28 results about "Beam polarization" patented technology

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 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 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 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.

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 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 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 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.

The application provides an alcohol concentration real-time measurement method based on fringe period measurement, a laser emits a laser beam, a first half-wave plate adjusts components of s-polarized light and p-polarized light of the laser beam, and a polarization beam splitter prism divides the laser beam into two beams of s-polarized light and p-polarized light; the p-polarized light is transmitted by the polarization beam splitter prism and enters a second half-wave plate, the second half-wave plate converts the p-polarized light into s-polarized light and then the s-polarized light is incident into a sample flow cell; the s-polarized light is refracted by the polarization beam splitter prism and then enters a prism, and after three times of total reflection of the prism, the s-polarized light irradiates the sample flow cell; the sample flow cell contains a solution to be measured, two beams of s-polarized light intersect in the solution to form interference fringes, and the interference fringes are recorded by an image sensor; and the refractive index and concentration change of the solution are inversed by measuring the interference fringe period.

The invention discloses an auto-collimation micro-angle measuring device and method, and relates to the technical field of precision metering and detection.The auto-collimation micro-angle measuring device comprises a light source, a diffraction grating, a collimating lens, a polarization splitting prism, a reflector and an angle measuring body, and the diffraction grating can convert a light beam emitted by the light source into a divergent diffraction array light beam; the collimating lens can collimate the divergent diffraction array light beam and form a parallel diffraction array light beam; the polarization splitting prism can reflect part of diffraction array light in the parallel diffraction array light beam to the angle measurement body as reference array light, and the other part of diffraction array light in the parallel diffraction array light beam can be transmitted to the reflector by the polarization splitting prism and reflected to the angle measurement body as measurement array light by the reflector; the angle measurement body is capable of performing angle measurement of the mirror based on the reference array light imaging and the measurement array light imaging. According to the invention, multi-point synchronous and high-precision angle monitoring of the corresponding area on the measured surface can be realized.

A depolarization compensator for at least partial compensation of a location-dependent variation of a polarization of a laser beam includes a first compensation component comprising a birefringent material, and having a planar beam entry surface for entry of the laser beam and a beam exit surface for exit of the laser beam. A thickness of the first compensation component between the beam entry surface and the beam exit surface varies in a location-dependent manner in order to at least partially compensate for the location-dependent variation of the polarization of the laser beam. The depolarization compensator further includes a second compensation component for at least partial compensation of a light-refractive effect of the first compensation component on the laser beam. The second compensation component has no birefringent effect on the laser beam.

The invention discloses a laser polarization state monitoring and correction system based on a liquid crystal device. The laser polarization state monitoring and correction system comprises a non-polarization beam splitter, a monitoring module, a calculation module, a voltage output module and a dynamic polarization correction module. The non-polarization beam splitter divides an incident beam into a main light path and a monitoring light path, the monitoring module separates an incident light polarization component through a liquid crystal two-dimensional polarization grating, and after the incident light polarization component is modulated by a linear polarizer, an image sensor collects light field information at a time. The calculation module solves a full stokes parameter of incident light based on the information and compares the full stokes parameter with a target parameter to obtain an optical axis included angle, the voltage output module outputs correction voltage accordingly, and the dynamic polarization correction module modulates the ovality and the polarization azimuth angle of a light beam of a main light path through two ferroelectric liquid crystal wave plates respectively. According to the laser polarization state monitoring and correcting system based on the liquid crystal device, the polarization state of a light beam can be rapidly and stably maintained in a target state, and the laser polarization state monitoring and correcting system is suitable for multiple fields of laser communication, optical measurement and the like.

The present application relates to the technical field of optical detection, and particularly relates to a kind of dynamic polarization analysis devices of light beam based on super surface.The device includes polarization analysis function unit array, and each function unit is made of four subunits: left-handed light detection unit, right-handed light detection unit, vertical linear polarization detection unit and horizontal linear polarization detection unit, respectively based on chiral subwavelength micro-nano structure and subwavelength cuboid structure to realize the synchronous detection of a pair of orthogonal circular polarization and a pair of orthogonal linear polarization.The device can be attached or directly processed on the camera target surface, and global polarization analysis is realized by surface array arrangement.The present application solves the problems of complex system and poor environmental adaptability of existing polarization phase-shifting interferometry, has the advantages of simplified structure, high detection precision and strong environmental robustness, and is suitable for dynamic optical surface shape detection applications.

The present application provides a polarization beam splitting module, which is applied to an environment for receiving a pulsed light. The polarization beam splitting module comprises a linear polarizer, a quarter phase retarder, a beam splitter, an air layer, a mirror and an isolation layer. The linear polarizer is used to convert an arbitrary light beam into linearly polarized light. The quarter phase retarder is used to convert the linearly polarized light into circularly polarized light. The beam splitter is used to split a circularly polarized light beam into two left-handed (right-handed) circularly polarized light beams, which have the same phase and intensity and perpendicular traveling directions. The left-handed (right-handed) circularly polarized light is converted into right-handed (left-handed) circularly polarized light after passing through the air layer and the mirror. The mirror is used to change the transmission direction of the light beam. The isolation layer is used to protect the polarization beam splitting module. The present application further provides a four-beam polarization beam splitting system comprising the polarization beam splitting module.

The application provides a digital holographic speckle suppression imaging system based on a rotating ball lens, and belongs to the technical field of digital holographic speckle suppression imaging systems; in order to solve the technical problems of complex optical path structure, low imaging quality and high manufacturing cost of laser modulation elements in the current speckle noise suppression, the technical scheme is that: the laser beam emitted by the laser passes through a filter to modulate the intensity, a first half-wave plate to modulate the polarization state, a rotating ball lens to modulate the incident light angle, and an optical stop filter in sequence, and finally is divided into an object beam and a reference beam by a polarization beam splitter prism; the object beam is reflected by a first reflector to irradiate on a sample object and is reflected back to the beam splitter prism; the reference beam is reflected by a second reflector, then passes through a second half-wave plate to make the polarization state of the reference beam consistent with that of the object beam, and finally is combined by the beam splitter prism to interfere at a CCD camera to form an interference pattern; the application is used for suppressing the speckle noise of the digital holographic imaging system.

A beam such as a laser beam a known polarization state is passed through the container. An electrical field is created in the container to reduce optical interference while preserving the ability to more accurately measure the concentration of one or more gasses in the container. A change in the polarization state of the beam after passage through the container is detected. Based on the detected change in the polarization state of the beam, the presence of the one or more gasses can be determined.

The invention discloses a slow axis homogenization compression device and method based on self-polarization beam combination, and the device comprises a light source which is used for transmitting incident laser a; the collimating lens (1) is used for carrying out fast and slow axis collimation processing on the incident laser a and reducing a fast and slow axis divergence angle of the incident laser a; the light beam dividing element is used for equally dividing the collimated incident laser a into a sub-light beam Ia1 and a sub-light beam IIa2 along the slow axis direction; the polarization regulation and control element is used for carrying out polarization state regulation and control on the sub light beam IIa2; the light path steering element is used for changing the propagation direction of the sub light beams IIa2 after polarization regulation and control; and the polarization beam combining element (5) is used for receiving the directly incident sub-beam Ia1 and the sub-beam IIa2 subjected to polarization regulation and light path steering to form emergent laser b. The technical problems that in the prior art, semiconductor laser slow axis light beam homogenization and light spot compression cannot be achieved synchronously, and the optical expansion amount is increased after light beam homogenization are solved.

A heterodyne interferometer system comprising: a first light source providing a first laser beam having a first frequency f1; a second light source providing a second laser beam having a second frequency f2 different from the first frequency; a combiner for polarizing the first laser beam and the second laser beam and for providing an input beam, wherein the polarized first laser beam and the polarized second laser beam are combined; an optical resonator cavity comprising an odd number of at least partially reflecting mirrors arranged in the cavity for reflecting the input beam and circulating it in the cavity, the cavity being adapted to receive the input beam and provide an output beam comprising a first spatial mode having the first frequency f1 and a first polarization, and a second spatial mode having the second frequency f2 and a second polarization different from the first polarization; and a heterodyne interferometer for receiving the output beam.

The application discloses a method for generating a radially polarized high-order twisted non-uniform correlation light beam, and the method comprises the following steps: step 1, setting a weight matrix and a kernel function; step 2, obtaining a light beam cross-spectral density matrix element by integrating the weight matrix element and the kernel function; step 3, determining a restriction condition of a twist factor; step 4, setting a restriction condition of a light beam polarization state satisfying radial polarization; and step 5, determining a cross-spectral density matrix element of the radially polarized high-order twisted non-uniform correlation light beam according to the restriction conditions of the light beam twist factor and the polarization state satisfying radial polarization. The application enriches the partial coherent vector beam regulation method and provides a novel light field model with application value for the fields of optical micro-manipulation and anti-depolarization optical communication.

The invention belongs to the field of optical measurement, and discloses a polarization and wavelength joint detection method and device based on light beam spin separation, and the method comprises the steps: enabling a to-be-detected light beam to enter a geometric phase polarization grating in a first operation mode, the zero-order diffraction light spot comprises an original polarization state, and the left-handed circular polarization diffraction light spot and the right-handed circular polarization diffraction light spot are arranged on the two sides of the zero-order diffraction light spot respectively. By measuring the light intensity of the light spots on the two sides, the elliptic polarization and the rotation direction of the to-be-measured light beam are determined; a rotatable polarization analyzer is arranged behind the grating, and the polarization azimuth angle of the light beam to be measured is determined by rotating the polarization analyzer and measuring the change of the light intensity of the zero-order diffraction light spot. And in the second operation mode, a polarizer is arranged in front of the grating to change the to-be-measured light beam into linearly polarized light, the light intensity of the separated zero-order diffraction spot and any side diffraction spot is measured, and the wavelength of the to-be-measured light beam is determined according to the relationship between the light intensity ratio and the wavelength. The method realizes the integrated and efficient detection of the light beam polarization total parameter and wavelength, and is suitable for broadband analysis.