320 results about "Fast axis" patented technology

The invention relates to the technical field of laser, in particular to a dual-wavelength narrow-linewidth laser output device and method.The dual-wavelength narrow-linewidth laser output device comprises a semiconductor laser unit emitting linearly polarized light beams, and a light beam conversion lens is used for achieving conversion of semiconductor laser fast-axis light beams and semiconductor laser slow-axis light beams; the light beam conversion lens is used for collimating and compressing a semiconductor laser fast axis divergence angle, and the slow axis collimating lens is used for collimating and compressing a semiconductor laser slow axis divergence angle; the linearly polarized light beam is divided into a first light beam and a second light beam through the rectangular prism; the first light beam sequentially passes through a first volume Bragg grating, a first reflector, a half-wave plate and a polarization beam combiner; the second light beam sequentially passes through a second volume Bragg grating, a second reflector and a polarization beam combiner; the dual-wavelength narrow-linewidth semiconductor laser can solve the problems of precise regulation and control and power amplification of the central wavelength of the dual-wavelength narrow-linewidth semiconductor laser, has power expansibility, and realizes improvement of laser power by stacking a plurality of laser units in the vertical direction.

The utility model provides a multi-single-tube semiconductor laser diode densely-arranged beam shaping and coupling device, comprising a semiconductor array laser used for emitting a first beam array and carrying out fast and slow axis collimation to obtain a second beam array; the light beam reflection separation system is used for performing separation arrangement on the second light beam array; the fast and slow axis conversion system is arranged on a light path where the light beam is emitted by the light beam reflection separation system and used for rotating the fast and slow axis of the second light beam array which is separated and arranged by 90 degrees; the confocal beam shrinking and expanding system is used for simultaneously focusing the fast axis light spots and the slow axis light spots of the separated and arranged second light beam array and then carrying out fast axis beam shrinking and slow axis beam expanding to obtain a third light beam array; the light beam reflecting and combining system is arranged on the light beam emergent light path of the confocal beam shrinking and expanding system and is used for closely arranging the third light beam array; and the focusing system is arranged on a light path where the light beams are emitted by the light beam reflecting and combining system, and is used for focusing the light spots of the closely arranged third light beam array to a target size.

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 light paths, and particularly discloses a laser shaping system and a laser printer, the laser shaping system comprises an LD collimating lens, a rotating mirror, a focusing lens and a focusing surface which are arranged in sequence; the LD collimating lens is used for receiving a first fast-axis laser beam and a first slow-axis laser beam, converting the first fast-axis laser beam into a fast-axis collimated beam, and converting the first slow-axis laser beam into a slow-axis collimated beam; wherein the fast axis collimated light beam and the slow axis laser light beam are parallel light beams; the rotating mirror is used for performing deflection processing on the fast-axis collimated light beam to obtain a second fast-axis laser beam, and performing deflection processing on the slow-axis laser beam to obtain a second slow-axis laser beam; and the focusing lens is used for focusing the second fast axis laser beam and the second slow axis laser beam to the focusing surface. The invention can bear high-power laser, and is low in light path cost and easy to process.

Provided are: an optical laminate which uses a biaxially stretched polyethylene terephthalate film as a base material, has bending resistance, and in which iris irregularities are suppressed; and an image display device which uses the optical laminate. This optical laminate is used in an image display device, and is provided with: a light-transmitting base material which is formed from a biaxially stretched polyethylene terephthalate film and which has in-plane birefringence; and an optical functional layer provided on one surface of the light-transmitting substrate, the arithmetic average roughness Ra of the surface of the optical functional layer being 0.04 [mu] m or more, the average inclination angle [theta] a of unevenness present on the surface of the optical functional layer being 0.30 DEG or more, and the in-plane retardation Re of the light-transmitting substrate defined by formula (1): Re = (nx-ny) * d being 2,000 nm to 7500 nm (inclusive). Here, nx is the refractive index in the slow axis direction, ny is the refractive index in the in-phase axis direction, and d is the thickness of the translucent substrate.

The invention discloses an air-cooled miniature slab laser based on double-end pumping, and belongs to the technical field of solid laser. Wherein the first conduction cooling single bar and the second conduction cooling single bar are arranged at the upper end and the lower end of the lath laser crystal in a staggered manner to form a double-end pumping structure; after the first fast axis collimation cylindrical lens and the second fast axis collimation cylindrical lens respectively collimate the fast axis directions of the first conduction cooling single bar and the second conduction cooling single bar, partial end surfaces are injected into the lath laser crystal; the first resonant cavity reflector and the second resonant cavity reflector are located at the left end and the right end of the lath laser crystal; the laser injected into the slab laser crystal passes through the resonant cavity mirror and then is subjected to multi-pass back-and-forth oscillation between the first resonant cavity reflector and the second resonant cavity reflector to reach the resonant cavity output cavity mirror. The output monopulse energy is greatly improved, the overall electro-optical efficiency is high, and the system compactness is high.

The invention discloses a wavelength and repetition frequency independent adjustable gain-competition-free polarization-maintaining fiber common-cavity double-optical-comb mode-locked laser and an adjusting method, and relates to the technical field of optical frequency combs. In order to solve the problems that a system is easily influenced by an external environment, the anti-interference capability is poor and gain competition exists between optical combs due to the existence of a single-mode optical fiber in an existing optical fiber double-optical-comb structure, the invention provides an optical fiber double-optical-comb structure. According to the technical scheme, the laser comprises a polarization-maintaining pump laser, a first polarization-maintaining optical fiber coupler, a polarization-maintaining optical fiber wavelength division multiplexer, a polarization-maintaining ytterbium-doped optical fiber, a polarization-maintaining collimator and a blazed grating, laser output by a second polarization-maintaining optical fiber coupler is combined through a polarization-maintaining polarization beam combiner, and the polarization-maintaining polarization beam combiner serves as a horizontal polarizer and a vertical polarizer; the separated polarized laser is respectively coupled to a slow axis and a fast axis of a common-end tail fiber, and a semiconductor saturable absorber is used as a reflection end face. According to the invention, a full polarization-maintaining structure is adopted, the external environment resistance is strong, and the stability is greatly improved.

A multi-junction laser-diode module includes (a) a multi-junction laser diode having a plurality of laser junctions stacked in a vertical dimension parallel to the fast-axes of the laser beams emitted by the laser junctions, (b) a fast-axis cylindrical lens collimating each laser beam in the fast axis, whereby the laser beams emerge from the fast-axis cylindrical lens with mutually nonparallel propagation directions, (c) a transmissive beam-deflecting element that deflects the laser beams in the fast-axis dimension after the fast-axis cylindrical lens to make their propagation directions parallel, and (d) a slow-axis cylindrical lens configured to collimate each laser beam in the slow axis. The transmissive beam-deflecting element corrects for the propagation-direction discrepancy between the laser beams, in the fast-axis dimension, caused by fast-axis collimation. The multi-junction laser-diode module can thereby produce a laser beam bundle suitable for high-brightness fiber-coupling.

The invention discloses a semiconductor laser. The semiconductor laser comprises a chip base, a first light-emitting component, a second light-emitting component, a first beam combining component, a focusing component and an insertion core, the first beam combining assembly is used for combining laser beams emitted by the first light emitting assembly and the second light emitting assembly, and the focusing assembly is used for focusing the laser beams combined by the first beam combining assembly and enabling the laser beams to enter the insertion core; wherein the first light-emitting assembly comprises a first light-emitting chip, a first collimating lens, a first slow axis collimating negative lens and a first slow axis collimating positive lens which are sequentially arranged in the second direction, and laser emitted by the first light-emitting chip is collimated in the fast axis direction and the slow axis direction through the first collimating lens; and then the light is collimated again in the slow axis direction through the first slow axis collimation negative lens and the first slow axis collimation positive lens and enters the first beam combining assembly. The light beam quality of the semiconductor laser can be improved.

A laser device comprises a plurality of laser diodes, each laser diode emitting a light beam having a fast axis and a slow axis and a beam direction; and one or more optical components configured to modify a divergence of the light beams in a fast axis plane and / or in a slow axis plane such that the light beams have a same focal plane in the fast axis plane and in the slow axis plane.

The invention provides a laser radar system, a control method and a control device. The laser radar system comprises a transmitting unit, a first scanning unit and a second scanning unit. And the two scanning units are arranged on the propagation path of the detection light beam emitted by the emitting unit. The first scanning unit performs slow axis scanning on the detection light beam through swinging; and the second scanning unit performs fast axis scanning on the detection light beam through continuous rotation. The scanning period of the second scanning unit comprises a first time period for carrying out idle scanning and a second time period for completing one quick scanning period in the object space. The first scanning unit rotates from one angular position to another angular position in the first time period, and keeps the angular position unchanged in the second time period. The embodiment of the invention can be used for a detection or sensing system of a new energy vehicle or an intelligent driving vehicle, and can improve the speed and distance measurement performance of the laser radar under the condition of adopting the scanning device.

The invention provides a high-precision decoupling method for multiple parameters of a long-distance optical fiber sensitive ring, and belongs to the technical field of optical measurement and optical fiber sensing. The method is characterized by comprising the following steps: testing fast axis signals and slow axis signals of an optical fiber sensitive ring before and after temperature change by using a polarization-maintaining OFDR; calculating a cross-correlation wavelength offset and a self-correlation wavelength offset; correcting position deviation and decoupling coefficient fluctuation; decoupling to obtain temperature and thermal strain distribution in the optical fiber sensitive ring; by using the strain and temperature calibration device of the tail fiber of the optical fiber sensitive ring, the correctness of the temperature and thermal strain decoupling result of the optical fiber sensitive ring is ensured. According to the method, high-precision (+ / -0.5 DEG C, + / -5 mu epsilon) testing of internal temperature and thermal strain distribution of the kilometer-level optical fiber sensitive ring under rapid temperature change can be realized, and the method can be used for multi-parameter detection and symmetry analysis of the optical fiber sensitive ring and performance forecasting and optimization of a gyroscope system.

The invention relates to a double-grating external cavity spectrum beam combining device. The device comprises a semiconductor laser array light source, a fast axis collimating mirror, a slow axis collimating mirror, an optical path compensation device, a diffraction grating pair, a collimating lens and an output coupling mirror which are arranged in sequence. The optical path compensation device comprises a plurality of optical path compensation assemblies, and the optical path compensation assemblies are in one-to-one correspondence with sub light beams in the array light beams. An optical path compensation assembly is installed in an independent optical path transmission path of each sub-beam of the array beam, the outer cavity length and the beam combining efficiency of each sub-beam are changed through the optical path compensation assemblies, and specifically, the optical path of each sub-beam can be increased through the design that a reflection assembly installation platform drives a reflection assembly to move upwards, so that the beam combining efficiency is improved. Therefore, the length of the outer cavity is increased, the beam combining efficiency is improved, and the stability and precision of the system can be improved. And finally, the cylindrical lens can compensate optical errors introduced in a light beam transmission process, so that each sub-light beam is ensured to have good wavefront uniformity and phase consistency.

The invention relates to the technical field of fiber bragg gratings, and particularly provides a birefringent FBG-based fiber environment event identification method, which comprises the following steps: constructing a spectral pulse matrix according to fast axis spectrums and slow axis spectrums of a plurality of spectral pulses, the spectral pulses being echo spectral pulses transmitted by a birefringent FBG; solving a joint optimization problem, and separating a first matrix and a second matrix from the spectral pulse matrix; solving a first optimization problem of the first matrix based on a first dictionary learning algorithm to obtain a vibration event recognition matrix used for representing a vibration event signal; and solving a second optimization problem based on a second dictionary learning algorithm to obtain a temperature offset feature vector used for representing the temperature change signal, the second optimization problem being determined according to the merged vector of the second matrix. The problem of difficulty in signal decoupling of the FBG in a complex environment in which temperature change and vibration events exist at the same time in the prior art is solved.

The invention relates to an electro-optical crystal half-wave voltage temperature correlation detection method and system. The system comprises a light source, a polarizer, an optical phase modulator, an isolation optical fiber, an electro-optical crystal to be detected and a polarization analyzer which are sequentially arranged along a light path. The included angle between the light transmitting direction of the polarizer and the fast axis direction of the optical phase modulator is 45 degrees; the included angle between the light transmitting direction of the polarization analyzer and the fast axis direction of the electro-optical crystal to be detected is 45 degrees; applying voltage to the optical phase modulator, wherein the voltage amplitude is 1 / 4 wavelength voltage of the optical phase modulator; constructing a light path inherent function; the environment temperature of the electro-optical crystal to be detected is changed, the intensity of output light at different temperatures is detected, the nearly 1 waveform variation is calculated according to the light intensity, and the correlation between the electro-optical coefficient of the electro-optical crystal to be detected and the temperature is judged according to the nearly 1 waveform variation.

The invention provides a semiconductor side pump module and a laser, and relates to the technical field of semiconductor lasers. The semiconductor side pump module comprises a light gathering cavity, a cooling pipe is coaxially arranged in a cavity body of the light gathering cavity, a crystal bar is coaxially arranged in the cooling pipe, and the cooling pipe and the crystal bar jointly form a cooling space used for containing cooling liquid. An odd number of pumping units are uniformly distributed on the outer side of the light condensing cavity along the circumferential direction; and each pumping unit comprises a plurality of pumping sources which are uniformly arranged along the axial direction. A slit allowing pump light to enter is formed in the light gathering cavity. And fast axis shaping negative lenses in one-to-one correspondence with the pumping units are arranged on the outer side of the cooling pipe in the cavity. The semiconductor side pump module and the laser provided by the invention can effectively improve the uniformity of light spots.

The invention discloses an optical scanning device which can be applied to the field of target detection and comprises a slow axis driving module, a fast axis galvanometer module, a driving detection module and a supporting module. A fast-axis driving magnet used for driving a fast-axis galvanometer module is fixed on a supporting module, and only the fast-axis galvanometer module is connected with a slow-axis driving module, so that the slow-axis driving module only needs to drive the fast-axis galvanometer module to move in the slow-axis direction, and does not need to drive the fast-axis driving magnet to move together; therefore, the load of the slow-axis driving module is reduced, the power consumption of the optical scanning device is effectively reduced, the response speed of the fast-axis galvanometer module moving in the slow-axis direction is improved, and the performance of the optical scanning device is ensured.

An optical coherence tomography analysis apparatus includes: an acquisition unit that performs optical coherence tomography by applying a light beam, and that acquires three-dimensional luminance data about the skin; a position extraction unit that extracts an epidermis position, for each tomography image obtained by scanning in a fast axis direction of the light beam, in the three-dimensional luminance data about the skin; a connection unit that generates connected three-dimensional data, by adjusting relative positions between tomography images and connecting the tomography images, on the basis of an extraction result of the epidermis position; a flattening unit that generates flattened three-dimensional data, by performing transformation processing of flattening epidermis on the connected three-dimensional data, on the basis of an extraction result of the epidermis position; and a pattern extraction unit that extracts a pattern of the skin corresponding to a predetermined extraction depth, from the flattened three-dimensional data.

A flow cytometer of a blood analyzer including a transverse-electric (TE) laser diode, a flow cell, a quarter wave plate (QWP), a plurality of lenses, and a side scatter detector. The TE laser diode is configured to output a laser beam along an optical axis and has a fast axis full width at half maximum (FWHM) divergence of from about 16 degrees to about 25 degrees. The QWP is disposed along the optical axis between the TE laser diode and the flow cell and configured to circularly polarize the laser beam. The plurality of lenses is disposed between the TE laser diode and the flow cell and configured to focus the laser beam at the flow cell.

An optical system including one or more optical lenses, at least one retarder layer, a reflective polarizer, and a partial reflector is provided. The at least one retarder layer may include first and second retarder layers having different wavelength dispersion curves. The at least one retarder layer may include a first retarder layer having a non-uniform fast axis orientation and / or a non-uniform retardance.

The invention relates to the technical field of light beam collimation measurement, and discloses an array laser light beam collimation measurement method, device and equipment and a storage medium, and the method comprises the steps: obtaining a light spot image and overall light spot distribution of each array in an array laser, carrying out the cutting of the light spot image based on a light beam bounding box of the light spot image, and obtaining a light beam bounding box of the light spot image; obtaining a pixel value in a light beam bounding box on the light spot image, taking the pixel value as a target image, determining a light spot center position according to a fast axis center and a slow axis center of each target image, and obtaining a light spot image based on the overall light spot distribution diagram, the overall bounding box of the overall light spot distribution diagram, the light spot center position and a preset standard distribution radius. And determining the positions of the offset array elements and the distribution center of the light spots. According to the method, the light spot center position of each light spot image is found through the light spot images, and then the position condition of the deviated array element is determined according to the overall light spot distribution diagram and the light spot distribution center, so that the deviated array element is quickly found, and the subsequent adjustment of the array machine laser is facilitated.

The invention provides an automatic coupling device for a fast-axis beam of a micro-channel laser stack array, and relates to the technical field of semiconductor lasers. The device comprises an optical platform, and the optical platform is provided with a stack array adjusting subassembly, a power-up subassembly, a UV curing subassembly, a lens adjusting subassembly, a dispensing subassembly, a near-field detection subassembly and a far-field detection subassembly. The stack array adjusting part is used for installing the stack array, and the power-up part is used for powering up the stack array. And the UV curing subassembly is used for curing the ultraviolet glue. And the lens adjusting subassembly and the dispensing subassembly are respectively used for adjusting the position of the fast axis collimating lens and dispensing. The SAC lens is arranged on a sliding plate of the dispensing subassembly through a fixing rod, during coupling, laser emitted by the micro-channel laser sequentially passes through the fast axis collimating lens and the SAC lens and then is divided into a far-field light beam and a near-field light beam by the beam splitter prism, the near-field light beam enters the near-field detection subassembly, and the far-field light beam enters the far-field detection subassembly. The device effectively solves the problems of low production efficiency, poor coupling precision and the like in the existing coupling mode.

The present application relates to a scanning device of a laser radar and a method for optimizing the structure of the scanning device. The scanning device includes a substrate, a scanning mirror, a driving ring, a fast axis and a slow axis; at least one of the fast axis and the slow axis is a stress equalization structure, and the stress equalization structure includes a single-axis structure or a dual-axis structure. A driving hole is provided on the substrate, the scanning mirror is connected to the driving ring through the fast axis, the driving ring is connected to the substrate through the slow axis, and the scanning mirror is arranged at the center of the driving ring, which is arranged at the center of the driving hole. The above-mentioned device optimizes the structure of the traditional fast axis or slow axis into a stress equalization structure, so that the deformation mode of the fast axis or slow axis is transformed from a torsional mode to a bending mode, thereby reducing the stress magnitude in the stress concentration area during the cyclic motion process, and keeping the stress away from the fatigue failure stress threshold, thereby greatly improving the durability of the non-silicon scanning mirror and thereby improving the working life of the device.

The application provides a laser etching device and method for large-format and large-size samples, and aims to solve the technical problem that the laser processing mode of linkage of the fast axis and the slow axis of the existing galvanometer causes the non-uniform processing speed of different pattern segments due to the speed difference of the fast axis and the slow axis, and forms the splicing trace with inconsistent response speed when facing complex filled patterns. The laser etching method for large-format and large-size samples provided by the application is realized by the laser etching device for large-format and large-size samples composed of a laser scanning part, a sample movement part, a bracket and a controller, and the method of combining "trajectory decomposition + multi-layer filling" is adopted to realize the laser etching processing without splicing traces, thereby avoiding the splicing trace problem caused by the inconsistent speed response of the traditional linkage system of the fast axis and the slow axis, and ensuring the reliability and consistency of the large-area etching processing.

The invention belongs to the technical field of fiber-optic gyroscopes, and particularly relates to an acceleration-based fiber-optic gyroscope vibration error compensation method and an inertial measurement unit. Based on normal strain, optical fiber dielectric impermeability tensor variable quantity, refractive index variable quantity of light in the fast axis direction and phase variable quantity corresponding to a sensitive axis of an optical fiber gyroscope, quantitative relations between the phase variable quantity and the fast axis direction of the optical fiber and between the phase variable quantity and the length of a micro-section optical fiber are established, and the equivalent value of the stress borne by the optical fiber and the phase difference of an optical fiber ring is obtained; the linear relation between the phase difference equivalent value and the angular velocity to be compensated of the fiber-optic gyroscope is determined, the relation of converting the vibration acceleration to the phase to be compensated is established, and the required compensation coefficient is calibrated by combining a sinusoidal vibration test to compensate the vibration error of the fiber-optic gyroscope. According to the invention, vibration error compensation of the fiber-optic gyroscope can be realized without adding extra devices, and the real-time performance and accuracy of error compensation are improved.

The invention relates to the technical field of image recognition and search, and discloses a surveying and mapping device capable of automatically searching a target, which comprises a base, surveying and mapping equipment is arranged at the top of the base, a searching mechanism is arranged at the top of the surveying and mapping equipment, the searching mechanism comprises a supporting block, and the supporting block is fixedly connected to the front side of the top of the surveying and mapping equipment. A semiconductor laser is installed on the left side of the supporting block, an emission lens is fixedly connected to the right side of the supporting block, and a fixing plate is fixedly connected to the right side of the top of the surveying and mapping device. According to the invention, the transmitting lens is matched with the transmitting cylindrical mirror, an elliptical Gaussian beam emitted by the semiconductor laser is converted into a fan-shaped line light source with uniform energy distribution by adopting a means of combining slow axis collimation and fast axis beam expansion, and a specified search angle is covered; the problems of non-uniform divergence of the infrared light source in the vertical direction and low light energy utilization rate in the prior art are avoided.

The invention discloses an OLED display screen assembly, a streaming media rearview mirror and a processing method.The OLED display screen assembly comprises a base material, an OLED display screen body and a reflective polarizer which are sequentially arranged from inside to outside in the stacking direction; the OLED display screen body comprises an anode layer arranged close to the base material, a cathode layer arranged close to the reflective polaroid and a light-emitting layer arranged between the anode layer and the cathode layer. A 1 / 2 wave plate is arranged on the side, close to the light-emitting layer, of the anode layer, and efficient polarization conversion and recycling of S light reflected by the reflective polaroid can be achieved. When the reflected S light penetrates through the 1 / 2 wave plate twice, the polarization state of the S light is rotated by 90 degrees through the 45-degree fast axis design to be converted into P light, the P light is transmitted in the forward direction after being reflected by the anode layer and finally penetrates through the reflective polaroid, the problem that the S light is repeatedly reflected and absorbed by the reflective polaroid in a traditional framework is solved, the transmittance of visible light on the reflective polaroid is effectively improved, and the service life of the S light is prolonged. And the display brightness of the streaming media rearview mirror is obviously enhanced.

The invention discloses a transmitting module, a detection device and terminal equipment, relates to the technical field of radars, and is used for improving the structural design freedom degree of the transmitting module. Wherein the emission module comprises a light source assembly, a reflection assembly, a shaping assembly and a circuit board, the light source assembly and the reflection assembly are arranged on the circuit board, the light source assembly comprises an EEL, the light source assembly is used for emitting a first light beam, and the reflection assembly is used for reflecting the first light beam to obtain a second light beam; the shaping assembly is used for shaping the second light beam in the fast axis direction and the slow axis direction. According to the scheme, the EEL is arranged at the non-edge position of the circuit board, the shaping assembly can also be matched with the reflection assembly to be arranged above the circuit board, and the structural design freedom degree of the emission module can be effectively improved. In addition, due to the fact that the EELs are not limited by being placed on the edge of the circuit board, the multiple EELs can be arranged on the same circuit board, it is not needed to independently arrange one circuit board for each EEL, and therefore the cost and the size of the emission module can be effectively saved.

This application discloses a method and related apparatus for obtaining a phase retardation map and a fast axis orientation map of the cornea. The method includes inputting a preset polarization state into a metasurface polarization analyzer to obtain polarization measurement data output by the metasurface polarization analyzer; solving for polarization state matrix parameters based on the polarization measurement data; and decomposing the polarization state matrix parameters to obtain a phase retardation map and a fast axis orientation map of the cornea. Using this application embodiment, subtle microstructural changes in the cornea can be captured with high sensitivity, compensating for the lack of quantitative analysis methods in traditional slit-lamp examinations, while effectively overcoming the problem of insufficient accessibility caused by the large size and high cost of traditional high-end detection equipment.

The invention provides a laser etching device and method for a large-breadth large-size sample, which are used for solving the problems that when an existing galvanometer axis and motion axis linkage laser processing mode faces a complex filled pattern, due to the response speed difference of a fast axis and a slow axis, the processing speed of different pattern sections is not uniform, and the processing efficiency is low. And splicing traces with inconsistent response speeds are formed. According to the laser etching method for the large-breadth and large-size sample provided by the invention, the laser etching device for the large-breadth and large-size sample is composed of a laser scanning part, a sample moving part, a bracket and a controller, and laser etching processing without splicing traces is realized by adopting a method of combining'track decomposition and multilayer filling '; the problem of splicing traces caused by inconsistent speed response brought by a traditional fast and slow axis linkage system is avoided, and the reliability and consistency of large-area etching processing are guaranteed.