199 results about "Optical isolator" patented technology

The invention relates to the technical field of laser ranging, in particular to a double-optical-comb hybrid ranging device which comprises a signal detection optical path system and a signal demodulation optical path system. Wherein the signal detection optical path system comprises a first optical frequency comb, a first optical isolator, a first optical collimator, a first beam splitter prism, a reference mirror, a Faraday rotator, a convergence mirror and a target reflector; the signal demodulation optical path system comprises a second optical frequency comb, a second optical isolator, a second optical collimator, a half-wave plate, a second beam splitter prism, a third beam splitter prism, a first polarization controller, a first photoelectric detector, a reflector, a polarization beam splitter prism, a second polarization controller and a second photoelectric detector. A third polarization controller; and a third photoelectric detector. According to the invention, three ranging technologies of asynchronous optical sampling ranging, multi-heterodyne interference ranging and synthetic wavelength ranging are fused, and the problem that a large ranging range and high ranging precision cannot be simultaneously considered in the ranging process is solved.

The present application relates to a kind of methods and applications of growing bismuth-doped rare-earth iron garnet BRIG crystal by guided mode pulling-top seed crystal method.For solving the problems of large internal stress, many defects, difficult to prepare thick film of single crystal in the current liquid phase epitaxy method of growing BRIG crystal;And the problems of long growth cycle, difficult to obtain seed crystal in top seed crystal method, the present application combines the fast growth of guided mode pulling crystal and the high-quality single crystal growth of top seed crystal method, and invents guided mode pulling-top seed crystal method to realize the fast growth of high-quality BRIG single crystal.First, the large-size doped rare-earth iron garnet crystal with high lattice matching and similar composition is quickly grown by guided mode pulling method, which is cut into centimeter-level seed crystal, and high-quality BRIG bulk single crystal is quickly grown by TSSG method.The crystal grown by this method has the advantages of small internal stress, less cracking, good uniformity, fast crystal growth, etc., and has obvious advantages in high-performance magneto-optical isolator.

The application discloses a disk medium high-energy ultra-short pulse laser regenerative amplifier based on CPA technology, comprising: a femtosecond laser seed light source for providing femtosecond seed light; a chirped Bragg fiber grating for expanding the femtosecond seed light into nanosecond laser pulses; an optical coupling input and output device for coupling input of the nanosecond laser pulses and coupling output of the nanosecond laser pulses after amplification processing; a regenerative amplification laser cavity for regenerative amplification processing of the coupled-in nanosecond laser pulses; the optical coupling input and output device comprises a fiber coupling collimation module, an optical isolator, a first 1 / 2 wave plate and a thin film polarizer; the regenerative amplification laser cavity comprises a Pockels cell, a second 1 / 2 wave plate, a first reflection module, a second reflection module, a first telescope module, a second telescope module, a first disk gain medium, a second disk gain medium and a third reflection module; the regenerative amplifier can realize high-repetition-frequency and high-pulse-energy laser pulse output.

The invention provides an optical feedback resonance enhanced forward Brillouin demodulation structure, which comprises a tunable laser, a first polarization controller, an erbium-doped optical fiber amplifier, an optical coupler, an optical isolator, a forward Brillouin gain optical fiber, a band-pass filter and a photoelectric detector, a second polarization controller; and a spectrum analyzer. The first polarization controller is connected with a port a of the optical coupler, a port b of the optical coupler is connected with an input end of the erbium-doped optical fiber amplifier, an output end of the erbium-doped optical fiber amplifier is connected with the optical isolator, the optical isolator is connected with the band-pass filter, the band-pass filter is connected with the forward Brillouin gain optical fiber, and the optical fiber is fed back to a port c of the coupler through the second polarization controller. The output power of the erbium-doped optical fiber amplifier is controlled, and the polarization states of the pump light and the feedback laser are controlled by the first polarization controller and the second polarization controller, so that the forward Brillouin effect is amplified.

This application relates to a polarization-maintaining isolator and optical device. The polarization-maintaining isolator includes a first collimator, a first polarizer, a Faraday rotator, a second polarizer, and a second collimator arranged sequentially along the optical path. The transmission axis of the first polarizer is along a first target polarization direction; the Faraday rotation angle of the Faraday rotator is equal to the target angle; the transmission axis of the second polarizer is along a second target polarization direction; the first target polarization direction, after being rotated by the target angle, is aligned with the second target polarization direction; and the second target polarization direction, after being rotated by the target angle, is perpendicular to the first target polarization direction. This application simplifies the device structure and reduces the space occupied by the device, achieving a compact design for the optical isolator.

This invention provides a cross-network interaction method and system based on the irreversible and wave properties of light, relating to the field of network security technology. The method includes obtaining modulation sensitivity factors through multi-scale decomposition, using an asymmetric modulation operator for dynamic compensation modulation to generate an optical signal carrying unique wave information, establishing a unidirectional transmission link using an optical isolator, and generating check values ​​through wave feature sequences and feature mapping matrices respectively, comparing matching degrees to determine data integrity. This invention achieves secure and efficient data interaction between heterogeneous networks, effectively preventing data leakage and tampering, and improving the security and reliability of cross-network data transmission.

The invention provides a silicon optical device and a coupling method thereof. The silicon optical device comprises a circuit board; a heat dissipation substrate, a silicon optical chip, an optical isolator and a lens unit are arranged above the circuit board, a plurality of lasers are arranged above the heat dissipation substrate, the lens unit comprises a collimating lens array, a half-reflecting mirror and a converging lens array, the collimating lens array and the converging lens array are vertically arranged, and the half-reflecting mirror is arranged above the collimating lens array. The first end of the collimating lens array is adjacent to the first end of the converging lens array, the second end of the collimating lens array is adjacent to the first end of the half-reflecting mirror, and the second end of the converging lens array is adjacent to the second end of the half-reflecting mirror; the collimating lens array directly faces the plurality of lasers, and the silicon optical chip directly faces the converging lens array. And the optical isolator is arranged between the converging lens array and the silicon optical chip. The space of the circuit board can be fully utilized, so that the packaging density is improved.

This invention provides a wind erosion monitoring system and method based on distributed optical fiber, belonging to the field of optical-based wind and sand monitoring technology. It includes: constructing a wind erosion monitoring system comprising a linearly tunable laser, an optical isolator, a first coupler, an upper branch, a lower branch, a sand particle capture sensor, a photoelectric detection and acquisition module, and a host computer; utilizing the Rayleigh scattering signal of the linearly swept laser in the sensing optical fiber and the interference with a reference light, the vibration information distributed along the optical fiber is obtained by demodulating the beat frequency signal; combining the constructed sand particle impact and optical fiber coupling model, the dynamic strain generated by sand particle impact is converted into phase changes, realizing the acquisition of sand particle impact location, sand particle size, and sand particle quantity. This invention enables continuous distributed monitoring of wind and sand flows with high spatial resolution, and has advantages such as resistance to electromagnetic interference, strong environmental adaptability, and multi-parameter sensing, and can operate stably for a long time in harsh desert environments.

This invention discloses an integrated detection device for the isolation degree of an optical isolator, belonging to the field of optical component manufacturing technology. The device includes a top connecting plate, a supporting vertical plate fixedly connected to the back of a bottom supporting plate, a top connecting plate fixedly connected to the front of the upper end of the supporting vertical plate, and a connecting pipe arranged opposite to each other detachably between the top connecting plate and the bottom supporting plate. An adjustment component is installed on the two connecting pipes below the depolarizing beam splitter prism, and an isolator is installed on the adjustment component. The isolator and the reflector are coaxial. Through the principle of dual-source independent optical path synchronous acquisition, the two light sources are transmitted through the depolarizing beam splitter prism to form a test optical path and a reference compensation optical path, respectively, and the reverse leakage power of the isolator is acquired synchronously. This avoids the light source drift and optical path loss drift errors caused by time difference in traditional single-path step measurement.

The present application relates to the technical field of measurement, in particular to a kind of spectrometer automatic calibration device and method, comprising: light source, optical isolator, fiber coupler, standard reference light source, adjustable fiber attenuator, first fiber collimator, holographic frequency selection module, electric reflector, volume holographic grating, second fiber collimator, beam splitter, optical interface unit, to be measured spectrometer, photoelectric detector, electric reflector driver, angle-second level angle encoder, control module, communication module, computer and image display unit.The present application utilizes volume holographic grating to select the corresponding relationship between the pixel of spectrometer and wavelength, can continuously select monochromatic light, and the theoretical resolution is consistent with the spectral resolution of light source;Using automatic calibration method, the automatic calibration of spectrometer is realized, pixel-wavelength calibration data can be automatically generated and stored in preset format, which is convenient for automatic calibration and data processing of spectral measurement software, and realizes wavelength-pixel position registration at pixel level.

An optical signal amplifier using a praseodymium doped fiber is described. The optical signal amplifier includes a signal laser, a first optical isolator, a second optical isolator a pump laser, a wave division multiplexer, a silica based glass optical fiber, a second optical isolator, an optical power meter, and an optical spectrum analyzer (OSA). The signal laser generates a signal laser beam. The pump laser generates a pumped laser beam. The wave division multiplexer combines the signal laser beam and the pumped laser beam and generates a combined laser beam. The silica based glass optical fiber has a preferred concentration of praseodymium ions of about 50×1024 ions / m3 and a length of about 5.7 m. The silica based glass optical fiber receives the combined laser beam, amplifies photons in the combined laser beam, and generates an amplified laser beam.

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

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

This specification relates to an optical particle counter, a method for using an optical particle counter, and a method for reducing particle counting errors during use of an optical particle counter. The method includes placing an optical isolator between a laser and a flow cell to allow laser light to pass through the flow cell and to reduce the intensity of light returned to the laser as optical feedback that could cause mode hopping.

The application discloses an SBS phase conjugation mirror capable of displaying a sound wave field in real time, and belongs to the technical field of nonlinear optics.The application comprises the following steps: pump light passes through a half-wave plate and a polarization beam splitter, passes through an optical isolator, changes a polarization state through a quarter-wave plate, is focused through a focusing lens, and then enters an SBS medium pool, stimulated Brillouin scattering occurs, a periodic density modulation is formed in the medium, and an equivalent acousto-optic grating structure is generated.Through introducing an independent probe light beam, the probe light enters the SBS medium pool at an incident angle satisfying the Bragg diffraction condition, and the probe light will be diffracted on the acousto-optic grating formed by the sound wave field.The intensity of the diffracted light changes with the intensity of the sound wave field, so that the real-time measurement of the sound wave field waveform and the life parameter in the SBS process can be realized by detecting the change of the diffracted light intensity with time.

This invention provides an optical isolator (81) with two or more optical paths, characterized in that each optical path comprises an isolator chip (3) formed by interconnecting one or more polarizers (4) and one or more Faraday rotators (5). The isolator chip (3) and a substrate are bonded and fixed together. The substrate is a light-transmitting substrate (2), and light passing through the optical path is transmitted through the isolator chip (3) and the light-transmitting substrate (2). Thus, for optical isolators inserted into laser modules with multiple optical paths, an optical isolator is provided that does not require the isolator chip to be placed in space outside the light-transmitting part, and simplifies the assembly process of the isolator chip.

This invention provides a device and method for generating simultaneously emitted three wavelengths of laser light with equal spacing, relating to the field of laser technology. The device includes a pump source, a half-wave plate, an optical isolator, a focusing lens, an input mirror, a Raman crystal, an output mirror, a nonlinear crystal, and a dichroic mirror arranged sequentially along the optical path. The pump light, after its polarization direction is adjusted by the half-wave plate and the optical isolator, is focused onto the Raman crystal. Stimulated Raman scattering generates first and second Stokes beams, which are then converted to sum-frequency light by the sum-frequency effect of the nonlinear crystal. Finally, the dichroic mirror outputs three equally spaced wavelengths of laser light. This invention separates the Raman conversion and sum-frequency processes through an external cavity structure, achieving for the first time the simultaneous emission of three equally spaced wavelengths of laser light, offering advantages such as high output energy, equal wavelength spacing, and simultaneous emission of three wavelengths.

Optical multiplexers, optical demultiplexers, optical transmitters including the optical multiplexers, optical modules including the optical transmitters and the optical demultiplexers, and methods of using the same are disclosed. The optical multiplexers include first and second beam combiners, a polarizing beam combiner, and an optical isolator. The first and second beam combiners each include a reflective surface and at least one filter, and are configured to combine individual optical signals having the same polarization state into a multi-channel polarized optical signal. However, the two separate multi-channel polarized optical signals having different polarization states. The polarizing beam combiner includes one or more reflective surfaces and one or more polarization filters, and is configured to combine the multi-channel polarized optical signals into a multi-channel output signal. The optical demultiplexers are structurally similar to the optical multiplexers, but provide a complementary or reverse function.The present multiplexers and demultiplexers reduce the four-wave mixing effect.

The application discloses a kind of semiconductor laser system and return light protection method.It includes laser, transmission fiber, processing head and drive control system, drive control system includes drive module and control module.Laser chip emits laser, and after shaping mirror group is shaped, it is coupled into transmission fiber, and from transmission fiber to processing head;Drive module provides operating current to laser chip;Control module monitors the operating voltage of laser chip in real time, when the operating voltage monitored exceeds preset safety threshold, sends off signal to drive module;Drive module receives off signal and cuts off the drive current output to laser chip.The application does not need additional optical detector and expensive magneto-optical isolator, directly monitors laser chip voltage parameter, only realizes return light protection by circuit module, simple structure, easy to integrate, low in cost, response is fast, can identify return light in time and execute protection, avoid laser chip to suffer persistent damage.

The invention discloses a time delay reserve pool calculation method based on dispersion orthogonal polarized light feedback VCSEL. An adopted time delay RC system comprises a tunable laser, a Mach-Zehnder modulator, a VCSEL, an optical isolator, an optical coupler, a polarization controller, a variable optical attenuator, a chirp fiber Bragg grating and a photoelectric detector. A signal of the input layer is modulated by a Mach-Zehnder modulator and then is injected into an X polarization component of the VCSEL of the reserve pool layer; emitted light of the VCSEL is divided into two paths after passing through the optical circulator, one path is reflected back to the VCSEL by the chirp fiber bragg grating after being subjected to cross-polarization rotation through the polarization controller, and a reserve pool layer of the time delay RC system is constructed; one path is transmitted to the output layer and is converted into an electric signal through a photoelectric detector. According to the method, the time delay characteristic can be further inhibited, so that generation of harmful resonance is further inhibited, and the method has stronger nonlinear characteristic and better calculation performance.

The application relates to the field of optical technology and discloses a 2-micron infrared polarized laser physiotherapy system with stable gain, which is composed of a 2-micron pulsed laser resonant cavity of stimulated radiation, a first-stage gain ring cavity, a second-stage gain ring cavity, an optical isolator, a filter, a power monitoring detector, a polarization light splitting module, a polarization light guiding fiber and a polarized laser output head, can output various polarized lasers, has the characteristics of stable gain and adjustable light spots, and can be applied to various linear polarized laser, circular polarized laser, vector polarized laser and vortex circular polarized laser physiotherapy systems.

The present invention relates to an optical fiber array assembly using external permanent magnets, and an optical module. The optical fiber array assembly comprises an optical fiber array module and optical isolators, the optical fiber array module comprising a first clamping portion, a second clamping portion and at least two optical fibers, and the optical fibers being arranged in an array. The optical isolators are respectively arranged at an end portion of the optical fiber array module and correspond to the optical fibers, and the optical isolators are non-magnetic optical isolators; at least one side of each optical isolator is provided with a permanent magnet, and the optical isolator is at least within a magnetic force range of the adjacent permanent magnet, the optical isolator being configured to operate under the action of the magnetic force of the permanent magnet. The present optical fiber array assembly can effectively reduce the risk of demagnetization, such that the yield of the optical fiber array assembly can be improved, the rework rate can be reduced, and the stability and reliability of the entire optical fiber array assembly can be improved; moreover, the present invention can effectively reduce the cost and avoid the problem of the production progress being affected due to supply shortage and ordering difficulties, thus better meeting market requirements.

The present invention provides defect-controlled fluoride crystals, a method for producing the same, and the use thereof. These fluoride crystals contain at least a rare earth element RE (RE is at least one element selected from the group consisting of cerium (Ce), praseodymium (Pr), lanthanum (La), and neodymium (Nd)), fluorine (F), and hydrogen (H), and have the same crystal structure as crystals represented by CeF3. A method for producing fluoride crystals according to the present invention comprises growing crystals from a raw material containing a rare earth element RE and a raw material containing fluorine (F) by a solvothermal method in the presence of at least one mineralizer selected from the group consisting of mineralizers containing an alkali metal element and / or an alkaline earth metal element, acid mineralizers, and mineralizers containing a normal salt.

The application discloses a kind of intensity modulation polarization encoding quantum key distribution systems based on sagnac ring, including communication end Bob and communication end Alice, the communication end Bob and communication end Alice are connected by optical fiber channel;The laser in the communication end Bob generates optical signal into optical isolator and exports linearly polarized signal parallel to cat eye direction into first polarization maintaining beam splitter;First polarization maintaining beam splitter exports linearly polarized signal parallel to cat eye direction into communication end Alice;Communication end Alice divides the linearly polarized signal parallel to cat eye direction into first linearly polarized signal and second linearly polarized signal with equal intensity and carries out intensity modulation, and finally polarized state signal is output into communication end Bob by the beam combination superposition of third polarization beam splitter after being combined, first single-photon detector to fourth single-photon detector in communication end Bob carries out measurement.The polarization encoding and quantum state modulation of signal are realized by one intensity modulator in the application, and the equipment cost of QKD is reduced.

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

To provide an optical isolator which is inserted into a laser module having a plurality of optical paths, and in which an isolator chip is not disposed in a space other than a translucent section, thus enabling the process of assembling the isolator chip to be simplified.SOLUTION: The present invention is an optical isolator with two or more optical paths, the optical isolator comprising an isolator chip in which one or more polarizers and one or more Faraday rotators are integrally joined to each other in each of the optical paths; the isolator chip and a substrate being joined and fixed together; the substrate being a translucent substrate; and light passing through the optical paths being transmitted through the isolator chip and the translucent substrate.SELECTED DRAWING: Figure 1

The invention relates to an illuminable laminated glazing for a vehicle, comprising a guest host cell and an optical isolator coating on a non-fluoropolymer carrier film within the lamination interlayer which is separate from or forms part of the guest host cell.

We provide a wire grid polarizer capable of reducing infrared reflectivity. [Solution] The wire grid polarizer 10 comprises a transparent substrate 11 and a grid-like protrusion 12 arranged on one surface of the transparent substrate 11 at a pitch of 1 / 2 or less of the wavelength of the incident infrared light and extending in a predetermined direction. The grid-like protrusion 12 has an aluminum layer 12a, and further has a β-FeSi2 layer 12b and an amorphous FeSi2 layer 12c on one side of the aluminum layer 12a.

The application relates to a kind of multi-channel short delay optical fiber laser linewidth measurement methods, the laser to be measured is divided into multiple channels by coupler after passing through optical isolator, wherein the first group of optical signals are frequency-shifted by acousto-optic modulator, the remaining optical signals are coupled with the first group of frequency-shifted optical signals after passing through different lengths of short delay optical fiber, converted into optical signals after input to photodetector, finally output to oscilloscope or spectrum analyzer to extract the power difference of power spectrum first-order envelope peak and second-order envelope peak, and finally the linewidth parameter of the laser to be measured is obtained by correlation processing. The application can effectively reduce the length of delay optical fiber, reduce the sensitivity of the system to environmental vibration interference by 100 times, and the multi-channel information collection of different lengths of delay optical fiber can obtain the average level of the laser linewidth output in a time period and under a working state at one time, which is beneficial to eliminate the accidental error influence in linewidth measurement.

The application relates to an optical device without an isolator, comprising a transmitting end, a polarizer, a first filter, a receiving end and a pigtail, the transmitting end is arranged obliquely relative to the polarizer, the first filter is arranged obliquely between the polarizer and the pigtail, and the receiving end is arranged on the reflection light path of the first filter; linearly polarized light emitted by the transmitting end is coupled to the pigtail after being transmitted by the polarizer and the first filter in sequence; and a received optical signal recycled from the pigtail enters the receiving end after being reflected by the first filter. The application effectively suppresses the interference of reflected light. The traditional scheme needs an optical isolator, and the application omits the optical isolator through specific optical path structure design, reduces the device manufacturing cost, and meets the application requirements of consumer-grade optical communication products.