention relates to the technical field of industrial cooling tower water saving, and discloses industrial cooling tower water-saving equipment which comprises at least two resonance units, the resonance units are annularly arranged around a water distribution disc, and a gap is kept between every two adjacent resonance units which are not in contact with each other. The resonant unit comprises a resonant cavity and a mounting assembly, the resonant cavity is of an arc-shaped cavity structure, and the resonant cavity is fixed to the tower body structure through the mounting assembly. The resonant cavity comprises an outer-layer resonant ring and an inner-layer resonant ring, the inner-layer resonant ring is nested in the outer-layer resonant ring, and the outer-layer resonant ring and the inner-layer resonant ring are connected through an elastic connecting piece. And the resonant frequency of the outer-layer resonant ring and the resonant frequency of the inner-layer resonant ring are offset by a preset difference value. Through a distributed multi-frequency cooperative resonance mechanism, redundant fault tolerance is achieved in the space dimension and the frequency dimension at the same time, the technical problem that the atomization suppression effect is unstable due to periodic attenuation of the resonance amplification effect of the resonant cavity is solved, and the water saving performance of the cooling tower is improved.

The application discloses a design method of underwater sound-absorbing covering layer based on cavity resonance and local resonance coupling. The method comprises the following steps: firstly, constructing an initial configuration of sound-absorbing unit cell; then, discretizing the cavity in the initial configuration of sound-absorbing unit cell into a plurality of unit cavity layers with equal height in the axial direction, so as to obtain a discrete configuration of sound-absorbing unit cell, and constructing a prediction function; again, based on the prediction function, optimizing the discrete configuration of sound-absorbing unit cell to obtain a primary optimized configuration of sound-absorbing unit cell; then, placing a resonance body between two adjacent unit cavity layers in the primary optimized configuration of sound-absorbing unit cell, so as to form a complete configuration of sound-absorbing unit cell and construct a black box function; based on the black box function, using an optimization method to optimize the complete configuration of sound-absorbing unit cell, so as to obtain a final configuration of sound-absorbing unit cell. The underwater sound-absorbing covering layer designed by the method can simultaneously realize low-frequency sound absorption and wide-frequency sound absorption, and the average sound absorption coefficient is increased to 86%.

The utility model discloses an open type wearable earphone with a resonance structure, and relates to the field of earphones, and the earphone comprises an earphone shell which is provided with an accommodation cavity; the loudspeaker is arranged in the earphone shell and divides the accommodating cavity into a front cavity and a rear cavity; the earphone shell is provided with a sound leakage hole, and the sound leakage hole is communicated with the rear cavity. The resonance structure is arranged in the rear cavity, and the resonance structure and the sound leakage hole are arranged in a staggered manner; and the resonance structure is provided with a sealing cavity and an acoustic resistance adjusting hole, and the acoustic resistance adjusting hole is respectively communicated with the sealing cavity and the rear cavity. Compared with the prior art, sound energy limitation is not carried out on a normal sound production path, the resonance structure is arranged in the rear cavity, the main sound output path and the acoustic path of the sealing cavity are mutually independent, the normal sound production efficiency of the earphone can be fully reserved, the leakage sound is subjected to a damping effect in the transmission process through acoustic resonance, and the sound transmission efficiency is improved. Therefore, sound leakage is reduced on the premise that normal sound transmission is not interrupted and normal sound production quality is not reduced.

The invention provides a cavity antenna and electronic equipment, and relates to the technical field of antenna structures. The cavity antenna comprises a metal shell, the metal shell is provided with a cavity and a first opening which are communicated, the cavity is provided with a first cavity wall and a second cavity wall which are opposite, and the height of the first cavity wall is larger than that of the second cavity wall; the first dielectric substrate is arranged on the first opening in a covering manner; and the radiation branch knot is arranged on the first dielectric substrate, and the radiation branch knot is used for being electrically connected with the feeding point so as to excite cavity resonance and radiate electromagnetic waves. The cavity antenna has an irregular structure, can excite double modes of a feed branch mode and a cavity mode, and is wide in application range of a terminal.

The invention discloses a narrow linewidth vertical cavity surface emitting laser (VCSEL) based on Fabry-Perot cavity resonance feedback, which comprises a narrow linewidth vertical cavity surface emitting laser (VCSEL), a coupler, a circulator and an F-P cavity, and is characterized in that the output end of the VCSEL is connected with the F-P cavity through the coupler and the circulator; the main mode laser wavelength of the VCSEL is matched with the narrow-band transmission peak wavelength in the narrow-band transmission spectrum corresponding to the F-P cavity, and the side mode of the VCSEL is located in a transmission interval region between the adjacent narrow-band transmission spectrums corresponding to the F-P cavity; the coupler transmits one part of laser signals output by the VCSEL to the F-P cavity through the circulator, and the other part of the laser signals are output; the F-P cavity enables main mode laser in a laser signal to pass through and suppresses a side mode of the main mode laser to obtain narrow-linewidth laser, the narrow-linewidth laser is transmitted to the VCSEL through the circulator and the coupler in sequence, further linewidth compression is carried out in the VCSEL, and then the laser signal after linewidth compression and noise suppression is output through the coupler. According to the invention, the line width compression and noise suppression capability of the VCSEL can be remarkably improved.

An optomechanical ultrasound detector includes: a micromirror substrate; a mechanical resonator that receives ultrasound waves, oscillates at resonator frequency fr, changes cavity length Lc, and produces intra-cavity light; and an optical microcavity between the micromirror substrate and the mechanical resonator with cavity length Lc and cavity resonance frequency fc formed by the mechanical resonator and the micromirror substrate, such that the micromirror substrate produces cavity output light from the intra-cavity light, wherein the cavity output light optically encodes information about the ultrasound waves received by the mechanical resonator.