27 results about "Broadband laser" patented technology

The application discloses a kind of EFPI optical fiber sensor multi-sensor multiplexing temperature-pressure demodulation system and method, including ASE broadband laser, optical circulator, EFPI optical fiber sensor, 2-way wavelength division multiplexer, N-way wavelength division multiplexer, N-way wavelength division demultiplexer, photoelectric detector, FBG, 1*2 optical fiber coupler, optical spectrometer, data processing system;The input port input of the optical circulator is connected with ASE broadband laser, the output port cir2 is connected with two cascaded FBGs, the output port cir3 is connected with EFPI optical fiber sensor, the input port of 2-way wavelength division multiplexer is connected with the output port cir4 of optical circulator, and the output port is connected with N-way wavelength division multiplexer;N-way wavelength division multiplexer is accessed via the input port of 1*2 optical fiber coupler, and outputs two-way signals, one-way is connected with N-way wavelength division demultiplexer via N-way photoelectric detector and data processing system, and the other way is connected with optical spectrometer;N channels are connected by cascaded FBG, and the cascade of N EFPI optical fiber sensors is realized.

A compact LSP broadband light includes a gas containment structure containing a mixture of a first noble gas and a second noble gas, a filter tube positioned within the gas containment structure, an input window, and a pump source. The laser pump source directs an optical pump through the input window to sustain a plasma within the filter tube. The first noble gas absorbs broadband light within a first and a second wavelength band. The filter tube absorbs broadband light having a wavelength below a selected threshold. The absorption of broadband light by the first noble gas and the filter tube provide long-pass filtering to protect one or more downstream optical elements. The gas containment structure includes an output optical window for transmission of filtered broadband light. The gas containment structure includes a gas inlet and outlet for generating a reverse vortex flow pattern within the filter tube.

The disclosure relates to an optical system comprising a laser source (1) which generates pulsed laser radiation consisting of a temporal sequence of laser pulses in an input laser beam (EL), a splitting element (2) which follows the laser source (1) in the course of the beam and splits each of the laser pulses into laser pulse replicas separated spatially and / or temporally from one another, a combination element (4) which follows the splitting element (2) in the course of the beam and superimposes the laser pulse replicas in a respective laser pulse in an output laser beam. It is the task of the disclosure to provide an improved optical system compared to the prior art. It should be possible to generate particularly short and thus spectrally broadband laser pulses of high power with the optical system. The disclosure proposes that at least one multipass cell (3) is arranged in the beam path between the splitting element (2) and the combination element (4), through which the laser pulse replicas propagate, wherein the multipass cell (3) contains a medium in which the laser pulse replicas undergo nonlinear spectral broadening.

This invention provides a self-heterodyne detection system capable of stably and over long periods of time measuring broadband laser linewidths. [Solution] The present invention discloses a self-heterodyne detection system. The system may include a frequency comb light source that generates light, a photodetector that detects the light, an electrical spectrum analyzer connected to the photodetector that analyzes the frequency and wavelength of the light using the detection signal of the photodetector, an interferometer including an input coupler provided between the frequency comb light source and the photodetector to receive the light, a branch waveguide branched by the input coupler, and an output coupler connected to the branch waveguide, and a programmable filter provided in the branch waveguide to select the peak wavelength of the light.

A spectral domain optical coherence tomography (OCT) system utilizes an electrowetting prism having four isolated electrodes and configured to deflect a light beam according to an actuating control signal applied to the electrodes. The control signal causes the light beam to laterally scan over a sample. The light beam is produced by a broad bandwidth laser and light from the sample and a reference path is provided to a spectrometer for analysis. The light source may be an all-normal-dispersion fiber laser seeding a gain-managed nonlinear fiber amplifier. The electrowetting prism is capable of scanning up to ±6°. The system is low power and operates at kHz speed.

According to the laser wireless energy transmission device and method based on nonlinear spectrum broadening regulation and control, a laser meeting the nonlinear broadening excitation condition is adopted as a core light source, output light of the laser is coupled into a nonlinear photonic crystal fiber, and the nonlinear spectrum broadening regulation and control is achieved by precisely regulating and controlling microstructure parameters of the nonlinear photonic crystal fiber. The single-wavelength laser is converted into continuous wide-spectrum laser covering 600-1400 nm by using the synergistic nonlinear effect of the single-wavelength laser; after the wide-spectrum laser is emitted by the collimation system, the wide-spectrum laser is received by a multi-junction photovoltaic cell array of which the spectral response range is matched with the wide-spectrum laser in advance and is efficiently converted into electric energy. According to the invention, through a dynamic spectrum matching mechanism, the atmospheric transmission loss is significantly reduced, the full-spectrum response of a photovoltaic cell is fully utilized, long-distance, high-efficiency and high-stability wireless energy transmission is realized, and the system is especially suitable for application scenarios such as space energy, unmanned aerial vehicle charging and the like.

Methods and apparatuses are disclosed for true spectral flow cytometers that use wide band lasers to provide excitation light to cells, proteins, antibodies, and the like. Light from wide band lasers (emitting light through a continuous, wide bandwidth of wavelengths) is projected into a flow cell as a spread out spectrum to generate a spatially arranged spectrum that can excite a fluorescent response in cells passing through the flow cell to generate at least one excitation emission matrix (EEM) plot, wherein the EEM plot includes excitation wavelength, emission wavelength and fluorescence intensity.

The invention relates to a detonation velocity measurement system and method, in particular to a system and method for measuring the detonation velocity of an explosive through an energy-type demodulation femtosecond fiber grating, and solves the technical problem that an existing method is difficult to realize precise positioning of an explosion wave surface and long-distance detonation velocity measurement. The system comprises a broadband laser, a circulator, a sensing grating string, a photoelectric detector and a control unit, the control unit is used for controlling the broadband laser to emit an optical signal, the optical signal is transmitted to the input end of the sensing grating string through the first terminal and the second terminal of the circulator and enters the third terminal through the second terminal after being reflected by the sensing grating string, and the third terminal transmits the optical signal to the input end of the photoelectric detector; the photoelectric detector converts reflected optical signals into analog electric signals in real time and sends the analog electric signals to the control unit, and the control unit is used for processing the analog electric signals to obtain the explosive detonation velocity. According to the method, the error of the arrival time point of the explosive shock wave of the explosive can be controlled within 1%.

The invention discloses a calculation method for broadband laser frequency doubling conversion capability of gradient doped single crystals. The single crystal material with the axial gradient refractive index can realize a broadband laser high-efficiency frequency conversion process, and when a certain gradient doped single crystal has different refractive index gradient ranges, gradient sizes and single crystal thicknesses, laser wavebands and bandwidths for realizing high-efficiency frequency doubling are different. Through calculation and comparison of the three steps of the calculation method, the minimum gradient range and gradient size can be obtained, the blank of theoretical calculation of the gradient-doped single crystal in the field of broadband laser frequency conversion is filled up, the problems of refractive index parameters and gradient design of the gradient-doped single crystal are solved, and the method is suitable for industrial production. Under the same condition, the frequency doubling action distance is prolonged, the single crystal growth difficulty is reduced, the utilization rate and the frequency conversion efficiency of a single crystal material are improved, and theoretical guidance is provided for growth of gradient doped single crystals.

A tunable laser comprising at least two gain chips configured to generate light and a wavelength selection circuit. The wavelength selection circuit comprising a first waveguide coupled to a first gain chip of the at least two gain chips, a second waveguide coupled to a second gain chip of the at least two gain chips, a first wavelength selective photonic ring resonator optically coupled to the first waveguide, a second wavelength selective photonic ring resonator optically coupled to second waveguide, a third waveguide optically coupled to the first wavelength selective photonic ring resonator and the second wavelength selective photonic ring resonator; and a control circuit. The control circuit is configured to apply a first current to the first gain chip to bias the first gain chip, tune the first wavelength selective photonic ring resonator to a target wavelength, and tune the second wavelength selective ring resonator off-resonance.

An ultrasound (US) detection system is disclosed. The US system, comprising: a wideband laser source configured to emit a wideband laser beam; a wideband pulse laser generator; an array of optical resonators configured to be impinged by an acoustic wave, the array is in optical communication with the wideband pulse laser generator, such that laser pulses generated by the wideband pulse laser generator resonate in the array of optical resonators, and an array of photodetectors, each photodetector is in optical communication with at least one corresponding optical resonator and configured to detect a change in the intensity of at least one laser pulse in response to impingement by the acoustic wave.

The present application relates to the technical fields of biomass energy utilization and surface engineering protection, and discloses a kind of high-temperature corrosion resistant protective coating on the surface of biomass boiler pipeline and preparation method, the present application is aimed at the high-temperature pipeline of biomass boiler under the severe condition of high alkali metal and high chlorine, prone to high-temperature molten salt corrosion, existing protective coating is easy to peel off, insufficient corrosion resistance, short service life of core problem, design NiCoFeCrSiAlW high-entropy alloy protective coating, by accurately controlling the atomic percentage of each element, alloy powder is prepared by two-step mixing method, and a metallurgical bonded high-entropy alloy coating is formed on the surface of the pipeline substrate by wide-band laser cladding technology;The coating is a BCC single-phase solid solution structure, has excellent high-temperature oxidation resistance, molten salt and chlorine ion corrosion resistance, high bonding strength, excellent thermal shock resistance, can greatly reduce the corrosion rate of the pipeline, significantly improve the service reliability and service life of the biomass boiler pipeline.

The application discloses a kind of ultra-wideband laser radar inertial navigation cooperative SLAM method and system, it is applicable to the robot positioning and mapping task under the environment without GPS.This method fuses the high-frequency motion prior of IMU, the relative pose constraint of LiDAR and the absolute ranging information of UWB, constructs unified factor graph optimization model, realizes multi-sensor cooperative positioning;System initialization stage completes IMU bias calibration, UWB base station coordinate configuration and LiDAR initial attitude estimation;In the running process, the relative motion between key frames is obtained by using IMU pre-integration prediction pose and LiDAR point cloud registration, combined with UWB ranging to construct residual term and introduce adaptive weight mechanism to suppress ranging anomaly, improve fusion robustness;The system of the application supports geometric feature loop detection, and combined with UWB to construct cross-frame constraint for loop optimization, and the optimization result is used for real-time incremental update of global map;The method has the advantages of high positioning accuracy, strong anti-interference ability, wide application scene, etc.

The present application provides a multi-wavelength laser for synchronously monitoring the temperature and pressure of an ocean. A pulse controller is used to convert a broadband laser outputted by a broadband laser source into a broadband pulsed light, and then a phase shifted fiber bragg grating unit is used to demodulate a plurality of pulsed light with different wavelengths from the broadband pulsed light. The pulsed light outputted by the laser is emitted into a sensing fiber in seawater via a wavelength division multiplexer, scattered light is returned to a control demodulation module via the wavelength division multiplexer, the control demodulation module demodulates the scattered light, so that the dynamic pressure is parsed according to a phase change of a light signal, and the seawater temperature is parsed according to a wavelength change of the light signal.

A multispectral laser detection and ranging device including a spectral delay unit configured for delaying the broadband laser beam pulse depending on the wavelength, to give a wavelength comb selected in the spectral range, such that the broadband laser beam pulse is transformed into a pulse-train wherein each pulse in the train is at a different wavelength of the wavelength comb.

This invention discloses a broadband laser vibrometer calibration method and apparatus, belonging to the field of optoelectronic measurement technology. The apparatus includes a laser vibrometer, a first acousto-optic modulator, a second acousto-optic modulator, a concave mirror, a first sinusoidal signal source, an FM signal source, and a second sinusoidal signal source. This invention uses two acousto-optic modulators for optical frequency control and processing. One modulator is loaded with a sinusoidal wave to obtain an FM signal, and the -1st order diffraction order of the acousto-optic modulator generates an optical frequency modulation signal. The other modulator is frequency-shifted using the +1st order diffraction order, ensuring the median modulation frequency is at the laser vibrometer's output frequency. The signal is reflected and converged by the concave mirror, returning to the laser vibrometer along the original path, thus obtaining an optical frequency characteristic signal that completely simulates the actual sinusoidal waveform motion. This ensures the optical frequency modulation signal maintains its median frequency upon returning to the laser vibrometer for measurement processing, thereby achieving broadband laser vibrometer calibration and evaluation.

Laser processing head (1) for processing a workpiece (10) using a laser beam (2), comprising: a scanning device (80) for deflecting the laser beam (2) on the workpiece (10); a housing (3, 3') in which the scanning device (80) is arranged; and at least one overheating protection device (4) designed to protect the housing (3) from overheating, characterized in that the overheating protection device (4) comprises an energy distribution device for distributing incident radiant energy, and the energy distribution device comprises a convex structure (42), and / or the energy distribution device comprises a dispersion element (41) for attenuating laser pulses and / or spectrally broadband laser radiation.

The present invention discloses a self-lubricating TiN / GO composite ceramic coating, which is located on the surface of a TC4 substrate and is prepared from a mixed powder comprising 95-99 wt.% TiN and 1-5 wt.% GO. The preparation method comprises pre-treating the TiN and GO mixed powder; preparing a pre-set powder slurry from the pre-treated TiN and GO mixed powder; and cladding the pre-set powder slurry onto the pre-treated TC4 substrate surface using a broadband laser cladding process to form a TiN / GO composite ceramic coating on the TC4 substrate surface. The TiN / GO composite ceramic coating of the present invention exhibits excellent wear resistance and friction reduction properties, reducing friction losses in the wear system.

The application discloses a broadband laser pulse chirp rate measuring method and device. The method is as follows: a broadband chirp pulse is divided into two beams, a reflected beam keeps original beam characteristics as a measured light, a transmitted beam becomes narrow pulse width and narrow spectrum light as a probe light after filtering, the two beams are incident in a non-collinear way in a nonlinear crystal to generate sum frequency through space-time coupling, a crystal is optimally adjusted to obtain a maximum intensity sum frequency signal, a spectrometer is used to measure the sum frequency spectrum and record the data; a probe light path is adjusted to change a relative synchronization relationship with the measured light, so that the probe light scans from a front edge to a rear edge of the measured light, and a delay path amount and a corresponding sum frequency spectrum are recorded; and the chirp rate is calculated according to a corresponding relationship between the sum frequency spectrum and the path delay amount. The device for realizing the method comprises a beam splitter, three mirrors, a narrow-band filter, a path delay device, a nonlinear crystal, an electric angle adjusting frame, an absorber group, a lens and a spectrometer.

A laser machining device includes: a broadband light source, which generates a broadband laser beam; a first lens unit to which the broadband laser beam is incident and having a first effective focal length; a second lens unit spaced apart from the first lens unit in a first direction and having a second effective focal length; a beam splitter disposed between the first lens unit and the second lens unit, and which is movable in the first direction and a direction opposite to the first direction within the first effective focal length from the first lens unit, and splits the broadband laser beam passing through the first lens unit into a plurality of sub-laser beams; and a focusing lens spaced apart from the second lens unit in the first direction, and which focuses the sub-laser beams passing through the second lens unit on a substrate.

A spectral beam combiner (50) comprises at least one transmitting volume chirped Bragg grating, TVCBG, (24, 62) configured to diffract a first broadband beam (42, 66) propagating at one central wavelength, which satisfies the Bragg condition, and incident on the TVCBG (24, 62) at one of (+) (-) Bragg angles, transmit at least one second broadband beam (40, 68) propagating at a second central wavelength, which does not satisfy the Bragg condition, and incident on the TVCBG (24, 62) at the Bragg angle which is opposite to the one Bragg angle of the first broadband beam (42, 66), and combine the diffracted first (42, 66) and transmitted second (40, 68) broadband beams into a first single high-power collimated broadband output beam. The spectral beam combiner (50) further comprises a first thermal lens compensator, wherein a thermal lens is induced in the one TVCBG (24, 62) by one of or both first and second broadband beams (40, 42, 66, 68). The first thermal lens compensator includes a holographic achromatic broadband phase mask, HAPM, recorded in a designated PTR, photo-thermo-refractive, glass plate (35) which is located downstream from the one TVCBG (24, 62) or recorded in a PTR glass plate (35) with the one TVCBG (24, 62) and / or a pair of holographic phase masks, HPM, which are aligned at respective opposite Bragg angles upstream from the one TVCBG (24, 62), the HPMs diffracting the second broadband beam (40, 68) while converting a Gaussian intensity profile thereof to a donut-shaped intensity profile.

The invention discloses a powder feeding device for broadband laser cladding additive manufacturing. The powder feeding device comprises a powder feeding nozzle, a dismounting and mounting mechanism and an adjusting mechanism. A powder feeding groove is formed in the powder feeding nozzle, a cover plate is arranged on one side of the powder feeding groove, and a sealing gasket is fixedly arranged on the inner side of the cover plate; the disassembling and assembling mechanism comprises a connecting block fixedly connected to the cover plate and a supporting block fixedly connected to the powder feeding nozzle, an inserting rod is fixedly connected to one side of the supporting block, a through hole allowing the inserting rod to penetrate through is formed in the connecting block, and an empty groove is formed in the inserting rod; according to the powder feeding device for broadband laser cladding additive manufacturing, the adjusting mechanism is arranged on the powder feeding nozzle, after the rotating shaft drives the rack to rotate through the gear, the movable block can be tightly attached to the cover plate to move, and therefore the powder outlet amount can be adjusted according to the change of the gap between the movable block and the flow guide plate; and therefore, the powder feeding nozzle can conveniently control the powder outlet amount according to different base materials and processing requirements.

A beam combiner configured to spectrally combine multiple beams includes at least one pair of identically configured TVBGs. The TVBGs are spaced apart along a light path and aligned at respective “+” and “−” Bragg angles. The upstream TVBGs diffracts a first beam, which is incident thereon at one of the Bragg angles, so that spectral components of this beams diverge from one another defining thus a fan-shaped beam at the output of the upstream TVBG. Upon launching the diffracted first beam to the downstream TVBG at the other Bragg angle, its spectral components again are diffracted but in the direction opposite to that provided by the upstream TVBG. Thus, the dispersion effects in respective TVBGs cancel out each other. Another beam is incident on and transmitted by the downstream TVBG which combines the twice diffracted and transmitted beams into a collimated combined beam.

The invention discloses a multi-point heart rate variability measuring system and a using method thereof, and relates to the technical field of fatigue detection under strong electromagnetic environment interference. Comprising the steps that a wide-spectrum laser generates a wide-spectrum optical carrier signal, and the wide-spectrum optical carrier signal is divided into a first optical path and a second optical path; the wide-spectrum optical carrier signal of the first optical path is amplified and then transmitted to each strong electromagnetic field user environment to obtain an optical fiber sensing signal; the optical fiber sensing signals are transmitted back through the multi-direction receiving end optical antenna group, the transmitted-back optical fiber sensing signals are combined, the combined optical fiber sensing signals and original optical carrier signals are subjected to optical interference, and optical interference signals with specific labels are obtained; and converting the light interference signal with the specific label into an electric signal, and processing the electric signal to obtain a multi-point heart rate variability measurement result. According to the invention, thorough isolation between a sensitive electrical part and a strong electromagnetic environment is physically realized, and the working stability and reliability of the multi-point heart rate variability measurement system in the strong electromagnetic environment are fundamentally ensured.

The embodiment of the invention relates to an X-ray metering system with a plasma illuminator generated by a broadband laser. The plasma LPP light source generated by the laser generates high-brightness, broadband and soft x-ray illumination. The LPP light source directs a highly focused, short duration laser source to a non-metallic droplet target in a liquid or solid state. In one example, a droplet generator dispenses a series of nominally 50 micron droplets of a feed at a rate of between 50 kHz and 400 kHz. In one aspect, each excitation light pulse has a duration of less than one nanosecond. In some embodiments, the duration of each excitation light pulse is less than 0.5 nanoseconds. In some embodiments, the LPP light source includes a gas separation system that separates unconsumed feed from other gases in the plasma chamber and provides the separated feed back to the droplet generator.

The invention provides a system and method for detecting the reflectivity of the end face of a DFB laser chip, and the system comprises a light source part which employs a broadband laser as a detection light source, an optical adjustment part which sequentially comprises an optical fiber collimator, a half-wave plate, a polarization splitting prism and a quarter-wave plate, and a beam expanding lens group. The quarter-wave plate is used for converting incident light into circularly polarized light, and the circularly polarized light irradiates the end face of the DFB laser chip through the beam expanding lens group and then is converted into specific polarized light after being reflected by the DFB laser chip so that the specific polarized light can be accurately measured by the optical power meter. According to the invention, the reflectivity of the end face of the DFB laser chip can be rapidly and accurately measured.