196 results about "Polarization splitter" patented technology

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 invention discloses an inclined wave surface sub-aperture stitching interference detection method based on a spatial light modulator, and relates to the field of optical detection. Light emitted by the laser is collimated and expanded and then enters the polarizing beam splitter; the reflected light is used as a reference light beam, and the transmitted light is used as a test light beam; a test light beam enters the spatial light modulator, is subjected to phase modulation by the spatial light modulator, passes through the lens and then forms standard spherical waves with different inclination angles, and zero detection is carried out on sub-apertures divided in different regions. The spatial light modulator is used as an ideal point source array generator to be matched with the imaging lens, so that required ideal inclined spherical waves can be generated according to different parameters of a measured piece, and compared with a traditional point source generator, the device has high universality. And for a large-aperture complex curved surface, sub-aperture splicing can be realized without moving an interference device, and errors caused by mechanical movement are reduced.

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.

Provided is an optical communication system comprising a polarization-diversity optical power supply capable of supplying light over a non-polarization-maintaining optical fiber to a polarization-sensitive modulation device. In an example embodiment, the polarization-diversity optical power supply operates to accommodate random polarization fluctuations within the non-polarization-maintaining optical fiber and enables an equal-power split at a passive polarization splitter preceding the polarization-sensitive modulation device.

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 invention provides an inter-satellite laser communication imaging and calibration integrated method and system. The system comprises a primary mirror, a secondary mirror, a narrow-band filter, an optical imaging and calibration integrated module, an imaging and calibration control module, a laser communication transmitting module, a transmitting fast reflecting mirror, a polarizing beam splitter, a beam splitter, a receiving fast reflecting mirror and a laser communication receiving module. The optical imaging and calibration integrated module performs star imaging and data processing, and corrects star imaging and calibration; scanning and imaging the uncertain area; processing to obtain target and background characteristics; and the laser communication terminal performs bidirectional capture locking, starts communication and transmits data. According to the invention, inter-satellite laser communication, imaging and calibration are integrated, the imaging and calibration time is shortened, the size and weight of the terminal are reduced, visible light image information of a target and a background environment and the pointing error of a calibration device are obtained, an uncertain capture area of the laser communication terminal is reduced, the laser communication link establishment speed is improved, and the communication efficiency is improved. And high-speed inter-satellite laser communication is realized.

Provided is an optical communication system comprising a polarization-diversity optical power supply capable of supplying light over a non-polarization-maintaining optical fiber to a polarization-sensitive modulation device. In an example embodiment, the polarization-diversity optical power supply operates to accommodate random polarization fluctuations within the non-polarization-maintaining optical fiber and enables an equal-power split at a passive polarization splitter preceding the polarization-sensitive modulation device.

The invention provides a laser three-dimensional imaging system and method based on receiving and transmitting dual polarization modulation matching, and the method comprises the steps: enabling a pulse laser to transmit single-wavelength linear polarization pulse laser through a transmitting unit under the synchronous control of a transmitting unit controller, continuously rotating the laser linear polarization direction during the pulse duration, and enabling the laser linear polarization direction to be smaller than the single-wavelength linear polarization pulse laser; and finally, a laser pulse subjected to polarization modulation is emitted to a target through a laser beam expander. In the receiving unit, a telescopic optical system receives laser pulses returned from a target, the beam width is narrowed, wavelength selection is carried out through a wavelength filter, and the laser pulses pass through a polarization modulator of the receiving unit and are further decomposed to two orthogonal polarization directions through a polarization spectroscope. And the two groups of imaging objective lenses, the area array detector X and the area array detector Y are used for imaging and receiving. And finally, the digital signal processor carries out resolving processing on the digital signals obtained by the two detectors to obtain distance information of each point on the two-dimensional image plane. According to the invention, three-dimensional imaging with a longer distance, a higher resolution ratio and a higher speed is realized.

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 relates to the technical field of polarizing beam splitters, in particular to a polarizing beam splitter and a preparation method and application thereof. The polarizing beam splitter provided by the invention comprises a diamond substrate, a polarizing beam splitting film and a first metalized film layer which are positioned on the surface of one side of the diamond substrate, a broadband antireflection film positioned on the surface of the other side of the diamond substrate, and a second metalized film layer positioned on the side surface of the diamond substrate, the first metallized film layer is located at the edge position of the surface of one side of the diamond substrate. Diamond is adopted as a substrate material of the polarizing beam splitter, and the characteristic of high thermal conductivity of the diamond is utilized, so that heat generated when laser acts on a film layer and a substrate can be quickly conducted as soon as possible, and damage to the polarizing beam splitter caused by local temperature rise is relieved; the edge of the polarizing beam splitter is metalized, so that the beam splitter body and a metal tube shell or a water cooling structure can be integrally welded, and a high-reliability and low-leakage-rate vacuum sealing solution can be provided while the heat conduction efficiency is improved.

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 present disclosure provides a dual-band dual-polarization splitter connecting a cross-shaped waveguide power divider to with an E-plane waveguide magic T and an ortho-mode transition through an E / H-plane 90° curved waveguide to form a new type of coaxial waveguide ortho-mode transition, thereby implementing the structure of coaxial circular waveguide feeding in high and low frequencies at the same time, reducing the length of the high-frequency transmission line, and reducing the transmission loss. Meanwhile, the present disclosure implements dual-polarization transmission in each frequency band, and can flexibly switch between vertical polarization and horizontal polarization when the dual-polarization has been converted to the single-polarization.

The present invention belongs to an ultrashort pulse laser mode-locked oscillator. In order to solve the problem of how to achieve high-power mode-locked output of the current all-fiber all-polarization-maintaining NPR mode-locked oscillator, there is no report on the research results in this area. The realization of high-power mode-locked output is limited by the technical problems of nonlinear accumulation and pump power. The present invention proposes a high-power polarization-maintaining all-fiber mode-locked oscillator, including a fiber reflector, a polarization beam splitter, a beam combiner, a pump laser, a fiber filter and a Faraday reflector. The output end of the fiber reflector is connected to the incident end of the polarization beam splitter, and the transmission end of the polarization beam splitter is connected to the input end of the beam combiner; the angle between the polarization-maintaining optical axis of the polarization beam splitter and the beam combiner is greater than 0° and less than 45°, the pump end of the beam combiner is connected to the pump laser, the output end is connected to the input end of the fiber filter through the gain fiber, and the output end of the fiber filter is connected to the incident end of the Faraday reflector.

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 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 relates to the technical field of laser nonlinear frequency conversion, and discloses a device and method capable of realizing high repetition frequency nonlinear frequency conversion, and the device comprises a pulse light source which emits fundamental frequency light with a linear polarization state; the time domain beam splitting system is used for splitting the fundamental frequency light into 2n groups of polarized light; the repetition frequency of each beam of polarized light orthogonal in the polarization direction is 1 / 2n + 1 of the repetition frequency of the fundamental frequency light, and n is greater than or equal to 0; the nonlinear frequency conversion system enables each group of polarized light to generate two beams of signal light with the same pulse sequence; the time domain beam combining system is used for combining the generated 2n + 1 groups of signal light to obtain combined light output with the same repetition frequency as the fundamental frequency light; according to the invention, the electro-optical modulator and the polarizing beam splitter are utilized to divide the high repetition frequency fundamental frequency light into two beams of low repetition frequency pulses, and the wavelength generating nonlinear conversion is subjected to equal-time-interval beam combination through the annular reflection cavity with the delay light path, so that the low repetition frequency pulses are synthesized into the high repetition frequency pulses, and high-energy and high repetition frequency nonlinear frequency conversion is realized.

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.

A structure includes a polarization device such as a polarization splitter, a polarization combiner or a polarization splitter rotator including a waveguide having a light absorber at an end section with an at least hook shape, e.g., it can be hooked or spiral shape. The structure also includes another waveguide adjacent the stated waveguide. The hook or spiral shape acts as a light absorber that reduces undesired optical noise such as excessive light insertion loss and / or light scattering. The hook or spiral shape may also be used on supplemental waveguides used to further filter and / or refine an optical signal in one of the waveguides of the polarization device, e.g., downstream of an output section of the polarization splitter and / or rotator.

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.

The invention discloses a laser vibration meter series reciprocating type optical frequency modulation calibration device and a traceability method, and belongs to the field of photoelectric measurement. The calibration device comprises a calibrated laser vibration meter, a first acousto-optic modulator, a second acousto-optic modulator, a lens, a first sinusoidal signal source, a second sinusoidal signal source, an FM signal source, a first plane mirror, a second plane mirror, a lambda / 4 wave plate, a first polarizing beam splitter, a second polarizing beam splitter, a third polarizing beam splitter, a photoelectric detector, a data acquisition system and a lambda / 2 wave plate. The reversibility characteristic of an optical path is utilized, a linear measuring optical path structure is used, output frequency translation and modulation control of the laser vibration meter are achieved in a secondary optical frequency modulation mode of the same set of optical devices in combination with secondary optical frequency translation, and modulated laser is completely returned to the laser vibration meter in an original path. The effect of the laser Doppler effect of vibration is simulated, a calibration value of the vibration speed is obtained based on a Doppler frequency shift formula, and the calibration value is traced to the time frequency quantity of a data acquisition system.

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.