64 results about "Optical rotation" patented technology

An optical substrate and a display device are disclosed, relating to the field of display technology. The optical substrate includes multiple optical rotation regions and a first light-shielding region. The first light-shielding region is located between at least two adjacent optical rotation regions. The two adjacent optical rotation regions include a first optical rotation region and a second optical rotation region. The first optical rotation region is used to convert linearly polarized light with a predetermined polarization state in incident light into left-handed polarized light, and the second optical rotation region is used to convert linearly polarized light with a predetermined polarization state in incident light into right-handed polarized light. The optical substrate includes a substrate, and multiple touch electrodes and multiple touch traces disposed on one side of the substrate. The multiple touch electrodes are separated from each other and are not connected. Each touch electrode is connected to a touch trace in a one-to-one correspondence. The touch electrodes are used to detect the touch position of a touch object on the optical substrate. Furthermore, in the orthographic projection onto the substrate, the touch electrodes overlap with the optical rotation regions, and the touch traces are located within the range of the first light-shielding region.

The application provides a double-end optical lightning stroke positioning method and system applied to power overhead optical cables, and relates to the technical field of optical fiber sensing; the basic principle of positioning is to realize single-end lightning stroke positioning based on the obvious change of the polarization state of optical signals after the optical signals encounter lightning strokes; the application first uses counter-transmitted pulse polarized light to detect a single-end lightning stroke positioning point, then establishes a double-end positioning equation set to solve an actual lightning stroke positioning point, so that accurate lightning stroke positioning is realized; the application uses the Faraday optical rotation effect of lightning strokes on optical signals to realize lightning stroke positioning based on a polarized light time domain reflectometer; compared with traditional lightning stroke positioning, the application has low operation and maintenance cost, high precision, does not need wide-area accurate time synchronization, has a simple system, is convenient to install, and reduces the blind area of lightning stroke positioning.

The utility model relates to a magneto-optical isolator and laser equipment. The magneto-optical isolator comprises a polarization light splitting element which can penetrate through first polarization light and block second polarization light, and the polarization light splitting element is provided with a first area and a second area; the optical rotation device is opposite to the first area; the magnetic optical rotation element is arranged on one side, opposite to the polarization light splitting element, of the optical rotation device and is provided with a third area and a fourth area; the conduction assembly enables light rays entering the magnetic rotation element from one of the third area and the fourth area to go back and forth in the magnetic rotation element and then to be emitted out from the other one of the third area and the fourth area; light emitted from the first area is converted into one of first polarization state light and second polarization state light after passing through the optical rotation device and the magnetic optical rotation element, and light emitted from the second area is converted into the other one of the first polarization state light and the second polarization state light after passing through the magnetic optical rotation element and the optical rotation device. According to the magneto-optical isolator, the miniaturization design can be realized.

The utility model relates to the technical field of optical equipment, in particular to an output type optical isolator, which comprises an optical rotation sheet with a groove mechanism and a small-hole diaphragm. When returning light appears, the plano-convex lens converges light spots of the returning light for the first time, the small-hole diaphragm partially blocks the converged light spots, and the energy of the returning light is reduced; the biconcave lens is used for carrying out secondary convergence on the blocked light spots; the second polarization splitting prism divides the secondarily converged light spots into reverse P light and reverse S light; under the combined action of the magnetic rotation crystal and an external magnetic field, the reverse P light and the reverse S light rotate anticlockwise; the optical rotation sheet performs first clockwise rotation on the reverse P light after counterclockwise rotation, and the groove mechanism of the optical rotation sheet completely blocks the reverse S light after counterclockwise rotation; finally, the rotated reverse P light and the blocked reverse S light cannot pass through the first polarization splitting prism to be combined, so that the reverse P light and the blocked reverse S light are isolated, and the damage of the returned light to a front-end laser element is avoided.

The application provides a method and device for identifying a lesion range of a urinary system by using interference optics, and the method comprises the following steps: obtaining a polarized image corresponding to a multi-layer optical rotation tomogram by filtering through a polaroid, and generating an original polarization image containing interference fringes and tissue texture; performing line extraction, intersection removal, Gaussian mask and smoothing reconstruction processing on the original polarization image to generate an interference bright line image; according to the light and dark distribution of the interference bright line image, optical rotation calculation and Mueller matrix correction are sequentially performed to generate tissue optical rotation distribution data; and the lesion range is identified by matching the tissue optical rotation distribution data with a preset calibration sample. Through multi-wavelength orthogonal polarization interference and optical rotation accurate detection, the ability to distinguish flat lesions and inflammatory mucosa is improved from the root, and the lesion boundary identification accuracy and identification efficiency are significantly improved.

The application discloses a kind of GUI-based optical isolator parameter evaluation system and method.The system includes GUI interaction module (1), parameter input module (2), core calculation module (3) and result output module (4);The method of the application includes the following steps: S1, select evaluation mode by GUI interaction module (1), S2, by parameter input module (2) input light splitting / combination crystal parameters, optical rotatory crystal parameters, target operating wavelength λ And test temperature range t， S3, core calculation module (3) starts operation, S4, result output module (4) shows parameter value and IL-wavelength relationship curve, IL-temperature relationship curve, IS-wavelength relationship curve, IS-temperature relationship curve, and supports data export and performance evaluation.The application relates to the technical field of optical device detection, especially to an intelligent research and development design and data processing system based on industrial internet technology, which serves the optical communication and laser manufacturing industry.

The present application relates to the technical field of atomic magnetometer, and particularly relates to a laser frequency stability control method of NMOR atomic magnetometer based on optical rotation signal, which comprises the following steps: irradiating an atomic cell with linearly polarized laser to pump atoms and detecting optical rotation signal; once demodulating the optical rotation signal to obtain magnetic resonance signal; applying a fixed frequency modulation signal to the laser frequency; twice demodulating the magnetic resonance signal to obtain a demodulation signal corresponding to the laser frequency offset; and feeding back and adjusting the laser frequency according to the demodulation signal. The present application is used to reduce the influence of laser frequency drift on the magnetic resonance signal of NMOR atomic magnetometer, improve the stability of long-term work of NMOR atomic magnetometer, and reduce the system volume and system complexity.

This invention relates to the field of vacuum coating equipment, and in particular to a fully-utilized optical rotation coating umbrella frame, comprising a central output shaft, multiple connecting ribs, and multiple base supports. Multiple umbrella-shaped sections are arranged in a circular array around the central output shaft, with their inner edges overlapping the central output shaft. Multiple connecting ribs are arranged in a circular array above the multiple umbrella-shaped sections, with one end connected to the central output shaft and the other end extending to the outer edge of the umbrella-shaped section. Multiple base supports are respectively connected to the ends of the multiple connecting ribs located at the outer edge of the umbrella-shaped sections, with each base support positioned between two adjacent umbrella-shaped sections and abutting against the outer edge of the umbrella-shaped section. This design eliminates physical obstruction of the edge areas of the umbrella-shaped sections, significantly improving the coating capacity per unit time, avoiding interference from the rotating flange on the lower edge of the umbrella-shaped sections, and ensuring that the particle beam emitted by the target material at the bottom of the vacuum chamber uniformly covers the entire area of ​​the umbrella-shaped sections, overcoming the structural limitations of traditional fixed-obstruction umbrella frames.

This application relates to the field of liquid crystal display technology, specifically to a reflective liquid crystal display panel and its preparation method, and a reflective liquid crystal display device. The reflective liquid crystal display panel includes a first substrate, a liquid crystal layer, and a second substrate stacked sequentially. The raw material components of the cholesteric liquid crystal composition include nematic liquid crystal, a hydrophobic first chiral compound, and a hydrophilic second chiral compound, with opposite optical rotations between the first and second chiral compounds. A hydrophilic interface is formed on the side of one of the first and second substrates facing the liquid crystal layer. This overcomes the limitation that the theoretical reflectivity of a single optically active cholesteric liquid crystal does not exceed 50%, improving overall reflectivity and display brightness. Because the components with different optical rotations are vertically layered within the same continuous liquid crystal phase, rather than forming an independent double-layer structure through external bonding, there are no obvious independent mechanical interfaces between the layers, reducing light scattering loss and improving optical coupling efficiency.

The invention belongs to the field of blood glucose detection, and relates to a high-sensitivity blood glucose noninvasive detection method and system based on polarized terahertz photoacoustic, which combines the advantages of terahertz wave band detection and photoacoustic detection, fully utilizes the chiral characteristics of glucose molecules, and adopts polarized terahertz photoacoustic to detect the blood glucose concentration. Polarization optical rotation change information is extracted through the time domain photoacoustic signal; by selecting the characteristic absorption wave band of glucose and utilizing the difference between glucose and other blood components in chiral characteristics, the influence of water and other high-concentration ions on terahertz signals is remarkably reduced, so that the selectivity and the anti-interference capability of blood glucose detection are effectively improved; terahertz non-ionizing radiation is adopted as an excitation source, no ionizing injury risk is caused to a human body, and the device is suitable for long-term repeated detection and is expected to be popularized and applied in wearable or bedside monitoring equipment.

Transmitter, receiver, transmission chain and associated information transmission method The present invention relates to a transmitter (4), comprising: an optical modulator (14), configured to modulate an electrical signal (Sel) into an optical signal (S) comprising a first polarization along a first polarization axis and a second polarization along a second polarization axis; an optical rotation module (16), configured to generate a rotated optical signal (St) by rotating the first and second polarizations; an amplifier module (18), comprising: a polarization beam splitter, configured to separate the rotated optical signal into a first optical component along the first polarization axis and a second optical component along the second polarization axis; a first optical amplifier, configured to amplify the first optical component;a second optical amplifier, configured to amplify the second optical component; and a polarization beam combiner. Figure for the abstract: Figure 2;

According to the rock magnetism measurement method based on the ultrahigh-sensitivity three-axis magnetic field measurement device, a linearly polarized light rotation angle detection method is combined with a circularly polarized light absorption method, the ultrahigh-sensitivity three-axis magnetic field measurement device is built based on two beams of linearly polarized light and one beam of circularly polarized light, and three-axis magnetic field measurement of a rock sample to be measured can be achieved. A sample feeding system is used for controlling a sample to move in a measurement area, magnetic field responses of all measurement points of a three-axis magnetic field measurement device in the sample moving process are recorded, a machine learning model is trained through a stochastic gradient descent algorithm based on measurement data, the magnetic moment is determined through weight parameters completed through model training, and therefore measurement of the magnetism of the rock sample is achieved. A multi-channel sensor is built through the high-sensitivity magnetic field measuring device, compared with a traditional method, the magnetic field sensitivity of the device can be improved to the fT magnitude, and the substance magnetism, such as lunar soil magnetism, which is difficult to detect by a current instrument can be measured by placing a detected sample in a low-residual-magnetism environment.

This utility model relates to a low-cost integrated module for a polarization-independent optical circulator and filter, comprising a first collimator, a circulator core, and a second collimator arranged sequentially. The first collimator is a four-fiber collimator, and the second collimator is a single-fiber collimator. The circulator core consists of a first polarizing beam splitter, a half-wave plate, a Faraday rotator crystal, a second polarizing beam splitter, a first filter, a first reflector, a second filter, a second reflector, and a magnetic block. The angle between the first filter and the first reflector is α; the angle between the second filter and the second reflector is also α. This design effectively realizes the circulator and wavelength division multiplexing functions during optical signal transmission. This design not only avoids unnecessary signal reflection and loss but also enhances the isolation of the optical circulator, achieving double-stage isolation. Wavelength division multiplexing can be achieved through small-angle incident light, making the optical path layout of the device more compact.

The invention discloses a GUI (Graphical User Interface)-based opto-isolator parameter evaluation system and a GUI-based opto-isolator parameter evaluation method. The system comprises a GUI interaction module (1), a parameter input module (2), a core calculation module (3) and a result output module (4), the method comprises the following steps: S1, selecting an evaluation mode through a GUI interaction module (1), S2, inputting a light splitting / combining crystal parameter, an optical rotation crystal parameter, a target working wavelength lambda and a test temperature range t through a parameter input module (2), S3, starting operation by a core calculation module (3), and S4, calculating the evaluation mode through a GUI interaction module (1). And S4, a result output module (4) displays parameter values, an IL-wavelength relation curve, an IL-temperature relation curve, an IS-wavelength relation curve and an IS-temperature relation curve, and supports data export and performance evaluation. The invention relates to the technical field of optical device detection, in particular to an intelligent research and development design and data processing system based on an industrial internet technology, which serves the optical communication and laser manufacturing industry.

The present disclosure relates to a transmitter, including: an optical modulator, configured to modulate an electrical signal into an optical signal including a first polarization along a first polarization axis and a second polarization along a second polarization axis; an optical rotation module, configured to generate a rotated optical signal by performing a rotation of the first and second polarizations; an amplifier module, including: a polarization beam splitter, configured to separate the rotated optical signal into a first optical component along the first polarization axis and a second optical component along the second polarization axis; a first optical amplifier, configured to amplify the first optical component; a second optical amplifier, configured to amplify the second optical component; and a polarization beam combiner.

The invention provides a reflective bidirectional light-passing magneto-optical switch, which relates to the technical field of optical communication and comprises an optical fiber collimation coupling unit, a polarization beam splitting and combining unit, a polarization state regulation and control unit, a reflection unit and a magnetic field generation and control unit which are sequentially arranged along an optical path. The 45-degree half-wave plate and the Faraday optical rotation crystal are configured to regulate and control light beam polarization, and it is ensured that optical signals are accurately guided to the output end after passing through the birefringent crystal. According to the design, the input port and the output port are integrated on the same side, compared with a transmission type structure, the magneto-optical switch has the advantages of being small in size, high in material utilization rate and compact in layout, the flexibility and adaptability of the magneto-optical switch are remarkably improved, bidirectional reversible transmission of an optical path is achieved, and the application requirement for bidirectional information interaction between channels is met.

The invention belongs to the technical field of chiral molecule detection, and provides a chiral molecule detection method and system based on a terahertz photoacoustic optical rotation spectrum. According to the method, pulse terahertz light is generated through a terahertz light source and modulated into circularly polarized light through polarization to irradiate a sample, ultrasonic waves generated after the sample is absorbed are detected through the photoacoustic effect, then sound pressure information is extracted, and the optical rotation is calculated. An optical rotation spectrum is obtained through wavelength and polarization scanning, and quantitative analysis of each chiral molecular component in a mixed solution is realized in combination with a linear spectrum unmixing model. The method disclosed by the invention can work at normal temperature, effectively inhibits water background interference, has high-sensitivity and high-specificity recognition and quantification capabilities on various chiral molecules in a complex system, and is suitable for the fields of biomedicine, pharmaceutical analysis, environmental monitoring and the like.

The invention belongs to the technical field of magnetic field measurement and quantum magnetic sensing, and particularly relates to a millimetric CPT magnetometer optical path based on a magnetic rotation effect and a measurement method thereof. The polarization adjusting optical assembly is used for converting original single linear polarization polychromatic light into two beams of linear polarization polychromatic laser which are perpendicular to each other, on one hand, the original single-direction linear polarization polychromatic light can be converted into the two beams of linear polarization polychromatic light which are perpendicular to each other, and on the other hand, the optical path difference of the two beams of linear polarization polychromatic light which are perpendicular to each other can be adjusted. According to the invention, the quantum control is carried out on the interaction process of light and atoms, a better CPT interference signal is obtained, and a differential detection magnetic rotation effect signal is adopted, so that common-mode noise such as optical power in laser is effectively inhibited, the signal-to-noise ratio of a CPT resonance signal is improved, and the measurement accuracy and sensitivity of a millimetric magnetic field are improved.

This invention discloses a method and apparatus for detecting atmospheric aerosols based on quantum weak measurement, belonging to the field of atmospheric aerosol detection. The method includes the following steps: S1, preparing aerosol solutions of various concentrations and dissolving them to obtain uniformly dispersed aerosol sample solutions of various concentrations; S2, detecting the intensity difference between left-handed and right-handed circularly polarized light of the aerosol sample solutions of various concentrations; S3, calculating the optical rotation spectrum corresponding to the aerosol sample solutions of various concentrations based on the intensity difference between left-handed and right-handed circularly polarized light, combined with a quantum weak measurement theoretical model, to determine the type and concentration of aerosols through the characteristic differences in the optical rotation spectrum. By employing the above-mentioned method and apparatus for detecting atmospheric aerosols based on quantum weak measurement, and utilizing the signal amplification mechanism of quantum weak measurement, combined with the correlation between optical rotation spectrum and concentration, highly sensitive type identification and quantitative concentration detection of atmospheric VOC aerosols can be achieved.

The invention discloses an anti-interference differential polarimeter, which belongs to the technical field of optical measurement instruments, organically combines magneto-optical modulation with a polarization difference method for the first time, solves the problem of weak optical rotation signal detection in an open environment, has a lower glucose solution measurement limit of 0.020 g / mL, has greatly improved anti-interference capability compared with a traditional polarimeter, and has a wide application prospect. For solutions with different concentrations, the average error is maintained at a lower level of 3.25%, not only can light source fluctuation and ambient light interference be overcome and stable measurement be realized, but also subjective judgment of human eyes can be eliminated and objective quantitative reading can be realized. According to the invention, accurate measurement of a glucose solution in a range of 0.020-0.400 g / mL can be realized, automatic data acquisition and real-time concentration display are realized, and the system integrates electromagnetism, optics and information science, can be used as an ideal platform for college physical experiment and common physical experiment teaching, and has a wide application prospect. The method can also be popularized to measurement of physical quantities such as magneto-optical Kerr effect, weak magnetic field and micro displacement, and is wide in application prospect.

The utility model relates to the technical field of optical elements, in particular to a reflective two-stage isolator and a communication module. The reflective two-stage isolator comprises a first crystal, a second crystal, a half-wave plate, an optical rotation plate and a reflective element which are sequentially arranged along an optical path, wherein the dislocation directions of the first crystal and the second crystal are perpendicular to each other; in the X direction, the height of the half-wave plate is smaller than that of the optical rotation sheet, incident light enters the first crystal, sequentially passes through the second crystal, the half-wave plate and the optical rotation sheet and then is reflected by the reflection element, and reflected light sequentially passes through the optical rotation sheet, the second crystal and the first crystal and then is emitted; in the Y direction, the height of the half-wave plate is the same as that of the optical rotation plate, incident light enters the first crystal, sequentially passes through the second crystal, the half-wave plate and the optical rotation plate and then is reflected by the reflection element, and reflected light sequentially passes through the optical rotation plate, the half-wave plate, the second crystal and the first crystal and then is emitted. The above structure can be emitted from the same side of the first crystal along a light path so as to adapt to a special application environment.

The application discloses a Faraday optical rotation deflection angle measuring method and device, which comprises the following steps: setting a quartz glass on the propagation path of the Faraday optical rotation, determining the incident angle of the Faraday optical rotation to the quartz glass, using the quartz glass to gain the actual deflection angle of the Faraday optical rotation, the gain multiple has a corresponding relationship with the incident angle of the Faraday optical rotation to the quartz glass; imaging the Faraday optical rotation after the gain, obtaining an optical rotation image; determining the deflection angle after the gain according to the optical rotation image, and inversely deducing the actual deflection angle of the Faraday optical rotation according to the deflection angle after the gain, the incident angle of the Faraday optical rotation to the quartz glass and the corresponding relationship between the gain multiple and the incident angle of the Faraday optical rotation to the quartz glass. The application can realize reliable measurement of small-angle Faraday optical rotation.

The invention discloses an NMOR atom magnetometer three-axis magnetic field measurement method based on dual-frequency quadrature modulation, and belongs to the technical field of three-axis magnetic field vector measurement, and the method comprises the steps: S1, tuning a laser frequency, generating a linear polarization laser through employing the frequency-tuned laser, and polarizing an atom ensemble through employing the linear polarization laser; s2, applying modulation magnetic fields with different frequencies to two orthogonal axes of the light polarization plane, performing dual-frequency orthogonal modulation, generating an optical rotation response signal, performing balance differential detection on the optical rotation response signal, and outputting a differential voltage signal; s3, synchronously demodulating the differential voltage signal to obtain a three-axis signal component; s4, performing in-situ calibration of a three-axis scale coefficient to obtain a scale coefficient; and S5, according to the scale coefficient, converting each axis signal component into a three-axis magnetic field amplitude, and outputting a three-axis magnetic field vector measurement result. The method is high in measurement precision and good in real-time performance, and can be widely applied to the technical fields of biological magnetic measurement, basic physics and the like.

This invention provides a device and method for measuring and demonstrating the optical rotation of a substance based on a birefringent crystal conic interferogram. The device includes a measurement optical path module, an image processing module, and a support and fixing assembly. Both the measurement optical path module and the image processing module are mounted on the support and fixing assembly. The measurement optical path module, arranged sequentially along the laser propagation direction, comprises a laser emitting unit, a polarizer unit, a linked sample tube, an optical path beam expander unit, and a birefringent crystal. A frosted glass screen is located at the output end of the measurement optical path module. The image processing module is correspondingly positioned to the frosted glass screen and is used to acquire and process the interference pattern. This invention improves measurement accuracy through optical path optimization and software algorithms, and extends and improves it into a demonstration experimental linkage device, solving problems such as large errors, zero-point drift, and inability to distinguish optical rotation directions in traditional measurement methods.

The application belongs to the technical field of light emitting diodes, and discloses a high-polarization circularly polarized light emitting diode, a preparation method and application thereof. The circularly polarized light emitting diode comprises, from bottom to top, a bottom reflective electrode arranged on the surface of a first substrate, a light emitting unit, a top transparent electrode, and a Bragg reflection layer. The material for preparing the Bragg reflection layer is cholesteric liquid crystal. The bottom reflective electrode and the Bragg reflection layer form a Bragg-mirror reflection microcavity structure, and the Bragg reflection layer selectively reflects and outputs circularly polarized light with the same chirality. The Bragg-mirror reflection microcavity is used for chirality selection, and the microcavity structure reverses the optical rotation of light with non-target optical rotation, thereby breaking through the problem of serious light loss of a traditional external polarizer. The microcavity structure utilizes the Bragg-mirror reflection optical microcavity polarization regulation mechanism, so that the light emitting diode does not depend on the intrinsic chirality, spin polarization or special orientation of the light emitting material, and can be applied to various light emitting systems.

A system for characterizing chiral molecules including an interaction zone arranged to receive a sample of chiral molecules; a laser source arranged to emit pulsed laser radiation, the laser radiation being suitable for interacting with the molecules in the interaction zone; a polarization modulator arranged to elliptically polarize the laser radiation; an optical cavity configured to redirect the pulsed laser radiation into the interaction zone several times; a detector arranged to measure a chiroptical signal produced by the interaction between the molecules and the laser radiation; and a determiner arranged and / or programmed to determine at least the chirality of the molecules from the detected chiroptical signal.

The invention discloses a miniaturized kilowatt-level optical isolator based on an innovative magnetic circuit, and relates to the field of passive optical devices. The isolator comprises a first collimator, a second collimator, a first polarizing beam splitter, a second polarizing beam splitter, a third polarizing beam splitter, a fourth polarizing beam splitter, a first optical rotation assembly, a second optical rotation assembly, a first light absorption device, a second light absorption device and a shell. Aiming at a thermally induced birefringence compensation scheme adopting double magneto-optical crystals and a quartz optical rotation sheet, the core of the invention lies in innovation of a permanent magnet structure in an optical rotation assembly: two discrete magnetic field peak regions are constructed on an optical axis by adopting a multi-ring nesting and specific magnetizing design. On the basis, a magnetic field strategy distributed according to needs is provided, the two magneto-optical crystals are arranged at the peak value of the magnetic field to enhance the Faraday effect, and meanwhile the quartz optical rotation piece is made to avoid the middle area. The design is different from a traditional uniform field scheme, and by means of accurate distribution of magnetic energy, device miniaturization and magnetic energy efficiency improvement are achieved while high isolation and kilowatt-level power bearing are guaranteed.

The invention provides a system and a method for measuring the concentration of a solution at a rotating speed, and belongs to the technical field of solution concentration measurement. The problems that in the prior art, the solution concentration measuring process and operation are complex, the personal error is large, and the anti-interference performance is weak are solved. The device comprises a linear light source, an optical rotation tube, an optical module, a motor rotating speed driving module, an optical fiber spectrometer module, an optical platform, a guide rail and a computer, the optical rotation tube is horizontally arranged above the optical platform, and the motor rotating speed driving module is arranged at one end of the optical rotation tube and drives the optical rotation tube to rotate along the central axis of the optical rotation tube; the optical module is arranged between the linear light source and the optical rotation tube, the optical module comprises an attenuation piece and a half-wave plate, the attenuation piece and the half-wave plate are sequentially arranged between the linear light source and the optical rotation tube at intervals in the horizontal direction, and the central axes of the linear light source, the attenuation piece, the half-wave plate and the optical rotation tube are collinear. The device is mainly used for measuring the solution concentration.

The utility model relates to the technical field of optical fiber laser, concretely is a kind of device for reducing with signal same wavelength spontaneous emission light, including first collimator, polarized light prism, optical rotatory component, attenuation component and reflector being sequentially arranged along light path, and second collimator opposite with polarized light prism side face.The device for reducing with signal same wavelength spontaneous emission light, by the structure and parameter of each component of reasonable setting, utilize polarization characteristics and the mode of multiple attenuation, can effectively reduce with signal same wavelength spontaneous emission light, application test in laser radar scene shows that when not using the device, radar test signal-to-noise ratio is-3dB, signal is submerged in noise, cannot measure useful signal;After using the device, after spontaneous emission light attenuation, radar test signal-to-noise ratio reaches 18dB, has obvious improvement, significantly improves system performance, ensures the normal work of system under weak signal light scene.

The invention provides a wafer defect multi-angle equivalent detection method based on rotation invariance of light, and relates to the technical field of wafer defect detection. The method comprises the following steps: firstly, carrying out physical modeling according to a change rule of scattered light intensity generated by wafer defects under different oblique incidence angles after incident light irradiates a wafer; constructing a wafer defect image data set; secondly, designing two parallel and independent detection algorithm schemes, respectively adapting to two types of industrial scenes of real-time high throughput and high-precision detection, and constructing a corresponding network model; and finally, data enhancement and multi-task learning are carried out: corresponding network models are respectively trained for two parallel and independent detection algorithm schemes, so that wafer defect multi-angle equivalent detection is realized.