366 results about "Gain" patented technology

The invention discloses an industrial part surface defect intelligent detection system and method, and relates to the technical field of defect detection. When a part is fixed on a rotating carrier for full-angle scanning, a surrounding type industrial camera and a light source array cooperate, a light field is dynamically evaluated by combining part curved surface reflection characteristics, and the light source intensity and direction and camera exposure and gain are adjusted; obtaining a uniform initial image; a global image of the part is reconstructed through brightness standardization, denoising interference suppression, multi-scale texture enhancement, distortion correction, normal expansion and cross-view alignment splicing; the method comprises the following steps: extracting cross-scale features by adopting a graph convolution attention model, constructing a fusion feature vector based on geometric morphology parameters and texture features by virtue of defect regions segmented by regional reconstruction aggregation curved surface reflection to finish classification and grading, generating a simulated graph through an adversarial generative network, comparing and verifying, and outputting a detection report. The defect detection precision and efficiency are effectively improved, and the industrial high-quality detection requirement is met.

This application discloses a focusing system, semiconductor device, and focusing control method, relating to the field of semiconductor detection technology. The magnification of the first imaging module is less than that of the second imaging module, and the first defocus amount of the object under test determined based on the first optical signal from the first detection module is greater than the second defocus amount of the object under test determined based on the second optical signal from the second detection module. Therefore, wide-range coarse focusing is achieved based on the first branch, and high-precision fine focusing is achieved based on the second branch, satisfying various focusing accuracy requirements. That is, different focusing accuracy modes share some optical elements, simplifying the system structure; moreover, based on the first optical signal received by the first detection module, the reflectivity of the object under test at a first position is determined, and the gain of the second detection module and / or the output power of the illumination module are adjusted in real time according to the reflectivity, ensuring that the photodetector in the second imaging module always operates in a high signal-to-noise ratio state, improving focusing accuracy.

This invention relates to the field of semiconductor lasers, and more particularly to a multi-chip ring array vertical cavity surface-emitting laser (VCSEL), comprising: a gain chip array, a beam-splitting axial conical lens group, a beam-combining axial conical lens group, and an output coupling mirror arranged coaxially. The gain chip array includes N (N>1) VECSEL gain chips arranged in M ​​concentric rings (M>1). The beam-splitting axial conical lens group includes M beam-splitting axial conical lenses. The beam-combining axial conical lens group includes M beam-combining axial conical lenses. The N laser beams first pass through the beam-splitting axial conical lens group to generate M-order Bessel beams, and then pass through the beam-combining axial conical lens group to combine into a resonant beam. This resonant beam resonates within the coaxial resonant cavity formed by the output coupling mirror and the gain chip array, resulting in the output laser beam. This invention employs a modular cascaded structure of axial conical lenses, realizing the parallel superposition of multiple rings of chips, fully utilizing the radial spatial dimension, and improving chip integration density.

The present application relates to a gain compensation method and module and a target voltage determination method. The gain compensation method includes: acquiring angle data of the photomultiplier tube of the detector; the angle data being used for representing a relative angle between the photomultiplier tube and an environmental magnetic field; and outputting a voltage compensation signal to an adjustable power supply circuit according to the angle data; the voltage compensation signal is used for instructing the adjustable power supply circuit to adjust a supply voltage output to each photomultiplier tube, so as to cause an output amplitude of the photomultiplier tube to reach an expected output amplitude.

This invention belongs to the field of communication technology and discloses a voice communication system based on deep ultraviolet light. The system includes: a voice communication terminal, a transmitting information processing module, an electro-optical conversion module, a transmitting optical system, a receiving optical system, a photoelectric conversion module, and a receiving information processing module. Compared with traditional radio frequency communication, ultraviolet light has excellent anti-interference and anti-interception capabilities; compared with point-to-point communication in the deep infrared band, ultraviolet light has non-line-of-sight characteristics, enabling communication even in jungle warfare. This invention uniquely employs FMCW (Frequency Modulated Continuous Wave) modulation. FMCW encodes bit information as a continuous increase or decrease in frequency. The receiving end obtains the difference frequency signal through mixing, which can be demodulated using matched filtering or Fourier transform, significantly improving processing gain and noise immunity. Even under weak scattered light conditions, signals can be reliably extracted from strong backgrounds, greatly improving communication link margin.

The application provides a Brillouin frequency shift extraction method, an optical fiber sensing system, equipment and a medium, wherein the Brillouin frequency shift extraction method comprises: acquiring an original Brillouin gain spectrum; performing an iteration process until a preset iteration termination condition is met, and acquiring a Brillouin frequency shift based on a first fitting frequency shift acquired in the last iteration process; the iteration process comprises: performing enhancement processing on a main Lorentz component in the first Brillouin gain spectrum to acquire a second Brillouin gain spectrum; wherein in the first iteration process, the first Brillouin gain spectrum is the original Brillouin gain spectrum; fitting the relationship between the Brillouin frequency shift and the Brillouin gain based on a first fitting window of the second Brillouin gain spectrum to acquire a fitting result; acquiring the first fitting frequency shift based on the fitting result; and determining the second Brillouin gain spectrum as a new first Brillouin gain spectrum. The above scheme performs enhancement processing on the main Lorentz component, so that the main Lorentz component is easier to capture, and is conducive to improving the calculation accuracy of the Brillouin frequency shift.

The optical amplifier comprises an amplification chamber, a first pump, a first heat exchanger, a second pump, and a novel catalyst module. The amplification chamber is configured to receive a laser beam and output an amplified laser beam. The first pump is configured to pump a gain medium into the gain medium system. The second pump is configured to pump a cooling fluid into the first heat exchanger. The first heat exchanger is positioned to transfer heat from the gain medium to the cooling fluid after the gain medium has passed through the amplification chamber. The novel catalyst module comprises a body and a catalyst disposed within the body. The body constitutes part of the gain medium system and is located downstream of the amplification chamber and upstream of the first heat exchanger. During use, the gain medium is adjacent to or in contact with the catalyst.

The application belongs to the technical field of inertial confinement fusion measurement, and relates to a traveling wave split-frame camera time characteristic calibration method, device, equipment and medium, which comprises the following steps: splitting a pulse laser into a first light beam and a second light beam; acquiring a first light spot image of a microstrip under a direct current voltage, and a second light spot image corresponding to the second light beam when a split-frame camera is driven by a gating pulse and is synchronized with the pulse laser; based on the first light spot image, the gray scale distribution of a strip-shaped light spot in the second light spot image is respectively subjected to spatial light intensity correction; according to the gray scale peak position of the strip-shaped light spot in the corrected second light spot image, the transmission speed of the gating pulse on the microstrip is calculated, and a gain attenuation curve of the split-frame camera is fitted; the gray scale distribution of the strip-shaped light spot in the second light spot image is subjected to gain attenuation correction by using the gain attenuation curve, and the exposure time of the split-frame camera is calculated in combination with the transmission speed and the pixel size. The purpose is to improve the calibration precision and efficiency of the time characteristics of the split-frame camera.

The application relates to the technical field of semiconductor laser control, and discloses a wavelength stabilization control method of a semiconductor laser, which comprises the following steps: constructing an equivalent heat transfer model of a multi-section semiconductor laser; monitoring the radio frequency data stream duty cycle of a gain section, switching the injection path of a low-frequency pilot signal to extract a global equivalent low-frequency thermal resistance, updating a time-varying low-frequency physical RC node parameter set; combining the transient heat power of the gain section and the equivalent heat transfer model to deduce full-frequency section junction temperature observation data, and decomposing the full-frequency section junction temperature observation data into an extremely low-frequency direct current component, a medium-low-frequency fluctuation component and an extremely transient high-frequency fluctuation component; driving a thermoelectric refrigeration component according to the extremely low-frequency direct current component; generating a medium-low-frequency feedback compensation current according to the medium-low-frequency fluctuation component, combining the extremely transient high-frequency fluctuation component to generate a feedforward compensation current; and injecting the medium-low-frequency feedback compensation current and the feedforward compensation current into a grating section after being combined. The application realizes multi-frequency section decoupling control and improves wavelength stability.

This invention discloses a 2.3 μm fiber laser based on 980 nm laser pumping, relating to the field of mid-infrared fiber laser technology. This fiber laser utilizes fluorotellurate glass fiber co-doped with thulium and erbium ions as the gain medium. It absorbs the 980 nm pump light energy by introducing erbium ion doping, and then achieves Tm through the energy transfer process between erbium and thulium ions. 3+ of 3 H4- 3 The population inversion of the H5 energy level ultimately yields laser output in the 2.3 μm band. This invention utilizes a high-power 980 nm laser as the pump source and a thulium-erbium co-doped fluorotellurate glass fiber prepared by the rod-tube method as the gain medium. By writing fiber gratings with appropriate reflectivity at both ends of the fiber, a resonant cavity with a reflection wavelength of 2.3 μm is constructed, enabling the development of a high-power 2.3 μm laser that can operate stably for a long time.

The utility model provides a kind of photoelectric sensor particle detection device and equipment based on double channel detection, it is related to optical particle detection technical field.The device sensor sampling circuit output end is connected with sampling signal distribution circuit input end;Sampling signal distribution circuit first output end is connected with first signal gain circuit input end, and second output end is connected with second signal gain circuit input end;First signal gain circuit output end is connected with first analog-digital conversion circuit input end;Second signal gain circuit output end is connected with second analog-digital conversion circuit input end;The gain coefficient of first signal gain circuit is greater than second signal gain circuit;The output end of first analog-digital conversion circuit and second analog-digital conversion circuit is connected with digital signal processing circuit.The utility model can make signal pass through different gain amplifier, double ADC sampling, make one way channel satisfy small particle measurement, another way satisfies large particle measurement, and the electrical signal of larger particle and smaller particle can be considered.

The present invention relates to a device for measuring the damage limit of a laser amplification medium and a method for measuring the damage limit. A device for measuring the damage limit of a laser amplification medium according to one embodiment of the present invention may include: an ultrashort pulse generator that generates laser light having an ultrashort pulse; an amplification unit that irradiates the laser light onto a laser amplification medium to amplify the output of the laser light; and a beam measurement unit that generates a beam profile of the laser light output from the amplification unit and measures a damage threshold of the laser amplification medium by utilizing a change in the beam profile according to a Kerr lens phenomenon.

The embodiment of the present application discloses an optical system gain calibration method and device, wherein the method obtains the low-angle value corresponding to the target particle corresponding to the pulse signal with the front peak width in the first preset range, the rear peak width in the second preset range and the full peak width in the third preset range, obtains the target low-angle histogram, can remove the influence of blood shadow first, can guarantee the accuracy and stability of subsequent gain calculation, secondly, the low-angle histogram is obtained according to the middle-angle histogram, can avoid that all particle groups cannot be recognized, furthermore, since the low-angle scattered light can reflect the size of the cell, the middle-angle scattered light can reflect the internal fine structure and particulate matter of the cell, the histogram is generated by combining the low-angle value, the middle-angle value and the high-angle value of the particle, the property characteristics of the measured substance can be more comprehensively reflected, and the accuracy of the determination of the optical system gain is improved.

This invention discloses a centrally located SESAM (Self-Sensitive Electron Oscillator) mode-locked fiber optic oscillator, relating to the field of laser technology. A single-mode pump source is connected to a mixing module via optical fiber; the mixing module is connected to a chirped fiber grating via optical fiber; the chirped fiber grating is connected to a gain fiber via optical fiber; the gain fiber is connected to a SESAM double-pigment package via optical fiber; and the SESAM double-pigment package is connected to a high-reflectivity mirror via optical fiber. Through this centrally located SESAM structure, light passes through the device twice within a single cavity cycle, effectively increasing the modulation depth. Dual modulation suppresses noise and parasitic oscillations, achieving improved mode-locking self-starting and pulse output performance.

This invention discloses a wavelength-tunable dual-cavity ultrafast fiber laser based on rotating optical fibers and its control method, relating to the field of laser technology. The dual-cavity ultrafast fiber laser of this invention integrates a wavelength division multiplexer within a dual-ring resonant cavity, structurally integrating two wavelength channels, each containing an independent gain fiber, to achieve dual-color soliton output and reduce gain competition. By setting an adjustable rotating fiber filter, consisting of a polarization controller, rotating optical fibers, and a polarization-dependent isolator, in the multiplexing section, the center wavelength of both wavelengths is tunable. Simultaneously, the two sub-cavities share the same saturable absorber to achieve passive synchronous mode-locking, and a delay line is introduced into one of the channels to adjust the equivalent cavity length, achieving repetition frequency matching and timing alignment between the two sub-cavities, thereby obtaining stable, tunable, and synchronous dual-wavelength ultrashort pulse output.

A spectrometric device according to an aspect of the present application includes: a light splitting section (2) including a diffraction grating; a detection section (2) that detects light wavelength-dispersed by the diffraction grating; a rotation section that rotates the diffraction grating; a light blocking section that blocks measured light introduced into the light splitting section; a measurement condition setting section (4, 5) that sets a plurality of measurement conditions including a wavelength of a measurement target and at least one parameter value among an integration time, a gain, or a number of data accumulations; and a control section (4) that acquires a dark field measurement value for each of the plurality of measurement conditions set by the measurement condition setting section, blocks the measured light using the light blocking section, and performs a dark field measurement at other parameter values included in each measurement condition after rotating the diffraction grating to a position corresponding to the measurement target wavelength included in the measurement condition using the rotation section. Thus, a dark field measurement value can be accurately obtained.

A pulsed laser device including: a III-V-on-silicon type hybrid pulsed laser source, including a gain section and a saturable absorber section which rest on a photonic substrate, and a longitudinal waveguide located in the photonic substrate; a control optical device including an optical pulse emitter source and a lateral waveguide located in the photonic substrate; the waveguides being sized so that the confinement factor Γlae / SA, Γlai / G in the quantum wells of the corresponding section of the optical mode of the lateral waveguide is higher than the confinement factor IL / ms, in the quantum wells of the semiconductor medium, of the optical mode of the longitudinal waveguide.

This invention relates to the fields of optical fiber communication and microwave photonics. Existing tunable dual-passband microwave photonic filters suffer from poor passband stability and cannot meet practical application requirements. This invention provides a narrow-band tunable dual-passband microwave photonic filter using a Brillouin fiber laser. It generates dual-tone pump light to excite the Brillouin using a tunable laser source and an intensity modulator. Combined with a Brillouin fiber oscillator and a cascaded Fabry-Perot cavity, the Brillouin gain spectrum is narrowed to the kHz level. Simultaneously, the different periodic resonant frequencies of the two ring cavities effectively suppress side modes, filtering out the desired frequency band signal. Furthermore, by synchronously tuning the center frequencies of the two passbands of the filter by changing the pump light wavelength, and simultaneously controlling the output frequency of the signal generator, the frequency interval between the two passbands is changed, ultimately realizing a narrow-linewidth tunable dual-passband microwave photonic filter.

This invention discloses a microcrystalline composite glass fiber with zero thermal quenching of yellow light and its preparation method; the cladding of the microcrystalline composite glass fiber is quartz glass, and the core is SiO2 composite Dy 3+ Doped Gd3ScGa4O 12 Microcrystalline glass. The fabrication process of this optical fiber includes: first, acid washing and drying of a quartz glass tube, followed by sealing one end with a tapered end; then, adding Gd... 3‑x ScGa4O 12 : x Dy 3+ A ceramic core rod is placed inside a quartz glass tube to form an optical fiber preform. Finally, the preform is drawn into fibers at high temperature to obtain the microcrystalline composite glass fiber with zero thermal quenching of yellow light. The microcrystalline composite glass fiber prepared by this invention can maintain stable yellow light emission under high-temperature conditions, with no thermal attenuation in intensity and no significant shift in the emission center, and can be used for Dy... 3+ Doped yellow fiber lasers provide an efficient and stable gain medium, which is conducive to the miniaturization of devices and is expected to enable direct output of high-power yellow lasers.

This invention discloses a miniaturized, ultra-wideband, dual-polarized antenna based on non-uniform planar loading, comprising a first layer, a second layer, and a third layer arranged sequentially from top to bottom. The first layer is a non-uniform planar structure composed of four types of elements, used to improve high-frequency beam splitting. The second layer is a radiator structure consisting of two pairs of orthogonally placed magnetoelectric dipoles. The third layer is a reflector cavity composed of a planar metal reflector and a vertically loaded metal plate. This invention discloses a miniaturized, ultra-wideband, dual-polarized antenna based on non-uniform planar loading. By using the non-uniform planar structure loaded at the top of the antenna radiator, the high-frequency anti-phase currents of the electric dipole arms are modulated into in-phase currents, suppressing higher-order modes and refocusing the split beam, thereby obtaining a stable, high-gain radiation pattern throughout the entire ultra-wideband frequency range.

The application relates to the field of optical technology and discloses a 2-micron infrared polarized laser physiotherapy system with stable gain, which is composed of a 2-micron pulsed laser resonant cavity of stimulated radiation, a first-stage gain ring cavity, a second-stage gain ring cavity, an optical isolator, a filter, a power monitoring detector, a polarization light splitting module, a polarization light guiding fiber and a polarized laser output head, can output various polarized lasers, has the characteristics of stable gain and adjustable light spots, and can be applied to various linear polarized laser, circular polarized laser, vector polarized laser and vortex circular polarized laser physiotherapy systems.

The application discloses an external cavity semiconductor chaotic laser, which comprises a driving source, a temperature control unit and an output assembly; the temperature control unit comprises a TEC controller, a TEC refrigerating sheet and a temperature sensor which are located inside a butterfly-shaped package; a semiconductor gain medium, a coupling lens group, an external cavity reflector and a collimating lens group are fixedly installed on the TEC refrigerating sheet in sequence along the outgoing direction of laser; the semiconductor gain medium, the coupling lens group and the external cavity reflector are coupled in sequence to form a laser resonant cavity; the electrodes of the temperature sensor and the TEC refrigerating sheet are connected with the TEC controller through the pins of the butterfly-shaped package respectively; the electrodes of the semiconductor gain medium are connected with the driving source through the pins of the butterfly-shaped package; and the output assembly is located right behind the output end of the collimating lens group. The laser of the application has the advantages of simple structure, low cost, easy operation, good environmental adaptability and stable high-quality chaotic laser output.

The invention discloses a compact arbitrary transverse mode laser. The laser comprises a pumping source, a pumping focusing optical system, a laser total reflective mirror, a laser gain medium, a laser output mirror and an astigmatism mode converter, the pumping source emits pumping light in a gain medium absorption band; the pump light is focused and then enters the gain medium; the gain medium absorbs the pump light and generates laser gain; the total reflective mirror highly reflecting laser wavelength and the output mirror partially transmitting the laser wavelength jointly form a simple linear resonant cavity. When the laser gain medium is inclined by a preset angle relative to the optical axis of the resonant cavity, meridian light and sagittal light pass through different optical paths of the gain medium to introduce astigmatism, an HG mode facing the directions of two astigmatism symmetry axes can be reproduced, and modes facing other directions cannot be reproduced due to the astigmatism effect. Therefore, when the pump light deviates from the axis of the resonant cavity in the directions of the two astigmatic symmetry axes, any high-order HG mode with mode ordinal numbers not being zero in the two directions can be excited, and any LG mode laser can be generated through astigmatic mode conversion.

The present disclosure provides a semiconductor optical device and a manufacturing method thereof. The semiconductor optical device includes a substrate including silicon and having a platform, a waveguide, and a diffraction grating in regions each different when viewed from above; and a semiconductor element bonded on the diffraction grating and the platform, the semiconductor element being in contact with an upper surface of the substrate, formed of a group III-V compound semiconductor, and having optical gain, the waveguide being optically coupled with the diffraction grating in an extension direction of the waveguide, the platform being located on both sides of the waveguide and the diffraction grating in a direction crossing the extension direction of the waveguide, the substrate having a groove between the platform and the waveguide, and the diffraction grating being continuous with the platform in the direction crossing the extension direction of the waveguide.

The embodiment of the present application discloses a kind of optical system gain calibration method and device, wherein, the method comprises: under the preset gain of optical system, the scattering light generated when the substance to be measured passes through the laser detection area of optical system and is irradiated by laser beam is obtained, low-angle histogram, middle-angle histogram and the high-angle histogram are obtained according to the scattering light, the gain calibration gain corresponding to the substance to be measured is calculated based on low-angle histogram, middle-angle histogram and high-angle histogram, whether the calibration gain is in the preset interval is judged, to determine the gain calibration of optical system. Since low-angle scattering light can reflect the size of cell, middle-angle scattering light can reflect the internal fine structure and particulate matter of cell, by combining low-angle scattering light, middle-angle scattering light, low-angle histogram, middle-angle histogram and high-angle histogram, the property characteristics of the substance to be measured can be more comprehensively reflected, so as to improve the accuracy of the determination of optical system gain.

This invention discloses a transmitting device and its packaging method for improving the performance of a C+L400G fiber amplifier, belonging to the field of optical communication and fiber amplification technology. The device includes an airtight housing, a five-channel pump laser emitting unit, a multiplexing and output unit, a bandwidth gain monitoring unit, a temperature detection unit, and a control and storage unit. The device uses four narrowband monitoring channels to constrain and sample the key gain states of the C-low / C-high / L-low / L-high subbands, and simultaneously collects temperature and the workload of the five pumps. Individualized calibration, threshold determination, and model / parameter writing are completed at the factory stage. During operation, using the monitored signals and temperature as input, a 12-subband gain prediction vector is output through the written prediction model, and the five pump currents are adaptively adjusted using closed-loop control. The packaging method includes steps such as device assembly and connection, sealing and leak detection, factory calibration modeling and writing, and online closed-loop control operation.

This invention relates to a machine learning-based modeling method for cloud wireless access networks, comprising: acquiring a remote cloud wireless access network transmitter; improving the remote cloud wireless access network transmitter by replacing the traditional microwave source with a dual-ring opto-oscillator to suppress side modes through single-mode oscillation; and introducing a directly modulated laser after an arbitrary waveform generator to utilize the chirp effect and fiber dispersion to generate power gain; and modeling the millimeter-wave signal spectrum of the improved remote cloud wireless access network transmitter based on a lightweight gradient booster model to match the dimensions of input and output features. This invention uses a dual-ring opto-oscillator to replace the traditional microwave source, reducing phase noise; utilizes the synergistic gain behavior of the directly modulated laser chirp and fiber dispersion to improve the transmission gain of the millimeter-wave signal; and models the spectral characteristics of the millimeter-wave signal using a lightweight gradient booster model to achieve spectrum prediction.

The application discloses a 750-850nm waveband photonic crystal surface emitting laser and a preparation method, and belongs to the field of semiconductor lasers. The application is divided into surface etching and buried photonic crystal layer structures, uses n-GaAs as a substrate, combines surface etching or buried photonic crystal structures, uses amorphous silicon, titanium oxide, GaP or AlGaAs as main materials of a resonant cavity, utilizes large-area in-plane resonance and high coupling with a quantum well active layer, realizes low-loss resonance and optical gain, and realizes a 750-850nm waveband semiconductor laser with high light beam quality, high power and surface emission.

[Problem] To reduce noise in the comparator. [Solution] The solid-state imaging device includes a light-receiving element, a first amplification circuit, and a second amplification circuit. The first amplification circuit amplifies and outputs the difference between a reference signal and an input signal output from the light-receiving element. The second amplification circuit includes an amplifying transistor that amplifies and outputs a first amplified signal from the first amplification circuit. Based on the analog gain of the reference signal, the second amplification circuit opens or shorts the first and second terminals of a first impedance element connected between the amplifying transistor and the positive power supply line, thereby controlling a logic threshold.