22 results about "Elliptically polarized light" patented technology

The invention relates to the technical field of optical element surface shape dynamic measurement scheme design, in particular to an element surface shape dynamic measurement system based on a metasurface. According to the scheme, polarized light emitted by a laser is split into reference light and test light, the test light passes through a quarter-wave plate twice to realize polarization orthogonalization, and the test light is combined with the reference light to form elliptically polarized light; synchronously capturing component intensities of left-handed / right-handed circular polarized light and orthogonal line polarized light by using a detector, and resolving a phase difference delta in real time by combining a Stokes parameter; environmental interference is eliminated based on a common-path design, a polarization beam-splitting element is omitted, and the architecture is simplified; accurate dynamic measurement of the surface shape of the measured piece is realized by deducting the inherent surface shape error of the system. The system provided by the invention has the advantages of strong anti-interference performance, high measurement efficiency, remarkable cost reduction and the like, and is suitable for precise optical manufacturing and on-line detection scenes.

The present invention provides a distance calculation device that can calculate distance information relating to the distance a workpiece travels. [Solution] The system comprises a light source 10 that emits light, a first optical system 20 that converts the light from the light source into elliptical polarization and emits it toward a workpiece W1 that is transparent and moving in a specific direction, a second optical system 30 that converts the light from the workpiece into linear polarization and emits it, and an optical sensor 40 that acquires optical information of the workpiece based on the light from the second optical system. The first optical system includes a first polarizing filter 22 that converts to linear polarization and a first waveplate 23 that converts the linear polarization from the first polarizing filter into elliptical polarization. The second optical system 30 includes a second waveplate 31 that converts the light from the workpiece and a second polarizing filter 32 that is placed between the second waveplate and the optical sensor 40 and converts the light from the second waveplate into linear polarization.

A stereoscopic display device (100) includes a first image display section (110) that outputs first image light (151) of linearly polarized light, a second image display section (120) that outputs second image light (152) of linearly polarized light, a first phase difference plate (112) that modulates the first image light (151) output from the first image display section (110) to convert it into first elliptically polarized light, a second phase difference plate (122) that modulates the second image light (152) output from the second image display section (120) to convert it into second elliptically polarized light that rotates in the same direction as the first elliptically polarized light, and a half mirror (130) that transmits the first elliptically polarized light to make it first circularly polarized light that rotates in the same direction as the first elliptically polarized light, and reflects the second elliptically polarized light to make it second circularly polarized light that rotates in the opposite direction to the second elliptically polarized light.

A three-dimensional display device includes: a first image display that outputs linearly polarized first image light; a second image display that outputs linearly polarized second image light; a first retardation plate that modulates and converts the first image light output from the first image display to first elliptically polarized light; a second retardation plate that modulates and converts the second image light output from the second image display to second elliptically polarized light that rotates in a direction identical to a rotation direction of the first elliptically polarized light; and a half mirror that transmits the first elliptically polarized light, converts the first elliptically polarized light to first circularly polarized light that rotates in a direction identical to the rotation direction of the first elliptically polarized light, reflects the second elliptically polarized light, and converts the second elliptically polarized light to second circularly polarized light that rotates in a direction opposite the rotation direction of the second elliptically polarized light.

The invention relates to an assembly error elimination method for a liquid crystal polarization state controller, which comprises the following steps of: constructing an assembly error model by adopting a Mueller matrix, and simulating and analyzing an influence rule of an angle error of a polaroid and an LCVR2 (Liquid Crystal Voltage Receptor 2) on a polarization state; based on an influence rule of assembly errors, a two-step correction strategy based on computer-aided assembly and adjustment is provided. The two-step correction strategy comprises the following steps: firstly, carrying out angle correction on a polaroid by taking ellipsometric skewness of circularly polarized light as a criterion; then, angle correction of the LCVR2 is carried out on the basis of the included angles among the three pieces of linearly polarized light; an experiment light path is built for experiment verification, and meanwhile, the installed and adjusted liquid crystal polarization state controller is used for generating elliptically polarized light to verify the effectiveness of installation and adjustment. The method can effectively eliminate the assembly error, and achieves the high-precision output of the polarization state.

Provided is a lens device, an optical filter unit, and an imaging device that can suppress the generation of ghost images. The lens device includes an optical filter unit in an optical path. The optical filter unit includes a plurality of openings including a first opening and a second opening, at least the first opening and the second opening include a band-pass filter, and at least one of an object side and an image side of the band-pass filter includes an optical element. The optical element includes a polarizing filter and a wave plate that converts linearly polarized light into circularly polarized light or elliptically polarized light, and the first opening and the second opening pass light of mutually different wavelength regions and polarization directions.

The utility model provides a focal plane full polarization sensing device, including substrate, phase delay layer, polarization detection layer and CCD sensor, the phase delay layer and polarization detection layer are arranged on one side of substrate in proper order, the phase delay layer has a plurality of phase delay zone in array arrangement, and the CCD sensor is arranged in the phase delay zone. The phase delay area comprises 2x < 2 > pixel units in different fast axis directions, the polarization detection layer is in single horizontal orientation, and the phase delay layer and the polarization detection layer are combined to form an elliptical polarization array, so that the simultaneous detection of four elliptical polarized lights is realized. The manufacturing process of the focal plane splitting polarization sensing device based on the metal wire grating is simplified, the manufacturing cost is reduced, efficient polarization imaging of the infrared band can be achieved, and the multi-band compatibility of the device is improved.

The invention provides a light generating system (1000) comprising a first light generating device (110), a luminescent material (200), a diffuser assembly (700), optical elements (500), and a light exit (1090), wherein; (A) the first light generating device (110) is configured to generate first device light (111); (B) the optical elements (500) comprise a first redirection optical element (1510) configured in a light-receiving relationship with the first light generating device (110); wherein the first redirection optical element (1510) is configured to (i) direct the first device light (111) in an optical path to the diffuser assembly (700), and to (ii) direct at least part of diffused device light (711) in an optical path to the luminescent material (200) (C) the diffuser assembly (700) comprises (a) a diffuser (710), wherein the diffuser (710) comprises a polarization maintaining diffuser, wherein the diffuser (710) is configured in the reflective mode; wherein the diffuser (710) is configured to diffuse at least part of the first device light (111) received by the diffuser (710) into diffused device light (711), wherein the diffused device light (711) has a full width half maximum of at least 5°; and (b) a quarter waveplate (720); wherein the light generating system (1000) is configured such that first device light (111) reaching the quarter waveplate (720) comprises linearly polarized light; wherein the quarter waveplate (720) is configured to convert linear polarized light received by the quarter waveplate (720) into elliptical polarized light and to convert elliptical polarized light received by the quarter waveplate (720) into linear polarized light; wherein the diffuser assembly (700) is configured to provide the diffused device light (711) in an optical path to the luminescent material (200) via the first redirection optical element (1510); (D) the luminescent material (200) is configured to convert at least part of the diffused device light (711) received by the luminescent material (200) into luminescent material light (201); (E) the optical elements (500) are configured to direct at least part of the luminescent material light (201) in an optical path to the light exit (1090); and (F) the light generating system (1000) is configured to generate in an operational mode of the light generating system (1000) system light (1001) comprising at least part of the luminescent material light (201).

The invention relates to dynamic adjustable optical tweezers based on a polarization-sensitive transverse bifocal superlens, and belongs to the field of optical tweezers technology and micro-nano optics. According to the super-lens, dynamic regulation and control of a focus are realized by using sensitive response of the silicon nano-column array to polarization through a composite propagation phase and a geometric phase. Under linear polarization or elliptically polarized light, the system can generate transversely symmetrical double focuses; under the circularly polarized light, a single-side focus is formed. By adjusting the polarization state of incident light, a double-particle capture mode, a single-particle capture mode and a particle transverse transport mode can be flexibly switched. According to the invention, the physical structure does not need to be changed, the dynamic control can be realized only by external optical regulation and control, the structure is compact, the integration degree is high, the control is flexible and the like, and a new technical approach is provided for an on-chip particle control system.

A light filter including first and second optical elements having light-absorbing transition dipole moments orientated with a tolerance of at most 20° parallel to a first direction for the first optical element and for the second optical element parallel to a second direction so light incident in the first or second optical element is transmitted or partially absorbed, depending on its direction of incidence relative to the respective element and its polarization state. A delay layer is between the elements as a C- or A-plate so that at least 85% of linearly- or elliptically-polarized light incident into the light filter at an angle of at least 35° to the first or second direction is absorbed, wherein the angle between the electric field of the linearly-polarized light or long half-axis of the elliptically-polarized light and the direction of incidence, projected onto the surface of the light filter, is less than 20°.

An identification medium including a light reflection layer and a patterned phase difference layer, wherein the light reflection layer is a layer that reflects incident light as circularly polarized light or linearly polarized light, and the patterned phase difference layer is a layer that includes an area having a phase difference, and is a layer provided in the identification medium so that the area having a phase difference occupies a partial area of a display surface of the identification medium. Also provided are an article including the identification medium, and a method for using the identification medium wherein, in observation of the reflected light, a linear polarization component or a circular polarization component of the reflected light is selectively observed, or linearly polarized light, circularly polarized light, or elliptically polarized light is made incident as the incident light.

The application discloses an ellipsoidal light magnetic signal detection system and method based on a cascade super surface, wherein the system utilizes a cascade super surface polarization conversion device to emit elliptical polarized light with specific ellipticity, and guides the elliptical polarized light into an atomic chamber to interact with alkali metal atoms to realize magnetic field measurement. According to the required ellipticity, the application designs the Jones matrix of the cascade super surface, designs the material, structure and period of the super surface, converts the light emitted by a laser into elliptical polarized light with a predetermined ellipticity, and after the elliptical polarized light enters the atomic chamber, the optical rotation effect is generated while the alkali metal atoms are polarized, and the differential detection technology and the lock-in amplification technology are utilized to obtain the magnetic field information to be measured. Compared with a conventional magnetic signal detection system, the magnetic signal detection system built by using the cascade super surface polarization conversion device has the advantages of small volume and easy integration due to the compact structure and the miniaturized design concept.

The invention belongs to the technical field of rotational motion, and relates to a remote speed measurement method and system based on a partially coherent rotational Doppler Effect. Gaussian-Schell model partially coherent light is modulated into a circular polarization state and then is irradiated to a rotating object to be measured, and elliptically polarized light reflected by the rotating object to be measured is modulated by using a rotating linear polarizer; generating a first periodic time-domain light beam related to polarization information, screening the first periodic time-domain light beam by using a post-modulation mask of a three-hole structure to obtain a second periodic time-domain light beam related to rotation speed information, and performing Fourier transform on the second periodic time-domain light beam to obtain a Fourier spectrum; acquiring a polarization peak signal and a rotation peak signal in the Fourier spectrum, calculating the angular velocity of the rotating object to be measured based on the frequency of the rotation peak signal, and obtaining the polarization response of the rotating object to be measured based on the amplitude of the polarization peak signal and the amplitude of the rotation peak signal. According to the scheme, the rotating speed of an off-axis object can be accurately measured, and polarization response characteristics are obtained.

This invention relates to the field of optical engineering technology, specifically disclosing a polarized optical lens glare elimination system for vehicle-mounted security. The system includes: a reference polarization module, which constructs a controllable environment simulation test platform to collect reflected light data under different incident angles and water film thicknesses, calculates the degree of polarization and phase difference using the Stokes vector method, and constructs a quasi-polarized light characteristic library; a composite filtering module, which collects real-time reflected light data and compares it with the quasi-polarized light characteristic library to determine elliptically polarized light, and corrects it to linearly polarized light through phase compensation; a direction calibration module, which calculates the optical path deviation angle through a real-time direction calibration module and dynamically adjusts the filtering direction; a glare recognition module, which performs light intensity analysis on the corrected light to determine glare residue, identifies micro-glare spot areas through polarization degree calculation; and a grayscale correction module, which extracts the average grayscale value of the normal area and corrects the grayscale of the spot pixels, thereby achieving dynamic elimination of glare from reflected light on wet road surfaces.

The invention relates to the technical field of inter-satellite laser communication. The invention discloses an inter-satellite laser communication adaptive dynamic light splitting device and method, a satellite and a system, which can realize dynamic adjustment of a tracking light path and a communication light path splitting ratio, and is high in response speed and simple in structure. The device comprises a micro-electro-mechanical system and a polarization beam splitter, and the micro-electro-mechanical system is used for adjusting the phase delay amount of linearly polarized light at the current moment according to an adjusting signal and then outputting elliptically polarized light; and the polarization beam splitter is used for carrying out polarization state separation processing on the elliptically polarized light to obtain a first polarized light beam and a second polarized light beam corresponding to the current moment.

This invention provides a single-optical magnetic signal detection system and method based on a polarizing body grating, comprising: a laser, a pre-optical path unit, an atomic gas cell unit, a polarization detection unit, and a signal processing unit. The light emitted by the laser is modulated into elliptically polarized light by the pre-optical path unit and acts on the atomic gas cell unit, causing the alkali metal atoms to spin polarize. The polarization detection unit and signal processing unit then measure the magnitude of the external magnetic field using optical rotation detection. This method combines the advantages of existing single-optical and dual-optical atomic magnetometers, featuring a compact structure and simplified optical path. Differential detection suppresses common-mode noise, improving measurement accuracy and sensitivity. The optically pumped atomic magnetic resonance polarization detection is achieved using a liquid crystal polarizing body grating thin-film device with efficient polarization chiral splitting and large-angle single-order diffraction performance, realizing miniaturized design of the magnetic measurement system and laying the foundation for the system to move towards chip-level design.

Provided are a lens device, a filter unit, and an imaging apparatus capable of suppressing occurrence of ghosts. The lens device includes a filter unit in an optical path. The filter unit has a plurality of opening portions including a first opening portion and a second opening portion. At least the first opening portion and the second opening portion each include a band-pass filter, and each include an optical element on at least one of an object side or an image side of the band-pass filter. The optical element is composed of a polarized light filter and a wave plate which converts linearly polarized light into circularly polarized light or elliptically polarized light. The first opening portion and the second opening portion pass light in different wavelength regions and different polarization directions.

The invention belongs to the technical field of ocean polarized light detection, and discloses a light source unit with polarization mode distribution characteristics, a device and a control method. The light source device is formed by arranging a plurality of light source units vertically and horizontally, incident monochromatic light is divided into three paths by a beam splitter, and the first path of light is a linearly polarized light control light path and is processed by a linearly polarized light control unit; the second path of light is an elliptical polarized light control light path and is processed by an elliptical polarized light control unit; and the third path of light is a bypass light path of the incident light. The linearly polarized light control unit is formed by connecting a linearly polarized light intensity control subunit and a linear polarization angle adjusting subunit in series, and the elliptically polarized light control unit is formed by connecting an elliptically polarized light intensity control subunit and an elliptically polarized mode adjusting subunit in series. Based on the light source device, four polarization distribution images generated by a computer can be utilized to control polarization parameters such as a polarization angle, a polarization degree and a polarization mode of light emitted by each light source unit, so that an area light source with expected polarization mode distribution characteristics is realized.

The application relates to a spectrometer, which comprises a light-emitting element, a diaphragm, a light-splitting element and a chiral photoelectric detector. The diaphragm is arranged on the propagation path of the light emitted by the light-emitting element and is used for limiting the width of the light emitted by the light-emitting element and passing through the diaphragm; the light-splitting element is arranged on the propagation path of the light irradiated by the diaphragm and is used for dispersing the light irradiated by the diaphragm into light of multiple wavelengths; the chiral photoelectric detector is arranged on the propagation path of the light dispersed by the light-splitting element and is used for receiving the light dispersed by the light-splitting element and converting the light into an electric signal; and the chiral photoelectric detector is used for identifying and converting circularly polarized light or elliptically polarized light into an electric signal. The arrangement of the chiral photoelectric detector enables the spectrometer to identify and detect circularly polarized light or elliptically polarized light, so that the spectrometer does not need to frequently replace the detector during detection, the detection efficiency of the spectrometer is improved, and the detection cost is reduced.

The invention relates to a method and a device (2) for profilometry of an object surface (40) of a flat object (20) having an unknown material, the device comprising: an optical interferometric measuring system (4); an ellipsometric measuring system (5); a beamsplitter (82) for splitting a light beam of a light source (111) into an interferometric measuring light beam (410) and an ellipsometric light beam (420); and an evaluation unit configured to ascertain a profile height in a measurement region on the object surface (40) from an evaluation light beam (490) evaluated in a detector unit (250) of the interferometric measuring system and a sensor light beam (520) received in an ellipsometric sensor (220). The interferometric measuring system (4) comprises a beamsplitter (91), a reference mirror (60) and a detector unit (250). The ellipsometric measuring system (5) comprises: a polarizer (190) for polarizing the ellipsometric light beam (420) and passing it onto the measurement region on the object surface (40); and an ellipsometric sensor (220) with a polarization filter to determine the polarization state of the received sensor light beam.

The invention provides a perfect circularly polarized light generation device, laser processing equipment and a laser processing method, and the device comprises an elliptically polarized light generation system which is used for generating elliptically polarized light; the polarization modulation system is arranged on the light emitting side of the elliptically polarized light generation system, and the polarization modulation system is configured to apply periodically-changed deflection modulation to the azimuth angle of the elliptically polarized light so as to output the elliptically polarized light with the periodically-changed azimuth angle, and the integral average effect of the projection of the elliptically polarized light with the periodically-changed azimuth angle along the light beam emergent direction on time is equivalent to that of perfect circularly polarized light. According to the embodiment of the invention, periodically changing deflection modulation is applied to the azimuth angle of the elliptically polarized light through the polarization modulation system, and the perfect circularly polarized light can be generated.

Surface haze is eliminated.SOLUTION: The inspection system 100 may include an illumination source for generating an illumination beam, illumination optics for directing the illumination beam to a sample along an illumination direction at a non-axial angle, and collection optics for collecting scattered light emanating from the sample in a dark-field mode. Light scattered from specimen 106 includes surface haze associated with light scattered from the surface of the specimen and at least a portion of the surface haze having elliptical polarization. The system may further comprise pupil plane optics for converting the polarization of the surface haze passing through the pupil to a linear polarization aligned parallel to the selected haze orientation direction. The system may include a linear polarizer 108 that rejects surface haze aligned parallel to the haze orientation direction, and a detector 110 that generates a dark field image of the sample based on light passed through the linear polarizer 108.SELECTED DRAWING: Figure 7