52 results about "Polarization rotator" patented technology

The present disclosure is directed to a dual laser transceiver system. The dual laser transceiver system may comprise a dual laser, with the dual laser further comprising a first laser chip and a second laser chip, a polarization rotator and a polarization combining beam splitter. The dual laser may be coupled to a photonic integrated circuit that may comprise a polarization rotator and splitter operable to general a local oscillator and a modulator signal.

A device for beam shaping of a laser beam includes a prism, a polarization rotator, and a thin-film polarizer. The prism is configured to split an incident laser beam into a first beam half and a second beam half. The first beam half is input coupled into the prism. The first beam half enters the prism at a first incidence side arranged at the Brewster angle vis-à-vis the incident laser beam. The first beam half input coupled into the prism is output coupled from the prism at an exit side of the prism at the Brewster angle. The thin-film polarizer is traversed by the first beam half output coupled from the prism. The polarization rotator rotates a polarization of the second beam half. The second beam half is reflected by the thin-film polarizer. The thin-film polarizer superimposes the first beam half and the second beam half.

The invention belongs to the field of photoelectric chips, and provides a low-loss silicon nitride optical engine chip for a triaxial fiber-optic gyroscope. The chip comprises an end face coupling area, a polarization rotation area and a beam splitting area, a low-polarization light beam from a light source is transmitted to the end face coupling area through the single-mode optical fiber and is transmitted to the silicon nitride waveguide through the input end face coupler, a TM0 mode of the silicon nitride waveguide is output and converted into a TE0 mode by the cross end of the polarization beam splitter through the polarization rotator, and the TM0 mode and a TE0 mode output by the straight-through end of the silicon nitride waveguide are combined in the heat insulation beam combiner. And the combined light is transmitted to the beam splitting area and is output through output end face couplers in the beam splitting area and the end face coupling area. Through the mode, efficient conversion from a non-working polarization mode to a main mode and high-efficiency, low-loss and high-stability light path connection are realized, inherent polarization loss of-3dB is avoided fundamentally, and a feasible scheme of an integrated, low-power-consumption and high-performance fiber-optic gyroscope is provided.

A line monitoring system can include a laser source to emit a probe signal over a first bandwidth; a polarization preserving tap to receive the probe signal and split the probe signal into a first portion and a second portion; a polarization rotator to receive the first portion and send the first portion to a transmission system; a loop tap to receive the second portion and receive a loop signal from the transmission system, wherein the loop signal is derived from the first portion; a photodetector coupled to receive an interference signal from the loop tap, wherein the interference signal is generated by mixing the loop signal with the second portion, wherein the photodetector is arranged to output a power signal based on the interference signal; and a power measurement system to measure the power signal over a second bandwidth comparable to the first bandwidth at a given measurement frequency.

A polarizer system is described. The polarizer system comprises at least one polarization beam splitter, a polarization rotator, and a beam combiner. The at least one polarization beam splitter is positioned to receive input radiation beam and to split the input radiation beam directing a first beam portion having a first linear polarization orientation along a first path and a second beam portion having a second linear polarization orientation orthogonal to said first linear polarization orientation along a second path. The polarization rotator is located along said second path and configured to rotate polarization of said beam portion to be parallel to said first linear polarization orientation. The beam combiner is configured and positioned to combine said first and second beam portions to form a common beam having said first linear polarization orientation propagating along a selected optical path.

A polarization rotator includes a bus waveguide disposed on a first layer having a longitudinal axis, a first end, and a second end, and a first upper waveguide and a second upper waveguide disposed on a second layer, above the first layer, the first upper waveguide and the second upper waveguide widening as the first upper waveguide and the second upper waveguide extend from the first end to the second end. The first upper waveguide and the second upper waveguide may also symmetrically bend toward each other and then away from each other proximate the second end.

A polarization rotator includes a bus waveguide disposed on a first layer having a longitudinal axis, a first end, and a second end, and a first upper waveguide and a second upper waveguide disposed on a second layer, above the first layer, the first upper waveguide and the second upper waveguide widening as the first upper waveguide and the second upper waveguide extend from the first end to the second end. The first upper waveguide and the second upper waveguide may also symmetrically bend toward each other and then away from each other proximate the second end.

The invention provides a near-to-eye display device and a control method, and the device comprises a display assembly which is used for emitting ray polarized light; the zooming assembly is located on a light emitting path of the display assembly and comprises a first liquid crystal polarization rotator and a liquid crystal lens, the first liquid crystal polarization rotator is used for switching and emitting incident linearly polarized light between first linearly polarized light and second linearly polarized light, the phase difference between the first linearly polarized light and the incident linearly polarized light is 0, and the phase difference between the first linearly polarized light and the second linearly polarized light is 0; the phase difference between the second linearly polarized light and the incident linearly polarized light is pi; the liquid crystal lens is located on a light emitting path of the first liquid crystal polarization rotator and used for focusing the first linearly polarized light or the second linearly polarized light emitted by the first liquid crystal polarization rotator on different focal lengths.

Integrated optical circulators that enable polarization diversity are disclosed. A photonic integrated circulator (200) can be fabricated by including multiple polarization beam splitters (220, 222) and optical polarization rotators (230, 232, 234) such that two copies of an optical signal are output at a receiver in substantially aligned polarization states. The circulator (200) can be used to facilitate bidirectional communication between photonic integrated circuit devices that are inherently polarization sensitive while reducing signal loss.

This invention relates to a photonic Nyquist folding receiver system based on polarization multiplexing, comprising: N The first laser and optoelectronic modulator, the second i The laser generates continuous light that enters the first... i Photoelectric modulator, number i The RF input port of the upper arm of the optoelectronic modulator is connected to a carrier signal, the first i The RF input port of the lower arm of the optoelectronic modulator is connected to a binary symbol sequence; N The output optical signals of the photoelectric modulators are coupled and input to two Mach-Zehnder modulators. These two modulators are then connected to the signal under test (SUT) and the SUT processed by a delay circuit, respectively. One output optical signal passes through a polarization rotator and becomes orthogonal to the polarization state of the other optical signal. The two signals are coupled by a polarization beam combiner to output an orthogonally polarized multiplexed optical signal. This signal is then separated by a polarization beam splitter, and the two orthogonally polarized signals are fed into two photodetectors and two low-pass filters for low-pass filtering. Finally, the original frequency of the SUT is obtained by analyzing the frequency and phase difference of the two low-frequency signals. This invention can accurately recover the frequency of the SUT with low structural complexity.

An optical device includes a display device emitting a light and a polarization rotator. The polarization rotator is disposed in front of a light emitting surface of the display device. The polarization rotator includes a wave plate assembly and a back polarizer. The wave plate assembly includes a first quarter-wave plate having an optical axis oriented at a first angle, a first half-wave plate having an optical axis oriented at a second angle, and a second quarter-wave plate having an optical axis oriented at a third angle, in which the first half-wave plate is between the first quarter-wave plate and the second quarter-wave plate, and the second angle is different from the first angle and the third angle. The wave plate assembly is optically coupling between the back polarizer and the display device.

The invention belongs to the technical field of millimeter wave photoelectric devices, and particularly relates to a double-line waveguide polarization rotator model design method. The method comprises the following steps: collecting polarization rotation parameters including a target rotation angle, a working frequency band and an insertion loss requirement; the method comprises the steps that simulation software is used for building a geometric model, simulating metal wires and multiple dielectric layers sequentially surrounding from inside to outside, a double-wire waveguide basic model is built, the two metal wires are parallel and not coplanar and form a waveguide structure, ports are set as optical signal input and output ends, the rotation angle and the optimal length of the metal wires are adjusted, and a three-dimensional simulation model is built; after mode analysis verification, a model entity is obtained through 3D printing, the polarization state and the polarization extinction ratio are tested, and the performance is evaluated; and finally, iterative optimization is carried out until the optimal rotation angle is obtained. The method supports flexible regulation and control of the polarization rotation angle, the influence of external factors on the performance is small, efficient and accurate control over the light polarization state can be achieved, and the method is suitable for the fields of terahertz communication, imaging and the like.

Reflective polarization rotators based on twisted nematic (TN) liquid crystal (LC) configurations may optimize achromatic performance in bright and dark states through wavelength dependencies of polarization conversion compensated by TN LC layers. Under linear achromatic input polarization, the purpose of compensation is to provide circular achromatic polarization at the reflector, which ensures achromatism of 90 degree polarization rotation at two passes. The compensation notes to maintain linear polarization at the reflector when the LC device is driven to a vertical LC director configuration. The method ensures that the performance of the polarization rotator is achromatic in the driving state and the non-driving state of the LC device.

A laser radar full-polarization high-power laser source comprises a full-polarization synthesis system, the full-polarization synthesis system comprises a first laser and a second laser, a first lens and a second lens are arranged in the light emitting direction of the first laser and the light emitting direction of the second laser respectively, a polarization rotator is arranged in the light emitting direction of the first lens, and a second lens is arranged in the light emitting direction of the second lens. A first reflector plate is arranged in the light-emitting direction of the polarization rotator, the full-skew high-power laser source further comprises a polarization wave-combining prism, and the light-emitting directions of the first reflector plate and the second lens are respectively aligned with the vertical input end and the horizontal input end of the polarization wave-combining prism. The invention further discloses an installation and debugging method of the laser radar full-skewed high-power laser source. Compared with the existing design that two groups of radar amplification light paths need to be arranged independently, the design of one amplification light path is reduced, only one light amplifier needs to be used, the integration level is improved, and the cost is reduced.

The present disclosure is directed to a dual laser transceiver system. The dual laser transceiver system may comprise a dual laser, with the dual laser further comprising a first laser chip and a second laser chip, a polarization rotator and a polarization combining beam splitter. The dual laser may be coupled to a photonic integrated circuit that may comprise a polarization rotator and splitter operable to general a local oscillator and a modulator signal.

The application discloses a compact broadband polarization rotation beam splitter based on a thin film lithium niobate and a preparation method, and belongs to the technical field of integrated optical devices. The device comprises, from bottom to top, a substrate layer, a buried oxygen layer, a thin film lithium niobate layer and a dielectric film material layer; wherein the substrate layer, the buried oxygen layer and the dielectric film material layer are used for protecting the thin film lithium niobate layer; the thin film lithium niobate layer comprises a mode spot converter, a mode evolution device, a width gradually changing tapered waveguide and first and second curved waveguides. The mode spot converter, the mode evolution device, the width gradually changing tapered waveguide and the first and second curved waveguides are sequentially connected in order. The application realizes the polarization rotation beam splitting function on the thin film lithium niobate sheet, helps to realize the polarization division multiplexing technology, and has the advantages of small size, large optical bandwidth, large extinction ratio and easy integration.

An apparatus for generating ions from sample material deposited on a sample carrier comprises an ablation device (e.g. pulsed laser) for locally ablating the deposited sample material using an ablation energy burst, and an energy input device (e.g. pulsed laser) to expose the ablated sample to an input energy burst which may induce further ionisation, Ions are extracted to an ion processing apparatus (e.g. ion mobility or mass analyser) The ablation energy burst or input energy burst comprises a beam of coherent electromagnetic waves. A beam distributor 52 provides a multitude of optically parallel beam paths 54, each beam pathhaving a frequency multiplier unit 50', which are combined again to form the ablation energy burst or input energy burst All frequency multiplier units emit a uniform output frequency.The beam distributor may comprise a diffractive optical element (e.g. a linear beam divider), a refractive optical element (e.g. a microlens array), or one or more beam switches (e.g. polarisation rotator / s). The invention may may allow a reduction in the energy input per frequency multiplier unit and associated unwanted thermal effects. The invention may find use in imaging mass spectrometry using matrix-assisted laser desorption / ionisation (MALDI).

Device comprising: a photonic integrated circuit (PIC) containing multiple optical waveguides; a polarization rotator structure (301, 401) integrated in the PIC and optically coupled at a first end to at least one of the optical waveguides, wherein the polarization rotator structure (301, 401) includes: a first core structure (C2) formed in a first layer, wherein the first core structure (C2) extends from the first end to a second end of the polarization rotator structure (301, 401), and a second core structure (C1, C3) formed in a second layer located at a different depth than the first layer and close to the first core structure, wherein the first core structure (C2) and the second core structure (C1, C3) provide mode hybridization between at least two orthogonally polarized waveguide modes of the polarization rotator structure (301, 401), and wherein the first layer and the second layer are separated by a third layer comprising a material that differs from a core material of the first core structure and from a core material of the second core structure, and / or the core material of the first core structure differs from the material of the second core structure; and an optical divider structure (302, 402) integrated in the PIC and optically coupled at a first end to the second end of the polarization rotator structure (301, 401) and optically coupled at a second end to at least two of the optical waveguides, wherein the optical divider structure (302, 402) comprises: a first core structure (C2) associated with at least one of the first or second core structures of the polarization rotator structure (301, 401), and a second core structure (C1, C3) that is separated from both the first and second core structures of the polarization rotator structure (301, 401).

Apparatuses and methods for investigating the inside of a tissue cell are disclosed. Embodiments include diffusely scattering light off a target sample, producing two crossing beams from the scattered light, and using a camera to create an image from the light. Some embodiments utilize a Fourier lens and a Fresnel biprism, and optionally include a long-coherence light source, a delay plate (which can be a polarization rotator or an optical flat), and / or a beam expander. Still further embodiments utilize a diffraction grating, a spatial filter (which may include two differently sized apertures), and a Fourier lens, and optionally include differently sized apertures in the spatial filter. Some embodiments include a transparent support and illuminating the target at an oblique angle through the transparent support. Still further embodiments utilize a low-coherence light source and / or immobilizing the sample tissue using surface bonding chemistry.

The application discloses a flexible transparent broadband polarization rotator based on a metamaterial, which is composed of a patterned flexible transparent metal mesh, a flexible transparent PDMS medium substrate and a flexible transparent metal mesh as a reflecting backplane from top to bottom. The polarization rotator can convert horizontal polarization electromagnetic waves in a 9.15-18.25 GHz frequency band into vertical polarization electromagnetic waves, and convert the vertical polarization electromagnetic waves into horizontal polarization electromagnetic waves, and the conversion efficiency is as high as 90%. The FSS structure is novel, the U-shaped structure is adopted as the metamaterial structure, and in addition to the bandwidth of polarization rotation, the biggest advantage of the polarization rotator is that the structure is simple and only the most common three-layer structure can be used to realize the polarization rotation, and the novel conductive material and dielectric material are used, and excellent optical transparency and mechanical flexibility are provided.

A light generating system (1; 100) comprising: a first solid-state light source (3) configured to emit first light source light (4); a luminescent element (5) being arranged downstream of the first solid-state light source and being configured to, at least partly, convert the first light source light (4) into green-yellow converted light (6) comprising short wavelength green-yellow converted light (61) having a first centroid emission wavelength, λc1, and long wavelength green-yellow converted light (62) having a second centroid emission wavelength, λc2, where λc2 > λc1; a first dichroic mirror (7) being arranged downstream of the first solid-state light source (3), being transparent for the first light source light (4) and reflective for the long wavelength green-yellow converted light (62), and arranged to direct the first light source light in a direction towards the luminescent element (5); a second dichroic mirror (8) being arranged downstream of the luminescent element (5), and being arranged to direct the short wavelength green-yellow converted light (61) in a direction towards the luminescent element (5); the luminescent element (5) being configured to receive the short wavelength green-yellow converted light (61) and convert the short wavelength green-yellow converted light (61) into long wavelength green-yellow converted light (62); a second solid-state light source (9) configured to emit second light source light (10); a third solid-state light source (11) configured to emit short wavelength green light source light (12); a first polarizing beam splitter (15) being arranged downstream of the second solid-state light source (9) and of the third solid-state light source (11), and being transparent for the second light source light (10) and the short wavelength green light source light (12); a first diffusing element (16) configured to diffuse the second light source light (10) to provide diffuse blue light (17) and to diffuse the short wavelength 20 green light source light (12) to provide diffuse short wavelength green light (18); and a first polarization rotator element (19) being configured to rotate the polarization of the diffuse blue light (17) to provide polarization rotated diffuse blue light (20) and to rotate the polarization of the diffuse short wavelength green light (18) to provide polarization rotated diffuse short wavelength green light (21), the first polarizing beam splitter (15) further being reflective for the polarization rotated diffuse 25 blue light (20) and the polarization rotated diffuse short wavelength green light (21), wherein, in an operational mode of the light generating system the system light (2), comprises the long wavelength green-yellow converted light, the polarization rotated diffuse blue light (20), and the polarization rotated diffuse short wavelength green light (21).

The present invention relates to a lidar device (1) for detecting the environment of a vehicle, wherein the lidar device comprises the following: a laser light source (10) designed to emit laser light, an optical head (18) with an optical transmitting and receiving unit for emitting laser light into the environment and for receiving laser light reflected from the environment, and at least one detector (40, 58) designed to convert received laser light (22) into electrical signals. According to the invention, the lidar device (1) further comprises the following: a first splitter (14) for splitting the emitted laser light into a portion to be emitted (20) and a portion to be stored, an optical storage element (28), for storing the portion to be stored, a second optical splitter (32) which is designed to direct the portion to be stored, after storage, proportionally via a first optical (34) connection directly and via a second optical connection (64) via a polarization rotator (62) in the direction of the at least one detector (40, 58).

This invention discloses a quantum key distribution device, method, and key rate estimation method based on a labeled source combined with light source monitoring. In the transmitting end of the device, a first optical switch and a second optical switch simultaneously and randomly select a period of time to send a second signal light to the light source monitoring module and a first idle light to the same module, respectively. The idle light passes through a polarization rotator to obtain a second idle light with the same polarization state as the second signal light. The second signal light and the second idle light pass through a beam splitter and then enter a single-photon detector to measure the coincidence count and calculate the HOM interference visibility, thus achieving light source monitoring. This invention improves the security and confidentiality of quantum key transmission by using a labeled single-photon source combined with a three-intensity decoy state scheme and a light source monitoring scheme. By measuring the HOM interference visibility, the amount of information that may be leaked at the source end can be characterized, thereby more accurately estimating the key rate that can be extracted at the measurement end.

The invention relates to the technical field of optics, and discloses an optical polarization rotator and a polarization diversity system.The optical polarization rotator comprises a silicon waveguide layer and a silicon nitride waveguide layer which are arranged in a spaced mode in the first direction, and the first direction is perpendicular to the optical path transmission direction; in the optical path transmission direction, the c silicon waveguide layer comprises a first input waveguide, a first polarization rotation waveguide and a first output waveguide which are sequentially cascaded, the first input waveguide and the first output waveguide serve as mode converters respectively, the first input waveguide is used for inputting optical signals to the first polarization rotation waveguide, and the second input waveguide is used for outputting optical signals to the second polarization rotation waveguide. The first output waveguide is used for outputting the optical signal after mode polarization rotation; the projection of the silicon nitride waveguide layer in the first direction is asymmetric with respect to the central axis of the polarization rotation waveguide, so that the symmetry of a silicon waveguide layer device structure can be broken, the effective refractive index difference between a transverse electric mode optical signal and a transverse magnetic mode optical signal is increased, and the device length is shortened under the condition of ensuring high conversion efficiency and high bandwidth.

The application provides a light source brightness adjusting device and a light source brightness adjusting method. Without a mechanical switching device in the prior art, vibration influence on the stability of the light source brightness can be avoided. Non-polarized light with brightness to be adjusted is decomposed into first polarized light and second polarized light by a light splitting element. The polarization angle of the first polarized light is adjusted by a first polarization rotator to form third polarized light. The polarization angle of the second polarized light is adjusted by a second polarization rotator to form fourth polarized light. The P light component (or S light component) of the third polarized light and the S light component (or P light component) of the fourth polarized light are combined by a light combining element to realize the adjustment of the brightness of the light output to an objective lens system and the adjustment of different polarization degrees of the light to meet the gray scale requirement when different objects are photographed.

Provided in the present disclosure are a near-eye display device and a control method. The near-eye display device comprises: a display assembly for emitting a linearly polarized light; and a zoom assembly located on an exit light path of the display assembly and comprising a first liquid crystal polarization rotator and a liquid crystal lens, wherein the first liquid crystal polarization rotator is configured to switch and emit the incident linearly polarized light between a first linearly polarized light and a second linearly polarized light, the first linearly polarized light having a phase difference of 0 with respect to the incident linearly polarized light, and the second linearly polarized light having a phase difference of π with respect to the incident linearly polarized light; and the liquid crystal lens is located on an exit light path of the first liquid crystal polarization rotator, and is configured to focus the first linearly polarized light or the second linearly polarized light emitted from the first liquid crystal polarization rotator at different focal lengths.

The purpose of the present invention is to provide an electronic apparatus which is small in size and light in weight and has a high light utilization efficiency.　An electric apparatus according to the present invention has a display device, reflective polarization plates (41, 44), and an optical rotator (43), and can constitute a catadioptric system (30) having a high light utilization efficiency without using a half mirror. A display panel (31) capable of time division emission of R (red light), G (green light), and B (blue light) light is used as the display device, and a Faraday rotator having the function of changing the magnetic flux density of a generated magnetic field is used as the optical rotator (43). Accordingly, the rotation angle with respect to the polarized light of each of R, G, and B can be controlled, and the rotation angle of the light of each wavelength can be aligned.

A spin-orbit torque (SOT) measuring apparatus includes a photoelastic modulator (PEM) configured to periodically modulate a polarization direction of linearly polarized incident light and emit a periodically modulated light, a first polarization rotator configured to rotate a polarization direction of the periodically modulated light, a voltage generator configured to generate an AC current to a sample to which light with the rotated polarization direction is to be emitted, a prism configured to split light reflected into first light and second light having different polarization directions, a balanced detector configured to output a signal corresponding to an intensity difference between the first light and the second light, a changing circuit configured to change a frequency component to the intensity difference, and an amplitude measurer configured to measure an amplitude of a frequency component corresponding to a modulation frequency of the PEM with the changed frequency component.

The application relates to the field of quantum information, and discloses a chipped quantum random number generation device and method. The device adopts a full-chip integrated architecture, and sequentially integrates a laser chip, a plasma polarization rotator, a plasma beam splitter and a photodetector, and realizes true random number generation through a single-photon branch path scheme. The laser chip outputs single-photon-level laser, which is incident to the beam splitter after being regulated by the rotator into a polarization state suitable for beam splitting requirements; single photons randomly select transmission paths in the beam splitter based on quantum scattering effects, are emitted from two output ends respectively and are detected correspondingly; through random triggering events of two-way detection signals, binary random sequences are converted, and chipped quantum random number output is realized. The device is miniaturized and has high integration, discards traditional discrete optical elements, has the characteristics of low cost, high stability and easy batch production, and can be widely applied to on-chip quantum computing, quantum communication and miniature encryption equipment and the like.