999 results about "Linearly polarized light" patented technology

The invention provides a transmitting-receiving coaxial laser radar optical system, and relates to the technical field of laser radars. The optical system comprises a transmitting assembly, a polarization splitting prism, a quarter-wave plate, a common beam expanding lens group, a micro-lens array, a common lens and a receiving assembly which are arranged in sequence. Laser emitted by the emitting assembly enters the polarization splitting prism, and at the moment, a light beam is linearly polarized light, can pass through the polarization splitting prism and then pass through the quarter-wave plate to reach the shared beam expanding lens group to be collimated and expanded, and finally is emitted for illumination through the micro-lens array and the shared lens; the emergent laser beam is irradiated to an object to return an optical signal, and the returned optical signal is returned to the polarization splitting prism along an original optical path and is reflected into the receiving assembly to be received and processed; according to the invention, the beam splitter prism, the beam expander group and the micro lens array are shared, and the shared lenses are the same and share the lens group, so that the purpose of saving the manufacturing cost of the laser radar is achieved; the method is suitable for automobile automatic driving, distance detection and the like.

The invention relates to the technical field of laser, in particular to a dual-wavelength narrow-linewidth laser output device and method.The dual-wavelength narrow-linewidth laser output device comprises a semiconductor laser unit emitting linearly polarized light beams, and a light beam conversion lens is used for achieving conversion of semiconductor laser fast-axis light beams and semiconductor laser slow-axis light beams; the light beam conversion lens is used for collimating and compressing a semiconductor laser fast axis divergence angle, and the slow axis collimating lens is used for collimating and compressing a semiconductor laser slow axis divergence angle; the linearly polarized light beam is divided into a first light beam and a second light beam through the rectangular prism; the first light beam sequentially passes through a first volume Bragg grating, a first reflector, a half-wave plate and a polarization beam combiner; the second light beam sequentially passes through a second volume Bragg grating, a second reflector and a polarization beam combiner; the dual-wavelength narrow-linewidth semiconductor laser can solve the problems of precise regulation and control and power amplification of the central wavelength of the dual-wavelength narrow-linewidth semiconductor laser, has power expansibility, and realizes improvement of laser power by stacking a plurality of laser units in the vertical direction.

The invention provides a photoacoustic endoscopic imaging system and method based on polarized light multi-angle rotary scanning, and belongs to the technical field of photoacoustic imaging, the photoacoustic endoscopic imaging system comprises a control system, a light source system, a light path system, an endoscope probe, a data acquisition system and a data reconstruction system, the control system is connected with the light source system and the data acquisition system, and the light path system is connected with the data reconstruction system. The light source system, the light path system and the endoscope probe are sequentially connected, and the data acquisition system is respectively connected with the endoscope probe and the data reconstruction system; the light path system at least comprises a hollow servo motor and a half-wave plate, and the hollow servo motor is used for responding to the time sequence pulse signal and controlling the half-wave plate to rotate by multiple preset angles so as to adjust the polarization direction of the linearly polarized light. The hollow servo motor and the half-wave plate are combined, the polarization direction of light can be rapidly and accurately adjusted, multi-angle scanning is achieved, the imaging speed is remarkably increased, multiple images can be obtained in a shorter time, and the device is suitable for clinical scenes needing real-time feedback.

The invention discloses a surface defect detection device and method based on polarized optical dark field imaging, and belongs to the technical field of industrial defect imaging detection, the device comprises a polarization camera, an imaging lens, a polarization annular LED light source and a sample to be detected which are coaxially arranged; wherein the polarization camera and the imaging lens form a polarization imaging system, the polarization annular LED light source emits linearly polarized light with an inclination angle, and the linearly polarized light is reflected and scattered on a sample to be detected; the linearly polarized light enters the surface of a to-be-detected sample, a small amount of reflection and most of scattered light of the to-be-detected sample are collected by the imaging lens and the polarization camera through a circular hole in the center of the polarization annular LED light source, and finally imaging is achieved. The defect depth can be calculated according to the defect width and the defect inclination angle, so that the defect depth is inversed by the low-frequency linear polarization degree, and the problem that the defect depth information cannot be effectively extracted in the prior art is solved.

The invention discloses a liquid guide laser processing device and method based on double-beam phase adjustment, belongs to the technical field of laser processing, and aims to reduce the width of a laser beam. The device comprises a laser light source, a first polarization state modulator, a beam splitter, a spatial light modulator, a second polarization state modulator, a polarization beam combiner and a coupler. A laser light source emits linearly polarized light, the linearly polarized light is converted into circularly polarized light through a first polarization state modulator, then the circularly polarized light is separated into first linearly polarized light and second linearly polarized light through a light beam separator, and on a second linearly polarized light transmission light path, a spatial light modulator adjusts the marginal region phase of the circularly polarized light to enable the marginal region phase to differ from the marginal region phase of the first linearly polarized light by a half cycle. And the second polarization state modulator adjusts the polarization direction to be the same as that of the first linearly polarized light, the polarization beam combiner combines the two beams of light, the coupler couples the combined laser beams to the liquid jet flow, and the liquid jet flow acts on the workpiece to be machined, so that optimization of the diameter of the laser beams is achieved.

The invention discloses a design method of a monolithic polarization multiplexing dual-function super-structure lens device and the super-structure lens device, and belongs to the technical field of optical imaging. The designed device can respectively realize independent bright field and edge enhancement imaging functions according to the polarization state of incident light; the cross section of the nano unit forming the device is in an anisotropic C2 symmetrical shape, and the long axis and the short axis of the cross section are perpendicular to each other, so that linearly polarized light parallel to and perpendicular to the long axis in the polarization direction has independent phase delay after passing through the nano unit. A bright field and an edge enhancement imaging phase are respectively applied to a pair of orthogonal polarization states, so that the device can carry out bright field imaging in one polarization state and carry out edge enhancement imaging in the other polarization state, and the imaging efficiency can be improved under the conditions that other imaging devices are not needed and the resolution requirement is met. And dual-function imaging with relatively wide working bandwidth and relatively high imaging mode switching convenience is realized.

The invention discloses a transient absorption spectrum measurement system, method and device for polarized light, and relates to the technical field of ultrafast spectrum measurement. In the system, a laser generation device generates first laser and second laser, and the first laser is converted into left-handed circularly polarized light or right-handed circularly polarized light through a pump light polarization device to serve as pump light for exciting a sample to be detected; the first Glan prism converts the second laser into detection light which is linearly polarized in a specified direction so as to detect the sample to be detected; the first lambda / 4 wave plate is used for converting the detection light after detecting the to-be-detected sample into linearly polarized light with mutually vertical polarization; the Wollaston prism enables the linearly polarized light with mutually vertical polarization to be respectively transmitted to the measuring device along different directions; the measuring device calculates the transient absorption spectrum of the left-hand circularly polarized probe light and the transient absorption spectrum of the right-hand circularly polarized probe light. The system can simultaneously measure the transient absorption spectrums of the left-hand circularly polarized light and the right-hand circularly polarized light, so that the measurement error is reduced.

The invention discloses a phase-shifting interference measuring device and a phase-shifting interference testing method based on a liquid crystal retarder. The device comprises a short coherent light source module and a Fizeau interference measurement module. A short coherent light source in the light source module is divided into p light and s light through a polarization splitting prism, and linearly polarized light is subjected to phase modulation through a liquid crystal variable retarder. Modulated polarized light is coupled through the optical fiber coupler and enters the interference module, interference occurs in the interference cavity, and finally an interferogram is obtained by the CCD camera for calculation. According to the invention, the problem of complex installation and adjustment caused by integration of a light source and an interference system of a traditional interferometer device is solved, the situation of unstable environment caused by movement of mechanical parts in traditional phase shift is avoided, and the influence of parasitic fringes is inhibited by using the characteristics of a short coherent light source. The device utilizes the characteristics of the liquid crystal variable delayer to realize phase modulation so as to realize phase shift interference and surface shape detection. According to the phase-shifting interference surface shape measuring device, a high-precision surface shape measuring result can be obtained.

The invention provides an optical film, a polarizing plate, an image display device, and a method for selecting the optical film. An optical film having a low refractive index layer on a plastic film, the plastic film having a slow axis and a fast axis, the slow axis being an axis having a maximum in-plane refractive index, the fast axis being an axis orthogonal to the slow axis in a plane of the plastic film, and the low refractive index layer being located on a surface of the optical film. Radial polarized light enters from a surface of the optical film on the opposite side from the low refractive index layer under predetermined conditions, and a * value and b * value of the L * a * b * color system of transmitted light of the linearly polarized light are measured at 11 measurement points having different angles. On the basis of measurement at 11 measurement points, the sum of the second power of the a * difference between adjacent measurement points and the second power of the b * difference between adjacent measurement points is calculated at 10 adjacent points. In the optical film, sigma T, which represents the sum of the sums, is within a prescribed range.

The invention relates to the technical field of semiconductor photoelectronics and liquid crystal materials, in particular to a vortex light laser and a preparation method thereof. The supporting structure is arranged on the laser light source; the liquid crystal structure is arranged on the supporting structure, and the liquid crystal structure is configured to convert linearly polarized light from the laser light source into circularly polarized light and further convert the circularly polarized light into vortex light. In addition, the cholesteric liquid crystal in the liquid crystal structure can change the rotation direction of the circularly polarized light under the irradiation of the ultraviolet light source, so that the topological charge number of the vortex light can be regulated and controlled. Compared with a traditional vortex light laser, the vortex light laser has the advantages of being high in conversion efficiency, low in preparation cost, high in preparation speed, capable of tuning vortex light of orbital angular momentum, capable of conducting autonomous regulation and control on emergent light under the condition that an external electric field is not introduced, and capable of improving the utilization rate of the vortex light. The preparation process is compatible with the traditional semiconductor process, the size is small, and the integration level is high.

The present invention provides: a lens and an image display device in which ghosting is suppressed when applied to a virtual reality display device using a pancake lens; and a virtual reality display device in which ghosting is suppressed. A lens according to the present invention which has a retardation layer for converting circularly polarized light into linearly polarize light, wherein: said retardation layer includes a first optically anisotropic layer and a second optically anisotropic layer; the first optically anisotropic layer and the second optically anisotropic layer have reverse wavelength dispersibility; and at least one layer among the first optically anisotropic layer and the second optically anisotropic layer is a layer obtained by immobilizing a twist-oriented liquid crystal compound having a helical axis in the thickness direction. An image display device according to the present invention has an image display panel, an absorption-type polarizer, and said retardation layer, in this order. A virtual reality display device according to the present invention has said lens or said image display device.

The invention relates to the technical field of optical detection, in particular to an optical detection system and optical detection equipment. A first optical element for changing a bright field illumination light beam into first linearly polarized light is arranged in a light path of the bright field illumination light beam; a second optical element for changing the dark field illumination light beam into second linearly polarized light is arranged in a light path of the dark field illumination light beam, the polarization direction of the first linearly polarized light is different from that of the second linearly polarized light, and the first optical element is used for inhibiting the first stray light from being mixed into a transmission path of the first linearly polarized light; the first stray light comprises light which reaches the bright field illumination lens group after the second linearly polarized light is reflected and / or scattered; therefore, in the dark field detection process, the first stray light is prevented from being reflected by the bright field illumination lens group through the first optical element, the adverse effect of the first stray light on dark field imaging is reduced, the imaging quality and the imaging effect of dark field images are improved, and the detection efficiency and the detection accuracy are improved.

The invention relates to the field of optical measurement, in particular to a reflective interference film thickness measurement method and system for eliminating back scattering of a transparent substrate, and the method comprises the following steps: transmitting a light beam through a low-coherence-length broadband light source, and forming linearly polarized light through polarization modulation; focusing the light beam to the surface of the film through a confocal optical system; collecting reflection interference signals of the upper surface and the lower surface of the film; spatial filtering, low-coherence gating and polarization control are used for cooperatively inhibiting back scattering of the substrate. And processing the acquired interference signal, and calculating to obtain film thickness information. According to the invention, triple inhibition mechanisms are adopted for synergistic effect, and the method comprises the following steps: spatial filtering: shielding out-of-focus back reflected light through a confocal small hole; low-coherence gating: using a short coherence length to naturally suppress a reflected signal beyond a coherence range; and polarization control: further weakening stray light interference through polarization state matching, and effectively suppressing back scattering of the substrate.

The invention provides an incoherent wind measurement laser radar and an atmospheric wind speed measurement method, and the method comprises the steps: generating pulse linearly polarized light through a transmitting system, adjusting the polarization state through a light processing system, transmitting the pulse linearly polarized light to the atmosphere, and receiving and processing an echo signal reflected by atmospheric molecules; the light processing system divides the echo signal into two paths, one path is detected by a first photoelectric detector after being processed by a metastable-state barium atom frequency discriminator, and the other path is detected by a second photoelectric detector; the metastable-state barium atom frequency discriminator carries out frequency discrimination on signals by using resonance absorption characteristics of barium atoms, and the data acquisition and processing system acquires signal intensity of the first photoelectric detector and the second photoelectric detector, calculates a ratio, calculates Doppler frequency shift according to a corresponding relation between the signal intensity ratio and the Doppler frequency shift, and inverts atmospheric wind speed. In the scheme, the aerosol interference part in the atmospheric echo signal is filtered by adopting the metastable-state barium atom frequency discriminator, so that the problem that atmospheric wind field detection is easily interfered by aerosol is solved, and the accurate detection of the atmospheric wind speed is realized.

To provide an EUV mask blanks inspection device capable of effectively detecting defects in a multilayer film with irradiation other than EUV. [Solution] The EUV mask blank inspection device 11 includes a support 15 that supports an EUV mask blank 14 having a multilayer film that reflects EUV light, an optical system 22 that guides linearly polarized light beam 16a that is incident perpendicularly on the multilayer film to the EUV mask blank 14, a light receiving element that separates and receives linearly polarized light beam 16b that is reflected perpendicularly from the multilayer film, and a displacement mechanism 21 that displaces light beam 16a relative to the EUV mask blank 14.

The invention relates to full-dielectric adjustable optical tweezers based on a composite phase superlens, and belongs to the technical field of optical tweezers. Two regulation modes of geometric phase and transmission phase are integrated into a dielectric metasurface periodic structure, and a circular lens surface is combined according to a specific mapping and arrangement mode. The super lens can excite two different output electric fields under the input of linearly polarized light due to the regulation and control of a composite phase, and the two electric fields can independently exist under the input of circularly polarized light with opposite chirality. Therefore, by adjusting the polarization type of the incident light source of the super lens, free switching of multiple optical capturing modes of particles in a field can be realized. Compared with the existing optical tweezers, the control mode can be flexibly adjusted on the premise that the structure of the device is not changed, and more diversified particle capturing requirements can be met. The high-flexibility and easy-to-integrate micro-nano structure can provide powerful guarantee for the performance of a compact composite optical capturing device.

Discussed is a head-up display including a housing having an inner space, an imaging device in the inner space and to emit a first linearly polarized light in a first direction; an inner mirror spaced apart from the imaging device in the inner space and to reflect the first linearly polarized light emitted from the imaging device in the first direction; a polarization film to transmit the first linearly polarized light reflected from the inner mirror and reflect a second linearly polarized light in a second direction orthogonal to the first direction; and a phase delay mirror disposed outside the inner space and to phase-convert the first linearly polarized light transmitted through the polarization film after being reflected from the inner mirror into the second linearly polarized light so as to emit the second linearly polarized light to the polarization film.

The invention belongs to the technical field of laser spot positioning, and discloses a method and a device for extracting a spot centroid of a four-quadrant detector. A first linearly polarized light beam and a second linearly polarized light beam which are consistent in wavelength and orthogonal in polarization are generated through an emission optical system, the two linearly polarized light beams are modulated, different modulation frequencies are given to the two linearly polarized light beams, and the two linearly polarized light beams are combined into one beam of composite light to be emitted; receiving the composite light by using a receiving optical system; separating the composite light into first linearly polarized light and second linearly polarized light by using a polarization bifocus prism, and enabling the two beams of light to respectively form focuses which are staggered front and back; a four-quadrant detector is used for receiving a pre-focus light spot and a post-focus light spot, and the four-quadrant detector is arranged at the middle position of the two focuses; a signal processing system is used for processing signals output by the four-quadrant detector, and light spot centroid information is obtained through calculation. According to the invention, the weak signal detection efficiency of the four-quadrant detector is improved, and the precision of light spot position calculation is improved.

The invention discloses a femtosecond laser pulse time shaping system. The system comprises a laser, and a polarization assembly, a polarization beam splitter, a 1 / 4 wave plate and a first semi-transparent and semi-reflective mirror which are sequentially arranged along the laser direction of the laser, the polarization assembly is used for converting the initial femtosecond laser pulse generated by the laser into linearly polarized light; the polarization beam splitter is used for highly transmitting the linearly polarized light entering the polarization beam splitter and highly reflecting the linearly polarized light perpendicular to the vibration direction of the incident linearly polarized light; the polarization beam splitter, the 1 / 4 wave plate and the first half-transparent and half-reflecting mirror form a time shaping device which is used for performing time shaping on femtosecond laser; the initial femtosecond laser pulse is subjected to polarization modulation of the polarization assembly and time shaping processing of the time shaping device, and finally a double-pulse sequence is output. The time shaping system is easy to construct and has a high damage threshold value, high-power processing and light path limitation of the time shaping system can be solved, and the time shaping system has important significance in the field of femtosecond laser application.

The invention discloses an optical module, a manufacturing method thereof and a near-to-eye display device. The optical module is provided with a light-in side and a light-out side, and comprises a first lens, a partial reflector, a phase retarder, a second lens, a reflective polarizer and a light-transmitting structure. The partial reflector is arranged on the first lens close to the light incident side, the phase retarder is arranged on the first lens far away from the partial reflector side, the second lens is arranged on the phase retarder far away from the first lens side, the reflective polarizer is arranged on the second lens close to the phase retarder side, and the light transmitting structure is arranged on the reflective polarizer close to the phase retarder side. The reflective polarizer has a reflection axis direction and a transmission axis direction which are perpendicular to each other, the light-transmitting structure has a lowest refraction direction, the refractive index of the light-transmitting structure on linearly polarized light parallel to the lowest refraction direction in the lowest refraction direction is lowest, and the included angle between the lowest refraction direction and the reflection axis direction is larger than or equal to 70 degrees and smaller than or equal to 90 degrees. Therefore, the reflective polarizer has a larger reflective polarization ratio.

The invention relates to the technical field of optical precision measurement, in particular to an ultra-high time resolution camera time characteristic detection device and method, and the device comprises a laser source which is used for generating pulse laser; the polarization modulation element is arranged on an emergent light path of the laser source and is used for modulating the pulse laser into circularly polarized light; the spectroscope is arranged on an emergent light path of the polarization modulation element and is used for decomposing the circularly polarized light into a first linearly polarized light beam and a second linearly polarized light beam; the first optical path unit is used for guiding the first linearly polarized light beam to the cylindrical optical element along a fixed optical path; the second optical path unit is used for adjusting the optical path of the second linearly polarized light beam and guiding the second linearly polarized light beam to the cylindrical optical element; and the cylindrical optical element is used for receiving the first linearly polarized light beam and the second linearly polarized light beam and respectively projecting the first linearly polarized light beam and the second linearly polarized light beam to an imaging surface of a camera to be detected to form two spatially separated light spots. The objective of the invention is to improve camera time characteristic calibration precision and efficiency.

The invention discloses a single-layer metasurface near-far field asymmetric image display device and method, and relates to the technical field of metasurface optics. The metasurface is formed by periodically arranging diatomic super units composed of direction-insensitive atomic nano-columns and direction-sensitive atomic nano-columns, and asymmetric image display of a near field and a far field is achieved by decoupling polarization and phases of forward and reverse incident light. When the same linearly polarized light enters from the forward direction and the reverse direction respectively, the metasurface can generate different or the same holographic image in a far field and generate a binary image or no image in a near field, and three-channel image display (two holograms and one binary image or two binary images and one hologram) can be realized by controlling the incident light direction and the super-unit structure parameters. The method does not need a multi-layer structure, simplifies the design, expands an image display channel, and can be applied to the fields of optical anti-counterfeiting, information encryption and the like.

The invention discloses a light field display screen based on a liquid crystal polarization grating, and belongs to the field of displays. The phase source, circular polarizer, liquid crystal polarization grating, quarter wave plate and linear polarizer of the light field display screen based on the liquid crystal polarization grating are arranged in sequence, the phase source emits vertically polarized linear polarized light, the polarization state of the linear polarized light is converted into circular polarization after passing through the circular polarizer, the circular polarized light is converted into a first-order light beam and a part of the unconverted zero-order light beam through the liquid crystal polarization grating, the polarization state of the zero-order light beam is converted into linear polarization after passing through the quarter wave plate, and is filtered by the linear polarizer, the polarization state of the first-order light beam after passing through the quarter wave plate is perpendicular to the zero-order light beam, and the first-order light beam passes through the linear polarizer. Through the above design, the light field display screen can filter out the zero-order light beam without affecting the energy size of the first-order light beam, so as to achieve the purpose of improving the contrast of the light field display screen.

The invention provides a polarization adjustable spin decoupling metasurface based on a perovskite material. The metasurface is characterized in that the metasurface is of a three-layer structure, namely a perovskite and metal pattern layer (1), an intermediate dielectric layer (2) and a reflection bottom layer (3) from top to bottom in sequence. When the perovskite is in a metal state, the designed metasurface can independently adjust left-handed and right-handed circularly polarized light; when the perovskite is in an insulated state, the designed metasurface can independently adjust x and y linear polarized light; by switching the state of the perovskite, the phases of the circularly polarized light and the linearly polarized light can be regulated and controlled at the same time, so that different functions are realized. The optical metasurface designed by the invention has huge potential in a terahertz frequency band, and can be widely applied to beam shaping, holographic imaging, information encryption, super lenses and the like.

The invention belongs to the technical field of perovskite nanocrystals, and particularly relates to a method and device for regulating and controlling the coherence process of perovskite nanocrystal excitons through a magnetic field. The method comprises the steps that incident light beams of pump light and detection white light pass through perovskite nanocrystals at low temperature, a magnetic field is applied in the light propagation direction, the linear polarization eigenstate in the perovskite nanocrystals is converted into the elliptic polarization eigenstate through the magnetic field, and the elliptic polarization eigenstate approaches the circular polarization eigenstate along with increase of the magnetic field; the beat frequency dynamic learning of the perovskite nanocrystal under circular polarized light pumping-detection is gradually weakened; under the pumping-detection of linearly polarized light, the beat frequency dynamic learning of the perovskite nanocrystal is gradually enhanced; the eigenstate and beat frequency dynamics of the perovskite nanocrystal are regulated and controlled by adjusting the magnetic field intensity. According to the method, the band edge exciton eigenstate of the perovskite nanocrystal is regulated and controlled by changing the magnetic field intensity, and the change of the band edge exciton eigenstate can cause the change of the coherent state dynamics process, so that the coherent state dynamics regulation and control of the perovskite nanocrystal can be realized by regulating the magnetic field intensity.

The invention provides a laser pumping magnetometer and a control method thereof. The laser pumping magnetometer comprises a pumping light source, a collimation polarization module, an atomic gas chamber, a radio frequency coil, a photoelectric detector, an amplifier and a control module, linearly polarized light emitted by the pump light source passes through the collimation polarization module to obtain parallel circularly polarized light, the circularly polarized light passes through the atomic gas chamber, atoms in the atomic gas chamber are polarized under the action of the circularly polarized light, atomic magnetic moment generates precession in a magnetic field to be measured, and the circularly polarized light is partially absorbed by the atoms in the atomic gas chamber to obtain transmission light. The transmission light enters a photoelectric detector; the radio frequency coil is wound outside the atomic gas chamber, and the winding axial direction of the radio frequency coil is the same as the light path direction; the photoelectric detector is connected with the input end of the amplifier; the output end of the amplifier is connected with the radio frequency coil; the control module comprises a frequency measurement module, and the frequency measurement module is connected with the radio frequency coil. The problem that a traditional optical pump magnetometer is not high in measurement precision is solved.

The invention discloses a light attenuation assembly, an optical module, an optical device and related equipment. The light attenuation assembly comprises a half-wave plate, a first polarization beam splitter and a second polarization beam splitter which are sequentially arranged along a light path. The half-wave plate is used for converting the first linearly polarized light into second linearly polarized light, and the second linearly polarized light can be decomposed into third linearly polarized light and fourth linearly polarized light of which the polarization directions are perpendicular to each other; the first polarization beam splitter is used for dividing incident second linearly polarized light into third linearly polarized light and fourth linearly polarized light, reflecting the third linearly polarized light to the second polarization beam splitter, and transmitting and filtering the fourth linearly polarized light at the same time; and the second polarization beam splitter is used for reflecting and outputting the third linearly polarized light and transmitting and filtering the residual fourth linearly polarized light. Through the light attenuation assembly, the quality of the output laser beam can be improved.

The invention relates to the technical field of microscopic optical imaging, and discloses a semiconductor conductive particle detection task-oriented differential interference optical system, which comprises an objective lens group and a differential interference module, the objective lens group comprises a front group, a middle group and a rear group which are arranged in sequence; the front group is used for ensuring a large aperture angle and less introduction of spherical aberration and chromatic aberration, the middle group is used for compensating various aberrations introduced by the front group, and the rear group is used for correcting field curvature; the differential interference module comprises a Nomarski prism, a polarizer and an analyzer which are arranged in sequence; the Nomarski prism is used for splitting and combining the linearly polarized light beams; the polarization analyzer is used for converting linearly polarized light which passes through the Nomarski prism and is orthogonal in polarization direction into linearly polarized light with the same polarization direction; the system further comprises a beam splitter and a barrel lens group. According to the invention, long working distance and large numerical aperture can be realized in the visible light wave band, the light path design is optimized so as to reduce aberration introduction, and the anti-interference capability to weak signals is enhanced.

A display substrate and a display device are provided. The display substrate includes a light emitting element disposed on a base substrate, and an encapsulation layer, a connection layer, a light extraction layer, a polarization conversion layer and a polarization layer stacked sequentially at a light exiting side of the light emitting element. The light extraction layer is configured to convert at least a portion of light emitted by the light emitting element incident onto the light extraction layer into circularly polarized light with a set rotational direction to pass through the light extraction layer. The polarization conversion layer is configured to convert the circularly polarized light passing through the light extraction layer into linearly polarized light, with a polarization direction parallel to a direction of a light transmission axis of the polarization layer; the connection layer is configured to bond the light extraction layer to the encapsulation layer.

This invention relates to the field of optical imaging and detection technology, specifically providing a broadband snapshot-type polarization interferometry imaging detection system and method for breast tumors. A broadband light source illuminates a breast tumor tissue sample. The reflected signal light is collected and collimated by a pre-optical system, then sequentially passes through a first and a second ray shaping unit for two shearing and two polarization state transformations, resulting in two beams of linearly polarized light and two beams of circularly polarized light. These beams are imaged by an imaging lens to an area array detector to obtain a polarization interferogram, which is then demodulated to obtain all Stokes parameters of the breast tumor tissue sample. This invention achieves broadband snapshot imaging of breast tumors with all Stokes parameters without using an analyzer, doubling the light throughput compared to traditional polarization imaging instruments using analyzers. Furthermore, this invention has advantages such as compact structure, no moving parts, easy assembly and adjustment, and no need for image registration.