72 results about "Polarization splitter" patented technology

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.

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.

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 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.

The application discloses a kind of laser synchronous detection system and its operating method for transparent material surface / subsurface defect.The linear polarized laser emitted by laser is focused on the surface of transparent material by polarizing beam splitter, integrating sphere and lower focusing lens.Precision displacement platform drives transparent material to move, and realizes laser automatic scanning.Surface polarized light sensor acquires surface scattering signal.Subsurface defect scattering light is reflected by mirror at the bottom of transparent material, and is reflected by polarizing beam splitter.After focusing by upper focusing lens, it is collected by subsurface polarized light sensor through pinhole.Computer carries out filtering processing and real-time imaging to the collected signal, and realizes the simultaneous detection to transparent material surface and subsurface defect.The application has simple structure, can realize real-time imaging to transparent material surface and subsurface defect synchronously, and improves detection efficiency.A mirror is additionally arranged at the bottom of transparent material, reduces the influence of sample stage surface on detection, and solves the problem that material high light transmittance influences subsurface detection.

The utility model relates to the technical field of optical communication, in particular to an optical filter and optical communication equipment. The optical filter comprises a first polarization output assembly used for converting input light input from a first side into single polarized light and outputting the single polarized light, and the single polarized light has a target polarization direction; the polarizing beam splitter is located on the second side of the first polarization output assembly, the second side is opposite to the first side, and the polarizing beam splitter can transmit light in the target polarization direction and reflect light in other polarization directions; and the two comb filters are respectively positioned in two mutually vertical light emitting directions of the polarizing beam splitter, the filtering wavelength of each comb filter is adjustable, and each comb filter comprises a G-T resonant cavity. The optical filter provided by the utility model is simple in optical path and compact in structure, facilitates reduction of optical loss in an optical system, and is also easy to maintain and adjust.

A photonic integrated circuit as discussed herein may include a polarization splitter that includes a set of Brewster windows. The polarization splitter includes an input waveguide, a set of output waveguides, and an intermediate waveguide optically connecting the input waveguide to the set of output waveguides. Each Brewster window is positioned to intersect a corresponding portion of the intermediate waveguide. The polarization splitter is configured to receive input light that includes one or more wavelengths within an operating wavelength range, and to use the input light to generate polarized output light at each of the set of output waveguides. Collectively, the set of Brewster windows generates a passed beam that passes through each of the Brewster windows, as well as one or more reflected beams, each of which is reflected from a corresponding Brewster window. These beams may form the polarized output light generated by the polarization splitter.

Embodiments herein describe a PSR that includes a rotator with two layers that are separated by a dielectric layer. A first layer of the rotator includes a first waveguide formed from a lower refractive index material (e.g., SiN) while a second layer of the rotator includes a second waveguide formed from a higher refractive index material (e.g., Si). An optical signal, which can include two optical modes (e.g., TE and TM modes), is then introduced into the first layer where the TM mode is rotated. At the end of the rotator, the first waveguide (which is the same waveguide that received the optical signal) includes the optical signal which is now in the same optical mode. That is, one of the optical modes is rotated so that the light is the same type of optical mode (e.g., TE).

This invention provides a method and system for on-orbit polarization state correction of spaceborne laser signals. First, the rotation direction and pulse parameters required for switching between left- and right-hand circular polarization states are calibrated on the ground, from zero position to the default polarization state. During on-orbit operation, the motor is driven back to zero or polarity switching is performed based on the ground calibration parameters to resolve the issue of unclear rotation direction caused by command errors. To address environmental drift and accumulated errors, the characteristic of a laser corner bevel prism to reverse the rotation direction of the returning light is utilized, combined with the physical properties of orthogonally linearly polarized light from a polarization beam splitter, to fine-tune the rotating motor and monitor the energy received by the detector in real time. When the received energy reaches its peak value, it is determined to be the optimal polarization state under the current environment, achieving closed-loop circularity optimization and performance correction. This method eliminates dependence on interstellar links and effectively solves the problems of on-orbit parameter drift and multi-parameter coupling debugging of open-loop motors.

In this electronic device (for example, electronic device (101) in figure 1, wearable electronic device (200) in figure 2, and head mounted display device (300) in figure 3) comprising a light engine (for example, light engine (500) in figure 5A, light engine (900) in figure 9, and light engine (1000) in figure 10B), the light engines (500, 900) can include light sources (for example, light source (510) in figure 5A and light source (910) in figure 9) for emitting Illumination lights (for example, illumination light (501) in figure 5A and illumination light (901) in figure 9). The light engines (500, 900) are disposed in the light output direction of the light sources (510, 910), and can include: first condensing lenses (for example, first condensing lens (541) in figure 5A and first condensing lens (941) in figure 9) (collimator) that include first surfaces (5411, 9411) and second surfaces (5412, 9412) facing the light sources (510, 910); second condensing lenses (for example, second condensing lens (542) in figure 5A, and second condensing lens (942) in figure 9) that include third surfaces (5421, 9421) and fourth surfaces (5422, 9422); polarization beam splitters (PBSs) (for example, polarization beam splitter (520) in figure 5A and polarization beam splitter (920) in figure 9) disposed between the first condensing lenses (541, 941) and the second condensing lens (542); fly-eye lenses (FELs) (550, 950) that include fifth surfaces (5501, 9501) and sixth surfaces (5502, 9502) facing the fourth surfaces (5422, 9422) of the second condensing lenses (542, 942); reflective plates (551, 951) disposed on the sixth surfaces (5502, 9502) of the fly-eye lenses (550, 950); and displays (530, 930) for generating image lights on the basis of the illumination lights (501, 901). The third surfaces (5421, 9421) of the second condensing lenses (542, 942) face the polarization beam splitters (520, 920), and the illumination lights (501, 901) reflected by the reflective plates (551, 951) can be output onto the displays (530, 930) through the fly-eye lenses (550, 950) and the second condensing lenses.

To reduce the possibility of deterioration in appearance of a reflection type polarization optical element when a wire grid film is stuck to a curved surface substrate.SOLUTION: The reflective polarizing optical element includes a substrate having a curved surface portion in which a surface forms a curved surface, and when viewed in a plan view in an optical axis direction, the curved surface portion has a shape surrounded by a plurality of arcs each constituting a part of the same circle in a 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 a shortest diameter among diameters passing through a center point of the circle in a plan view is defined as a short diameter.SELECTED DRAWING: Figure 1

The invention discloses a device and a method for testing the isolation of a transmitting-receiving optical module of a laser communication system, and the method comprises the steps: transmitting a laser beam with the transmitting wavelength of the laser communication system through a communication light source, enabling the laser beam to pass through a polarizer and an adjustable optical attenuator, and carrying out the beam splitting through an optical fiber beam splitter for optical power monitoring and light beam collimation; the collimated Gaussian beam is reflected and returned through a polarization beam splitter (PBS) and a light returning device, at the moment, a small part of light penetrates through the PBS and is coupled into a receiving optical fiber through a focus lens group, and an optical power synchronous acquisition unit can monitor the interference optical power coupled into the receiving optical fiber; and finally, the isolation of the to-be-tested transmit-receive optical module is calculated through the data analysis unit, and the isolation test is completed. According to the invention, the characteristic that the PBS in the transmit-receive optical module has different performances on the transmission and reflection of the s / p polarized light is utilized, and the measurement of the high dynamic range of the isolation of the transmit-receive optical module is realized by directly comparing the power of the communication transmitted light with the power of the interference light entering the receiving optical fiber.