111 results about "Polarization splitter" patented technology

The multi-channel synchronous scanning optical detection system comprises a DIC light path, a PL light path, a DF light path, a bright field light source and a dark field light source. The DIC light path sequentially comprises a first camera, a polarizing beam splitter, a total reflective mirror, a DIC lens unit, a first dichroscope and a second dichroscope; the PL light path sequentially comprises a second dichroscope, a first dichroscope and a second camera; the DF light path sequentially comprises a second dichroscope and a third camera; the bright field light source irradiates the sample through part of the DIC light path; the dark-field light source directly irradiates the sample; in the working state, the sample reflects the light of the bright field light source, the reflected light returns along the DIC light path to form a first defect image, the sample receives the light of the dark field light source and excites fluorescent light, the fluorescent light forms a second defect image along the PL light path, and the light, reflected by the sample, of the dark field light source forms a third defect image along the DF light path. The multi-channel synchronous scanning optical detection system can simultaneously scan sample defects by multiple optical paths.

The invention discloses a non-diffraction laser communication terminal based on Bessel beams. The terminal comprises a beacon transmitting module, an optical antenna module, a beacon receiving module, a signal transmitting module, a signal receiving module and a light splitting module. The beacon transmitting module and the signal transmitting module respectively convert the Gaussian beam into a Bessel beam through an axicon, and the Bessel beam is output through a collimating lens; a primary mirror and a secondary mirror of the optical antenna module are mounted in an off-axis manner, so that light beams are shrunk and expanded; the light splitting module completes light path switching and light splitting through a fast reflecting mirror, a 1 / 4 wave plate, a dichroscope and a polarizing beam splitter; the beacon receiving module obtains beacon light position information through a CMOS detector, and the signal receiving module receives signal light through an APD detector. The non-diffraction characteristic of the Bessel beam is utilized, and the off-axis optical antenna and the polarization beam splitting design are combined, so that high-precision and low-loss laser communication is realized.

An electro-optic receiver includes a polarization splitter and rotator (PSR) that directs incoming light having a first polarization through a first end of an optical waveguide, and that rotates incoming light from a second polarization to the first polarization to create polarization-rotated light that is directed to a second end of the optical waveguide. The incoming light of the first polarization and the polarization-rotated light travel through the optical waveguide in opposite directions. A plurality of ring resonators is optically coupled the optical waveguide. Each ring resonator is configured to operate at a respective resonant wavelength, such that the incoming light of the first polarization having the respective resonant wavelength optically couples into said ring resonator in a first propagation direction, and such that the polarization-rotated light having the respective resonant wavelength optically couples into said ring resonator in a second propagation direction opposite the first propagation direction.

The utility model relates to a device for measuring the three-dimensional shape of a sample with non-uniform reflectivity. The device comprises a structured light illumination element DLP, a collimating lens group, a polarizing beam splitter, a 1 / 4 wave plate, a motor, a dispersion tube lens, an objective lens, an objective table for placing the sample to be measured, a focusing lens, a dichroic mirror, a first optical filter, a first camera, a total reflection prism, a second optical filter, a second camera and a microprocessor, the 1 / 4 wave plate, the motor, the dispersion tube lens, the objective lens, the objective table, the focusing lens, the first camera and the second camera are perpendicular to the same optical axis, and the structured light illumination element DLP, the polaroid and the collimating lens group are parallel to the same optical axis and are perpendicular to the optical axis reflected by a tested sample. According to the utility model, the structure is simple, the first camera and the second camera can rapidly acquire images of two wavebands of a sample with non-uniform reflectivity based on the structured light illumination element DLP, and the microprocessor rapidly measures the height difference of the sample with non-uniform reflectivity based on the images of the two wavebands.

The present disclosure describes an optical system and method of operating the optical system. The optical system includes a substrate and first and second photonic integrated circuits. The first photonic integrated circuit is positioned on the substrate. The second photonic integrated circuit is positioned on the first photonic integrated circuit. The second photonic integrated circuit receives a first optical signal that includes a first mode and a second mode. The second photonic integrated circuit includes a polarization splitter rotator, a first demultiplexer, and a second demultiplexer. The polarization splitter rotator separates the first optical signal into a second optical with the first mode and a third optical signal with the first mode. The first and second demultiplexers separate the second and third optical signals into first and second pluralities of optical signals. The first and second pluralities of optical signals couple into the first photonic integrated circuit.

The invention discloses a high-precision guide rail angle swing error measuring device and method based on a pen type interference principle, and relates to the technical field of ultra-precision machining and detection. The beam splitter prism is arranged in front of the monochromatic laser, the linear polarizer is arranged between the beam splitter prism and the monochromatic laser, the two cube-corner prisms are arranged on a reflection light path and a transmission light path of the beam splitter prism, the half-wave plate is arranged on an emergent light path of the beam splitter prism, the polarizing beam splitter is arranged behind a light path of the half-wave plate, and the quarter-wave plates are arranged on the reflection light path and the transmission light path of the polarizing beam splitter respectively. One light path is selected as a laser emergent window direction to arrange the plane optical flat, the reference mirror is arranged on the other light path, the Fourier lens is arranged on an emergent light path of the polarizing beam splitter, and the photoelectric detector is arranged on a focal plane. The angle swing error of the guide rail can be measured in real time in place, the measurement resolution not lower than 5 arc seconds and the RMS repeated measurement precision of 10 nm are achieved, the overall structure is simple, and installation, adjustment and maintenance are convenient.

Disclosed in the embodiments of the present application is a spatial beam combining method for semiconductor laser modules. The method comprises: acquiring a first radius of curvature of a second lens and a second radius of curvature of a third lens to determine a first adjustment instruction and a second adjustment instruction; on the basis of the first adjustment instruction and the second adjustment instruction, adjusting the second lens and the third lens; controlling a first light beam emitted by a first semiconductor laser chip to be transmitted into a polarizing beam splitter via a first lens and the adjusted second lens; and controlling a second beam emitted by a second semiconductor laser chip to be transmitted into the polarizing beam splitter successively via the first lens, the adjusted third lens and a reflector, such that by means of the polarizing beam splitter, the first light beam and the second light beam are polarization-combined into a third optical path to form a third light beam, the third light beam being coupled into an optical fiber via a fourth lens.

The embodiment of the invention relates to an optical scanner. The optical scanner comprises a polarizing beam splitter, a wave plate and an optical phased array chip. Wherein the polarizing beam splitter is used for dividing incident light source light into first laser with a first polarization state and non-working light with a second polarization state, reflecting the first laser and transmitting the non-working light, and the first polarization state is different from the second polarization state. The wave plate is located on the reflection light-emitting side of the polarizing beam splitter and used for receiving the first laser and emitting second laser with a third polarization state different from the first polarization state and the second polarization state. And the optical phased array chip is used for receiving the second laser and emitting reference light, and the optical phased array chip is also used for changing the emitting angle of the reference light. The embodiment of the invention further relates to a laser detection system with the optical scanner and an automatic driving vehicle applying the laser detection system.

According to the single-beam miniaturized triaxial SERF atom magnetometer, through a compact and reasonable internal light path design, incident light introduced by a single light source is divided into two beams of pump light which are perpendicular to each other and are spatially separated through a designed combined polarization splitting prism, and then the two beams of pump light act on different atom ensembles through the same alkali metal gas chamber, so that the single-beam miniaturized triaxial SERF atom magnetometer is obtained. The device can effectively improve the crosstalk problem of simultaneous measurement of three-axis magnetic fields, has the characteristics of low cost, high space utilization rate, high reliability, high stability, easiness in miniaturization and the like, and is characterized by comprising Y-axis circular polarization pump light penetrating through an alkali metal gas chamber in the positive direction of the Y axis and Z-axis circular polarization pump light penetrating through the alkali metal gas chamber in the negative direction of the Z axis, and the Y-axis circular polarization pump light and the Z-axis circular polarization pump light are in a spatial separation state in the alkali metal gas chamber.

The application discloses a laser converging system, a laser welding system and a laser welding machine, and relates to the technical field of optical converging. The laser converging system converts the preset S polarization laser beams sent by a laser device into two S polarization beams, and then into two P polarization beams through a plane mirror, an S polarization beam splitter, a first controlled mirror and a second controlled mirror arranged in the same XY plane, and converges the first light path and the second light path corresponding to the two P polarization beams at a preset space point outside the XY plane, so that the imaging light path for observing the converging conditions of the P polarization beams is designed outside the XY plane where the laser transmission light path is located, the mutual interference between the laser transmission light path and the imaging light path is avoided, and the control precision of the laser convergence is improved.

This invention relates to a real-time monitoring device for yarn vibration characteristics based on laser imaging, comprising: a laser for emitting laser light to form a laser beam; a first polarizing beam splitter for orthogonally decomposing the laser beam into a measurement beam and a reference beam according to the polarization state of the laser; a measurement imaging optical path for measuring the yarn under test using the measurement beam and reflecting the measurement beam passing through the area where the yarn under test is located through a reflector to form an echo beam carrying the characteristic information of the yarn under test; a reference illumination optical path for constructing a uniform and stable background illumination reference beam; a beam splitter for combining the echo beam and the background illumination reference beam to obtain a combined beam; an area array camera for acquiring the combined beam; and an image processing system connected to the area array camera for performing image processing on the acquired combined beam to obtain the vibration characteristics of the yarn. This invention can accurately capture and quantify the vertical vibration characteristics of the yarn.

A method (100) for filtering noise in a signal, the method performed by a transmitter, a first device, and a second device in a telecommunications network. The method comprises the transmitted splitting the signal into a first and a second part and transmitting the first and second part to the first and second device. The first device passes the first part through a polarization rotator configured using a key shared with the second device. The key comprises indications for which polarization to select for each segment of the first part of the signal. The first device passes the first part through a first polarization splitter, the first polarization splitter configured using the key. The second device passes the second part through a second polarization splitter, wherein the second polarization splitter is configured using the key. A delay element is used to synchronize the first and second device.

To reduce partial deterioration of polarization transmission characteristics in a reflection polarization optical element composed of a curved substrate.SOLUTION: The reflective polarizing optical element includes a substrate having a curved surface part in which a surface forms a curved surface, and when viewed in a plan view in an optical axis direction, the curved surface part has a shape surrounded by a plurality of arcs each forming a part of the same circle in the plan view and a line connecting ends of adjacent arcs of the plurality of arcs, and a reflective polarizing film for a polarizing beam splitter having a wire grid structure, in which the shortest diameter among diameters passing through a center point of the circle in the plan view is defined as a short diameter.SELECTED DRAWING: Figure 1

A dynamic 3D light scattering particle size distribution measurement device includes a polarization splitter for generating an s laser beam with perpendicular polarization and a p laser beam with parallel polarization that travels parallel to and spaced apart from the s laser beam. A lens is used to focus the s laser beam and the p laser beam onto a common focus area inside a sample holder holding a sample whose particle size is to be measured. An s light intensity detector measures a time-resolved s light intensity from s backscattered light from the focus area. An s-polarisation filter allows perpendicularly polarized light to pass, resulting in s measuring light, and includes a light detector for time-resolved intensity measurements of the s measuring light. A p light intensity detector measures a time-resolved p light intensity detects p backscattered light from the focus area, and includes a p polarization filter that allows parallel polarized light to pass. A light detector provides for time-resolved intensity measurement of the p measuring light, and an evaluation unit automatically calculates the particle size distribution from the time-resolved p light intensity and the time-resolved s light intensity.

A method (100) for filtering noise in a signal, the method performed by a transmitter, a first device, and a second device in a telecommunications network. The method comprises the transmitted splitting the signal into a first and a second part and transmitting the first and second part to the first and second device. The first device passes the first part through a polarization rotator configured using a key shared with the second device. The key comprises indications for which polarization to select for each segment of the first part of the signal. The first device passes the first part through a first polarization splitter, the first polarization splitter configured using the key. The second device passes the second part through a second polarization splitter, wherein the second polarization splitter is configured using the key. A delay element is used to synchronize the first and second device.

To provide an eye axial length measuring device capable of accurately measuring an eye axial length.SOLUTION: The ocular axial length measurement device 100 includes a light source 12 that emits a light beam 50, a variable focus lens 14 on which the light beam 50 emitted from the light source 12 is incident, a polarization beam splitter 16 that guides, in a first direction and a second direction, a reflected light beam 52 obtained by reflecting the light beam 50 transmitted through the variable focus lens 14 by an eye 7 of a subject, a first photodetector 18 that receives the reflected light beam 52 guided in the first direction, a second photodetector 20 that receives the reflected light beam 52 guided in the second direction, and a controller 30 that acquires a focal length of the variable focus lens 14 when the light beam 50 is focused on a cornea of the eye 7 by changing the focal length of the variable focus lens 14 based on an output of the first photodetector 18. An acquisition part 64 for acquiring the focal distance of the variable focus lens 14 when the light beam 50 is focused on the retina of the eye 70 based on the output of the second photodetector 20, and a calculation part 66 for calculating the axial length of the eye 70 by using the focal distance acquired by the acquisition part 64 are provided.SELECTED DRAWING: Figure 1

The application provides an optical scanning system, which comprises a polarization converter, a polarization beam splitter, a phase delay element and a scanning element. The polarization converter receives first light with a first polarization state and second light with a second polarization state, and is configured to convert the polarization state of the first light into the second polarization state and to emit the first light and the second light together as third light with the second polarization state. The polarization beam splitter receives and reflects the third light. The phase delay element is configured to receive the third light and emit fourth light with a third polarization state. The scanning element is configured to receive the fourth light and emit fifth light with a fourth polarization state towards the phase delay element, and is further configured to change the emission angle of the fifth light. The fifth light emitted from the scanning element is converted into scanning light with the first polarization state by the phase delay element, and the polarization beam splitter is configured to transmit and emit the scanning light. The application further provides a laser radar using the optical scanning system and a vehicle.

The invention discloses an air refractive index measurement method and device based on interference light polarization parameter detection, a dual-frequency laser emits a beam of mutually orthogonal linearly polarized light, the linearly polarized light is separated into two beams of light according to the polarization direction, and the two beams of light are respectively modulated into 45-degree linearly polarized light through a polaroid and a wave plate and are converged on a spectroscope. And then respective interference signals are formed after passing through the polarizing beam splitter, the wave plate, the vacuum cavity, the fixed mirror and the movable mirror, and are detected by the two polarimeters. The change of polarization azimuth angles of interference light is caused by performing vacuum treatment on the vacuum cavity, the difference value of the polarization azimuth angle change can be detected by the polarimeter, the refractive index of air is measured in real time by measuring the difference value change of the polarization azimuth angles of two paths of interference signals, and the measurement precision can reach 10 <-9 >. Different vacuum loop distance measurement and polarization azimuth angle measurement are combined, the measurement error introduced by the air refractive index is corrected in real time, and the measurement precision of the interferometer is improved.

Transparent optical repeater for satellite, and communication satellite including such a repeater. This transparent optical repeater, configured for onboard use on a satellite, comprises: - an optical fiber (OF) assembly; - a first optical head (OHU1); - a first low-noise optical amplifier (LNOA); - a polarization splitter and controller (PCS) comprising, for each output channel of the bandpass filter (BPF), a channel polarization splitter and controller (C-PCS); - a third high-power optical amplifier (HPOA), per output channel of the polarization splitter and controller (PCS); - a polarization combination unit (PBC), configured to recombine the respective output channels of the two optical multiplexers (HPWDM); and - a second optical head (OHU2) configured to output the optical signals from the output of the polarization combination unit (PBC). Figure for the abstract: [Fig. 4]

The application discloses a laser converging system, a laser welding system and a laser welding machine, and relates to the technical field of optical co-converging. The laser converging system converts the preset P-polarized laser beam sent by a laser into a first light path and a second light path corresponding to two P-polarized light beams through a plane mirror, a P-polarized light splitter, a first controlled mirror and a second controlled mirror arranged in the same XY plane, and converges the two light paths at a preset space point outside the XY plane, so that an imaging light path for observing the converging conditions of the P-polarized light beams can be designed outside the XY plane where the laser transmission light path is located, the mutual interference between the laser transmission light path and the imaging light path is avoided, and the control precision of the laser converging can be improved.

The application discloses a multi-channel laser scribing processing system with adjustable interval, adopts an octahedral beam splitter designed in a structure to replace a traditional polarization beam splitter, realizes efficient beam splitting, and only four optical elements are needed to complete multi-beam output, so that the optical path structure is obviously simplified, energy loss and manufacturing cost are reduced. Secondly, the controller is integrated to control a first displacement driving device (adjusting the position of incident light), a second displacement driving device (adjusting the interval between split laser beams) and a lens interval adjusting device, real-time monitoring of displacement precision is combined with a laser range finder, and the displacement amount is fed back by using the resistance change of a ball screw, so that a closed loop control is formed, continuous dynamic adjustment of the interval (Delta d) between laser beams is realized, the precision can reach the micron level, and the strict process requirement of minimizing the dead zone of perovskite batteries and the like is met.

A dual-baseline depth sensing system based on structured light includes a structured light projector, a polarized beam splitter (PBS), a phase retardation mirror, a first reflective mirror, a second reflective mirror, and a structured light sensor. The structured light projector projects a p-wave light or a s-wave light. The PBS transmits the p-wave light and reflects the s-wave light. The phase retardation mirror reflects the transmitted p-wave light to form a reverse s-wave light. The reverse s-wave is then reflected by the PBS. The first reflective mirror reflects the reflected reverse s-wave light to form a first structured light projected on an object. The second reflective mirror reflects the reflected s-wave light to form a second structured light projected on the object. The structured light sensor receives reflections from the object and correspondingly generates video data.

The utility model relates to a visible light-based optical fiber slit width detection device, which belongs to the field of detection equipment, and comprises a semiconductor laser, the semiconductor laser emits visible light to enter a convex lens, and light beams are converged through the convex lens; the converged light beams enter a half-wave plate and a polarizing beam splitter to realize separation of P light and S light and light intensity adjustment; the adjusted light beam enters a first total reflective mirror and a second total reflective mirror and enters an optical attenuator through the first total reflective mirror and the second total reflective mirror, the light beam with attenuated light intensity enters a first optical fiber collimator, and the first optical fiber collimator is connected to an optical fiber coil to realize coupling of spatial light to optical fibers; the optical fiber coil is sequentially connected with a second optical fiber collimator, a digital camera and a computer; the whole device adopts common and cheap optical elements, so that the detection cost is reduced.

The application provides a laser three-dimensional imaging system and method based on receiving and transmitting dual-polarization modulation matching, which comprises the following steps: under the synchronous control of a transmitting unit controller, a single-wavelength linearly polarized pulsed laser is emitted by a pulsed laser, the linearly polarized direction of the laser is continuously rotated during the pulse duration, and finally the polarized modulated laser pulse is emitted to a target via a laser beam expander; in a receiving unit, the laser pulse returned from the target is received by a telescopic optical system, the beam width is narrowed, wavelength selection is performed by a wavelength filter, then the laser pulse is further decomposed into two orthogonal polarization directions by a polarization beam splitter via a receiving unit polarization modulator, and is imaged and received by two groups of imaging objectives and a surface array detector X and a surface array detector Y respectively; finally, the digital signals obtained by the two detectors are processed by a digital signal processor to obtain the distance information of each point on the two-dimensional image plane. The application realizes three-dimensional imaging at a farther distance, higher resolution and faster speed.

This invention discloses a tilted wavefront sub-aperture stitching interferometric detection method based on a spatial light modulator, relating to the field of optical detection. Light emitted from a laser is collimated and expanded before being incident on a polarizing beam splitter; the reflected light serves as a reference beam, and the transmitted light as a test beam; the test beam is incident on a spatial light modulator, and after phase modulation by the spatial light modulator and passing through a lens, it forms standard spherical waves with different tilt angles, allowing for zero-position detection of sub-apertures divided into different regions. Using a spatial light modulator as an ideal point source array generator in conjunction with an imaging lens can generate the required ideal tilted spherical waves for different test parameters, offering strong versatility compared to traditional point source generators. Furthermore, for large-aperture complex curved surfaces, sub-aperture stitching can be achieved without moving the interferometric device, reducing errors introduced by mechanical movement.

The application provides a novel laser communication transmitting and receiving beam integrated monitoring system and a monitoring method, which comprises a polarization beam splitter, an attenuator, a corner cube, a beam splitter, a 1 / 4 wave plate, a liquid crystal polarization grating, a converging lens and a monitoring detector. The application can perform online real-time monitoring on the consistency of the transmitting optical axis and the receiving optical axis of the laser communication system and ensure that the laser transmitting beam accurately points to the opposite terminal. The same monitoring detector is used to monitor the transmitting beam and the receiving beam at the same time. In order to avoid the mutual influence of the imaging spots of the transmitting beam and the receiving beam, the liquid crystal polarization grating is used to separate the transmitting beam and the receiving beam according to the different polarization characteristics of the transmitting beam and the receiving beam, so as to ensure the spot position extraction accuracy, realize the high-precision pointing of the transmitting beam to the opposite laser terminal, reduce the alignment mismatch loss of the laser transmitting signal, and greatly improve the communication distance of the system.

A method according to one embodiment of the present disclosure for controlling an optical amplification device (10) of a polarization diversity configuration comprises: detecting a first optical intensity of first polarized waves from a first amplifier (102) which is disposed between a polarization splitter (121) and a polarization combiner (122); detecting a second optical intensity of second polarized waves from a second amplifier (103) which is disposed between the polarization splitter (121) and the polarization combiner (122); detecting a third optical intensity of the first polarized waves from the polarization combiner (122) in a state where the second polarized waves are not input to the polarization combiner (122); detecting a fourth optical intensity of the second polarized waves from the polarization combiner (122) in a state where the first polarized waves are not input to the polarization combiner (122); and acquiring loss of the first polarized waves from the first amplifier (102) to the polarization combiner (122) and loss of the second polarized waves from the second amplifier (103) to the polarization combiner (122) on the basis of the first optical intensity, the second optical intensity, the third optical intensity, and the fourth optical intensity.

The application relates to a HUD zoom system, which comprises a windshield arranged in front of a driver's eye viewing position, an imaging system and an imaging display area, the imaging system comprises an imaging unit, a polarization beamsplitter and a curved zoom unit, the polarization beamsplitter is arranged between the imaging unit and the curved zoom unit, light is emitted from the imaging unit, passes through the polarization beamsplitter, the polarization state P light transmits through the polarization beamsplitter and enters the curved zoom unit, the polarization state is changed to S light after being reflected by the curved zoom unit, the light passes through the polarization beamsplitter again, is reflected by the windshield and is reflected at the driver's eye viewing position, an enlarged image is displayed on the imaging display area, the curved zoom unit is connected with a driving member, the driving member drives the curved zoom unit to change the position of the curved zoom unit in the light path, and the imaging distance can be adjusted. The HUD zoom system has the advantages of compact light path, small volume and adjustable imaging distance.

An example polarization splitter and rotator device is described. In one example, an optical device includes: a splitter configured to split an optical signal into a first signal having a first polarization and a second signal having a second polarization; a polarization rotator configured to rotate the second polarization of the second signal to a third polarization; and a polarization mode converter configured to convert the third polarization of the second signal to the first polarization. In some aspects of the embodiments, the splitter can be a curved multimode interference (MMI) polarization splitter, and the polarization rotator includes an input port and an output port, where the output port is wider than the input port. The polarization mode converter can be an asymmetric waveguide tapered mode converter. The devices described herein can overcome the deficiencies of conventional devices and provide low insertion loss, flat and / or wide wavelength response, high manufacturing tolerances, and compact size.

An integrated optical diversity receiving device addresses the high power consumption problem of correcting for phase distortion and beam pointing errors in existing free-space optical communications, belonging to the field of optical communications. The invention comprises: free-space light focused by a lens is received by a multimode / few-mode optical fiber; the multiple modes of light beams received by the multimode / few-mode optical fiber enter a photon lantern; the photon lantern performs mode demultiplexing and is then coupled into a single-mode optical fiber array; each light beam in the single-mode optical fiber array enters a polarization splitter / rotator / combiner through an edge coupler; the polarization splitter / rotator / combiner separates the incoming light beams into transverse electric (TE) and transverse magnetic (TM) modes, then rotates the separated TM polarization state light to a TE polarization state; the rotated TE polarization state light is combined with the separated TE polarization state light before entering an MZI network; the MZI network is used to achieve optical coherent beam combining; and a control circuit controls the combining of the light beams in the MZI network.