249 results about "Birefringence" patented technology

The invention discloses a light spot adjustable optical system, a diffraction optical module and laser processing equipment, and relates to the technical field of precision processing. The optical system comprises a laser, a beam expander, a diffractive optical module and a focusing module which are sequentially arranged in the light path direction, the diffractive optical module comprises at least one diffractive optical element, and the diffractive optical element is manufactured based on a geometric phase liquid crystal polymer birefringent material. The diffractive optical module is used for regulating and controlling light spot characteristic parameters corresponding to a Gaussian beam, the Gaussian beam is emitted by the laser and enters the diffractive optical module after being expanded and collimated by the beam expander, and the light spot characteristic parameters comprise a light spot distribution position and light spot energy intensity. By the adoption of the optical system, laser energy distribution can be optimized, splashing is effectively restrained, and the welding quality and the processing efficiency are improved.

The invention discloses a femtosecond laser direct-writing Type X structure-based geometric phase fork-shaped grating, a preparation method and application of the femtosecond laser direct-writing Type X structure-based geometric phase fork-shaped grating in vortex light, and belongs to the technical field of laser processing, and the femtosecond laser direct-writing Type X structure-based geometric phase fork-shaped grating comprises design and parameter calculation of a geometric phase fork-shaped grating device, determination of a processing parameter window of a Type X structure and the femtosecond laser direct-writing fork-shaped grating. According to the invention, femtosecond laser is utilized to induce and generate an anisotropic nanopore structure with ultra-high transmittance higher than 97% in fused quartz and other transparent materials, namely a Type X structure, the structure has a birefringence characteristic, and the slow axis angle of the structure is always perpendicular to the laser polarization direction, so that the slow axis angle can be continuously adjusted by adjusting laser polarization. The Type X structure serves as a metasurface unit of the geometric phase fork-shaped grating, geometric phase regulation and control are achieved by controlling slow axis orientation of the Type X structure, and therefore generation and regulation and control of vortex light are achieved. The method is high in efficiency and simple in process.

The invention discloses a rheology-birefringence combined in-situ testing device and method based on chopper rotation frequency signals, belongs to the technical field of optical testing, and aims to solve the technical problems that an existing Spark-FB device is low in measurement accuracy and limits application scenes. The laser emitter emits a light beam along a set angle (forming an angle of 45 degrees with the horizontal plane), the light beam is converted into linearly polarized light through the polarizer, and an optical signal is modulated through the rotating chopper; the modulated light beam penetrates through a polymer sample to which a shear flow field is applied by a commercial rheometer, and transmission light carrying optical anisotropy information of the sample sequentially passes through a 1 / 4 wave plate and a polarization analyzer, and is finally received by a photoelectric detector and transmitted to a lock-in amplifier for analysis. According to the invention, an independent datum reference signal is provided through the chopper, decoupling and combination of a commercial rheometer and a birefringence light path are realized, and synchronous and accurate in-situ measurement of rheological and optical properties of a high polymer material under a deformation condition can be realized.

The invention relates to the technical field of material analysis, in particular to a light microscope-field emission electron microscope combined shale rock slice analysis and identification method, which comprises the following steps of: firstly, combining a brightness distribution condition represented by a bright field image of a shale rock slice and a birefringence deviation condition represented by a cross polarization image from an optical angle; determining a mineral discrimination index representing an atomic number agent; applying offsets of different sizes based on the distribution condition of mineral discrimination indexes and the surface fluctuation condition of shale rock slices, and determining a position offset vector by combining gray scale gradient distribution on the basis; and finally, determining the cross-scale positioning and more accurate electron microscope objective table coordinates corresponding to each pixel point in combination with a position offset vector in a pixel coordinate conversion process based on an image physical distance scale and rotation translation processing, so that the cross-scale positioning accuracy of the optical microscope and the field emission scanning electron microscope is higher. The reliability of analyzing and identifying the shale rock slice is obviously improved.

The invention belongs to the field of quantum precision measurement, and particularly discloses an all-fiber phase detection system and method based on polarization interference quantum weak measurement. The device sequentially comprises a laser light source, a front selection module, a phase regulation and control module, a rear selection module and a photoelectric acquisition module along a light path. The front selection module prepares linearly polarized light emitted by the laser light source into two equal-amplitude superposition states in a cross-polarization mode as initial polarization states, and the phase regulation and control module senses the phase difference after change conversion of a physical quantity to be measured, dissipates the phase difference accumulated by the two polarization states in the sensing transmission process, and adjusts the phase difference of the two polarization states. And the post selection module performs nearly orthogonal projection measurement on the polarization state, in the process, a birefringence phase difference caused by a physical quantity to be measured is converted into a weak-value amplified light intensity signal, and the photoelectric acquisition module obtains the physical quantity to be measured by monitoring the relative variation of the optical power. Based on the quantum weak measurement principle, the birefringence phase difference caused by the to-be-measured physical quantity is converted into the weak value amplified optical power signal, and the sensing sensitivity is improved.

This invention relates to a retardation film comprising: an A layer having a slow axis, and a B layer having a slow axis at an angle of 85° to 90° to the slow axis of the A layer; the A layer is formed of a resin A having positive intrinsic birefringence; the B layer is formed of a resin B having negative intrinsic birefringence; the resin B comprises polyester, polycarbonate, or polyester carbonate, wherein the polyester, polycarbonate, or polyester carbonate contains a fluorene framework; the overall in-plane retardation of the A layer and the overall in-plane retardation of the B layer satisfy a specific relationship; the in-plane retardations Re(450) and Re(550) of the retardation film at wavelengths of 450 nm and 550 nm satisfy a specific relationship; the overall thickness T of the A layer... A The overall thickness T of layer B B The ratio of T A / T B It ranges from 30 / 70 to 65 / 35.

Provided is a structurally birefringent inorganic wavelength plate having excellent heat resistance and durability and having a fine pattern. Furthermore, the present invention provides a method for producing an inorganic wavelength plate, which has a high yield even in the form of a fine pattern, can easily achieve a desired phase difference, and can stably obtain the desired phase difference. An inorganic wavelength plate having a wire grid structure is obtained by selective interaction between a polymer having a repeating unit containing a carbonyl group and a metal oxide precursor, the inorganic wavelength plate being provided with a transparent substrate and lattice-shaped protrusions, and lattice-shaped protrusions that are arranged on at least one surface of the transparent substrate at a pitch shorter than the wavelength of light in the use frequency band and extend in a predetermined direction, the lattice-shaped protrusions being mainly composed of a metal oxide.

The purpose of the present invention is to provide: a polycarbonate resin that has a high refractive index, low birefringence, and a glass transition temperature that is suited to use in an optical lens; and an optical member that includes the polycarbonate resin.　This thermoplastic resin includes repeating units represented by formula (1), formula (2), and formula (3), the repeating units represented by formula (1) being 70.0–98.0 mass% of all the repeating units, and the repeating units represented by formula (3) being 0.1–3.0 mass% of all the repeating units. (In formula (1), R1–R4 each independently represent a hydrogen atom, a halogen atom, a C1–20 substituent that may include an aromatic group, or a C2–20 substituent that includes a heterocycle, and m1 and m2 each independently represent 0 or 1.) (In formula (2), n1 and n2 each independently represent 0 or 1.) (In formula (3), X represents a C4–14 alkylene group.)

This invention discloses a method for analyzing the propagation path of anomalies in PE blow molding production, relating to the field of production path technology. It addresses the issues of fluctuating film structural performance and unstable product quality. By reshaping the circumferential angle of the film bubble, collecting the zoned current of the air ring drive motor and the outlet pressure of the air duct in each region to assess the air duct blockage trend, and triggering a propagation analysis mechanism when a blockage trend exists, the method obtains the circumferential temperature distribution of the film bubble and constructs temperature hysteresis characteristics based on the rotation speed. It identifies areas of abnormal cooling, aligns each region by rotation, collects the birefringence intensity of the film surface to assess the structural state and identify structural anomaly nodes, constructs a propagation path from air ring anomaly to structural anomaly, verifies the consistency of the propagation path, selects air duct cleaning or air ring adjustment based on the anomaly effect, and verifies the feedback through tensile strength testing after winding. This constructs a time-series propagation chain of air ring temperature and structural performance, enabling online identification and tracing of latent anomalies.

An optically anisotropic polymer thin film includes a crystallizable polymer and an additive configured to interact with the polymer (e.g., via π-π interactions) to facilitate chain alignment and, in some examples, create a higher crystalline content within the polymer thin film. The polymer thin film may be characterized by a bimodal molecular weight distribution where the molecular weight of the additive may be less than approximately 50% of the molecular weight of the crystallizable polymer. Example crystallizable polymers include polyethylene naphthalate, polyethylene terephthalate, polybutylene naphthalate, polybutylene terephthalate, as well as derivatives thereof. Example additives, which may occupy up to approximately 10 wt. % of the polymer thin film, include aromatic ester oligomers, aromatic amide oligomers, and polycyclic aromatic hydrocarbons, for example. The optically anisotropic polymer thin film may be characterized by a refractive index greater than approximately 1.7 and an in-plane birefringence greater than approximately 0.2.

The present application belongs to the field of geophysical exploration and geoscience information sensing technology, and relates to an intelligent sensing system for ground construction risk monitoring, comprising: a pulse generation module for generating a detection pulse sequence with a preset time interval; an orthogonal polarization modulation module for mapping the detection pulse sequence with an orthogonal polarization state and loading a time delay modulation; a distributed sensing module for receiving pulse combination and generating a backscattering signal; a common mode interference cancellation module for superimposing the backscattering signal in the photon domain to generate a phase push effect, in-situ canceling a static resident stress background noise, and extracting a dynamic birefringence phase shift amount; and a signal decoupling analysis module for identifying a dynamic shear signal according to a covariance tensor principal eigenvalue extraction value. The present application utilizes an optical domain physical interference cancellation mechanism to annihilate static background interference, realizes high-fidelity physical extraction of weak dynamic signals, and improves the identification ability of the system for structural medium shear instability.

The invention relates to the technical field of films, in particular to an optical composite film of a composite polylactic acid core layer and a preparation method of the optical composite film. The optical composite film is of a three-layer structure and comprises a composite polylactic acid core layer made of specific raw materials and amorphous polylactic acid skin layers on the two sides. The core layer is prepared from the following raw materials: poly (L-lactic acid) resin, poly (D-lactic acid) macromolecules, carboxyl-terminated poly (D-lactic acid) oligomers, a multifunctional epoxy chain amplification agent and aminated nano silicon dioxide. During preparation, key processes such as step-by-step addition of the chain extender, the D-lactic acid component and the aminated nano silicon dioxide and three-layer co-extrusion stretching are carried out, so that the molecular structure and the dispersion state of the material are synergistically optimized. The method effectively solves the technical contradiction that a traditional polylactic acid optical film is difficult to consider high light transmittance, low birefringence and low thermal shrinkage at the same time.

This invention provides a resin that combines high refractive index, high heat resistance, and low birefringence. The cyclic olefin copolymer hydride of this invention is formed by hydrogenating a cyclic olefin copolymer, wherein the cyclic olefin copolymer comprises structural units from 1-naphthylnorbornene and structural units from 2-naphthylnorbornene, and the average internal bulk ratio of 1-naphthylnorbornene to 2-naphthylnorbornene is 50 mol% or more. The cyclic olefin copolymer hydride of this invention is preferably used as a material for optical components such as optical lenses.

The invention discloses a method for measuring a residual birefringence difference value of a transparent ferroelectric electro-optical material based on a Fabry-Perot resonant cavity. The method comprises the following steps: constructing a Fabry-Perot resonant cavity measuring light path consisting of a broadband light source, a polarization control assembly and a sample to be measured; the polarization state of incident light is accurately controlled through a magnetic control Faraday rotating mirror, and transmission spectrums in the o-light direction and the e-light direction are obtained respectively; a high-precision spectrum acquisition module is adopted to record transmission spectrum characteristics; based on an original spectrum processing algorithm, the residual birefringence difference value of the to-be-detected material is calculated by analyzing the resonant wavelength offset and the free spectrum range change of the o-light and e-light transmission spectrums. The method solves the problem that the weak birefringence detection capability of the existing measurement technology is insufficient, has the advantages of high measurement precision, strong anti-interference capability and the like, and is suitable for performance evaluation, process optimization and device performance improvement of the transparent ferroelectric electro-optical material.

This invention provides a reflective polarization-separating diffraction element usable over a wide wavelength range including the ultraviolet region, and an optical measuring apparatus incorporating the element. The reflective polarization-separating diffraction element comprises: a substrate (1); a reflective surface (2) formed on the surface of the substrate (1); and a grating-like structure (3) disposed on the reflective surface (2), exhibiting structural birefringence (Δn). * The grating structure (3) consists of four patterned grating structures (3A, 3B, 3C, and 3D), each with a different azimuth angle. Multiple patterned grating structures (3A, 3B, 3C, and 3D) are arranged along a predetermined direction on the reflecting surface 2 in a manner that causes the azimuth angle of the grating structure to change periodically.

A polymerizable liquid crystal composition comprising (i) a polymerizable liquid crystal compound capable of exhibiting reverse wavelength-dispersive birefringence when in an oriented state, and (ii) a polymerization initiator represented by the following formula (I), exhibits desirable high-temperature stability. A liquid crystal film that can be obtained by curing this polymerizable product is useful in the manufacture of optical devices or electro-optical devices. TIFF2026516479000062.tif30161

The invention relates to the technical field of infrared optical materials, and particularly discloses an N-type chromium-doped high-resistance infrared silicon single crystal and a preparation method thereof. The N-type chromium-doped high-resistance infrared silicon single crystal is singly doped, the doping concentration of chromium oxide is 40-160ppm, and in the preparation process, specific constant-temperature heat treatment is carried out in a cooling stage. The concentration of free carriers in the silicon single crystal is remarkably reduced by singly doping chromium oxide and utilizing the deep energy level compensation effect of chromium element, the conduction type of the single crystal is N type, the resistivity is stably increased to above 1120ohm.cm, the average infrared transmittance of the wave band of 2-6 microns is greater than 53%, the stress birefringence is less than 3nm / cm, the process window is wide, and the operation is simple and convenient. The method is particularly suitable for preparing the silicon single crystal of a large-size and high-performance infrared optical system.

The invention discloses a construction method and an evaluation method for evaluating and regulating the optical performance of a cellulose acetate film. The construction method comprises the following steps: S1, molecular modeling: carrying out molecular modeling on an acetyl substituted monomer of cellulose acetate; s2, obtaining components alpha xx, alpha yy and alpha zz of polarizability in different coordinate directions corresponding to different wavelengths; s3, constructing a function relationship between the intrinsic birefringence delta n0 (monomer) of a certain monomer of the cellulose acetate monomer and the intrinsic birefringence delta n0i of a certain conformational isomer of the monomer; s4, respectively solving the intrinsic birefringence contributions of 2, 3 and 6 acetyl groups; s5, obtaining substitution degree distribution of 2, 3 and 6 bits; and S6, constructing a CA birefringence function relationship, and solving theoretical birefringence. According to the method, a logical relationship is established between the substitution degree of hydroxyl and acetyl in each monomer conformation, the conformation ratio and the birefringence, a theoretical value that the birefringence of the cellulose acetate is closer to an actual value is obtained, and an effective method is provided for accurate prediction and regulation of optical performance.

The application provides a high-refraction cycloolefin copolymer and a preparation method thereof, and has a structure of formula I. The cycloolefin copolymer can obtain a cycloolefin copolymer resin with high thermal stability due to high steric hindrance of the cycloolefin monomer. The refractive index of the cycloolefin copolymer resin is greatly improved due to R3 and R4 on the cycloolefin monomer, and is first broken through to above 1.70, while maintaining high light transmittance of 91.0-96.0%, extremely low water absorption (<0.01%), and a glass transition temperature of 219 DEG C. The application prepares the cycloolefin copolymer resin with high activity, adjustable molecular weight and glass transition temperature by adjusting the reaction conditions. The copolymer resin has high refractive index, high light transmittance, heat resistance, low birefringence and moisture absorption, excellent fluidity, moldability and dimensional stability.

A quantitative phase contrast imaging system comprises a light source configured to generate light and to direct the light to a sample, wherein the light comprises nonlinearly polarized light; a first lens configured to receive light from the sample; a phase filter, wherein the first lens is configured to focus the light from the sample onto the phase filter, and the phase filter is configured to modulate multiple components of the nonlinearly polarized light simultaneously (e.g., geometric phase interferometry); a second lens configured to receive light from the phase filter; and a polarized camera, wherein the second lens is configured to collimate the light beam from the phase filter to the polarized camera and the polarized camera is configured to image the sample in response to the light from the phase filter. In absence of the second lens, the camera can be placed at the image plane.

The invention belongs to the technical field of stress detection, and relates to a nondestructive measurement method and system for residual stress of a basin-type insulator. The method comprises the following steps: acquiring a transverse wave acoustic elastic birefringence coefficient and a dual-frequency longitudinal wave acoustic elastic coefficient of a standard test block made of the same material as an insulator in different uniaxial stress states; obtaining the transverse wave propagation time of the polarization direction of the target point in the annular direction, the transverse wave propagation time of the polarization direction in the radial direction and the dual-frequency longitudinal wave propagation time of the insulator in the state of no external load; and acquiring circumferential residual stress and radial residual stress at the target point according to the transverse wave acoustic elasticity birefringence coefficient, the dual-frequency longitudinal wave acoustic elasticity coefficient, the transverse wave propagation time of which the polarization direction is in the circumferential direction, the transverse wave propagation time of which the polarization direction is in the radial direction and the dual-frequency longitudinal wave propagation time. Nondestructive testing of the residual stress of the epoxy resin part of the basin-type insulator is achieved, and directional analysis and independent measurement of a complex stress field are achieved.

A system for visualizing a target site in an eye using a polarization sensitive optical coherence tomography (PS-OCT) device includes a controller having at least one processor and at least one non-transitory tangible memory on which instructions are recorded. The target site is one or more vitreous opacity in vitreous fluid of the eye. The controller is configured to receive the PS-OCT data and determine, based on the PS-OCT data, at least one parameter corresponding to a birefringence characteristic of collagen fibrils in the vitreous humor. The at least one parameter includes a respective pitch of collagen fibrils. The controller is configured to determine a respective location of the one or more vitreous opacity when the at least one parameter exceeds a predefined range, and to generate a control signal adapted to direct the treatment beam at the respective location of the one or more vitreous opacity.

A resin film for an optical film, the resin film containing a (meth) acrylate polymer and a carboxylic acid amide compound having an aromatic ring, the carboxylic acid amide compound being contained in an amount of 1000 ppm or more and 11000 ppm or less with respect to the (meth) acrylate polymer, the carboxylic acid amide compound being contained therein in the form of a crystal, and the (meth) acrylate polymer being a polymer having an aromatic ring. The crystal exhibits negative birefringence. Furthermore, a method for producing a resin film for an optical film, said method comprising a step for mixing a (meth) acrylate polymer and a carboxylic acid amide compound having an aromatic ring at a ratio of 1000 ppm to 11000 ppm (inclusive) with respect to the (meth) acrylate polymer; heating to a temperature not less than the softening temperature of the (meth) acrylate polymer and not more than the decomposition temperature of the (meth) acrylate polymer, and molding; and forming a thin film by cooling.

This application relates to the field of optical polarization measurement technology, specifically to a wide-spectrum, high-bandwidth static spectral modulation Stokes polarization measurement device, comprising a polarization modulation module, a spectral sampling module, and a high extinction ratio polarizer. The polarization modulation module includes a phase retarder and a linear polarizer; the spectral sampling module has sub-nanometer spectral resolution; the high extinction ratio polarizer includes a halogen tungsten lamp and a Glan Taylor prism for generating high-purity linearly polarized light; the obtained demodulation factor and the modulation spectrum acquired by the spectral sampling module are used to invert the Stokes parameters using zero-heterodyne coherent demodulation technology. This application employs a phase retarder with high birefringence, which, for the same thickness, produces an optical path difference tens of times greater than that of quartz, increasing the Stokes polarization measurement bandwidth by a factor of the response and improving the measurement accuracy of polarization spectral parameters. Simultaneously, the zero-heterodyne coherent demodulation method is used to eliminate the dispersion interference of the phase retarder through calibration.

The application discloses a stress compensation method for balancing thermal-induced birefringence of a laser crystal, comprising the following steps: S1, fixing the crystal on a stress compensation device, and guiding a laser beam to pass through the geometric center of the crystal along the optical axis direction; the application further discloses a stress compensation system for balancing thermal-induced birefringence of a laser crystal, and the stress compensation method for balancing thermal-induced birefringence of a laser crystal, wherein the stress compensation system comprises a polarization measurement unit, a controller and a stress compensation device; the stress compensation device comprises a clamping table, the clamping table is provided with a first limiting surface and a second limiting surface which intersect and are arranged at a first set angle, and the first limiting surface and the second limiting surface combine to form a positioning structure; the polarization state of the laser beam can be detected in real time through the polarization measurement unit, and force is applied to the crystal through the stress compensation device, so that the internal stress of the crystal is more balanced, and the birefringence effect is reduced.

The invention discloses a wide-temperature-range color development stabilizing method of a liquid crystal display screen, which is characterized in that through innovative structural design and a dynamic compensation mechanism, the stability of a display bottom color is maintained in an extreme temperature range from-30 DEG C to 80 DEG C. An electric control birefringence compensation layer is additionally arranged between a lower glass substrate and a lower polaroid, and the layer is made of a polymer network stable liquid crystal material; a temperature sensor and a voltage controller are integrated in the system, the environment temperature is detected in real time, corresponding compensation voltage 0-10 V is applied to the transparent driving electrode, the effective birefringence and the optical axis direction of the compensation layer are accurately regulated and controlled, phase delay drift caused by temperature change is dynamically counteracted, and therefore the polarization effect of the polarizer is improved. And the wide-temperature-range color cast performance is optimized. Compared with the prior art, the liquid crystal display device has the advantages that the technology is fast in response, special liquid crystal materials or box thickness gradient design is not needed, and the visual quality and reliability of liquid crystal display in an extreme environment are greatly improved.

The utility model discloses a colorful optical film, a colorful transfer printing film, a colorful protective film, a colorful colored film, a colorful color-changing film, a colorful polarizing film, a colorful polarizing color-changing film, an anti-fog polarizing color-changing colorful film and other optical films which are all provided with colorful coatings as bases, can replace the existing electroplating technology, and has the beneficial effects brought by electroplating. And meanwhile, the defects of an electroplating process can be overcome, the production efficiency is improved, and energy conservation and emission reduction are achieved. The working principle of the colorful film is based on the anisotropy and birefringence optical performance of liquid crystal and the Bragg reflection principle, multi-layer superposition interference color development is achieved, and therefore the lower the transmittance of the ground color is, the better the colorful color development effect is.

The invention belongs to the technical field of optical material testing, and discloses a birefringence two-dimensional distribution testing system which comprises a laser, a polarizer, a beam expander, a 1 / 4 wave plate, a sample and a polarization camera which are sequentially and coaxially arranged from front to back in the light path direction. Light emitted by the laser generates linearly polarized light through the polarizer, the linearly polarized light is expanded to a required size through the beam expander, the 1 / 4 wave plate converts the linearly polarized light into circular polarized light, emergent light of the circular polarized light is elliptically polarized light after passing through a sample, the polarization camera measures the polarization state of the emergent light of the sample, the deflection angle reflects the refractive index principal axis direction, and the polarization degree reflects the birefringence. The optical path is simple in structure and easy to operate, and the testing efficiency can be greatly improved.

This invention relates to the field of materials analysis technology, specifically to a method for analyzing and identifying shale thin sections using a combination of optical microscopy and field emission scanning electron microscopy. First, from an optical perspective, the method combines the brightness distribution of bright-field images of shale thin sections with the birefringence deviation of cross-polarized images to determine mineral discrimination indices representing atomic number proxies. Then, based on the distribution of the mineral discrimination indices and the surface undulations of the shale thin sections, different biases are applied, and the positional bias vector is determined by combining this with the gray-level gradient distribution. Finally, based on the physical distance scale of the image and the pixel coordinate transformation process involving rotation and translation, the positional bias vector is used to determine the electron microscope stage coordinates corresponding to each pixel point for more accurate cross-scale positioning. This improves the accuracy of cross-scale positioning using optical microscopy and field emission scanning electron microscopy, significantly enhancing the reliability of shale thin section analysis and identification.