141 results about "Multi wavelength laser" patented technology

The invention discloses an insulator pollution intelligent identification method and system based on a multispectral laser radar, and belongs to the technical field of external insulation state monitoring and intelligent operation and maintenance of a power system, and the method comprises the steps: S1, employing a multi-wavelength laser radar which comprises at least three emission wavebands and comprises 1550 nm to scan an insulator, and selecting at least three wavebands from {355 nm, 405 nm, 532 nm, 905 nm, 1064 nm and 1550 nm}; distance gating is set according to the measuring range, and the width of a time window is 5 ns to 50 ns so as to suppress corona and background interference; through double calibration of an airborne reference sheet and a ground polarization datum plate, fitting is carried out after registration and calibration, angle response correction is carried out on a DPR, and meanwhile, the angle sensitivity of a weight is constrained in complex index solution, so that the relative fluctuation of an SGT under different visual angles is controlled within 3%, and the relative fluctuation of a DPR is controlled within 3%. Therefore, the problem of inconsistent identification results caused by attitude change and incident angle difference is solved.

Provided is a medical skin treatment device including a control unit for controlling the operation of the skin treatment device; a main body which includes a transfer unit and a power supply unit; and a handpiece which is supplied with power from the power supply unit and controlled by the control unit and one side of which is brought into contact with a patient's skin to irradiate same with laser beams. The handpiece includes at least four different laser diodes; the at least four laser diodes radiate laser beams of four different wavelengths and comprise first laser diodes, second laser diodes, third laser diodes, and fourth laser diodes; the number of the first laser diodes is 30 percentage or less of the total number of the laser diodes; and the number of the fourth laser diodes is 25 percentage or greater of the total number of the laser diodes.

The invention discloses a spaceborne multi-wavelength laser radar detection cloud particle physical property inversion method. The method comprises the following steps: solving the altitude height and the surface height of each point of an echo signal; de-noising the echo signal; correcting the pre-processed signal to obtain an attenuated backscattering signal and identifying a cloud boundary; establishing a molecular transmittance lookup table, and calculating transmittance and atmospheric molecular parameters; the back scattering coefficient of the cloud is obtained through inversion according to the attenuation back scattering signal, the transmittance lookup table, the aerosol and cloud particle transmittance and the atmospheric molecule parameters; the optical thickness, the extinction coefficient and the like of the cloud are calculated by using the attenuation backscattering signal, the cloud particle and atmospheric molecule transmittance and the atmospheric molecule parameters; calculating the depolarization ratio of the cloud; calculating an integral backscattering coefficient and an integral depolarization ratio of the cloud by using the cloud boundary information; and identifying a cloud particle phase state. The method is characterized in that cloud boundary identification is carried out on spaceborne laser radar echo signals, and cloud optical parameters are solved accurately and efficiently.

A photonic integrated circuit device includes a lasing cavity for resonating at a plurality of discrete wavelengths and an optical feedback cavity operably coupled to the lasing cavity via a front surface of the lasing cavity. The optical feedback cavity has a reflective element for reflecting light, at least partially, back into the lasing cavity to form a resonant Fabry-Perot cavity between the front surface and the reflective element. The optical feedback cavity includes a variable phase shifting element adapted for receiving an input signal to control a phase shift of light propagating in the optical feedback cavity. The amount of light entering the lasing cavity from the optical feedback cavity is low enough to avoid dynamic instability of the lasing cavity. The reduction in light is obtained using an attenuator.

The invention provides an intelligent cashmere doping content judgment system utilizing multi-mode Raman spectrum characteristics, and relates to the technical field of intelligent spectrum analysis. The cashmere doping content intelligent judgment system utilizing the multi-mode Raman spectrum characteristics comprises a data acquisition module, a multi-wavelength laser excitation unit is used for carrying out space scanning on a sample, time sequence Raman spectrums under different polarization configurations are synchronously acquired, and the time sequence Raman spectrums are analyzed; multi-dimensional original data including space coordinates, a time sequence, spectral intensity and a polarization state is formed, and an original multi-modal data set is generated. Through multi-wavelength laser space scanning and polarization time sequence synchronous acquisition, a multi-dimensional original data set containing space coordinates, a time sequence, spectral intensity and a polarization state is constructed, the dimension limitation of a traditional spectrum is broken through, and a three-dimensional convolution kernel is adopted to perform synchronous sliding processing in space and spectrum dimensions, so that the spectrum intensity and the polarization state are obtained. And the spatial distribution rule and multi-mode spectrum correlation characteristics of the doped region are directly captured.

The invention belongs to the technical field of laser protective eyeshades, particularly relates to an engineering field self-regulation laser protective eyeshade based on a sensor technology and artificial intelligence, and is used for solving the problems that an existing protective eyeshade solution cannot adapt to a dynamically changing laser environment, color distortion interferes with user vision and the environmental interference is high. According to the invention, by fusing a sensor technology and an adaptive dynamic control algorithm, the color rendition capability and the anti-interference capability of a visible light wave band are remarkably improved while millisecond-level laser threat response is realized, so that the technical bottlenecks of strong visual and environmental interference and the like of traditional protection equipment in engineering field application are solved; the device is especially suitable for complex construction scenes with high-frequency mechanical vibration and multi-wavelength laser cross operation.

The invention discloses a multi-wavelength laser collimator based on radial shearing. The multi-wavelength laser collimator comprises a near-field reference, a telescope objective combination, a bifocal objective and an image detector which are sequentially arranged along a light path. Aberration-free imaging of near-field light beams is achieved through a bifocal objective lens, and meanwhile far-field pointing is detected through coaxial shearing interference generated by means of amplitude light splitting. A single non-mobile sampling detection light path and a single detection sensor are used to realize simultaneous acquisition of near-field position information and far-field pointing information of a laser beam; the light spot position deviation and the fringe translation amount are analyzed through a computer, and high-precision collimation is achieved through a feedback control system. And the detection of the angle direction of the laser beams with various wavelengths can be realized by using a radial shearing interference technology. The device breaks through the limitation of traditional double-optical-path collimation, has the characteristics of simple structure, strong anti-interference performance, multi-wavelength applicability and the like, remarkably improves the collimation precision, reduces the cost, and has important application value in the field of laser precision collimation.

The invention provides a method and a system for wirelessly monitoring blockage of a filter screen of a dust remover. The method comprises the following steps: irradiating the surface of a filter screen by multi-wavelength laser to collect optical scattering data of particle accumulation, and extracting scattering angle distribution and intensity change characteristics under different wavelengths; collaborative analysis is carried out on a structured sequential sequence of particle accumulation distribution formed by multi-source scattering, a dynamic correlation mode is captured through scattering mode correlation processing, and an abnormal spectrogram fused with multi-wavelength collaboration is constructed; and mapping the data to a filter screen three-dimensional space coordinate to generate particle stacking density three-dimensional distribution data, generating a blockage position and severity level monitoring result according to a density over-threshold value, and pushing the blockage position and severity level monitoring result to a mobile terminal for display. According to the invention, three-dimensional space positioning and real-time grading alarm of the blockage degree of the filter screen are realized, and the maintenance accuracy of the purifier and the user response timeliness are improved.

The invention provides a method for intelligently adjusting laser power of a flow cytometer, which belongs to the technical field of flow cytometers, and comprises the following steps of: establishing a power coupling matrix, and establishing a double-layer game optimization model containing upper-layer laser power stability error minimization and lower-layer laser power interference minimization; a laser power decoupling prediction model based on a Transform architecture is applied to predict and optimize power coupling influence quantity, temperature coefficient parameters are dynamically adjusted to adapt to temperature changes of different lasers, power adjustment increments of the lasers are calculated, and double-layer optimization results are subjected to weighted fusion to obtain an optimal power adjustment strategy. The power value of each laser is adjusted according to the optimal strategy to realize multi-wavelength laser power decoupling control, and the technical problem that the detection precision of the flow cytometer is unstable due to mutual coupling interference of the power of the multi-wavelength lasers is solved.

The invention discloses a method for inverting a cloud condensation nucleus number concentration profile based on a laser radar and a neural network. The method comprises the following steps: collecting multi-wavelength laser radar data including a backscattering coefficient vertical profile, an extinction coefficient vertical profile, a laser radar ratio and a depolarization ratio; the method comprises the following steps: acquiring an atmospheric temperature profile and a water vapor mixing ratio profile which are in time-space synchronization with multi-wavelength laser radar data, performing grid alignment on a vertical height, and constructing a multi-channel input feature set for each preset target supersaturation ratio; and constructing a convolutional neural network profile inversion model, taking the multi-channel input feature set as input and the cloud condensation nucleus number concentration profile data as output, training the model, and obtaining the trained convolutional neural network profile inversion model. According to the method, the limitation of continuous, high-precision and high-temporal-spatial-resolution detection of CCN number concentration vertical distribution is overcome, and key data support is provided for the fields of weather forecast, climate models, artificial influence weather and the like.

The complex water environment multi-wavelength laser attenuation simulation system comprises a multi-wavelength laser emission module, a water body environment simulation module, a light splitting module and a power detection module. Seawater characteristics such as temperature, salinity and turbulence intensity of a water body are accurately controlled, parameters such as turbidity of the water body are changed by adding suspended particles such as diatomite and calcium carbonate, and high-precision simulation and measurement of laser attenuation characteristics in different underwater environments are realized by combining a multi-wavelength laser radar technology. According to the multi-wavelength underwater test system, through difference analysis among multiple wavelengths, environment simulation of laser detection capability and substance identification in different water body environments such as turbulent flow and quantitative influence among multi-wavelength laser can be effectively simulated; more comprehensive transmission characteristic experiment test verification and capability simulation under multi-wavelength laser are provided for underwater target identification, marine environment monitoring, resource exploration and other applications, and the multi-wavelength marine detection potential of future laser is expected to be improved.

The invention relates to a laser device, a laser control method and a charged particle beam detection system. The laser device comprises a controller, a multi-wavelength laser light source and a first dimming module. The controller is configured to match the working height of the working table and generate a wavelength selection instruction; wherein the working table is used for placing a semiconductor structure to be tested, and the working height of the working table is adjustable. The multi-wavelength laser light source is connected with the controller and is configured to respond to a wavelength selection instruction and emit a laser beam of a target wavelength. The first dimming module is located on the light emitting side of the multi-wavelength laser light source and is configured to adjust the transmission light path of the laser beam so that the laser beam can irradiate the semiconductor structure to be measured according to a first target angle. Wherein the laser beams with different target wavelengths correspondingly have different first target angles. The method and the device are used for assisting in charged particle detection so as to improve the comprehensiveness and the accuracy of semiconductor defect detection.

The invention discloses a dual-wavelength frequency doubling regulation and control method based on a PPLN waveguide, and relates to the technical field of nonlinear optics. The method comprises the following steps: constructing a PPLN waveguide model, and determining a fundamental frequency light mode and a frequency doubling light mode; calculating effective refractive indexes of the fundamental frequency light and the frequency doubling light at respective wavelengths; the polarization period is calculated according to the effective refractive index, any target polarization period is fixed, the target polarization period is configured to correspond to two different working wavelengths at the same time, and therefore dual-wavelength frequency doubling light with a specific wave crest interval is generated at the output end of the waveguide; the wave crest interval is regulated and controlled by selecting different polarization periods; according to the invention, dynamic control of dual-wavelength frequency multiplication output is realized by changing the size of a polarization period; the single waveguide can complete various optical function design ideas, and has certain value for research in related fields such as multi-wavelength lasers and wavelength multiplexing communication.

This invention discloses an antimony compound multi-wavelength laser material, its preparation method, and its applications. It relates to the field of semiconductor laser technology and solves the problems of existing antimony compound-based semiconductor laser materials, such as difficulty in achieving multi-wavelength laser emission through single epitaxial growth, and the complex epitaxial processes, limited interlayer interface quality, and insufficient precision in composition control of existing multi-wavelength laser materials. The antimony compound multi-wavelength laser material provided by this invention comprises, from bottom to top, a substrate, a monolayer of graphene, a buffer layer, a lower confinement layer, a lower waveguide layer, a dielectric layer, a quantum well structure, an upper waveguide layer, an upper confinement layer, and a capping layer; wherein the quantum well structure includes In… x3 Ga 1‑x3 As y3 Sb 1‑y3 And Al x4 Ga 1‑ x4 As y4 Sb 1‑y4 Laser materials can be used to fabricate mid-infrared semiconductor lasers, achieving selective epitaxial growth, multi-channel spectral acquisition, and broadband coverage through single-epitaxy and controlled photolithography patterns.

In some implementations, an optical device (e.g., a monolithic master oscillator power amplifier (MOPA) diode) may include a first facet, one or more gratings, an amplifier structure terminated with a second facet, and an oscillator array that includes multiple singlemode oscillators coupled to the first facet and to the one or more gratings. In some implementations, the multiple singlemode oscillators may be configured to generate multiple seed beams and to transmit the multiple seed beams into the amplifier structure through the one or more gratings.

Example embodiments provide a control device and a biomedical illumination device enabling multiwavelength laser line generation with automated beam alignment. The control device may be configured to determine, based on monitored output beam pattern of the biomedical illumination device for illumination of a microscopic sample, a position of one or more beams of the output beam pattern in relation to a target position of the one or more beams within the output beam pattern; determine instructions for one or more actuator-controlled optics of the biomedical illumination device configured for beam steering to change a deflection angle of the actuator-controlled optics based on a difference between the determined position of the one or more beams of the output beam pattern and the target position of the one or more beams within the output beam pattern; and transmit the instructions to the one or more actuator-controlled optics.

The invention relates to the technical field of lasers, in particular to a multi-wavelength coaxial line polarization homogenization laser system which comprises a laser light source, a collimation module, a coaxial beam combination module and a homogenization module. The laser light source is used for outputting a plurality of linearly polarized lasers; the collimation module is used for matching the laser spot to collimated laser with a target size; the coaxial beam combining module is used for integrating the multi-wavelength laser to the same light path and enabling the coaxiality to be smaller than or equal to 0.01 mrad; the homogenizing module comprises an aspheric lens, an aspheric mirror, a concave-convex lens and a biconvex lens, the aspheric lens is used for expanding the light beams, and the aspheric mirror, the concave-convex lens and the biconvex lens are used for converting the Gaussian light beams into uniform flat-topped light beams, so that the homogenizing module eliminates multi-wavelength dispersion and outputs coaxial laser beams with the light intensity uniformity larger than or equal to 90%. According to the multi-wavelength coaxial line polarization homogenization laser system, the multi-wavelength coaxiality and the light intensity uniformity can be improved, and meanwhile, the complexity of the laser system is reduced.

This application discloses a wavelength division multiplexing (WDM) system, device, WDM communication method, and medium, belonging to the field of wireless communication technology. A multi-wavelength laser is used to generate input light of different wavelengths; a WDM multiplexer is used to combine and modulate the input light to obtain channels with different wavelength intervals; a demultiplexer is used to demultiplex the narrow wavelength interval channels of the WDM multiplexer to increase the number of channels in the system. This application provides a blue-green WDM optical communication system and implementation method based on a demultiplexer, using blue-green light WDM technology to improve system capacity and achieve a high-bandwidth and moderate-attenuation wireless optical communication system. WDM visible light communication is achieved through a multiplexer / demultiplexer with fine wavelength intervals for visible light.

The application discloses a kind of self-adapting segmented gain multi-wavelength laser ranging method and system, method includes: multi-wavelength laser is under the control of trigger signal, laser pulse is emitted by emission optical system, trigger mode has synchronization, equal interval and coded emission.Laser echo is guided to detector by receiving system, and digital signal is generated after conversion by segmented gain module.Control processing module includes the information of ranging value, echo intensity in signal processing calculation.By self-adapting segmented gain, low magnification gain circuit is used to suppress strong signal in short distance, high magnification gain circuit is switched to improve weak signal detection ability in long distance, and step gain is formed by gain partition, and segmented area is adaptively adjusted to avoid distortion according to echo ranging value.Control processing module will complete data transmission.Near distance signal distortion and long distance signal missing detection are avoided, and system reliability and detection ability are improved.

The present invention relates to the field of semiconductor laser technology, specifically providing a tunable narrow-linewidth multi-wavelength laser based on injection locking. The laser comprises a light source, a beam splitter, a coupler, a photoacoustic frequency shifter, and a microring. The optical signal output by the light source is split into multiple sub-beams by the beam splitter. A photoacoustic frequency shifter and a microring are provided in the optical path of each sub-beam. The photoacoustic frequency shifter adjusts the frequency of the sub-beam, while the microring forms an injection-locked relationship with the light source, compressing the linewidth of the sub-beams. The sub-beams are then combined by a coupler, and finally a semiconductor optical amplifier is used for power amplification. By using the beam splitter, photoacoustic frequency shifter, and microring, the present invention enables a single light source system to output equally spaced multi-wavelength lasers, overcoming the drawbacks of traditional multi-light source designs.

The present invention belongs to the field of optical secure communication technology and discloses a plug-and-play time-phase coded quantum key distribution network. The central node includes a multi-wavelength laser, three beam splitters, a wavelength division multiplexer, and two single-photon detection units. Each user node includes an adjustable attenuator and a reflective intensity modulation module. The reflective intensity modulation module is used to modulate the intensity of two sub-pulses arriving at the user node through beam splitting-reflection-interference, thereby randomly generating two time-coded states in the Z basis and one phase-coded state in the X basis, as well as corresponding decoy states, while simultaneously rotating the polarization states of the two sub-pulses by 90 degrees. Compared with the prior art, the present invention adopts a round-trip architecture. Each user node uses the reflective intensity modulation module to implement three-state time-phase coding. This not only enables automatic polarization and phase compensation, but also enables polarization-independent quantum state preparation and decoy state preparation.

The instrument for processing microscopic particles may include a combination of modules integrated into a functional system. The system may be composed of synchronized subsystems including pneumatic modules, fluorometers, multi-wavelength lasers, dual view microscopy, high-voltage generators and other subsystems designed to analyze and control microfluidic processes occurring on a chip. The system performs the combined functions of microfluidic particle generation, analysis, and selection, making it possible for the user to create custom integrated workflows for molecular and cell biology processing. Creating the integrated platform requires an innovative and multi-disciplinary approach for module mechanical integration, electronic synchronization and user interface design for controlling diverse microfluidic processes at high speed.

The invention provides a multi-wavelength laser therapy apparatus based on dual wavelengths and four laser modes and an optimization method of the multi-wavelength laser therapy apparatus, and relates to the technical field of laser therapy. Self-adaptive optimal matching of thulium-doped ion concentration and optical fiber length in four laser modes is realized, the machine adjusting time is shortened from several hours to several minutes, and a second-level one-key switching mode in an operation process is supported; the high-peak thulium-doped fiber laser pulse output is realized at the same time, the pulse width at a smaller microsecond level is realized, the peak value and the pulse width of the output pulse are closer to those of the existing solid holmium laser, the lithotripsy efficiency is improved, particularly, the effect on soft and hard stones is realized, the whole machine conversion efficiency is improved, the operation stability is improved, and the safe and reliable treatment purpose is achieved.

The application belongs to the technical field of laser application, and discloses a multi-wavelength laser frequency multiplication device and a multi-wavelength spatial laser modulation device. The multi-wavelength laser frequency multiplication device comprises a base A and one or more laser frequency multiplication units. Two rows of first mounting grooves are arranged on the two sides of the base A in parallel along the length direction of the base A. Each row of the first mounting grooves comprises two or more coaxially arranged clamping grooves A, and the clamping grooves A on the two rows of the first mounting grooves are symmetrically arranged. The laser frequency multiplication unit is mounted in the symmetrically arranged clamping grooves A of the two rows of the first mounting grooves. Each laser frequency multiplication unit corresponds to laser of one wavelength, and performs frequency multiplication processing on the laser of the corresponding wavelength. The multi-wavelength spatial laser modulation device comprises a fundamental frequency laser, a selective frequency multiplication mechanism provided with the multi-wavelength laser frequency multiplication device, and a laser shaping and amplifying mechanism. The application has the characteristics of simple structure and strong expansibility, and is suitable for use in a spatial laser application system to synchronously modulate the multi-wavelength laser frequency, waveform and power.

The present application relates to a kind of background guided schlieren temperature field reconstruction method and device combined with laser absorption spectrum, the method includes the following steps: step one, build the measuring device of background guided schlieren tomography, complete laser collimator alignment;Step two, kHz sawtooth wave signal is generated using function signal generator, the output wavelength range of tuning laser is scanned repeatedly the absorption spectral line of each gas component in flame;Step three, using multi-camera acquisition a group of schlieren image when temperature and density are uniformly distributed in the measurement region, and the schlieren image of the measurement region is synchronously collected when the temperature and density to be measured are non-uniformly distributed;Step four, move background pattern board through time-sharing mechanism;Step five, acquisition multi-wavelength laser scanning signal;Step six, according to laser intensity, Voigt line type fitting is carried out;Step seven, inversion operation is carried out, and the three-dimensional temperature field of measurement region is obtained.The method can obtain higher resolution three-dimensional temperature field distribution.

The invention discloses a contour parameter detection system and process for a silicon single crystal crude wafer, and the system comprises a holographic projection scanning module which generates a composite light beam by adopting a multi-wavelength laser beam combination technology, and relates to the technical field of semiconductor material detection. According to the contour parameter detection system and process of the silicon single crystal coarse wafer, all-directional and multi-angle scanning of the silicon single crystal coarse wafer can be realized through the holographic projection scanning module, the whole surface and subsurface area are covered, and the problem of limited detection range in the prior art is effectively solved; the conditions of missing detection of a key area and incomplete coverage of a core area are avoided, and meanwhile, the quantum sensing detection module has extremely high detection sensitivity based on quantum entanglement and quantum interference principles, and can sense tiny magnetic field, electric field and stress changes on the surface and in the silicon single crystal crude wafer, so that microdefects are accurately detected, and the detection accuracy is improved. The problem of insufficient microdefect detection sensitivity in the prior art is solved.

A laser light generator is configured to generate one or more wavelengths of continuous wave laser light. The laser light generator is configured to collectively and simultaneously transmit each of the wavelengths of continuous wave laser light through an optical output of the laser light generator as a laser light supply. An optical fiber is connected to receive the laser light supply from the optical output of the laser light generator. An optical distribution network has an optical input connected to receive the laser light supply from the optical fiber. The optical distribution network is configured to transmit the laser light supply to each of one or more optical transceivers and / or optical sensors. The laser light generator is physically separate from each of the one or more optical transceivers and / or optical sensors.

A multi-wavelength laser includes an active layer and a diffraction grating layer that includes a front diffraction grating region, a rear diffraction grating region, and a phase shift region between the front diffraction grating region and the rear diffraction grating region. The front diffraction grating region includes one or more grating regions. Each of the one or more grating regions includes a series of unit structures that are different from each other. The rear diffraction grating region has the same structure as a structure of the front diffraction grating region.

The present disclosure is directed toward architectures that combine DWDM and CWDM concepts in a single PIC. Transmitter stages in accordance with the present disclosure include a plurality of multiwavelength lasers having regions of separately grown epitaxial material whose gain peaks are centered at different wavelengths. Each laser launches a wavelength comb comprising a plurality of wavelength signals into a PLC, where the wavelengths within each wavelength comb are separated by a wavelength spacing that is smaller than that between adjacent wavelength combs. In some embodiments, the PLC includes modulator banks for encoding data on the wavelength signals and combining them to produce a composite DWDM output signal. In some embodiments, a receiver stage is included for demultiplexing a composite DWDM input signal and detecting each wavelength channel within it. In some embodiments, the receiver stage employs polarization-diversity techniques to enable it to operate on unpolarized / randomly polarized input signals.

The utility model relates to the technical field of laser radars, in particular to an optical lens adjusting device of a multi-wavelength laser radar, which comprises a first reflecting assembly, a second reflecting assembly, a light condensing assembly and a signal transceiving assembly, the light condensation assembly is fixedly arranged in the signal receiving and transmitting assembly, the second reflection assembly is nested above the signal receiving and transmitting assembly, and the first reflection assembly is nested above the second reflection assembly; a first receiving cylinder and a first rotating unit are arranged in the first reflecting assembly, a second receiving cylinder and a second rotating unit are arranged in the second reflecting assembly, a first reflecting mirror is arranged in the first receiving cylinder, and a first optical filter is arranged in the second receiving cylinder. The first reflection assembly and the second reflection assembly form double receiving and transmitting ports, the first rotation unit is arranged in the first reflection assembly, and the second rotation unit is arranged in the second reflection assembly, so that multi-angle detection of the laser radar in a complex environment is facilitated, and the detection range and the detection efficiency are effectively improved.