132 results about "Laser polarization" patented technology

The invention discloses a dynamic optimization method and device for an automatic fiber placement path of a composite material and a medium, and belongs to the technical field of automatic fiber placement of composite materials. The method comprises the steps that a three-dimensional model of a component to be laid is obtained, and curved surface curvature distribution characteristics and fiber laying angle constraints are obtained based on the three-dimensional model; processing the curved surface curvature distribution characteristics based on a path planning algorithm to generate an initial fiber placement path; on the basis of the tension mapping table and the temperature compensation coefficient, the fiber placement head is driven to execute reverse pre-tension control; acquiring actual fiber trend data according to a preset sampling period based on a polarization laser polarization instrument, and extracting a fiber angle deviation of the actual fiber trend data; processing the fiber angle deviation and the resin viscoelasticity data based on a Bayesian optimization algorithm so as to dynamically correct the laying path and generate an updating instruction; and adjusting the spatial pose and tension of the fiber placement head according to the updating instruction. Based on the method, dynamic multi-target fiber placement path optimization and real-time feedback control are realized.

The invention discloses a chip atom vector magnetometer based on a topological posture surface emitting laser. The device is characterized by comprising a topological posture PCSEL, a beam shaping unit, a polarizer, a quarter-wave plate, a voltage-controlled laser polarization rotator, an atomic gas chamber, a Wollaston prism, a dual-channel photoelectric detector, a filter module, a laser frequency stabilization unit, a precession signal modulation and demodulation module and a laser polarization and Larmor magnetic field direction adjustment module, the system comprises a two-dimensional Larmor magnetic field coil, a servo feedback module, a direct digital frequency synthesis module and a high-stability crystal oscillator. The topological posture laser is used for the chip atom vector magnetometer, magnetic vector parameter measurement which is more immune to temperature fluctuation and more excellent in performance is innovatively achieved for an external magnetic field, complete information of the vector magnetic field can be measured at the same time, and the chip atom vector magnetometer can be used for the fields of material defect detection, mineral oil and gas exploration, underwater magnetic target positioning and the like.

The invention provides a 2-micron high-order Poincare sphere vector vortex ultrafast laser polarization detection method, which comprises the following steps of: performing out-cavity and out-cavity beam splitting on 2-micron high-order Poincare sphere vector vortex ultrafast laser through a beam splitting module, directly detecting light intensity spatial distribution by one beam, and dynamically regulating and controlling the out-cavity of a polarization state by the other beam after the other beam enters a polarization regulation and control module; the computer communicates with the ESP32 development board to control the hollow rotary displacement table to change the forward included angle between the fast axis and the x axis of the vortex quarter-wave plate so as to change the polarization state of incident light; through the ultrafast laser polarization beam splitter, the polarization state of passing light is limited, and horizontal line polarized light perpendicular to a beam splitting surface passes through the ultrafast laser polarization beam splitter; dynamically detecting real-time data of light intensity which is dynamically adjusted outside the cavity through the polarization regulation and control module each time through a light intensity detection module; and the polarization analysis module receives regulation and control parameters of the polarization regulation and control module and light intensity parameters of the power detection module, analyzes the polarization state of a light beam input into the system, and completes 2-micron high-order Poincare sphere vector vortex ultrafast laser polarization detection.

The invention discloses a device for dynamically regulating and controlling a laser polarization state based on an acousto-optic device, and belongs to the technical field of laser, and the device comprises a laser beam splitting unit which is used for carrying out beam splitting on incident laser according to the polarization state and the polarization angle of target laser to be generated and generating two beams of linearly polarized laser with adjustable propagation directions and light beam intensity; the acousto-optic phase control unit is used for performing acousto-optic modulation on the linear polarization laser of the second light path to change the phase of the linear polarization laser and compensating the frequency deviation of the linear polarization laser of the second light path so as to control the phase difference between the linear polarization laser of the second light path and the linear polarization laser of the first light path; and the light beam direction adjusting assembly is used for controlling the two beams of linearly polarized laser to enter the polarization beam combining unit at the same time so as to obtain target laser. The laser polarization state control device is simple in structure and low in cost, various pulse strings with specific polarization modes can be generated, and therefore the technical problems that a laser polarization state control device is complex in structure, high in cost, poor in control flexibility and low in regulation and control frequency are solved.

The invention relates to the technical field of optical precision measurement, in particular to an ultra-high time resolution camera time characteristic detection device and method, and the device comprises a laser source which is used for generating pulse laser; the polarization modulation element is arranged on an emergent light path of the laser source and is used for modulating the pulse laser into circularly polarized light; the spectroscope is arranged on an emergent light path of the polarization modulation element and is used for decomposing the circularly polarized light into a first linearly polarized light beam and a second linearly polarized light beam; the first optical path unit is used for guiding the first linearly polarized light beam to the cylindrical optical element along a fixed optical path; the second optical path unit is used for adjusting the optical path of the second linearly polarized light beam and guiding the second linearly polarized light beam to the cylindrical optical element; and the cylindrical optical element is used for receiving the first linearly polarized light beam and the second linearly polarized light beam and respectively projecting the first linearly polarized light beam and the second linearly polarized light beam to an imaging surface of a camera to be detected to form two spatially separated light spots. The objective of the invention is to improve camera time characteristic calibration precision and efficiency.

The invention discloses a method for generating a polarization-adjustable extreme ultraviolet light source, which relates to the technical field of ultrafast laser, and comprises the following steps: preparing different electronic states of triple symmetric molecules; the linear polarization incident laser interacts with different electronic states of the triple symmetry molecules to generate higher harmonics, the included angle between the polarization direction of the linear polarization incident laser and the molecular axis is adjusted until the distribution of ellipsometry of different electronic states along with the arrangement angle is obtained, and the harmonic stages required by the extreme ultraviolet light source with different ellipsometry are selected to generate the extreme ultraviolet light source with different ellipsometry. The harmonic ellipsometry rate in the harmonic stage changes along with the change of the arrangement angle; the wave spectrums of the two harmonic components in the harmonic stage are synthesized into attosecond pulses, and extreme ultraviolet light sources under different ellipsometry rates are obtained after synthesis; the generated extreme ultraviolet light source is adjustable in polarization and short in pulse width.

The invention relates to the technical field of bridge disease detection, in particular to a bridge underwater disease detection system and method based on array imaging, and the system is characterized in that in a disease detection registration module, "sonar-laser-polarization" three-mode independent calculation and double-reference constraint are carried out; by combining the layered coaxial integrated design of a mark point, namely an acoustic reflection unit and an optical diffuse reflection unit, high-precision initial registration of sonar coordinate calculation errors, laser ranging correction errors and polarization three-dimensional conversion errors is realized, and the problem of multi-modal data scale drift is solved; the bridge pier path scanning module realizes complete coverage of bridge pier curved surface disease detection through scenarized adaptation of a spiral-radial swing track and a variable pitch spiral track aiming at the contradiction between the fixed curvature of a detection ring and the dynamic change of the curvature of a bridge pier, and effectively solves the problem of mismatching of a coverage gap and a posture of a traditional fixed path.

The invention discloses a beat frequency coding type multi-wavelength optical fiber laser ultrasonic detection positioning system, which comprises an optical pumping device, an optical acquisition device, a signal demodulation device and an optical fiber laser ultrasonic sensing array, and is characterized in that the optical fiber laser ultrasonic sensing array comprises at least three dual-polarization optical fiber lasers which are not distributed on the same straight line; and the dual-polarization fiber lasers are used for generating at least three paths of single-frequency dual-polarization laser under the excitation of the pump light, and each dual-polarization fiber laser has different beat frequencies and output wavelengths. The ultrasonic detection positioning system modulates and demodulates the frequency of each laser polarization beat frequency signal based on an ultrasonic signal, is high in sensitivity, does not need extra time division and wavelength division multiplexing modules, and greatly reduces the complexity of the system. The invention further discloses a demodulation method of the ultrasonic detection positioning system.

The invention provides a Faraday sheet performance measurement and polarization imaging system and method, and relates to the technical field of optical testing. The system comprises a light source system, an optical research platform, a polarizer, a first analyzer, a microscopic imaging system and an image acquisition system, the light source system is used for emitting laser; the optical research platform is used for arranging a to-be-measured Faraday sheet and generating a magnetic field; the microscopic imaging system comprises an eyepiece and an objective lens, and the image acquisition system comprises an image acquisition mechanism; in the first propagation direction of the laser, the light source system, the polarizer, the Faraday piece to be measured, the objective lens, the first polarization analyzer, the eyepiece and the image acquisition mechanism are sequentially arranged. According to the Faraday piece performance measurement and polarized light imaging system, the laser polarization state is accurately controlled, the polarization direction change is accurately detected, and the amplification and focusing functions of a microscopic imaging system are combined, so that the accuracy and comprehensiveness of the performance test of the Faraday piece adopting a magneto-optical film are improved, and the test cost is reduced.

The invention discloses a femtosecond laser direct-writing Type X structure-based geometric phase fork-shaped grating, a preparation method and application of the femtosecond laser direct-writing Type X structure-based geometric phase fork-shaped grating in vortex light, and belongs to the technical field of laser processing, and the femtosecond laser direct-writing Type X structure-based geometric phase fork-shaped grating comprises design and parameter calculation of a geometric phase fork-shaped grating device, determination of a processing parameter window of a Type X structure and the femtosecond laser direct-writing fork-shaped grating. According to the invention, femtosecond laser is utilized to induce and generate an anisotropic nanopore structure with ultra-high transmittance higher than 97% in fused quartz and other transparent materials, namely a Type X structure, the structure has a birefringence characteristic, and the slow axis angle of the structure is always perpendicular to the laser polarization direction, so that the slow axis angle can be continuously adjusted by adjusting laser polarization. The Type X structure serves as a metasurface unit of the geometric phase fork-shaped grating, geometric phase regulation and control are achieved by controlling slow axis orientation of the Type X structure, and therefore generation and regulation and control of vortex light are achieved. The method is high in efficiency and simple in process.

The invention discloses a 2-micron base-order ultrafast laser polarization detection device and method based on a Poincare sphere. The device comprises a polarization regulation and control module, a power detection module and a polarization analysis module, the polarization regulation and control module comprises a quarter-wave plate, an electric rotary displacement table and a polarization beam splitter; the power detection module comprises a power detector; the polarization analysis module comprises a data processor; and the data processor is respectively connected with the electric rotary displacement table and the power detector. The method comprises the following steps: placing the electric rotary displacement table and the quarter-wave plate on an x-o-y plane; enabling the x direction and the y direction of the input laser to generate # imgabs0 # phase difference; adjusting the polarization beam splitter to enable the polarization state of the laser penetrating along the optical axis to be only in the vertical direction; and calculating Stokes parameters and polarization state data, outputting and storing the calculated data, and meanwhile, displaying the laser polarization state data and polarization state images. According to the device and the method, efficient, accurate and rapid detection operation of the 2-micron wave band ultrafast laser polarization state can be realized.

A CPT magnetometer sensitivity improving method based on magnetic field modulation in geomagnetic prospecting comprises the following steps: performing half-wave modulation on laser generated by a laser by using an EOM to obtain multicolor laser, and weakening the light intensity and changing the polarization state of the laser through a light intensity adjusting device; meanwhile, sine wave modulation is applied to the magnetic field where the air chamber is located, a lock-in amplifier is used for demodulating optical signals through sine wave modulation signals to obtain corresponding dispersion signals, and the size of the magnetic field to be measured in geomagnetic prospecting is further obtained. The sensitivity of the magnetometer modulated by the magnetic field is close to the sensitivity obtained by the traditional laser light source modulation method, but the magnetic field modulation method gets rid of the difficulty of too high requirement on the laser light source, and the coil structure and principle are relatively simple and are more suitable for a complex working environment. In conclusion, the CPT atomic magnetometer based on the magnetic field modulation method can be widely applied to the fields of magnetic field drawing, mineral exploration and the like, has the characteristics of high precision, high resolution and the like, and also shows a wide market application prospect in the aspects of miniaturization, low power consumption and the like.

The invention discloses an integrated polarization, multi-wavelength and multi-frequency photoacoustic tomography device, which comprises a light source assembly, a polarization assembly, a signal receiving assembly and a signal processing assembly, and is characterized in that the light source assembly is used for generating collimated pulse laser with different wavelengths, and the polarization assembly can enable the pulse laser with different wavelengths to generate a polarization state; the polarization angle of the light beam is changed, the signal receiving assembly can detect a photoacoustic signal after the polarized light irradiates a sample, the signal processing assembly is used for amplifying and collecting the photoacoustic signal, the multi-wavelength light source is adopted as an excitation light source, and the polarization assembly enables the laser of each wavelength to generate a polarization state; according to the multi-wavelength multi-frequency photoacoustic imaging system and the multi-wavelength multi-frequency photoacoustic imaging method, a plurality of ultrasonic transducers with different center frequencies are utilized to detect photoacoustic signals, so that polarized light acoustic imaging, multi-wavelength photoacoustic imaging and multi-frequency photoacoustic imaging can be combined, and the purpose of multi-angle and multi-parameter biomedical imaging is achieved.

The invention discloses a self-adaptive three-beam interference super-resolution microscopic imaging system and method, a light source module generates laser which sequentially passes through a polarization beam splitting module and an electro-optic phase modulation module, three beams of laser subjected to phase modulation are output, and the three beams of laser pass through an optical path compensation module to complete optical path compensation; then the laser enters the laser polarization vector modulation module for polarization modulation, the modulated laser enters the aberration correction module through the laser beam combining module, three beams of light irradiate a sample on a displacement table after aberration correction, fluorescence excited by the sample passes through the aberration correction module again to complete aberration correction, and then an image is obtained through the filtering imaging module. And the acquisition control module synchronously controls the electro-optic phase modulation module, the laser polarization vector polarization modulation module and the aberration correction module and receives an image shot by the filtering imaging module, so that high-speed real-time super-resolution microscopic imaging and high-quality aberration correction are finally realized, the three-dimensional resolution of the image, especially the resolution along the axial direction, is improved, and the imaging quality is improved. And artifacts in the image are reduced.

The invention discloses a laser polarization state control device and method for ultrafast laser processing, and belongs to the field of laser processing, the laser polarization state control device comprises a laser, an electric 1 / 2 wave plate, a spatial light modulator, a reflector group, an electric 1 / 4 wave plate, a spectroscope, a polarization detection system and a control module, the electric 1 / 2 wave plate, the spatial light modulator and the electric 1 / 4 wave plate are all electrically connected with the control module, and the control module is used for controlling the electric 1 / 2 wave plate to rotate, controlling the spatial light modulator to perform phase modulation and controlling the electric 1 / 4 wave plate to rotate. Therefore, the adjustable range of the polarization state of the laser beam can be improved, and the laser polarization state control device can achieve modulation of radial polarization and angular polarization.

According to the photoacoustic film thickness measuring system and method provided by the invention, the laser polarization adjusting device or the wafer rotating assembly is introduced into the measuring system, and the polarization state of femtosecond pulse laser or the wafer angle is adjusted according to the signal-to-noise ratio of the measured data; the influence of polarization direction of femtosecond pulse laser and wafer lattice orientation mismatch on measurement stability is eliminated, and the signal-to-noise ratio of a measurement signal is improved.

The invention discloses an ultrafast laser pulse interference thermal expansion coefficient measuring device and method, and the device comprises a pulse laser, a polarization beam splitting module, a first polarization beam splitting prism, a first cavity mirror structure, a second cavity mirror structure, a four-step phase shift detection module, an oscilloscope, and an upper computer. The polarization light splitting module divides the laser into a plurality of parallel light beams; the first polarization splitting prism divides the plurality of parallel light beams into first reflection polarized light and first transmission polarized light; the first cavity mirror structure receives the first reflected polarized light and outputs first multi-stage reflected light to the first polarization splitting prism; the second cavity mirror structure receives the first transmission polarized light and outputs second multi-stage reflected light to the first polarization splitting prism; the four-step phase shift detection module outputs four paths of interference signals; the oscilloscope receives the four paths of interference signals and presents interference measurement sine wave information; and the upper computer obtains thermal expansion coefficient measurement information. According to the invention, the high thermal expansion measurement precision of various optical mirror materials can be improved.

The invention discloses a polarization-adjustable antiferromagnetic terahertz source based on a MnPt heterojunction. The polarization-adjustable antiferromagnetic terahertz source comprises a MnPt antiferromagnetic thin film layer, a light metal layer and an anti-oxidation layer, according to the invention, the femtosecond laser is used for exciting the femtosecond laser to generate the terahertz wave, the polarization direction of the generated terahertz wave is changed along with the change of the polarization direction of the femtosecond laser, that is, the polarization direction of the laser is changed by 1 degree, the polarization direction of the terahertz is changed by 2 degrees, the change of the azimuth angle of a sample is not needed, and the width of the generated terahertz spectrum exceeds 5 THz. No extra heavy metal layer needs to be added, the size is miniature, and the thickness is smaller than 40 nm. By adjusting polarization and phase difference of femtosecond laser, adjustability of a linear polarization state, an elliptical polarization state or a circular polarization state can be achieved, the structure is simple, a needed light path is simple, assistance of an external magnetic field or current is not needed, micromachining is not needed, the ultra-high external magnetic field interference resistance is achieved, the cost is reduced, and the application range is wide. And integration of the terahertz source is also facilitated.

The invention provides a piezoelectric film preparation method based on femtosecond laser processing and a piezoelectric energy collector, and relates to the technical field of piezoelectric equipment. NaNbO3amp is irradiated by femtosecond laser; on the surface of the P (VDF-TrFE) composite film, when femtosecond laser irradiates the surface of a substance, light and the substance can interact with each other, non-polar alpha-phase disordered molecular chains in a non-polarized state are rearranged under the rapid and short-time driving force of femtosecond laser polarization, the influence of disordered factors such as thermal motion is overcome, ordered arrangement is achieved, a beta-phase structure with dipole moment is formed, and the surface of the P (VDF-TrFE) composite film is formed. The NaNbO3amp is enhanced; the P (VDF-TrFE) composite film has the advantages of good piezoelectric property, low operation requirements, high processing efficiency and reduced production cost.

The invention relates to the field of optics, and provides a device and a method for measuring an angle resolution polarization Raman spectrum. The angle resolution polarization Raman spectrum measuring device comprises a connecting mounting plate which is used for mounting the measuring device in a light path of a Raman spectrometer; the rotary mounting seat is fixed on the connecting mounting plate; the angle rotary table is arranged in the rotary mounting seat and is driven by the driving part to rotate; and the wave plate is mounted on the angle turntable and is used for changing the polarization directions of the incident laser and the Raman signal light through the wave plate. The angle resolution polarization Raman spectrum measuring device solves the problem of rotation and displacement of tiny samples, ensures in-situ and continuous measurement of small-size samples such as two-dimensional materials and nanoparticles, and compared with a traditional manual rotation wave plate mode, the angle setting error is reduced, the laser polarization direction is ensured to be adjusted according to preset precision, and the measurement accuracy is improved. And the high-resolution polarization measurement requirement is met.

The invention provides a near-field saturation signal attenuation device and method based on an acousto-optic modulator, which can be applied to the technical field of laser radars. The device comprises a laser emitting module used for emitting incident pulse laser; the polarization splitting prism is used for carrying out incident light screening on the incident pulse laser to obtain parallel polarization pulse laser; the acquisition module is used for transmitting the parallel polarization pulse laser to a target position and acquiring an echo light signal generated by scattering of the target position, and the echo light signal comprises a near-field saturation signal and a far-field echo signal; the attenuation module is used for carrying out signal attenuation on the near-field saturation signal acquired by the acquisition module under the condition that the echo optical signal is determined to be the near-field saturation signal, so as to obtain a target echo optical signal; and the photoelectric detector is used for carrying out data processing on the target echo optical signal and the far-field echo signal emitted by the attenuation module to obtain target data for analyzing the target position.

The present invention discloses a real-time closed-loop control device and method for laser polarization in an optically pumped atomic gas chamber, and belongs to the technical field of high-precision atomic spin magnetic field and inertial measurement. The present invention is based on atomic spin optical pumping technology and first-order differential control technology, and uses a liquid crystal phase retarder to realize polarization state modulation of the pumping light. The optical power change of the pumping laser passing through the polarized atomic gas chamber is detected by a photodetector, and a first-order differential signal is extracted as an error signal by a phase-locked amplifier. The polarization state of the pumping light is stably controlled at a circular polarization point, and laser polarization modulation detection and closed-loop control are realized. The present invention effectively improves the optical pumping efficiency and the long-term stability of the electronic polarization rate, and can be widely used in quantum precision measuring instruments including optically pumped atomic gas chambers, such as atomic gyroscopes, atomic magnetometers, atomic gravimeters, etc., and is particularly suitable for small quantum sensors that pursue high integration.

The application provides a laser modification processing method and a processing system for eliminating cleavage surface crack deflection. The spatial intersection line of the crystal natural cleavage surface and the macro processing surface is solved by cross multiplication operation, and the intersection line direction is locked as the laser polarization direction. The scanning direction is orthogonal to the polarization direction, and an asymmetric light intensity distribution compressing in the scanning direction and stretching in the polarization direction is constructed. A constraint model of micro-step height and laser focal depth is established, the step height is controlled to be less than the focal depth by controlling the dot spacing, the longitudinal stress is used to bridge the micro-cracks, and large-area smooth peeling is realized. The application does not need mechanical rotating parts, can effectively inhibit crack deflection, eliminate the stepped fracture caused by the inclination of the cleavage surface, and obtain a smooth peeling surface.

The invention relates to the technical field of waste liquid crystal panel separation and recovery treatment, and discloses a separation device and method for a polarizing film on a waste liquid crystal panel, and the separation device comprises a working table, a laser polarization separation mechanism, a movable support mechanism and a scraper knife automatic collection mechanism; a clamp is installed on the working table top and used for fixing a liquid crystal panel. The laser polarization separation mechanism comprises a light source assembly and a laser galvanometer cleaning head, and the light source assembly is electrically connected with the laser galvanometer cleaning head; the laser galvanometer cleaning head faces the liquid crystal panel; the movable support mechanism is installed between the working table and the light source assembly, and the laser galvanometer cleaning head is installed at the movable end of the movable support mechanism. And the automatic scraper knife collecting mechanism is mounted on the working table. According to the device, automatic separation of the polarizing film and the glass substrate in the waste liquid crystal panel is achieved, the whole process is efficient and low in pollution, the recycling treatment cost of the liquid crystal panel is reduced, and meanwhile the disassembling efficiency is greatly improved.

The invention relates to the technical field of optical polarization state measurement, in particular to a laser polarization state real-time measurement analyzer which comprises collimators, a non-polarization beam splitter, a 1 / 4 wave plate, a compensation module and a polaroid. The first non-polarization beam splitter divides two light beams into a second non-polarization beam splitter, a 1 / 2 wave plate and a third non-polarization beam splitter respectively, and the second non-polarization beam splitter divides two light beams into a second collimator and a third collimator respectively through a first polaroid and a second polaroid; the third non-polarization beam splitter divides two paths of light beams into a fourth collimator and a 1 / 4 wave plate through a third polaroid, the fourth polaroid enters a fifth collimator, the second collimator, the third collimator, the fourth collimator and the fifth collimator are connected to an oscilloscope through four photoelectric detectors, and the upper computer collects data of the oscilloscope and calculates the real-time polarization state of the laser. The method is simple, high in precision and low in cost, and realizes real-time measurement of the laser polarization state.

The invention discloses a discontinuous short pulse laser incoherent polarization time sequence synthesis device, and relates to the technical field of laser synthesis. The device comprises a beam combiner, and the beam combiner is used for combining multiple paths of lasers with mutually vertical polarization states of a main laser beam and an auxiliary laser beam into coaxially propagating light beams, so that the space structures of the two laser beams in a near field and a far field are completely overlapped, and the directivity is the same. The polarization state of the synthesized laser is consistent, and light amplification can be realized through the same amplifier; the device is suitable for synthesizing sub-laser with a wide repetition frequency range and supports repetition frequencies from several hertz to hundreds of hertz; in addition, the device can synthesize three or more paths of laser, the repetition frequency of the synthesized laser is the sum of the repetition frequencies of all sub-lasers, and the device has high expansibility and flexibility and is suitable for various complex laser application scenes.

The present disclosure describes systems and methods for laser diagnostics systems (e.g., systems and methods for beam combination in heterodyne interferometers and polarimeters). For instance, a laser beam combiner, including a modulator and a wedge combiner, may be implemented in a heterodyne dispersion interferometer. In some cases, a modulator receives laser light (e.g., the laser light having a combination of a vertical polarization component and a horizontal polarization component) and the modulator shifts a frequency of the laser polarization components relative to the other. A wedge combiner having an index of refraction, and the wedge combiner comprises a mirror surface coating a and transmissive surface coating configured to effectively combine different polarization components of the laser light using transmission and reflection techniques, according to embodiments described herein.

The invention discloses an optical fiber laser and a laser pulse state tuning method, and relates to the technical field of ultrafast laser, the optical fiber laser comprises an optical resonant cavity, a polarization controller, a polarization-maintaining wavelength division multiplexer, a first polarization-maintaining optical fiber isolator, a second polarization-maintaining optical fiber isolator and a polarization-maintaining single-mode semiconductor pump laser; the optical resonant cavity comprises a mode-locked laser generation module and a tuning module, and can generate mode-locked laser in various mode-locked states; the polarization controller is used for adjusting the polarization state of the pump light or the mode-locked laser, the polarization-maintaining wavelength division multiplexer is used for multiplexing and demultiplexing the pump light or the mode-locked laser, and the polarization-maintaining optical fiber isolator ensures one-way propagation of the light. The internal parameters of the laser are directly regulated and controlled through the temperature tuning or angle tuning module, the complexity of external light path adjustment is avoided, the high repetition frequency of mode-locked laser pulses and the long-term stability of the laser in the long-time operation process are ensured, and the diversified requirements of different application fields for the performance of an ultrafast laser light source are met.

The utility model relates to the technical field of laser polarization interference measurement, and discloses a split type groove sealing structure which comprises a first flange, a second flange and a third flange which are sequentially connected to the outer wall of a quartz tube in a sleeved mode, and the first flange abuts against the cavity wall; a first sealing groove is formed in the face, facing the cavity wall, of the first flange, and a first sealing ring is arranged in the first sealing groove. A second sealing groove is formed between the second flange and the first flange, a third sealing groove is formed between the third flange and the second flange, and a second sealing ring and a third sealing ring which abut against the quartz tube are arranged in the second sealing groove and the third sealing groove respectively; the first sealing ring prevents media such as gas from entering the cavity from the radial direction of the quartz tube, and the second sealing ring and the third sealing ring abut against the outer wall of the quartz tube respectively, so that second-order axial sealing can be provided for the quartz tube under the condition that the machining error of the outer wall of the quartz tube is large, and the service life of the quartz tube is prolonged. Media such as gas are prevented from entering the cavity along the axis direction of the quartz tube.

This invention belongs to the field of laser pulse polarization control technology, and discloses a high-intensity laser pulse polarization state control system and method. The system includes a laser, a polarization controller, a processing device, and a central control unit. The laser generates and outputs laser pulses; the polarization controller receives the laser pulses emitted by the laser and rapidly adjusts their polarization direction; the processing device applies the polarization-adjusted laser pulses to the processing material; and the central control unit is electrically connected to the laser, polarization controller, and processing device to achieve synchronous control of these components. This invention, employing the aforementioned high-intensity laser pulse polarization state control system and method, achieves a technological breakthrough in ultra-intense laser polarization control through the innovative application of plasma media, possessing high tolerance, high precision, and adaptability, filling a technological gap in this field.