59 results about "Fiber coupling" patented technology

The utility model discloses a silicon optical wafer test device and an alignment coupling mechanism and a test system thereof. The alignment coupling mechanism comprises an optical fiber coupling module, a piezoelectric displacement table and a tail end connecting structure which are connected in sequence. The optical fiber coupling module comprises three translation assemblies and three rotating assemblies which are sequentially connected in series; the three translation assemblies are used for driving the tail end connecting structure to do translation motion in the first direction, the second direction and the third direction correspondingly. The three rotating assemblies are used for driving the tail end connecting structure to rotate with the first rotating shaft, the second rotating shaft and the third rotating shaft as the center correspondingly. The first direction, the second direction and the third direction are vertical in pairs; the first rotating shaft, the second rotating shaft and the third rotating shaft are perpendicular pairwise. Each assembly only needs to achieve motion adjustment on one degree of freedom, the function is single, precise control over motion adjustment is facilitated, all the assemblies only need to be sequentially connected in series, spliced and connected, implementation is simple and easy, and equipment cost can be reduced.

This application relates to the field of laser technology and provides an integrated fiber coupling device and apparatus. The device includes a beam combining module and a coupling filter module integrated within a housing. The beam combining module polarizes and combines the laser beam, which is then coupled into a fiber combiner via a first fiber and output as a second fiber. The output is then filtered by a cladding filter unit and output through a nozzle. The coupling filter module contains multiple fixed cavities with curved walls. The first fiber at the input end of the fiber combiner and the second fiber at the output end are respectively fixed in curvature by adhering to the corresponding curved walls before output. This device improves beam quality and overall heat dissipation efficiency. The curved wall structure fixes the curvature of the fiber, reducing fiber stress and bending radius, thus solving the problems of excessive bending stress and insecure fiber fixation in existing coupling units, which lead to poor stability and reliability of laser output.

The invention provides an adjustable pulse string laser and a design method thereof. The laser comprises a pump light fiber coupling focusing system, an endoscope, a laser crystal, a passive Q-switched crystal, an active Q-switched system and a laser output mirror which are sequentially arranged according to a light path, the adjustable pulse train laser is configured to control the number of pulse trains under the condition of the same dominant frequency or output the same pulse trains under different dominant frequencies through the equivalent length control of the passive Q-switched crystal and the modulation control of the active Q-switched system in a working state. According to the invention, through cooperation of the active Q-switching system and the passive Q-switching crystal, output of a main frequency and a pulse string is obtained in a mode of combination of active Q-switching and passive Q-switching, multi-time processing of the same point in fine processing is facilitated, and single pulse energy is constant, so that a pulse string laser scheme which is lower in cost and more ingenious and uncomplicated in structure is provided; the regulation and control flexibility is good, and the stability and reliability of the laser are higher.

The invention discloses a thin-film barium titanate electro-optical switch unit based on a composite electrode and an array thereof. The optical switch unit comprises a first waveguide optical fiber coupling module, a second waveguide optical fiber coupling module, an optical beam splitting module, an electro-optical phase shift region, an optical beam combining module, a third waveguide optical fiber coupling module and a fourth waveguide optical fiber coupling module. Wherein the composite electrode of the electro-optic phase shift region is composed of a metal electrode and a transparent conductive layer, the electrode is closer to the waveguide by utilizing the transparent characteristic of a transparent conductive material, the coupling of a light field and an electric field is effectively enhanced, and the extinction ratio is improved. Meanwhile, a barium titanate film with a high electro-optical coefficient is adopted as a waveguide material, and the performance is further optimized, so that the electro-optical switch unit has the excellent characteristics of low-voltage driving, high extinction ratio, low insertion loss and small size.

This invention relates to an integrated laser packaging structure suitable for automated mass production, comprising a packaging box containing an upper cooler, a lower cooler, a laser chip assembly, an optical propagation assembly, an electrical connection assembly, a heat sink, and an optical fiber tail. The lower end face of the upper cooler has an upper coupling groove, and the upper end face of the lower cooler has a lower coupling groove and a first mounting groove, forming a coupling cavity. The heat sink is located within the first mounting groove, and the upper end of the heat sink has a second mounting groove, in which the laser chip assembly is mounted. A mounting assembly is fixedly installed within the coupling cavity. The position of each component within the packaging structure is predetermined, eliminating reliance on semi-automated testing and modulation during assembly, making it suitable for assembly line production. Furthermore, the use of a grooved cooler structure instead of the traditional sheet-like structure of a cooler allows the laser chip assembly and optical propagation assembly to be located within the laser-fiber coupling space formed by the grooves, resulting in better temperature control.

Provided in the present disclosure are a silicon photonics wafer test apparatus and a test method therefor, and a silicon photonics wafer test system. The silicon photonics wafer test apparatus comprises a camera assembly and a deflection optical path assembly; a prober for carrying a silicon photonics wafer; a fiber coupling module; and a driving assembly. When the driving assembly moves the silicon photonics wafer into the imaging field of view of the camera assembly, the camera assembly is adjusted such that the coordinate system is parallel to scribe lines of the silicon photonics wafer; when the driving assembly moves the deflection optical path assembly into the imaging field of view of the camera assembly, the camera assembly captures lateral images of a fiber end from at least two different directions via the deflection optical path assembly. The fiber coupling module is used for adjusting the pose of the fiber end on the basis of the lateral images and the direction of the coordinate system of the camera assembly, enabling initial alignment between the fiber end and the silicon photonics wafer. The present disclosure reduces the operational difficulty of alignment coupling between the fiber end and a silicon photonics waveguide, thereby simplifying the apparatus structure and reducing apparatus costs.

The invention discloses a high-power low-divergence-angle near-infrared semiconductor laser, belongs to the technical field of semiconductor lasers, and particularly relates to a high-power low-divergence-angle near-infrared band semiconductor laser. The problems that in the prior art, a low divergence angle and high light beam quality cannot be obtained at the same time under high-power output, and optical catastrophe damage (COD) and reliability reduction are caused by cavity surface heat accumulation are solved. The laser comprises a laser gain area, a conical waveguide area, a segmented waveguide area and a V-shaped groove structure optical fiber coupling area which are sequentially integrated in a monolithic mode in the laser propagation direction. The high-power low-divergence-angle near-infrared semiconductor laser is suitable for application scenes with high requirements on output power, light beam quality and system integration level, such as the fields of fiber laser pumping sources, laser processing, laser radars, space optical communication and the like.

The present application relates to an eye safety interlock for fiber coupled high power laser sources. A system is presented for continuously monitoring the integrity of the delivery fiber coupled to the laser source and shutting down the laser source immediately upon identifying any type of cut, break or disconnection along the delivery fiber. A pair of monitoring photodiodes are included with the laser source and used to observe the ratio of reflected light to emitted light, and if this ratio exceeds a given threshold, the laser is shut down. If there is a break, the power of the reflected light will be higher than normal, where a defined threshold is used to determine the calculated intensity indicative of the break. By using a measurement in decibels, the monitoring system only needs to employ the intensity difference to produce the reflected / delivery ratio output.

An optical-fiber holding component according to the present disclosure is disposed inside a ferrule and holds a plurality of optical fibers, the optical-fiber holding component comprising: an outer surface including a first end surface and a second end surface that are arranged in a first direction; a plurality of through-holes that penetrates from the first end surface to the second end surface in the first direction and are arranged side by side in a second direction crossing the first direction; and at least one air discharge hole that extends from the outer surface so as to cross the plurality of through-holes.

The invention relates to the technical field of measuring instrument metering and testing, in particular to a measuring system with a relative pose adjusting function and a working method of the measuring system. The system comprises a dual-frequency laser and an optical fiber coupling unit which are used for providing a light reference and a voltage reference for a measuring unit; the measuring unit is used for providing measuring light to the sine arm, when relative position deviation exists between the sine arm and the measuring unit, light spots on a four-quadrant detector in the measuring unit deviate from the center position, and relative position deviation information between the sine arm and the measuring unit is output. When relative angle deviation exists between the sine arm and the measuring unit, a light spot on a position sensitive detector in the measuring unit deviates from the central position, and angle deviation information between the sine arm and the measuring unit is output. According to the invention, through the relative pose monitoring system, the micron-level relative position adjustment precision and the arc-second-level relative angle adjustment precision between the sine arm and the measurement system can be realized.

The invention discloses a multimode cladding pumping resonance space division multiplexing optical fiber amplifier and an implementation method thereof, and relates to the technical field of optical fiber amplifiers. The multimode cladding pumping resonance space division multiplexing optical fiber amplifier comprises a transmission optical fiber, an active optical fiber, a multimode pumping optical fiber and a resonant cavity; the active optical fiber is one of a multimode optical fiber, a multi-core optical fiber and a multi-core multimode optical fiber and is used for realizing stimulated radiation amplification of multichannel signal light; the multi-mode pumping optical fiber is coupled with the active optical fiber through a pumping coupling assembly to form a pumping injection path which is used for accessing an external multi-mode pumping source and injecting pumping light into a cladding of the active optical fiber; by constructing a resonant light path for pumping recycling, residual pumping is converted into reusable effective pumping, so that the residual pumping participates in the pumping effect on the active section for multiple times in the system, the equivalent pumping intensity and the accumulative absorption amount of the active section are improved under the condition that the rated power of an external pumping source is not remarkably increased, and the energy consumption of the active section is reduced. The purposes of improving the gain efficiency and reducing the thermal load are achieved.

This invention provides a molecular simulation method for the pre-oxidation process of polyacrylonitrile fibers coupled with electron beam irradiation and heating, comprising the following steps: establishing a trans-syndiotactic stereotype model of polyacrylonitrile under a specific oxygen environment using computer molecular materials simulation software; inserting a temperature controller and creating a primary collision atom bombardment molecular system during the gradient heating process of polyacrylonitrile pre-oxidation using molecular dynamics methods to simulate the coupling effect of irradiation and heating; continuing the gradient heating to complete the molecular dynamics simulation of pre-oxidation; and outputting the microscopic results of the simulation process. This invention uses molecular dynamics methods to introduce electron beam irradiation during the gradient heating process of polyacrylonitrile to simulate the coupling effect of electron beam irradiation and heating in the pre-oxidation process of polyacrylonitrile. It proposes a set of controllable simulation parameters for the timing of electron beam irradiation introduction during the pre-oxidation process, which has guiding significance for exploring the pre-oxidation reaction mechanism of the coupling effect of electron beam irradiation and heating on polyacrylonitrile fibers.

The utility model relates to a kind of high-power low divergence angle near-infrared semiconductor laser, belong to semiconductor laser technical field, especially to a kind of high-power low divergence angle near-infrared waveband semiconductor laser;Solved the problems of existing technology, such as cannot obtain low divergence angle and high beam quality simultaneously under high-power output, and the optical catastrophe damage (COD) and reliability decline caused by cavity surface heat accumulation;The laser includes laser gain region, taper waveguide region, segmented waveguide region and V-shaped groove structure fiber coupling region integrated in order along the direction of laser propagation.The high-power low divergence angle near-infrared semiconductor laser is suitable for the application scene with higher requirement to output power, beam quality and system integration, such as fiber laser pump source, laser processing, laser radar and space optical communication etc.

The invention discloses an optical fiber coupling efficiency improving method based on a bat algorithm. The method comprises the following steps that optical power data are collected and preprocessed; constructing a coupling parameter search space model; initializing an improved submerged space enhancement-bat algorithm, and outputting an initial coupling parameter vector; introducing countercurrent coding to generate a submerged space vector; calculating and outputting an optimal action vector through a differentiable strategy flow mapping mechanism; obtaining a current iteration optimal bat individual; outputting a coupling parameter vector of the global optimal bat individual; and the improved submerged space enhancement-bat algorithm is recalled to perform parameter optimization calculation, so that the optimization speed and the global optimal stability of optical fiber coupling are effectively improved, the coupling loss is remarkably reduced, and the automatic adjustment precision and the optical power stability of the system are improved.

The invention relates to the technical field of optical light sources, and discloses a wavelength-adjustable optical light source device and a wavelength adjusting method thereof. The device comprises a multi-wavelength monochromatic source array, a grating assembly, a matched optical element and an exit slit or optical fiber coupling output, the device is divided into a reflection type structure and a transmission type structure, the light source array is arranged on a spectrum focal plane according to a spectrum dispersion sequence based on the reverse application logic of a dispersion spectrometer, and the light emitting position is matched with the wavelength distribution of a dispersion system. The monochromatic light sequence switching emission or multi-wavelength combined emission can be controlled through an instruction, and switching is realized only through an electric signal and grating angle adjustment without mechanical motion. The device is compatible with a reflection type grating and a transmission type grating, adapts to ultraviolet to infrared broadband, has the characteristics of simple light path, low energy loss and high stability, and is suitable for scenes such as spectral analysis, optical communication, bioluminescence imaging and the like.

The invention provides a mold for casting molding of an optical fiber coupling intelligent buoyancy material and a method for preparing the optical fiber coupling intelligent buoyancy material. Through the design of the mold structure and the embedded part structure for casting molding of the optical fiber coupling intelligent buoyancy material, the leading-out mode of the optical fiber grating sensor is optimized, and the problem that the surface of the optical fiber coupling intelligent buoyancy material is difficult to cut and process is effectively solved; and the fiber grating sensor led out from the surface of the buoyancy material can be prevented from being damaged in the process of detaching the buoyancy material from the mold and the cutting process. The surface of the optical fiber coupling intelligent buoyancy material is smooth and crack-free after cutting processing, and the water absorption rate is less than 1.00% after a hydrostatic pressure test at 116MPa for 24h; meanwhile, the fluctuation of central wavelength signals corresponding to the grating of the fiber grating sensor before and after cutting processing is small, and the fiber grating sensor can still transmit internal wavelength change signals after cutting processing.

The application relates to an anti-impact and anti-abrasion repairing material based on a multi-scale fiber coupling technology and belongs to the technical field of engineering material repairing. The anti-impact and anti-abrasion repairing material is composed of cement gel material, aggregate, a four-element multi-scale fiber reinforcing body, admixture, a modified coupling agent, an additive and water; a four-element multi-scale fiber system of "memory alloy fiber-carbon fiber-polyethylene fiber-whisker" is constructed, the four-element multi-scale fiber system is matched with the self-developed modified coupling agent, the interpenetration and lap joint of different scale and different function fibers are utilized to form a synergistic coupling effect, and the characteristics of the modified coupling agent are synergistically strengthened, so that the comprehensive improvement of the impact resistance, the wear resistance, the toughness and the intelligent repairing adaptability of the material is realized, and the efficient repairing and long-term protection problems of cement-based engineering structures under complex impact and abrasion conditions are solved.

A wafer with a buried V-groove cavity, and a method for fabricating V-grooves. In some embodiments, the method includes bonding a first layer, to a top surface of a substrate, to form a composite wafer, the first layer being composed of a first semiconductor material, the substrate being composed of a second semiconductor material, the top surface of the substrate having a cavity, the cavity including a V-groove.

This invention relates to the field of semiconductor laser technology, specifically to a narrow-linewidth fiber-coupled semiconductor laser with continuously tunable spectrum. It includes at least one laser emitting unit, a fast-axis collimating lens, a slow-axis collimating lens, a beam conversion system, a Littrow grating, a beam processing device, and an fiber coupling device. The beam conversion system rotates the fast and slow axes of the collimated beam by 90 degrees, aligning the fast-axis direction (high beam quality, pure mode) with the beam selection direction of the Littrow grating for external cavity feedback and mode selection, thus obtaining a narrow-linewidth output. Continuous tuning of the output spectrum is achieved by rotating the angle of the Littrow grating. Multiple emitting units can be spatially spliced ​​and polarization-combined for power expansion, and coupled into the fiber via an equal optical path. This provides a high-brightness fiber-coupled laser with both narrow linewidth and continuous tuning capabilities, particularly suitable as a high-quality sub-beam for high-channel-number spectral synthesis.

This invention provides a multi-stage fiber-coupled semiconductor laser, belonging to the field of fiber-coupled semiconductor technology. It includes: a fiber coupling module for outputting a wavelength-locked and tunable laser beam; a multi-stage spectral synthesis unit for performing step-by-step spectral synthesis on the laser beam to output a multi-path spectrally synthesized beam; and a fiber combining unit for combining the multi-path spectrally synthesized beam and outputting the synthesized laser beam from a single output fiber. This invention solves the technical problem in existing semiconductor lasers where it is difficult to balance beam quality and brightness when increasing power, achieving a balance between high power and high brightness, improving system synthesis efficiency and scalability, and enhancing output beam quality and availability.

The invention relates to a fiber-coupled quantum sensor based on the color center principle, comprising: a sensor layer (1) in which color centers are formed, a first optical waveguide having a first numerical aperture for guiding an excitation light to the sensor layer (1), and at least one second optical waveguide having a second numerical aperture for guiding back a fluorescent light generated by the color centers, wherein the second numerical aperture is greater, in particular greater by at least a factor of 2, than the first numerical aperture.

The invention relates to the technical field of semiconductor lasers, in particular to a laser based on annular resonant cavity and grating fiber coupling. The annular optical gain ring optical waveguide is arranged on the upper end face of the substrate; the top positive electrode is plated on the upper end surface of the optical waveguide of the annular optical gain ring; the bottom negative electrode is plated on the lower end surface of the substrate; the Bragg grating optical fiber is arranged on the upper end face of the substrate 1, and the Bragg grating optical fiber wraps part of the annular optical gain ring optical waveguide from the outside; the HR high-reflection film is plated on the end face, deviating from the light output direction, of the Bragg grating optical fiber; and the AR film is plated on the end face of the Bragg grating fiber in the light output direction. The method has the following beneficial effects: 1, the process is simplified, and the cost is reduced; 2, the coupling loss is extremely low; 3, the line width is narrow and the monochromaticity is high; and 4, the structural stability is high.

This invention discloses a coupling structure and method for an anti-resonant hollow fiber and a single-mode fiber, belonging to the field of fiber coupling technology. The technical solution is as follows: a coupling structure for an anti-resonant hollow fiber and a single-mode fiber, characterized by comprising a broadband light source, a first single-mode fiber, an anti-resonant hollow fiber, a tapered coreless fiber, a tapered single-mode fiber, a second single-mode fiber, and a spectrometer. The beneficial effect of this invention is that by adjusting the parameters of the tapered coreless fiber, the light emitted from the anti-resonant hollow fiber is focused into the tapered single-mode fiber, thereby achieving mode field diameter matching between the single-mode fiber and the anti-resonant hollow fiber. Simulation and experimental results show that, compared to the traditional coupling of a tapered single-mode fiber and an anti-resonant hollow fiber, fusing a tapered coreless fiber at the tip of the tapered single-mode fiber significantly improves the coupling efficiency.

A laser diode package, comprising a housing having a metal base portion, an integrated heat spreader formed within the base, the integrated heat spreader comprising a first phase-change material (PCM) and configured to dissipate heat via phase-change cooling. A heat source may be disposed on a top surface of the base, the heat source may be thermally coupled to the integrated heat spreader so as to dissipate heat away from the heat source via phase-change cooling.

Systems and methods for fiber optic-coupled microtip sensors are described. Such sensors can be combined with tunable lasers to achieve precision detection of various types of gaseous chemical substances.

The invention discloses a portable long-distance laser ultrasonic surface wave velocity accurate measurement system and method. The system comprises a small pulse laser, a long-distance laser grating lens, a computer, a signal acquisition card, a photoelectric detector, a laser ultrasonic measurement interferometer, an optical fiber coupling lens of the laser ultrasonic measurement interferometer and a tripod. High-energy pulse laser beams emitted by the small pulse laser device form two laser beams which are crossed at a certain angle after being subjected to long-distance laser on the grating lens, the two laser beams are irradiated on the surface of a measured object to interfere and generate grid-shaped light spots with a fixed period, and the measured object generates periodic thermal elastic force under the irradiation of the grid-shaped light spots. Under the action of the periodic thermal elastic force, ultrasonic Rayleigh waves with the wavelength of 55nm are excited on the near surface of the measured object, and the ultrasonic Rayleigh waves are received by the laser ultrasonic measurement interferometer in the process of spreading along the surface. And performing Fourier transform on the received signal to obtain the center frequency f of the received signal, and accurately obtaining the propagation velocity of the laser ultrasonic surface wave at the measured position according to a formula c = f *.

The application discloses a laser assembly with disc gain medium structure, which comprises fiber-coupled output semiconductor laser, lens, conical mirror, lens, circular disc, output coupling mirror arranged in sequence, and a circle of taper surface is arranged on the side of the circular disc; the pump light emitted by the fiber-coupled output semiconductor laser is collimated by the lens, is transformed into annular light beam by the conical mirror, is focused by the lens, annular fine light beam is generated, is incident on the bottom surface of the circular disc, is reflected by the taper surface of the side of the circular disc, and is transmitted along the radius of the circular disc to the center, so that the pump absorption is realized; the bottom surface of the circular disc is coated with laser high reflection film, the high reflection film and the output coupling mirror jointly form a pair of cavity mirrors, and the laser is oscillated under the pump action and is outputted. The fiber-coupled output laser is transformed into annular laser by simple conical mirror transformation technology, is folded by nearly 90 degrees, and is pumped along the side of the circular disc, so that the laser assembly has the advantages of simple pump structure, convenient debugging and maintenance and the like.

The application discloses a fiber coupling system based on synchronous fast-axis compression and slow-axis self-polarization prism, comprising a plurality of groups of semiconductor laser stacks composed of a plurality of bars; the output of each bar in each group of semiconductor laser stacks is collimated by a fast-axis collimating lens and a slow-axis collimating lens, then is incident on a synchronous fast-axis compression and slow-axis self-polarization prism through a half-wave plate arranged along the slow-axis direction of the beam half-width, so that the light beam is offset in the fast-axis direction and is polarized and combined with the light beam in the slow-axis direction after the light beam in the slow-axis direction is polarized and combined, and the light of each adjacent two bars is offset in the fast-axis direction and is close to each other; the emergent light beam of the prism is compressed and filled by a beam compression and filling prism, then is combined by a wavelength combining mirror, and is focused and coupled into a target optical fiber by an aspheric lens. The application can offset and compress the dark area of the light beam in the fast-axis direction, and combines the polarization and combining technology, so that the light beam in the slow-axis direction is polarized and combined, and the uniform light beam quality is achieved.

The present application relates to the technical field of glass manufacturing, and particularly relates to a photoelectric glass blank, a preparation method and application thereof. The photoelectric glass blank comprises or consists of the following components: SiO2 21.8-25.5%, B2O3 24-26.9%, BaO 20-25%, TiO2 10.8-13%, La2O3 6.5-7.5%, SrO 3-4.1%, CaO 0.6-1.8%, Al2O3 0.3-1%, Y2O3 0.8-1.6% and Nb2O5 2.5-3.8%. The core glass prepared from the photoelectric glass blank has high refractive index and good heat processing performance, and can be well matched with the skin glass, which is of great significance for improving the stable operation of fiber coupling technology and micro-light imaging devices.

A full-field or line-field swept-source optical coherence tomography (OCT) system that uses a tilt-tuned cat's-eye laser whose semiconductor gain chip is dimensioned to lase in multiple spatial modes. The multimode output is preserved by free-space or multimode-fiber coupling from the laser to the interferometer, and is shaped by cylindrical line-forming optics to illuminate the sample with a long aspect-ratio line or across the field. The multimode operation produces a super-Gaussian, near flat-top intensity profile along the line or field and reduces spatial coherence, improving detector uniformity and lowering pixel cross-talk. Example implementations use a single-angled-facet gain chip with ridge width >3 μm and / or active-layer ridge height >2 μm, a thin-film interference filter tilt-scanned by a servoed galvanometer with encoder, and a line-scan camera to acquire parallel A-scans for B-scan formation. The approach maintains OCT advantages while relaxing single-mode constraints on the swept source and improving line-field and full-field image quality.