54 results about "Beam polarization" patented technology

A 3D printing device includes a light control module, a light source module, and a receiving slot. The light source module provides a light beam to the light control module. The receiving slot receives a photo-curing material. The light control module is between the light source module and the receiving slot. The photo-curing material is cured by the light beam. The light control module includes first and second substrates, a dielectric layer, and a polarizing element. The first substrate has outer and inner surfaces opposite to each other. The second substrate is opposite to the first substrate. The dielectric layer is between the inner surface of the first substrate and the second substrate. The polarizing element is on the outer surface of the first substrate. A polarization degree of the polarizing element for a light beam having a wavelength range of 375 nm to 405 nm is 98% to 100%.

The invention relates to the technical field of microscopic imaging, and particularly provides a stimulated Raman scattering microscopic imaging system capable of simultaneously scanning double Raman frequency shift spectrums, which comprises a laser light source driving and modulating unit and a signal detecting and data processing unit, the laser light source driving and modulating unit comprises a dual-channel laser synchronous excitation module, a light beam polarization regulation and power distribution module, a pulse broadening and spectrum focusing module, a dual-channel dual-phase modulation module, a common-path different-time dual-frequency difference module and a laser scanning and telecentric focusing module; and the signal detection and data processing unit comprises a dual-channel orthogonal demodulation module and a scanning driving and signal synchronous acquisition module. Compared with the prior art, the dual-Raman frequency shift spectrum scanning stimulated Raman microimaging device has the advantages that dual-Raman frequency shift spectrum scanning stimulated Raman microimaging with higher acquisition speed, high resolution and wide spectrum coverage range is realized, and the problem of long time consumption for acquiring the complete spectrum of the to-be-tested sample by the traditional single-frequency resonance spectrum scanning stimulated Raman microimaging is solved.

The application belongs to the technical field of optical switching, and particularly relates to an LCOS-based OCS optical switch, which comprises a collimating and polarizing module, a first LCOS, an achromatic Fourier transform lens group and a second LCOS. The collimating and polarizing module collimates, separates and converts a first light beam to obtain a first group of P light beams containing two P light beams. The first LCOS modulates and deflects the first group of P light beams to obtain a second group of P light beams containing a plurality of P light beams emitted at different deflection angles. The achromatic Fourier transform lens group deflects and transforms the waist of the second group of P light beams to obtain a third group of P light beams. The second LCOS modulates and deflects the third group of P light beams to obtain a fourth group of P light beams containing a plurality of P light beams emitted at the same deflection angle. The polarizing and focusing module converts, combines and focuses the fourth group of P light beams into a second light beam composed of S light and P light. The first light beam enters the OCS input port, and the second light beam is output from the OCS output port, so as to realize an optical switching technical scheme which is less affected by external vibration, has good stability and low implementation cost.

This application provides a radar system and a target detection method. The radar system provided includes a beam transmission control component, a polarization angle modulator, an antenna array with adjustable linear polarization, a signal receiving and processing unit, and a computer. The beam transmission control component generates a transmitted signal. The polarization angle modulator modulates the transmitted signal according to the beam polarization angle indicated by the computer. The computer determines the beam polarization angle for each modulation cycle, and based on the beam polarization angle corresponding to each modulation cycle and the processing information corresponding to that modulation cycle, determines the polarization response characteristics of the target, and detects the target based on the target polarization response characteristics during target detection and tracking. The radar system and target detection method provided in this application can improve the signal-to-noise ratio, identification capability, and anti-interference ability of the radar system for detecting small, slow-moving targets.

The application discloses a phase screen-based array photonic orbital angular momentum beam quantum control system, and belongs to the technical field of quantum control.The application is used for solving the problem of mutual overlapping and interference among sub-beams of an array photonic orbital angular momentum beam.The application comprises a laser, a beam shaping unit, a polarization control unit and a quantum state control unit;the beam shaping unit is used for spatially filtering and expanding a laser beam generated by the laser to generate parallel light beams;the polarization control unit is used for performing polarization control on the parallel light beams output by the beam shaping unit to generate linearly polarized light beams with horizontal polarization states;the quantum state control unit is used for performing array photonic orbital angular momentum control on the linearly polarized light beams to obtain array photonic orbital angular momentum light beams, and each sub-beam in the array is independent;and the application can be used for generating array photonic orbital angular momentum light beams with independent sub-beams through a compact optical path.

The invention discloses a blue light coherent tuning locking narrow linewidth output system, and belongs to the technical field of blue light semiconductor laser. The output system comprises a space beam combining module and a double-external-cavity tuning locking module. The space beam combining module outputs a blue light beam; the double-external-cavity tuning locking module comprises an adjustable wave plate, a polarization splitting prism, a first external cavity and a second external cavity; the adjustable wave plate changes the polarization state of the blue light beam, and the proportion of the mixed polarized light beam is adjustable; the polarization splitting prism separates P polarized light and S polarized light in the mixed polarized light beam; the first outer cavity processes the S polarized light and then returns the S polarized light to the space beam combining module according to an original light path, so that the wavelength is locked and the line width is compressed; the second outer cavity outputs one part of the P polarized light, and the other part of the P polarized light returns to the space beam combining module according to an original light path after being processed; the receiver receives P polarized light fed back in the second outer cavity and transmits the P polarized light to the upper computer, and spectral parameters of feedback light beams are obtained. And relatively high beam quality and laser power are realized.

The present invention discloses a three-port reflective optical circulator based on a birefringent crystal, belonging to the field of optical communications. The three-port reflective optical circulator comprises a first birefringent crystal, a half-wave plate assembly, a roof prism, a Faraday rotator crystal, a second birefringent crystal, a quarter-wave plate, and a reflector, which are arranged in sequence. The first port, the second port, and the third port are respectively located on a side of the first birefringent crystal away from the half-wave plate assembly. The birefringent crystal performs light splitting to split a light beam into two sub-beams, o-polarized light and e-polarized light, with mutually perpendicular polarization directions. The polarization directions of the sub-beams are controlled by the half-wave plate, the quarter-wave plate, and the Faraday rotator crystal. Finally, the birefringent crystal performs light combining, thus realizing the functions of the optical circulator with input at the first port and output at the second port, and with input at the second port and output at the third port. The three ports are located on the same side of the optical circulator, making it easier to arrange other components and miniaturizing the optical circulator.

The application provides an N+1 laser interference lithography system, comprising: a light source module, which controls the exposure dose of a laser beam emitted by a laser by using an electrically controlled clock valve device, and controls the laser beam to be incident to a rotating light splitting module at 45°; the rotating light splitting module splits the amplitude of the laser beam to obtain N+1 coherent beams with similar energy, and modulates the spatial position of N edge coherent beams; a beam arm, which is used for controlling a 1 center coherent beam to be directly incident to a sample table capable of rotating by 360° and moving in three dimensions, and respectively controlling N edge coherent beams to be incident to the sample table from the same side or different sides at a specified incident angle with the 1 center coherent beam; and the sample table, which is placed with a substrate material, and a double-sided periodic or three-dimensional periodic micro-nano structure is prepared by converging the N+1 coherent beams. The system can flexibly control the light splitting ratio, the beam polarization state, the interference angle and the number of participating beams to obtain periodic structures with more parameters and pattern changes.

The invention relates to an optical device (10) for changing the polarisation (12) of a polarised light beam (14). The optical device (10) has a beam input (16) for the polarised light beam (14), which can enter the beam input (16) of the optical device (10) along a first propagation axis (18), and a beam output (20) for the polarised light beam (14), which can exit the beam output (20) of the optical device (10) along a second propagation axis (22). Furthermore, the optical device (10) has a plurality of deflecting elements (24), each of which is designed to deflect the polarised light beam (14) within the optical device (10), wherein at least one of said deflecting elements (24) is designed to change at least one polarisation component of the polarised light beam (14). The optical device (10) also has a beam path (26), which is formed within the optical device (10) by means of the deflecting elements (24) starting from the beam input (16) to the beam output (20) of the optical device (10). According to the invention, the deflecting elements (24) are arranged in such a way that they can be rotated together about an axis of rotation (28). Furthermore, according to the invention, the first propagation axis (18), the second propagation axis (22) and the axis of rotation (28) are parallel to one another.

The invention relates to the technical field of LED epitaxial wafers, in particular to an LED epitaxial wafer, a preparation method of the LED epitaxial wafer and an LED chip, and the method comprises the following steps: firstly, carrying out cleaning and hydrofluoric acid etching treatment on a sapphire substrate, and growing a Sn-doped Li5GaO8 buffer layer through pulse laser deposition; then growing an n-type GaN layer through a chemical vapor deposition method, preparing a ZnGa2O4 seed layer through pulsed laser deposition, forming an InGaN quantum dot array through strain induced phase separation, then constructing a gradient In component quantum well, depositing a BaTiO3 ferroelectric layer through magnetron sputtering, and neutralizing a built-in electric field through electron beam polarization; and finally, growing a gradient doped p-type GaN layer by adopting a circulating annealing process, and assembling a KZnPO4 nanosheet ordered array on the surface of the gradient doped p-type GaN layer by adopting a vertical pulling technology. Therefore, the problems of poor heat dissipation, low luminous efficiency, high efficiency attenuation, short service life and the like of the LED epitaxial wafer are solved.

The present disclosure relates to the technical field of holographic optical waveguide, and provides a holographic grating preparation system and a preparation method. The holographic grating preparation system comprises: a laser light source for generating a laser beam; a polarization light splitting component for splitting the laser beam into two beams and adjusting the light intensity and the beam polarization direction of the split laser beams, so that the polarization directions of the two split laser beams are perpendicular to the horizontal plane and parallel to the rotation axis of the mirror; a mirror group for mirror reflecting the split laser beams output by the polarization light splitting component to form two intersecting laser beams with a set angle, and the set angle is adjusted according to the rotation angle of the mirror group; and a recording medium for receiving the two intersecting laser beams, recording the interference fringes of the two intersecting laser beams through the refractive index and / or transmittance changes varying with the two intersecting laser beams, and forming a holographic grating.

The invention relates to the technical field of optical detection, in particular to a light beam polarization dynamic analysis device based on a metasurface. The device comprises a polarization analysis function unit array, and each function unit is composed of four subunits: a left-handed rotation light detection unit, a right-handed rotation light detection unit, a vertical line polarization detection unit and a horizontal line polarization detection unit. Synchronous detection of a pair of orthogonal circular polarized light and a pair of orthogonal line polarized light is realized based on a chiral sub-wavelength micro-nano structure and a sub-wavelength cuboid structure respectively. The device can be pasted or directly processed on a camera target surface, and global polarization analysis is realized through area array arrangement. The invention solves the problems of complex system and poor environmental adaptability of the existing polarization phase-shifting interference measurement technology, has the advantages of simplified structure, high detection precision, strong environmental robustness and the like, and is suitable for dynamic optical surface shape detection application.

The application provides a method and system for simultaneously measuring transverse vibration and angular jitter of a Hermite-Gaussian beam, comprising: expanding a Gaussian light source, and modulating a phase diagram corresponding to the Hermite-Gaussian beam on a spatial light modulator; passing the Hermite-Gaussian beam through a pre-selection, separating horizontal polarization components and vertical polarization components of the beam, perceiving vibration and jitter of a perception unit, and converting the transverse vibration and jitter, and passing the polarization state of the beam through a post-selection; and making the beam incident on the spatial light modulator, modulating a phase diagram corresponding to a projection measurement base for transverse vibration signals and angular jitter signals, converting the projection measurement transverse vibration and angular jitter signals into light intensity information, measuring the light intensity and converting it into a voltage signal, and inputting the voltage signal into a spectrum analyzer to demodulate amplitudes and frequencies of the transverse vibration signals and the angular jitter signals.

The invention provides an (N + 1)-beam laser interference photoetching system, which comprises a light source module for controlling the exposure dose of a laser beam emitted by a laser by using an electric control clock valve device and controlling the exposure dose to enter a rotary light splitting module at 45 degrees; the rotary light splitting module is used for carrying out amplitude division light splitting on the laser beams to obtain N + 1 coherent light beams with similar energy, and modulating the spatial positions of the N edge coherent light beams; the light beam arm is used for controlling one central coherent light beam to directly enter a sample table which can rotate by 360 degrees and move in a three-dimensional manner; and respectively controlling the N edge coherent light beams and the central coherent light beam to be incident to the sample table from the same side or different sides at a specified incident angle, a substrate material is placed on the sample table, and the N + 1 coherent light beams are converged, so that the double-sided periodic or three-dimensional periodic micro-nano three-dimensional structure is prepared. The system can flexibly regulate and control the splitting ratio, the light beam polarization state, the interference angle and the number of participating light beams so as to obtain a periodic structure with more parameters and pattern changes.

The invention provides a reflective bidirectional light-passing magneto-optical switch, which relates to the technical field of optical communication and comprises an optical fiber collimation coupling unit, a polarization beam splitting and combining unit, a polarization state regulation and control unit, a reflection unit and a magnetic field generation and control unit which are sequentially arranged along an optical path. The 45-degree half-wave plate and the Faraday optical rotation crystal are configured to regulate and control light beam polarization, and it is ensured that optical signals are accurately guided to the output end after passing through the birefringent crystal. According to the design, the input port and the output port are integrated on the same side, compared with a transmission type structure, the magneto-optical switch has the advantages of being small in size, high in material utilization rate and compact in layout, the flexibility and adaptability of the magneto-optical switch are remarkably improved, bidirectional reversible transmission of an optical path is achieved, and the application requirement for bidirectional information interaction between channels is met.

The application provides a kind of classical entanglement-based optical beam axial rotation measurement method and system, comprising: after single-frequency laser light source is expanded, the phase diagram corresponding to Hermite-Gaussian light beam is modulated, and higher purity Hermite-Gaussian light source is generated after filtering system;The horizontal component and vertical component of the polarization state of the light beam are introduced by pre-selection, and the axial rotation in opposite directions is introduced, and then the polarization state of the light beam is passed through post-selection, so that the optical beam axial rotation parameter is carried by spatial mode entanglement state;The phase diagram corresponding to the mode entanglement state carrying parameter of the light beam after post-selection is modulated, Fourier lens is passed through, and fiber tail fiber is used for receiving;Projection measurement converts optical beam axial rotation parameter into light intensity information, measures the light intensity obtained by projection measurement, converts into electrical signal and inputs into spectrum analyzer, and demodulates the size of optical beam axial rotation.The application has higher measurement accuracy compared with the existing optical beam axial rotation measurement scheme.

The invention discloses a laser amplifier and a method for avoiding thermal depolarization of a side pump. According to an exemplary embodiment, a laser amplifier comprises: a vector polarization conversion device for converting linearly polarized light into light in a single vector polarization state; and a side pump module for amplifying the light incident on the side pump module. According to the technical scheme provided by the invention, only one vector polarization component exists in the module through the polarization conversion device, and thermal depolarization does not occur in single radial or angular vector polarization under cylindrical symmetric anisotropic refractive index distribution, so that thermal depolarization does not occur no matter whether a light beam passes through a crystal rod for one time or multiple times, and therefore, the reliability of the module is improved. Therefore, the influence of the thermal depolarization effect of the side pump module on the polarization state of the light beam is reduced, and the amplification quality of the high-energy picosecond laser and the stability of an amplification system are improved.

There are disclosed systems for generating super-polarized electromagnetic radiation comprising a source providing a source beam of electromagnetic radiation, a beam splitter having a selected transmission-reflection coefficient ratio, a rotator that provides equivalence to an orthogonal rotation of modes, a two-channel polarizer having polarization axes orthogonal to each other, and a means for directing the two beams from the beam splitter to the corresponding inputs of the two-channel polarizer, wherein the first beam polarization axis is in axial alignment with the first input polarization axis of the two-channel polarizer and orthogonal to the second input polarization axis of the polarizer, wherein the rotator is positioned in the second beam to provide equivalence to an orthogonal rotation of modes on the second beam, wherein the paths traveled by the first beam the second beam are equal, and wherein the output beams combine to form an output beam including super-polarized modes.

The invention relates to the technical field of optical measurement, and provides a cholesteric liquid crystal refractive index measurement method, device and equipment and a medium. According to the method, when a target polarization grating is in an abnormal diffraction state, incident parameters of an incident beam and emergent parameters of an emergent beam are collected; and the actual optical characteristics of the cholesteric liquid crystal are directly reflected in the measurement process. A Mueller matrix is constructed on the basis of incident parameters and emergent parameters, polarization state changes of light beams are described, the influence of cholesteric liquid crystal molecule arrangement on the light polarization state is more accurately captured, and measurement errors caused by optical property differences are reduced. Ellipsometry parameters are calculated through a Mueller matrix, and key features of light beam polarization state changes are further extracted. According to the method, the ellipsometry parameters are analyzed through the parameter fitting model, the refractive index of the target polarization grating is directly generated, measurement errors caused by structural differences in related technologies are avoided, and therefore the accuracy and reliability of measurement results are remarkably improved.

The application discloses a kind of laser pump sources, including base, and first light emitting unit, second light emitting unit, beam combination unit and coupling unit are arranged on base;First light emitting unit and / or second light emitting unit are obliquely arranged in the direction of emitting light beam, so that the light outlet of first light emitting unit and the light outlet of second light emitting unit are located at different heights, and the optical path of obliquely arranged first light emitting unit and / or second light emitting unit is provided with a pressure light reflector, and the pressure light reflector is used to press the oblique light emitted by first light emitting unit and / or second light emitting unit into horizontal light;Beam combination unit is used for polarized beam combination of light beam emitted by first light emitting unit and second light emitting unit, and coupling unit is used for coupling the light beam after polarization beam combination into optical fiber.The laser pump source of the application not only has compact structure, but also has lower spectral width.

The disclosure provides an optical device, including: a light source, used to emit a beam; a polarizing beam splitting layer, located on an optical path of the beam and splitting the beam into a first beam and a second beam, wherein the first beam passes through the polarizing beam splitting layer, the second beam is reflected by the polarizing beam splitting layer, the first beam has a first polarization direction, and the second beam has a second polarization direction perpendicular to the first polarization direction; a phase retardation element, located on an optical path of the second beam, wherein the second beam passes through the phase retardation element at least once to become a third beam with the first polarization direction; a lens, located on the optical paths of the first beam and the third beam, wherein the first beam and the third beam respectively pass through the lens.

The invention provides a digital holographic speckle suppression imaging system based on a rotary spherical lens, and belongs to the technical field of digital holographic speckle suppression imaging systems. In order to solve the technical problems of complex light path structure, low imaging quality and high manufacturing cost of a laser modulation element in the existing speckle noise suppression, the adopted technical scheme is as follows: a laser beam emitted by a laser device is modulated by a filter and modulated by a first half-wave plate in intensity and polarization state; the incident light is modulated by the rotating ball lens, filtered by the diaphragm, and finally divided into an object beam and a reference beam by the polarization splitting prism; the object light beam is reflected by the first reflector to irradiate a sample object and is reflected back to the beam splitter prism; after the reference beam is reflected by the second reflector, the polarization state of the reference beam is consistent with that of the object beam through the second half-wave plate, and the reference beam is interfered at the CCD camera after being combined by the beam splitter prism to form an interference pattern; the method is used for suppressing the speckle noise of the digital holographic imaging system.

Laser processing device (1) for processing semiconductor wafers as workpieces, comprising: a first laser mechanism (1a) comprising a first clamping table (36) for holding a first workpiece, a first X-movement means (37) for moving the first clamping table (36) in an X direction, a first Y-movement means (38) for moving the first clamping table (36) in a Y direction perpendicular to the X direction, and a first focusing means (51) for focusing a first laser beam (LB1) on the first workpiece held on the first clamping table (36); a second laser mechanism (1b) comprising a second clamping table (36') for holding a second workpiece, a second X-movement means (37') for moving the second clamping table in the X direction, a second Y-movement means (38') for moving the second clamping table (36') in the Y direction, and a second focusing means (51') for focusing a second laser beam (LB2) on the second workpiece held on the second clamping table (36'); a laser oscillator for oscillating an original laser beam; an optical system for splitting the original laser beam oscillated by the laser oscillator and guiding the first (LB1) and second laser beams (LB2) respectively to the first (51) and second focusing means (51'); a first control panel (202) for setting a first processing condition for the first laser mechanism (1a); and a second control panel (205) for setting a second processing condition for the second laser mechanism (1b), wherein the first control panel (202) is attached to the laser processing device (1) at a different position than the second control panel (205), wherein the optical system (5) also includes a half-wave plate (53) and a polarization beam splitter (54), the half-wave plate (53) being inserted between the laser oscillator and the polarization beam splitter (54), By rotating the half-wave plate in the original laser beam, the intensity ratio between the first laser beam (LB1) as S-polarized light and the second laser beam (LB2) as P-polarized light, which are emitted by the polarization beam splitter (54), is continuously variable, and In the optical system, a setting agent (57) for a first wavelength and a setting agent (61) for a second wavelength are provided in an optical path of the first laser beam (LB1) and the second laser beam (LB2), which have passed through a first damper (56) and a second damper (60).

The invention provides a stripe period measurement-based alcohol concentration real-time measurement method, which comprises the following steps of: emitting a laser beam through a laser, adjusting components of s polarized light and p polarized light of the laser beam by a first half-wave plate, and dividing the laser beam into the s polarized light and the p polarized light by a polarization beam splitter prism; the p polarized light is transmitted by the polarization beam splitter prism and enters the second half-wave plate, and the second half-wave plate converts the p polarized light into s polarized light and then enters the sample flow cell; the s polarized light is refracted by the polarization beam splitter prism, enters the prism, is totally reflected for three times by the prism and then is irradiated to the sample flow cell; a solution to be detected is contained in the sample flow cell, the two beams of s polarized light intersect in the solution to form interference fringes, and the interference fringes are recorded through an image sensor; the refractive index and the concentration change of the solution are inversed by measuring the interference fringe period.

The application discloses a cross-polarization cancellation high-polarization-purity beam forming method based on a rotating auxiliary array, belongs to the technical field of array antennas, and aims to solve the problems of low array antenna beam polarization purity, complex cross-polarization suppression algorithm and cross-polarization deterioration in large-angle scanning. The method is applied to an array antenna containing a main array plane and an auxiliary array plane, first, the cross-polarization of the central unit of the main array, the main polarization pattern value is taken as a reference, the total number of main array units is combined to calculate the main array cross-polarization field amplitude and determine the number of auxiliary units; then, the auxiliary array plane is arranged on the side of the main array, and the auxiliary array unit is 90 DEG polarized rotation relative to the main array unit; finally, the auxiliary array unit excitation amplitude is calculated, and the main beam pointing phase is matched, so that the cross-polarization field amplitudes of the two are the same, the phases are opposite, and the high-polarization-purity main beam is formed by superposition. The application has low cost, strong engineering realizability, good compatibility and adaptability to large-angle scanning, and is suitable for fields such as radars and communications.

The embodiment of the invention provides an AR optical machine system and AR optical display equipment. The AR ray machine system comprises an illumination module, a polarization beam splitter, a first LCOS panel, a second LCOS panel and a projection lens. The polarization beam splitter is arranged in an emergent light path of the illumination module and is used for separating the natural light into first linearly polarized light and second linearly polarized light according to a polarization state and enabling the first linearly polarized light to be propagated along a first light path and the second linearly polarized light to be propagated along a second light path; the first LCOS panel is arranged on the first light path and is used for receiving and modulating the first linearly polarized light to form a first image light beam; the second LCOS panel is arranged on the second light path and is used for receiving and modulating the second linearly polarized light to form a second image light beam; the polarization beam splitter is also used for combining the first image light beam and the second image light beam to output a superposed image light beam; and the projection lens is positioned on the emergent side of the polarization beam splitter and is used for receiving the superposed image light beams and projecting and imaging.

The application discloses a fiber coupling system based on synchronous fast-axis compression and slow-axis self-polarization prism, comprising a plurality of groups of semiconductor laser stacks composed of a plurality of bars; the output of each bar in each group of semiconductor laser stacks is collimated by a fast-axis collimating lens and a slow-axis collimating lens, then is incident on a synchronous fast-axis compression and slow-axis self-polarization prism through a half-wave plate arranged along the slow-axis direction of the beam half-width, so that the light beam is offset in the fast-axis direction and is polarized and combined with the light beam in the slow-axis direction after the light beam in the slow-axis direction is polarized and combined, and the light of each adjacent two bars is offset in the fast-axis direction and is close to each other; the emergent light beam of the prism is compressed and filled by a beam compression and filling prism, then is combined by a wavelength combining mirror, and is focused and coupled into a target optical fiber by an aspheric lens. The application can offset and compress the dark area of the light beam in the fast-axis direction, and combines the polarization and combining technology, so that the light beam in the slow-axis direction is polarized and combined, and the uniform light beam quality is achieved.

The invention belongs to the technical field of synthetic aperture radars, and discloses an error transfer model suitable for multi-beam polarization InSAR height measurement. According to the method, a multi-beam polarization InSAR three-dimensional positioning expansion equation is obtained based on a multi-channel frequency spectrum reconstruction equation; combing error factors of multi-beam polarization InSAR height measurement, and constructing an error transfer model; further analyzing the directly introduced phase error and the inter-channel phase error to obtain an error transfer matrix; obtaining a reconstructed phase error and a slope distance error, and finally calculating to obtain an elevation error. By establishing a novel signal processing equation, multi-beam spectrum ambiguity introduced by complex measurement geometry can be accurately compensated, the data quality and applicability of multi-platform and multi-beam cooperative surveying and mapping are remarkably improved, and the method is particularly suitable for refined surveying and mapping of complex terrain areas; according to the invention, the precision and reliability of multi-beam polarization InSAR height measurement are greatly improved.

The invention discloses a phase and polarization state controllable ultraviolet vector structure light beam generator design method and a light beam generator, and belongs to the field of nanometer photonics. According to the invention, an ultraviolet low-loss wide-band-gap oxide material is selected, so that the problem of loss of a traditional material in an ultraviolet waveband is solved; by selecting anisotropic nano-columns and adopting cooperative regulation and control of geometric phase and propagation phase, the designed generator can realize independent regulation and control of incident light polarization state and phase, thereby realizing generation of ultraviolet vector structure light beams with any topological charge number, polarization order number and radial index. The generator has a polarization multiplexing function, and flexible switching of radial and angular polarization state output beams can be realized only by adjusting the polarization state of an incident beam. The invention not only breaks through the technical bottleneck of ultraviolet band structured light generation, but also provides a new technical approach for applications such as ultraviolet precise imaging, biomolecular sensing, integrated optical communication and the like due to the compact chip-level design scheme and the multifunctional regulation and control capability.

This application belongs to the field of optical measurement and discloses a method and apparatus for joint detection of polarization and wavelength based on beam spin separation. The method includes: in a first operating mode, the beam to be tested is incident on a geometric phase polarization grating, separating it into a zero-order diffraction spot containing the original polarization state and diffraction spots with left- and right-hand circular polarizations on either side; the ellipticity and direction of rotation of the beam to be tested are determined by measuring the light intensity of the two spots; a rotatable analyzer is placed behind the grating, and the polarization azimuth angle of the beam to be tested is determined by rotating the analyzer and measuring the change in the light intensity of the zero-order diffraction spot. In a second operating mode, a polarizer is placed in front of the grating to convert the beam to be tested into linearly polarized light; the light intensity of the separated zero-order diffraction spot and the diffraction spot on either side are measured; and the wavelength of the beam to be tested is determined based on the relationship between the intensity ratio and the wavelength. This method achieves integrated and efficient detection of all polarization parameters and wavelength of the beam, and is suitable for wide-band analysis.