509 results about "Tunable laser" patented technology

The invention discloses a bone joint lesion area automatic labeling method and system based on image processing, and belongs to the field of bone joint lesion area labeling. According to the invention, a bone joint reflection signal is obtained by combining the polarization-state-adjustable laser light source with polarization-sensitive optical coherence tomography, and a three-dimensional birefringence distribution diagram is generated through matrix analysis. And after non-local mean filtering is carried out on the distribution map, a lesion edge contour is extracted based on a dynamic gradient amplitude, and a binary mask is generated. Mask pixels are converted into network nodes containing space coordinates, gradient directions and birefringence, and a topological network is constructed based on the Euclidean distance of adjacent pixels. The weight is calculated through the node intersection density and the birefringence, and a graph attention network is utilized to aggregate multi-layer features to extract lesion topological features. The features are mapped to a three-dimensional space to construct a lesion probability distribution field, an interactive labeling result is generated through contour surface extraction and transparency mixed rendering, and the accuracy of labeling the complex lesion area of the bone joint can be improved.

The invention provides an OFDR sensing system and method for rapidly positioning strain based on a time domain difference algorithm, and relates to the technical field of optical fiber sensing. The OFDR sensing system comprises a narrow linewidth tunable laser light source, a first optical fiber coupler, a main interferometer, an auxiliary interferometer and a data acquisition and signal processing module; laser emitted by the narrow linewidth tunable laser light source is divided into two paths through the first optical fiber coupler, one path of light enters the main interferometer, and the other path of light enters the auxiliary interferometer; the main interferometer and the auxiliary interferometer respectively output a main interferometer optical signal and an auxiliary interferometer optical signal to the data acquisition and signal processing module; the data acquisition and signal processing module is used for performing nonlinear compensation on the optical signal of the main interferometer by using the optical signal of the auxiliary interferometer, and performing cross-correlation operation on a reference optical signal of the main interferometer and a measurement optical signal of the main interferometer which are based on the strain-free state and the strain state of the sensing optical fiber and are subjected to nonlinear compensation; and obtaining the strain position and the strain value of the sensing optical fiber.

The invention relates to the technical field of gas detection, in particular to a dual-wavelength-based adaptive methane detection method and system, and the method comprises the following steps: collecting environmental interference characteristics of a to-be-detected gas environment in real time; synchronously emitting a first laser beam and a second laser beam to a to-be-detected gas environment according to the tunable laser source; receiving optical signals of the first laser beam and the second laser beam and converting the optical signals into electric signals; calculating a light intensity difference value of the first laser beam and the second laser beam based on the electric signal to generate a differential absorption signal; performing optical differential compensation on the differential absorption signal, outputting a methane concentration value, and performing environmental drift compensation on the methane concentration value based on environmental interference characteristics; and performing real-time threshold value judgment on the methane concentration value, and if the methane concentration value exceeds a preset threshold value, triggering a local early warning signal. According to the invention, the problem that the detection precision is reduced due to the fact that methane absorption signal common-mode noise and absorption coefficient drift cannot be synchronously inhibited due to dust concentration and temperature and humidity interference in a dynamic complex environment under a mine is effectively solved.

The invention discloses a method for detecting the strain of a key part of a wind turbine generator based on a temperature compensation OFDR demodulation weak fiber bragg grating array, and relates to the technical field of wind turbine generator detection, and the method comprises the steps: installing a weak fiber bragg grating sensor array at the key strain part according to the structural characteristics of the wind turbine generator, a temperature reference grating is arranged in the non-strain area or the constant-temperature area so as to monitor the temperature change in real time; a tunable laser, an optical fiber coupler and a photoelectric detector are utilized to construct an optical frequency domain reflection demodulation system, and system calibration is completed; based on an optical frequency domain reflection demodulation system, reflection spectrum signals are collected, the relation between wind turbine generator strain and temperature change is analyzed through a temperature compensation mechanism, and strain information of key parts of the wind turbine generator is obtained. According to the method, the accuracy and reliability of strain detection are effectively improved, and the problem of measurement errors caused by neglecting the influence of temperature change in a traditional method is solved.

The invention discloses an external cavity tunable laser linewidth compression system for realizing wavelength phase locking based on mutual injection of gain chips. The external cavity tunable laser linewidth compression system comprises a red light semiconductor laser main gain chip, a first collimation optical system, a blazed grating, a tuning rotating mirror, a reflector, a power supply driving system and a double-path feedback amplification system, the double-path feedback amplification system comprises a first secondary gain chip, a second secondary gain chip, a second collimation optical system, a third collimation optical system and a polarization-free beam splitter prism; and the red light semiconductor laser main gain chip, the first secondary gain chip and the second secondary gain chip are all connected with the power supply driving system. Therefore, the technical problems of low output infrared light power, poor stability and narrow mode-hopping-free tuning range in the prior art are solved, and high-power, narrow-linewidth, high-stability and large-range mode-hopping-free continuous tuning red light output can be realized.

The invention provides a tunable laser source output wavelength adjusting device and method, and the method comprises the steps: starting a tunable laser source, carrying out the preheating, and resetting a motor motion unit; acquiring an initial light-emitting wavelength based on a pre-stored relation curve between the light-emitting wavelength of the laser source and the position of the motor; controlling the output wavelength of the laser source through the coarse tuning parameter of the motor motion unit, traversing the tunable output range of the tunable laser source, and collecting the wavelength position of the reflection peak value of the fiber bragg grating and the corresponding optical power value; according to the reflection peak wavelength position, through voltage regulation and control of stacked piezoelectric ceramics, step scanning is carried out according to a target wavelength, and a laser source output wavelength is dynamically adjusted to obtain a fine scanning wavelength; and judging whether the deviation between the fine scanning wavelength and the target wavelength meets the preset precision or not, if so, locking the output wavelength, otherwise, repeatedly regulating and controlling until the conditions are met. According to the invention, traditional current-wavelength dependence is broken through, and wavelength demodulation is realized through electromechanical collaborative calibration and two-stage scanning.

The invention discloses an acousto-optic combined detection and fusion positioning method and device for underground gas leakage, and belongs to the technical field of industrial safety monitoring. In order to solve the problems of high false alarm rate, insufficient positioning precision, poor dynamic environment adaptability and the like of a single sensor in the prior art, the invention provides a multi-modal signal space-time collaborative fusion technical scheme which specifically comprises an acousto-optic heterogeneous sensor, an integrated MEMS ultrasonic array and a tunable laser spectrum module. Microsecond-level synchronous acquisition of acousto-optic signals is realized through a GPS taming clock, and a cross-correlation time delay compensation model is designed to eliminate space-time mismatch errors. And designing a three-stage dynamic fusion framework: improving LMS adaptive filtering to suppress industrial noise, establishing a light intensity attenuation model in combination with dust environment concentration, carrying out multi-modal feature extraction of acousto-optic signals, carrying out signal preliminary fusion, and judging a gas leakage condition. And constructing an acousto-optic Bayesian joint probability model, and calculating the leakage posterior probability. And optimizing positioning parameters based on a double-Kalman filter group, predicting sound wave time delay by forward filtering, and correcting a light diffusion coefficient by backward filtering to realize three-dimensional coordinate solution. Temperature, humidity and dust concentration parameters are fused in real time, a sound velocity calculation model and a light intensity attenuation factor are corrected, and the robustness of complex working conditions is improved. According to the invention, the advantages of acousto-optic signals are combined, errors of various complex environmental factors are further fused and compensated, the overall error is greatly reduced, and the method has the characteristic of dynamic adaptation, and is very suitable for gas leakage detection and positioning in complex environments such as underground environments and the like.

The invention discloses a preparation method and a structure of a photonic integrated device, and the method comprises the steps: sequentially dividing a substrate into a front modulator region, a rear modulator region, a front grating region, a gain region and a rear grating region, and growing a first active layer after manufacturing a selected region epitaxial mask pattern in the gain region, the method comprises the following steps of: growing a first active layer in a front modulator region after mask etching operation, growing a second active layer in a front modulator region after mask etching operation, growing a third active layer in a grating region after mask etching operation, finally performing grating manufacturing, and completing manufacturing of a cladding layer, an electric contact layer, an inverted table shallow ridge waveguide structure, an electric isolation trench and an electrode. According to the method, integration of multiple materials is achieved through one-time selective area epitaxial growth and one-time butt joint growth, the material growth frequency is reduced, and the manufacturing cost is saved; the gain region and the rear modulator region realize forbidden band width offset through selective region epitaxial material growth, and multi-wavelength tuning and efficient modulation are realized through fluorescence wavelength difference design of each region, so that a solution can be provided for integration of a wide-wavelength tunable laser and a double-electro-absorption modulator.

The present invention discloses a multi-wavelength tunable laser and sensing system, which relates to the field of lasers and includes: a setting module for presetting or selecting two wavelengths of laser beams in the laser; a camera module for collecting the user's target skin surface image for treatment in real time, identifying the tumor area and the healthy skin area in the image data, and identifying the current skin surface position of the laser beam. The present invention identifies the tumor area and the healthy skin area in the operation data by collecting the user's target skin surface image for treatment, further plans the laser treatment path based on the target skin surface image, and controls the laser in the process of moving according to the treatment path, in combination with the sensor to sense the tumor thickness, so as to achieve further intelligent control of the movement speed of the laser in the process of moving according to the treatment path, so that the tumor position on the user's skin surface can be treated more adaptively.

The present invention relates in one aspect to an absorption spectroscopy apparatus for measuring one or more gases in an atmosphere, wherein the apparatus comprises a wavelength-tunable laser source, a control circuit configured to provide an electrical drive current to the wavelength-tunable laser source; wherein the control circuit is configured to create the electrical drive current as a modulated drive current, wherein the modulated drive current alternates between at least a first and a second drive current, the first drive current configured to cause the wavelength-tunable laser source to emit laser radiation at a first wavelength and the second drive current configured to cause the wavelength-tunable laser source to emit laser radiation at a second wavelength, different from the first wavelength, and wherein the modulated drive current defines a sequence of pulses, each pulse having a non-rectangular pulse shape.

The invention discloses a method and device for measuring a crystal electro-optical coefficient at low voltage, and relates to the technical field of photoelectric coefficient measurement, and the method comprises the steps: employing a wavelength tunable laser as an incident light source of a crystal electro-optical coefficient detection system; before an incident light source is input into a to-be-measured laser crystal, a wave plate is added to serve as a phase compensator to generate phase delay phi 1, and meanwhile the to-be-measured laser crystal generates phase delay phi 2 under the action of direct-current voltage; when the crystal electro-optical coefficient detection system is a half-wave voltage detection system; adjusting the wavelength of the tunable laser so that 3pi / 4 is less than or equal to phi1lt; pi; when the crystal electro-optical coefficient detection system is a full-wave voltage detection system, the wavelength of the tunable laser is adjusted to enable 7pi / 4 to be smaller than or equal to phi1lt; 2pi. As the used light source is the wavelength tunable laser, phi 1 can be adjusted in a large range by changing the wavelength, so that phi 2 and the test voltage are changed, the purpose of measuring the electro-optical coefficient of the crystal at low voltage is achieved, and the test safety is improved.

The invention discloses a quasi-distributed sensing system based on a fiber type auxiliary interferometer and vernier sensitization, and relates to the technical field of optical fiber sensing. The system comprises a data acquisition module, a to-be-detected sample parameter detection device and a data processing module, the to-be-detected sample parameter detection device comprises a plurality of FPI sensors; the data acquisition module is used for acquiring optical signals corresponding to parameters of a sample to be measured and comprises a tunable laser, a main interferometer, an auxiliary interferometer, a polarization beam splitter, a balanced photoelectric detector and a data acquisition card; the main interferometer is a Mach-Zehnder interferometer, the auxiliary interferometer comprises a section of delay optical fiber with a preset length and two reflecting surfaces, and the auxiliary interferometer is arranged on a reference arm of the Mach-Zehnder interferometer; and the data processing module is used for performing first processing and second processing on the optical signal output by the data acquisition module so as to obtain the variable quantity of the to-be-detected sample parameter. According to the invention, the technical bottlenecks of complex structure, difficult debugging, low demodulation efficiency and the like in the traditional scheme are effectively overcome.

The invention relates to the technical field of optical fiber sensing, in particular to a tunable laser parameter optimization method for fiber bragg grating demodulation, which comprises the following steps of: setting scanning ranges of currents of a left Bragg reflector and a right Bragg reflector, generating a current combination sequence according to arc radius parameters, inputting the current combination into a tunable laser, collecting an output wavelength, and identifying a wavelength tuning channel and a central point thereof; and arranging the center points of the channels in sequence, and generating smooth and continuous channel center lines on the left current dimension and the right current dimension by adopting cubic spline interpolation so as to obtain a continuous and executable tuning path. According to the method, a smooth and continuous channel center line is constructed through a segmented arc scanning path and cubic spline interpolation, and an initial lookup table is formed by combining phase current fine scanning and ordered splicing, so that high-quality wavelength coverage under low sampling amount is realized, and the problems of data redundancy and channel boundary mode hopping in a traditional method are solved.

The invention relates to the technical field of laser light source measurement, and discloses a wide-range narrow-linewidth laser wavelength and linewidth measurement system, which can be flexibly matched with the center frequency of laser to be measured through the arrangement of a tunable laser, breaks through the strict limitation of the existing beat frequency method on the center frequency, effectively expands the measurement range, and improves the measurement accuracy. By combining the synergistic effect of the absorption cell and the locking loop, the system stability is improved, the measurement precision of narrow linewidth laser is guaranteed, the integration time can be flexibly adapted without tedious adjustment of a delay optical path or change of parameters of acquisition equipment through the cooperation of the optical modulator and the delay optical fiber, the problem of inconsistent measurement resolution under different integration time is avoided, and the measurement accuracy is improved. And the accuracy of short-time measurement is obviously improved. The system integrates wavelength and line width measurement functions, can measure line width, center wavelength and long-time frequency stability of to-be-measured laser, is reasonable in structural design, retains the advantage of high precision of a beat frequency method, overcomes the defects that an existing method is narrow in measurement range and inconvenient to adjust integral time, and improves the measurement accuracy of the to-be-measured laser. And the measurement requirements of wide-range and narrow-linewidth laser are met.

The invention relates to the technical field of gas monitoring, and provides a spectrum analysis-based gas leakage monitoring system, which comprises a tunable laser source, an optical curtain forming device, a scanning optical sensor, a spectrum analysis module, a three-dimensional spectrum model construction module, a leakage traceability and diffusion prediction module, an intelligent early warning module and a snapshot type multispectral imaging unit, and an open optical path and a distributed multi-node layout are adopted. According to the invention, through the steps of optical screen scanning, spectral data acquisition and processing, three-dimensional dynamic model construction, intelligent analysis leakage determination, leakage traceability visualization and adaptive learning, precise monitoring, identification, traceability and early warning of gas leakage are realized; gas identification, leakage traceability and diffusion prediction are realized based on a three-dimensional dynamic model, deep learning and fluid mechanics, the monitoring effect is optimized by adopting distributed layout and self-adaptive learning, rapid disposal is assisted by graded early warning, and the accuracy, real-time performance and safety of gas leakage monitoring are greatly improved.

A tunable laser includes: a channel selection assembly, a plurality of optical amplifiers, a micro-ring filtering assembly and a reflection assembly. The micro-ring filtering assembly is coupled to the reflection assembly, and operation wavelength ranges of the respective optical amplifiers are different. The channel selection assembly is used for selecting any optical amplifier to input a gain optical signal to the micro-ring filtering assembly. The micro-ring filtering assembly is used for filtering the gain optical signal under a vernier caliper effect to obtain filtered optical signals, and then inputting same into the reflection assembly. The reflection assembly is used for outputting some of the filtered optical signal outwards, and reflecting, after the remaining optical signals pass through the micro-ring filtering assembly, the remaining optical signals to an optical amplifier currently selected by the channel selection assembly.

According to an aspect of the present inventive concept there is provided a laser system for generating a frequency modulated continuous wave, FMCW, light signal, the system comprising: a tunable laser for generating the FMCW light signal; an optical measurement unit configured to receive a portion of the FMCW light signal, and to output, via an optical hybrid coupler, at least two angle diversity signals based on a difference between a first and second signal formed by splitting the portion of the FMCW light signal wherein the second signal is delayed relative to the first signal, wherein a pair of signals of the at least two angle diversity signals have a fixed phase shift relative to each other; and a control unit configured to: receive the at least two angle diversity signals, estimate, based on the at least two angle diversity signals, a compensation needed for adjusting a non-linearity of a frequency chirp of the tunable laser, and output a corresponding control signal to the tunable laser, wherein the control signal is configured to improve a linearity of the frequency chirp.

The invention discloses a surface topography measurement device and method based on polarization phase shift. The device comprises a laser module, a polarization beam splitting and interference module, a polarization beam combining and imaging module, a polarization image acquisition module and a control and reconstruction module. The laser module comprises a monochromatic tunable laser, an optical fiber collimating amplifier and a polarizer; the polarization beam splitting and interference module comprises a polarization beam splitting prism, a first quarter-wave plate, a plane mirror and a second quarter-wave plate; the polarization beam combining and imaging module comprises a polarization splitting prism, a third quarter-wave plate and a telecentric lens; the polarization image acquisition module comprises a micro-polarization array camera and an image processing unit, and the micro-polarization array camera synchronously acquires four polarization interference images through single exposure; and the control and reconstruction module obtains measurement data of the surface topography of the to-be-measured object through a phase unwrapping algorithm and three-dimensional topography reconstruction. According to the invention, high-precision, large-field-of-view, portable and high-efficiency field detection can be realized.

According to the dioxin closed-loop control method based on real-time detection and dynamic optimization, an online monitoring system is deployed, a tunable laser ionization time-of-flight mass spectrometer is arranged at an incineration flue gas discharge outlet to detect the concentration of trichlorobenzene serving as a dioxin indicator in real time, and a sensor is combined to detect working condition parameters; polynomial regression is used for real-time conversion of dioxin toxicity equivalent concentration, and an on-line monitoring-toxicity evaluation integrated system is formed. And a double-layer random forest-eagle mixed optimization model is constructed, the first layer is based on historical working condition data to train a random forest model to predict the dioxin emission trend and the potential standard exceeding risk, and the second layer is used for dynamically optimizing the incineration parameter combination through an improved eagle optimization algorithm and issuing the incineration parameter combination to an incineration system in real time. And meanwhile, a calcium-based retardant directional spraying device is deployed in a flue gas purification section, so that uniform covering and accurate dosage control of the retardant are realized, and the low-temperature resynthesis reaction of dioxin is inhibited. And finally, parameters of the double-layer optimization model are dynamically updated based on the error of an actual detection value and a predicted value, the adaptability of the model to working condition fluctuation is improved, therefore, dioxin emission is effectively reduced, and the environmental protection property and stability of the incineration process are improved.

The invention provides a full-automatic parameter measurement system and method for a micro-cavity optical chip, and the system achieves the automatic measurement of the characteristic parameters of the micro-cavity optical chip through integrating a DFB tunable laser light source, an isolator, an EDFA amplifier, an ASE filter, a fundamental frequency light band elimination filter, a selectable beam splitter, a VOA, a PD, a main control module and other components. The system is connected with a to-be-tested chip through a specific interface, and can automatically obtain a central wavelength change curve, a transmission spectrum characteristic afterglow map and an expected soliton state intensity range of the micro-cavity optical chip at each temperature. The invention aims to automatically test the characteristic parameters of the micro-cavity optical chip so as to assist in reducing the time generated by tuning the optical frequency comb by adopting the chip, and meanwhile, an expected soliton state intensity range is given to reduce the problem of excessive tuning, so that a pre-test process required in chip application is simplified, and great convenience is brought to debugging generation of the integrated optical frequency comb.

The invention discloses a preparation method and structure of a tunable laser, and the method comprises the steps: carrying out the surface layout of a substrate, and sequentially dividing the substrate into a front gain region, a front phase region, a common grating region, a rear phase region and a rear gain region; growing an active layer, manufacturing a butt-joint mask pattern in the gain region, etching to remove the active layer in the common grating region and the phase region, performing butt-joint growth of a passive layer, removing a mask, manufacturing a grating in the common grating region, and growing a cladding and an electric contact layer; manufacturing an inverted table shallow ridge waveguide structure, and etching an electrical isolation trench; and a cantilever arm structure is manufactured and formed in the common grating area, a titanium-platinum heating resistor, a grating electrode and a grounding electrode are manufactured, and the tunable laser is obtained after preparation of a P-surface electrode and an N-surface electrode is completed. The back-to-back double lasers share the thermal tuning grating, double-end light emitting and wavelength synchronous control are achieved, the cantilever arm structure of the grating ridge waveguide is manufactured, energy consumption of wavelength tuning is reduced, and a solution is provided for large-scale use of tunable light emitting chips in the future.

The invention provides a tunable laser and a wavelength adaptive control method thereof.The wavelength adaptive control is performed in real time through a microcontroller arranged in the tunable laser, the control method comprises the steps that real-time monitoring is performed, specifically, the voltage feedback value ADC of an etalon and the DAC value of heating power are monitored in real time, and a calculated value is obtained through calculation according to the formula a1 * ADC + a2 * DAC + a3; comparing the calculated value with a target value m lambda of the tunable laser; and calculating and judging whether a difference value delta between the test value and the target value is within a preset interval, if so, continuing monitoring, and if not, adjusting the input voltage and / or the heating power of the etalon and then continuing monitoring until the difference value delta between the calculated value of the formula a1 * ADC + a2 * DAC + a3 and the target value m lambda is within the preset interval, ending adjustment and continuing monitoring.

The invention provides a photoacoustic pumping imaging system based on pulse laser phase energy correction. The opto-acoustic pumping imaging system based on pulse laser phase energy correction comprises a 128-channel array ultrasonic acquisition system, two OPO tunable lasers and a digital delay pulse generator which form the opto-acoustic pumping imaging system, a 128 array element linear ultrasonic transducer and a 2 * 2 multimode fiber bundle; and a pulse laser phase energy correction system which needs to monitor and correct the phase of the laser pulse. The opto-acoustic pumping imaging system based on pulse laser phase energy correction provided by the invention realizes accurate phase correction and energy normalization based on precise synchronization of two acquisition systems, so that the system can significantly reduce the fluctuation of TTD data, improve the stability and reliability of results, improve the acquisition speed and signal-to-noise ratio of the system, and improve the imaging quality of the system. The detection limit is reduced.

The invention discloses a photoacoustic spectrum trace gas detection device and method based on a secondary demodulation technology. The device comprises a tunable laser, a laser collimation device, a focusing lens, a gas chamber, a quartz tuning fork resonance circuit, a first lock-in amplifier, a trigger capture circuit, a phase modulation circuit, a second lock-in amplifier and a control and signal acquisition device. In the aspect of automatic tracking of the frequency, the quartz tuning fork is integrated into an oscillator circuit, and automatic tracking of the laser modulation frequency is achieved. The oscillator circuit can automatically adjust the output according to the current resonant frequency of the quartz tuning fork, and ensures that the laser is always modulated at the optimal frequency. In the aspect of continuous phase modulation, traditional fixed phase setting is replaced, the phases of electric excitation and photoacoustic excitation are continuously modulated, and pure photoacoustic signals are separated by using two lock-in amplifiers, so that a complex phase calibration process is avoided, and the accuracy and stability of signal detection are improved.

The invention provides a broadband tunable light emitting chip based on an asymmetric multi-quantum well technology and a preparation method, the tunable light emitting chip comprises a plurality of laser units distributed in columns, and each column of laser units comprises a plurality of lasers connected in series; the laser units achieve single-waveguide laser output through cascade Y waveguide combination, each laser comprises an asymmetric multi-quantum well layer and a grating layer, the thickness of each quantum well is gradually decreased from top to bottom, and a grating is located on the surface of the upper limiting layer. The tunable lasers connected in series and in parallel are adopted, and single-waveguide laser output is achieved through cascade Y waveguide combination; the asymmetric multiple quantum wells are arranged, so that the overall tunable range of the laser can be widened; a sampling grating is manufactured through a reconstruction equivalent chirp technology to select a lasing wavelength, and pi phase shift is introduced to carry out phase matching so as to ensure single wavelength output; according to the invention, gains can be provided for a plurality of laser units, the density of monolithic integration is improved, the transmission capacity is increased, and the single-mode yield is improved.

Provided are a silicon-based tunable filter, laser and an optical module. The tunable laser comprises a semiconductor optical amplifier and a silicon photonic integrated chip, wherein a first coupler, a phase regulator and a tunable filter are provided on the silicon photonic integrated chip; the tunable filter comprises a flat-top band-pass filter structure, a Mach-Zehnder interferometry (MZI) structure and a micro ring resonation (MRR) structure, which are cascaded; gain light emitted by the semiconductor optical amplifier is coupled to the silicon photonic integrated chip by means of the first coupler, and a narrowband filtered optical signal is output by means of the tunable filter; and the phase of the gain light is regulated by means of the phase regulator so as to output single-peak narrowband laser light with a tunable target wavelength.

The invention belongs to the technical field of chemical detection, and particularly relates to a Raman-LIBS-mass spectrometry combined analysis device and analysis method.The Raman-LIBS-mass spectrometry combined analysis device comprises a multiple reflection time-of-flight mass spectrometer, an LIBS spectrometer, a Raman spectrometer and a common module; the common module comprises a first incident light path system, a second incident light path system, a high-definition observation system, a vacuum sample bin, a vacuum system and a control system; the first incident light path system is used for generating a femtosecond laser beam and performing three-dimensional denudation on a sample; and the second incident light path system is used for combining the tunable laser into a resonant ionization light path. Compared with the prior art, in-situ micro-area ultrahigh-resolution element and isotope analysis and imaging can be achieved, ultra-trace element and isotope analysis and isotope ratio analysis under strong matrix interference are achieved, and meanwhile high-resolution molecular structure and composition analysis and Raman scattering imaging can be conducted.

The invention relates to an optical fiber insertion loss and return loss test management system and method, an optical power detection module comprises an input optical power detection unit, an output optical power detection unit and a reflected light power detection unit, and further comprises an optical emission module, an optical switch matrix and a data processing module, and the optical emission module is a quantum dot tunable laser module; the optical switch matrix is a bionic optical switch matrix, and multi-channel optical path reconstruction is realized; the optical power detection module is internally provided with a multi-physical field sensing array and detects optical power data in real time; the data processing module is used for receiving the optical power data and processing the data; comprising a test module for acquiring optical power data based on the optical power detection module and calculating optical fiber insertion loss and optical fiber return loss according to the acquired optical power data. The technical problems that the insertion loss measurement error is influenced by temperature drift, the switching time of an optical switch is too long, the rapid detection requirement of a 5G bearing network for batch optical fibers is difficult to meet, the real-time sensing and compensation capability is lacked, and the test result is not accurate in a complex environment are solved.

A magnetometer with responsive material is provided that includes a PT symmetric assembly. The PT symmetric assembly includes gain material and responsive material that are positioned to achieve PT symmetry. The responsive material is configured to shift a resonance frequency of point defects in response to a magnetic field. A microwave antenna is configured to generate a microwave field of varying frequencies that engage the responsive material. A controller is configured to adjust a tunable laser source that is input into the PT symmetric assembly based on an output of the PT symmetric assembly to cause a gain generated by the gain material to match a loss caused by the responsive material. The controller is further configured to determine a strength of the magnetic field by determining one of a deviation from the exceptional point and an amplitude of the gain needed to reach the exceptional point.

The utility model discloses a tunable laser light source for spectrum sensing, which comprises a tunable DFB laser array chip, a star coupler chip, an SOA array chip and an optical fiber array which are connected through waveguides, tunable lasers in each row are connected through waveguides, the lasers with adjacent wavelengths are distributed on different waveguides, and the optical fiber array is connected with the star coupler chip. The light output end of each waveguide is provided with an SOA. According to the utility model, the star-shaped coupler is adopted to uniformly distribute energy of light with different wavelengths of the tunable laser array to each light output waveguide, and the energy respectively enters different fiber grating sensors or fiber MEMS sensors and the like to realize temperature or strain sensing at the same time and realize multiplexing tree-shaped sensing and demodulation at the same time; the energy loss in the transmission process is reduced; the chips of different material systems are coupled by adopting a photon lead bonding or butt joint growth technology, the photon lead bonding technology does not need high-precision alignment, the processing efficiency is high, low-cost hybrid integration among the chips is realized, and the device is integrally compact.