450 results about "Birefringence" patented technology

The invention relates to an error compensation method of a birefringence self-calibration laser level meter, in particular to the field of laser level meters, and aims to improve the precision of the laser level meter by combining a birefringence effect, physical modeling and neural network optimization. Firstly, temperature data are collected in real time, Kalman filtering is used for noise reduction, and accurate data are provided for physical modeling; then, through physical constraints such as a heat conduction equation and a Jones matrix, a coupling relation between the temperature gradient and optical parameter changes is established; then, dynamically optimizing the refractive index correction by using a physical information neural network to avoid an overfitting problem; and finally, calculating optical path difference compensation by using a hardware accelerator, correcting a system error in real time, and feeding back and adjusting a network weight. According to the method, the precision and the stability of the laser level meter in an environment with relatively large temperature change are effectively improved.

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.

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

The invention discloses 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.

An electronic device may include a display module that generates light and an optical system that redirects the light towards an eye box. The system may include an input coupler on a waveguide and a lens that directs the light towards the input coupler. The input coupler may include a prism having a reflective surface that reflects the light into the waveguide. The reflective surface may be curved to provide the light with an optical power. The prism may be configured to expand a field of view of the light. A birefringent beam displacer may expand the effective pupil size of the light. The lens may include lens elements that converge the light at a location between the lens elements and the waveguide. A switchable panel may be placed at the location and toggled between first and second orientations to increase the effective resolution of the light.

A system and method for performing virtual birefringence imaging and virtual staining (e.g., Congo red) of label-free human tissue is disclosed to show that a single trained neural network can rapidly transform autofluorescence images of label-free tissue into brightfield and polarized microscopy images, matching their histochemically-stained versions. Blind testing with quantitative metrics and pathologist evaluations on cardiac tissue showed that the virtually stained polarization and brightfield images highlight amyloid patterns in a consistent manner, mitigating challenges due to variations in chemical staining quality and manual imaging processes in the clinical workflow.

The invention discloses a stress compensation method for balancing thermally induced birefringence of a laser crystal, and the method comprises the steps: S1, fixing the crystal on a stress compensation device, and guiding a laser beam to pass through the geometric center of the crystal in the direction of an optical axis; the invention also discloses a stress compensation device for balancing the thermally induced birefringence of the laser crystal, the stress compensation device comprises a clamping table, the clamping table is internally provided with a first limiting surface and a second limiting surface which are intersected and arranged at a first set angle, and the first limiting surface and the second limiting surface are combined 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 relates to the technical field of optical thin films, and particularly discloses a high-birefringence laminated reflecting film and a preparation method thereof. According to the laminated reflecting film, 4, 4 '-biphenyl dicarboxylate modified PET is used as a raw material of an A layer, PMMA or PETG is used as a raw material of a B layer, the difference value of the glass transition temperatures Tg of the raw material of the A layer and the raw material of the B layer is controlled to be smaller than or equal to 5 DEG C, and the laminated reflecting film formed by alternately laminating the raw material of the A layer and the raw material of the B layer is subjected to synchronous two-way stretching and heat setting treatment; according to the application, PET is modified by the BB monomer, and a biaxial stretching process and the content of the BB monomer are regulated and controlled for the first time, so that Tg difference values of the raw materials of the layer A and the raw materials of the layer B are close, meanwhile, a refractive index difference value is increased, the reflecting film with excellent optical performance and mechanical performance can be obtained with a small number of lamination layers, and the reflecting film has high in-plane birefringence, high in-plane birefringence, high in-plane birefringence, high in-plane birefringence, high in-plane birefringence and high in-plane birefringence. And the reflectivity reaches 74% or above.

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.

The first purpose of the present invention is to provide a polycarbonate resin having excellent fluidity and small orientation birefringence. The second purpose of the present invention is to further provide, on the basis of the first purpose, a polycarbonate resin having a high Abbe number, a small orientation birefringence, and a small photoelastic coefficient. The third purpose of the present invention is to further provide, on the basis of the first purpose, a polycarbonate resin having a small orientation birefringence, a high refractive index, and a high glass transition temperature. The polycarbonate resin contains units represented by formula (1) and / or formula (2) and units represented by formula (3), and has a weight-average molecular weight Mw of 10,000-55000. (In formula (3), R1-R4 each independently represents a hydrogen atom or a hydrocarbon group having 1-10 carbon atoms)

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.

This invention discloses a method for controlling photon spin-orbit coupling in an organic alloy microcavity, belonging to the field of optical microcavity technology. This invention prepares β-type Pe by doping different amounts of DCA into Pe using a volatilization method. 1‑x DCA x An organic alloy, wherein x ≤ 20 wt%, allows for the controllability of crystal color from yellow-green to orange-red. Furthermore, this organic alloy exhibits birefringence, and its application in the fabrication of optical microcavities allows for the observation of TE-TM spin-orbit coupling and Rashba-Dresselhaus spin-orbit coupling within the microcavities. This provides a novel type of microcavity for studying the interaction between light and matter in organic alloy microcavities, and the controllability of photon spin-orbit coupling within these microcavities can be achieved by adjusting the value of x.

An object of the present invention is to provide an optical laminate which includes a reflective polarizer, an absorptive polarizer, and at least one adhesive layer, and exhibits high image sharpness in a case of being bonded to a lens or the like of a virtual reality display apparatus. The optical laminate of the present invention includes a reflective polarizer, an absorptive polarizer, and at least one adhesive layer, in which, in a case where the reflective polarizer is heated for 1 minute at a temperature higher than a glass transition temperature of the reflective polarizer by 20° C., the reflective polarizer exhibits a dimensional change of a contraction of 0% or more and less than 0.8% in at least one in-plane orientation, and the reflective polarizer is a reflective linear polarizer formed by alternately laminating two or more different types of birefringent layers.

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.

The present invention relates to the technical field of ray tracing, specifically providing a method for tracing non-sequential polarized rays in a birefringent medium. First, the birefringent medium parameters and incident light parameters are determined. Next, the wave vectors and refractive indices of the transmitted and reflected light generated after the incident light enters the birefringent medium are iteratively calculated. Singular value decomposition is then used to calculate the polarization states of the transmitted and reflected light. The propagation directions, Fresnel amplitude coefficients, transmittances, and reflectances of the transmitted and reflected light are further calculated. Finally, the propagation process and optical path length of the incident light are calculated, completing the ray tracing. The method can accurately trace non-sequential polarized rays in a birefringent medium, has strong versatility, and provides highly accurate tracing results.

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.

To provide a displacement detector with high versatility while having high measuring accuracy.SOLUTION: A displacement detector 1 includes: a light source 111; a first birefringent part 114 configured to separate light into first light L1 and second light L2 having a phase difference from the first light; a second birefringent part 121 configured to deflect the first light and the second light; a third birefringent part 123 configured to condense the first light and the second light; a fourth birefringent part 131 configured to overlap the first light with the second light; and a displacement detection part 13 configured to detect a displacement in a measurement direction of a target T according to a change in the phase difference between the first light and the second light. The second birefringent part 121 and the third birefringent part 123 is configured to change the phase difference between the first light L1 and the second light L2, along a movement of the target T in the measurement direction.SELECTED DRAWING: Figure 2

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.