99 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 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 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 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 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 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.

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 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 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.

The utility model relates to a kind of device of pulse laser pulse sub-string, including pulse laser, laser attenuation device, laser beam-reducing device, laser polarization device, wave sheet, Pockels cell, output mirror, waveform detection device, and output mirror is to the waveform detection device output first light beam and to the original light path reflection second light beam;Laser polarization device side is also configured full mirror;Pockels cell is connected with high-voltage pulse generator, pulse laser is also connected with digital delay pulse signal generator, and digital delay pulse signal generator is used to send synchronization signal to high-voltage pulse generator to control high-voltage pulse generator to generate voltage pulse when pulse laser emits laser beam reaches Pockels cell.This application realizes the stable control and output of pulse sub-string by the electro-optic modulation characteristics of Pockels cell, compared with traditional method of improving laser repetition frequency, implementation is simple, and use component is less, while guaranteeing stability, reduce cost.

The application provides a laser polarization degree testing device applied to the technical field of detection, which comprises a thin film circuit, the surface of the thin film circuit is provided with an electrode contact point of a laser, a laser limiting device, the laser limiting device is provided with a clamping groove on a bearing surface, a conductive assembly, the conductive assembly is arranged on the laser limiting device close to the bearing surface, the conductive assembly comprises a support structure which can move up and down along a guide rail perpendicular to the bearing surface and at least two conductive contacts, the conductive contacts are fixed to the support structure and vertically correspond to the position of the electrode contact point, a rotating table, a through hole is formed in the rotating table shaft, a polarizer is fixedly arranged on the receiving surface of the rotating table, a photodiode, the photodiode is vertically arranged in the light output direction of the polarizer, the photosensitive surface of the photodiode is coaxial with the rotating table, and a controller, the controller is electrically connected with the conductive assembly, the rotating table and the photodiode through wires. The universality and operation convenience of the device can be enhanced.

The invention relates to a dual-frequency laser frequency aliasing suppression device which comprises a laser, a depolarization light splitting module, a signal detection module, a polarizer and a polarization light splitting module. In the actual use process of the dual-frequency laser frequency aliasing suppression device, polarization state degradation caused by a non-ideal optical element can be compensated through the arrangement of the depolarization light splitting module and the polarization light splitting module, and the optical axis of the polarization light splitting module is enabled to coincide with the polarization direction of the laser of a certain polarization state of the laser output by the laser; therefore, the frequency aliasing in the P light and the S light emitted by the polarization light splitting module is further reduced to a lower level. The optical path structure is simple, the adjusting speed is high, frequency aliasing after double-frequency laser polarization beam splitting can be effectively restrained, and the optical path structure is suitable for the occasion of double-frequency laser interference measurement.

The invention discloses an axisymmetric blazed grating precision displacement sensor and a measurement system, and relates to the technical field of grating precision displacement sensor measurement, the sensor adopts an axisymmetric distribution mode, a blazed grating assembly comprises a first blazed grating and a second blazed grating, and the first blazed grating and the second blazed grating are installed on the two sides of a displacement bearing assembly in an axisymmetric distribution mode; the laser outputs laser; the polarization beam splitting assembly divides the laser into two beams of polarized light with the same light intensity. The wave plate assembly performs polarization state conversion on the polarized light; the reflection assembly reflects the polarized light to the first blazed grating and the second blazed grating at a Littrow angle so as to diffract the polarized light; the polarization beam splitting assembly combines two beams of diffracted light diffracted by the first blazed grating and the second blazed grating and reflected by the reflection assembly; the light splitting detection assembly carries out light splitting and signal detection on the combined light to obtain interference signals, and displacement measurement is achieved. According to the invention, the displacement measurement precision and the diffraction efficiency can be improved.

The invention relates to the technical field of optical fiber lasers, in particular to a polarization maintaining optical fiber laser capable of switching pulses and a modulation method of the polarization maintaining optical fiber laser. The polarization-maintaining fiber laser capable of switching the pulses comprises a pumping source used for outputting pumping light; a polarization-maintaining wavelength division multiplexer, a polarization-maintaining optical fiber, a polarization-maintaining optical fiber isolator, a directional carbon tube saturable absorber and a polarization-maintaining coupler are sequentially connected in the light emitting direction of the pumping source; the directional carbon tube saturable absorber is coupled to the end face of the polarization-maintaining jumper, an included angle is formed between the directional carbon tube saturable absorber and the laser polarization direction in the polarization-maintaining jumper, and mode-locked pulses in various states are generated by adjusting the included angle. By directionally adjusting the included angle between the laser polarization direction and the directional carbon tube saturable absorber, more convenient, faster and more stable pulse switching is realized. According to the invention, an optical path structure or an optical element does not need to be frequently adjusted, and accurate pulse state switching can be realized only by adjusting the included angle between the polarization maintaining optical fiber and the directional carbon tube saturable absorber.

The present invention relates to a semiconductor device (10) for random number generation, comprising: a substrate (20); a VCSEL (30) which is arranged on the substrate (20); and a first photodetector (40) which is arranged on the same substrate (20) as the VCSEL (30); wherein the semiconductor device (10) has a polarization-selective reflector (50) which is designed to polarization-selectively reflect laser light (60) that has been emitted by the VCSEL (30) and has a first polarization (61) to the first photodetector (40). The present invention also relates to a system (80) and to a corresponding method (100) for random number generation.

The invention relates to the technical field of laser optical fibers, and discloses a five-dimensional precise adjustment miniaturized optical fiber coupler integrated with a half-wave plate, which comprises a base, the lower end of a coupling joint is inserted into the base from the top of the base, and an aspherical lens is correspondingly arranged below the coupling joint; the rear cover plate is arranged at the bottom of the base, and a fixed seat is arranged on the lower surface of the rear cover plate; the threaded connection seat is in threaded connection with the fixed seat; and the half-wave plate is arranged in the threaded connection seat, a first through hole for laser to pass through is formed in the middle of the rear cover plate, and the half-wave plate corresponds to the first through hole. The half-wave plate and the optical fiber coupler are integrated, so that the laser polarization state can be matched with the polarization characteristic of the optical fiber; the five-dimensional adjusting mechanism can drive the lens groove to move along the X axis, the Y axis and the Z axis, the position of the lens can be changed, the angle of the lens relative to the coupling joint can be changed, and the coupling precision is improved.

The invention provides a pulse laser polarization coherent beam combining system. The pulse laser polarization coherent beam combining system comprises a beam combining device, a polarization beam combiner, a first polarization controller, a second polarization controller and a phase control module. The beam combiner is used for combining the first sub-pulse laser and the second sub-pulse laser which are incident at the same time into main power linearly polarized light and secondary power linearly polarized light, and the energy proportion of the main power linearly polarized light is larger than that of the secondary power linearly polarized light; and the polarization beam combiner is used for receiving the primary power linearly polarized light and the secondary power linearly polarized light, carrying out beam combination and forming coherent output. By arranging a polarization controller and a phase control module, polarization state and phase adjustment is carried out on the primary power linearly polarized light and the secondary power linearly polarized light respectively, so that efficient coherent beam combination of the primary power linearly polarized light and the secondary power linearly polarized light is realized in the polarization beam combiner. According to the system, the strict requirements on the incident sub-pulse laser polarization state and power are relaxed, the beam combining efficiency is improved, the system is suitable for various polarization state inputs, and the universality and practicability of the system are enhanced.

The invention relates to a polarization-adjustable AlGaN optical pumping deep ultraviolet laser and a preparation method thereof, and belongs to the technical field of semiconductor deep ultraviolet light emitting. The laser comprises a substrate, an AlGaN stress regulation and control layer, an internal n-type AlGaN layer, an i-type AlGaN protection layer, a multi-quantum well layer, an i-type AlGaN protection layer and a transparent n-type AlGaN layer, wherein the multi-quantum well layer comprises a periodic AlyGa < 1-y > N / Al < x > Ga < 1-x > N / AlyGa < 1-y > N structures; the device further comprises an n-type upper electrode and an n-type lower electrode. According to the AlGaN deep ultraviolet laser, the Al component change of the AlGaN stress regulation and control layer is used for carrying out light emitting polarization regulation and control on the multi-quantum well layer, the internal n-type AlGaN layer and the transparent n-type AlGaN layer are used for applying an electric field to the multi-quantum well layer, the laser polarization of the laser is regulated and controlled under the condition of optical pumping lasing, and therefore the AlGaN deep ultraviolet laser with the polarization adjustable in the TE state and the TM state is achieved.

The present invention belongs to the field of quantum microwave measurement, and particularly relates to a lens-type omnidirectional multi-beam atomic receiving antenna and a manufacturing method thereof. By placing a number of atomic glass cell probes at any position on the spherical surface of a Luneburg lens, a directional high-gain narrow beam is formed in any required direction, and the polarization direction of the received electromagnetic wave is determined by the laser polarization direction of the atomic cell probe. The beneficial effect of the present invention is that, by using the atomic cell probe as a feed port, multiple probes can be placed on the surface of the Luneburg lens sphere, which can not only increase the gain through the Luneburg lens and form multiple beams, but also avoid the inability to achieve omnidirectional multi-beams caused by feed blockage, thereby increasing the detection sensitivity of the atomic receiving antenna and supporting the application of the quantum microwave measurement system in electronic information fields such as radar, communication, electronic countermeasure, and navigation.

To provide a vehicle projection device capable of improving utilization efficiency of light.SOLUTION: A vehicle projection device 1 according to the embodiment comprises: a plurality of projectors 30 projecting an image; and a light source unit 10 supplying light to the plurality of projectors 30. The light source unit 10 includes: a laser light source 11 emitting a laser beam with a first polarization component; a polarization rotation unit 12 rotating the polarization direction of the laser beam emitted from the laser light source 11; and a branch part 14 branching a laser beam passing through the polarization rotation unit 12 into the first polarization component and a second polarization component other than the first polarization component and supplying it to each of the plurality of projectors 30.SELECTED DRAWING: Figure 2