410 results about "Laser diode" patented technology

The invention discloses a polarization-state-based optical fiber vibration sensing system and application, and relates to the technical field of optical fiber sensing, and the polarization-state-based optical fiber vibration sensing system mainly comprises a transmitting end and a receiving end. The transmitting end comprises a laser diode, a first erbium-doped optical fiber amplifier, a first circulator, a polarization scrambler, a single-mode optical fiber link, a second circulator and a second erbium-doped optical fiber amplifier which are connected in sequence; and the receiving end comprises a polarization beam splitter, a first shunt module, a second shunt module, an optical mixer, a first balanced photoelectric detector, a second balanced photoelectric detector, a third balanced photoelectric detector and a polarization analysis module. According to the optical fiber vibration sensing system based on the polarization state and the application, the vibration monitoring performance and reliability in a long-distance and high-noise environment can be improved.

Provided is a medical skin treatment device including a control unit for controlling the operation of the skin treatment device; a main body which includes a transfer unit and a power supply unit; and a handpiece which is supplied with power from the power supply unit and controlled by the control unit and one side of which is brought into contact with a patient's skin to irradiate same with laser beams. The handpiece includes at least four different laser diodes; the at least four laser diodes radiate laser beams of four different wavelengths and comprise first laser diodes, second laser diodes, third laser diodes, and fourth laser diodes; the number of the first laser diodes is 30 percentage or less of the total number of the laser diodes; and the number of the fourth laser diodes is 25 percentage or greater of the total number of the laser diodes.

The invention discloses an underwater measurement method based on a zoom camera and a laser diode, which adopts the zoom camera to measure a laser spot image and greatly expands the application scene of equipment. The lasers A, B and C are manufactured based on laser diodes, the linearity of power adjustment can be well guaranteed, and measurement errors caused by too bright or too dark laser spots in images shot by the camera can be effectively avoided. According to the underwater measurement method provided by the invention, not only can the distance of the target object be measured, but also the feature size of the target object can be measured; in the installation process of the underwater measurement device, an error measurement link of the installation position of the laser is added, and the error is fully considered when the feature size of the target object is measured, so that the measurement precision is improved. During calibration, the average value of the height of the triangle and the corresponding bottom edge ratio in the maximum magnification and minimum magnification states of the zoom camera is taken as an independent variable, so that the influence of magnification change on calibration precision is reduced.

The invention discloses a highly packaged magnetic sensing chip based on an NV color center, and the chip comprises a packaging housing (1) which is provided with a packaging pedestal and chip pins. The chip is characterized in that the chip also comprises an NV color center diamond (2) which is arranged on the packaging base; the laser diode bare chip (3) is arranged on the packaging base, and the light-emitting side of the laser diode bare chip faces the NV color center diamond; the microwave transmission microstrip line (4) is arranged between the interior and the edge of the packaging base and is electrically connected with the chip pins; the first photoelectric detector assembly (5) is arranged on the NV color center diamond and used for collecting fluorescence signals.

A lighting device for a motor vehicle, in particular a high-definition headlamp, includes an imaging component that has an active surface on which light-emitting diodes or laser diodes are arranged in a matrix to generate pixels in a light distribution in a targeted manner, and a projection lens with which the light emitted from the active surface is projected outward from the motor vehicle when the lighting device is in operation. The lighting device is designed to switch the projection lens from a first setting to a second and from the second setting to the first. The projection lens has a first focal length in the first setting, and a second focal length in the second setting, which is greater than the first focal length.

A laser diode includes an active region, confinement layers, and cladding layers. The active region includes one or more active layers that each exert a first strain in a first direction and one or more strain compensating layer that each exert a second strain in a second direction that is opposite the first direction. The confinement layers bound the active region. The cladding layers bound the confinement layers. In some embodiments, each active layer comprises InAs quantum dots in a InrGa1-rAs quantum well, where 0≤r≤1; and each strain compensating layer comprises a GaAs1-sPs layer, where 0<s≤1. The confinement layers may each comprise a (AlzGa1-z)wIn1-wP layer, where 0<w<1 and 0≤z<1. The cladding layers may each comprise a (AlyGa1-y)xIn1-xP layer, where 0<x<1 and 0≤y<1.

The invention discloses a miniature high-power laser module for outputting specific light spots and a preparation method thereof. The miniature high-power laser module comprises a substrate packaged in a metal packaging tube shell, and a driving circuit and a laser diode array are integrated on the substrate; an input interface is welded on the substrate, the laser diode array is coupled and butted with the multi-path one-to-one optical fiber array through a quartz coupling structure with a grooved structure, optical fibers on the multi-path one-to-one optical fiber array are combined and then subjected to light spot shaping arrangement to form light spots with specific shapes, and shaping is completed. A specific light spot output interface is formed; after receiving an external input signal from the input interface, the driving circuit generates a large-current pulse, the pumping laser diode array emits light, and the light is output to an application end through the optical fiber output interface. According to the invention, through a three-dimensional integrated architecture of AlN substrate integrated packaging, thermal management and pulse capacitor direct drive topology, the problems of large size, slow response, low reliability and the like of a traditional laser are effectively solved.

A sensor chip structure (600) design based on a solid-state quantum spin sensing system, a manufacturing method, and a supporting related device. The sensor chip structure (600) is a diamond-based magnetic field and temperature sensing chip manufactured on the basis of a micro-nano processing technique, and comprises: a microwave radiation structure, a diamond NV center material, a laser diode, a heat dissipation structure, an optical filter (7), and a photodetector (6) which are manufactured on an insulating substrate.

The invention relates to a semiconductor device, e.g. for the emission or absorption of light, preferably in the deep ultraviolet (DUV) range. The device, e.g. a resonant cavity light emitting diode (RCLED) or a laser diode, is formed from: a substrate layer (302), preferably comprising a distributed Bragg reflector (DBR); a graphitic layer (304); and at least one semiconductor structure (310), preferably a wire or a pyramid, grown on the graphitic layer, with or without the use of a mask layer (306). The semiconductor structure is constructed from at least one III-V semiconductor n-type doped region (316) and a hexagonal boron-nitride (hBN) region (312), preferably being p-type doped hBN.

The invention relates to the technical field of smoke sensors, in particular to a smoke sensor detection device and a detection method thereof.The smoke sensor detection device comprises a mounting base, a mounting frame is fixedly connected to the top of the mounting base, a first mounting plate and a control module are fixedly connected into the mounting base, and an audible and visual alarm is fixedly connected to the exterior of the mounting base; a temperature sensor, a humidity sensor, an air pressure sensor, an airflow velocity sensor, a laser diode, a photodiode and a dual-electrode ion sensor are fixedly connected outside the first mounting plate; the temperature sensor, the humidity sensor, the air pressure sensor, the airflow velocity sensor, the laser diode, the photodiode and the dual-electrode ion sensor are electrically coupled with the control module; according to the system, temperature, humidity, pressure and airflow parameters are collected through multiple types of high-precision sensors, and then the false alarm probability can be reduced through control analysis of the control module.

A passively, Q-switched laser is described. The laser may operate at an eye-safe lasing wavelength of 1.34 microns and use a gain element of Nd:YVO4 and a saturable absorber element of V:YAG with a space separating the gain element and saturable absorber element. The Q-switched laser is pumped by a grating stabilized laser diode. The laser may be used in laser ranging applications.

An optical sensing system comprises a human interface structure to be applied to a user. The system comprises a time-of-flight sensor with an array of laser diodes with Bragg reflectors operating in the near-infrared, a detection system, and a processor generating a time-of-flight measurement and a first image. The system also includes a first camera system capturing a second image, and a second camera system illuminated by light emitting diodes to monitor one or more eyes of the user. In communication with or operating on the processor is an artificial intelligence assistant, which comprises a multi-modal generative artificial intelligence model. The system may be part of wearable eyewear such as smart glasses or extended reality goggles. The system may perform gesture analysis, eye tracking and speed recognition, and video and verbal outputs can be provided to the user. An artificial intelligence agent may have awareness of the environment.

Hybrid integrated photonic integrated circuit laser comprising a photonic integrated circuit including an elongated optical waveguide comprising an elongated gain medium waveguide, at least a first and second optical reflector, the gain medium waveguide being located or extending between the first and second optical reflectors and being located inside an optical cavity to provide optical feedback. Further comprising a pump laser diode to provide electromagnetic radiation to the gain medium waveguide. The elongated optical waveguide, and the first and second optical reflectors are monolithically integrated inside the photonic integrated circuit. The gain medium waveguide comprises a rare-earth ion implanted silicon nitride waveguide core. The pump laser diode is positioned adjacent to the at least one photonic integrated circuit and is edge coupled or facet coupled to a lateral edge or a facet of the photonic integrated circuit to provide pump radiation to the rare-earth ion implanted silicon nitride waveguide core.

In an LD-pumped solid-state laser, where a solid-state laser crystal is excited by excitation light emitted from an LD to cause laser oscillation, and the resulting laser oscillation light of two frequencies is converted into a sum frequency, stable operation and cost reduction are achieved. [Solution] In an LD-pumped solid laser 1 comprising a solid laser crystal 19, an LD 11 that emits excitation light to excite the solid laser crystal 19, a resonator that resonates the light emitted from the solid laser crystal 19, and an optical wavelength conversion element 22 that converts the wavelength of solid laser oscillation light L21 and L22, a multiplexing means 21 is provided that receives the two solid laser oscillation light L21 and L22 from different directions and combines them into one, and the optical wavelength conversion element 22 converts the combined solid laser oscillation light L21 and L22 into a sum frequency.

The utility model discloses a laser diode control circuit of a laser, comprising a pulse control signal generation circuit used for generating grid control pulse signals with adjustable power, frequency and duty ratio; the power amplification circuit is used for amplifying the grid control pulse signal; the grid electrode of the MOS tube is connected with the output end of the power amplification circuit, the source electrode of the MOS tube is connected with one end of a driving resistor, and the other end of the driving resistor is connected with the negative electrode of a driving power supply and a ground wire; the positive electrode of the laser diode is connected with the positive electrode of the driving power supply, the negative electrode is connected with the drain electrode of the MOS tube, and the laser diode is provided with a heat dissipation block; and the temperature acquisition control circuit is used for acquiring temperature data of the heat dissipation block and controlling the on-off state of the driving power supply, and controlling the driving power supply to be adjusted to be in a power-off state under the condition that the temperature data exceeds a preset temperature threshold value. According to the utility model, the heating value can be reduced, the optical power is improved, and the laser diode is protected when the temperature of the laser diode abnormally rises.

A particulate matter detection device takes holographic images of flowing particulate matter concentrated by a virtual impactor, which selectively slows down and guides larger particles to fly through an imaging window. The flowing particles are illuminated by a pulsed laser diode, casting their inline holograms on a CMOS image sensor in a lens-free mobile imaging device. The illumination contains three short pulses with a negligible shift of the flowing particle within one pulse and triplicate holograms of the same particle are recorded at a single frame revealing different perspectives of each particle. A deep neural network classifies the particles based on the acquired holographic images. The device was tested using different types of pollen and achieved a blind classification accuracy of 92.91%. This mobile and cost-effective device weighs ˜700 g and can be used for label-free sensing and quantification of various bio-aerosols over extended periods.

The invention relates to the field of diode production and processing, in particular to press-fitting quality optimization design of a diode in the press-fitting process. According to the press-fitting system and method suitable for the laser diode, the direction of the diode is adjusted in real time before press-fitting through the integrated automatic overturning design, efficiency is improved, failure modes such as electrical short circuit, optical imbalance and poor heat dissipation caused by direction errors are effectively avoided, and the service life of the laser diode is prolonged. And high precision and high reliability of the laser press fitting process are guaranteed.

A kit for an encryption system characterized in that the kit consists of two mobile phones, a positioning device, several connecting elements, commercially available software for text, sound, image and video processing and a USB plug in which a camera, a light-sensitive photodiode, a laser diode, a microphone, a loudspeaker and a connector for fiber optic cables are arranged.

Single-transverse-mode laser diodes that include a bowtie-shaped ridge waveguide. Related apparatuses, data storage devices, computing systems, and methods.

This invention discloses a Littrow-type cavity length-compensated mode-hopping-free continuously tunable semiconductor laser, comprising a laser diode (1), a collimating lens (2), and a diffraction grating (3). Mode-hopping-free continuous tunability is achieved through a micro-elastic material base (4). The micro-elastic material base (4) is hollowed out to create a movable block (401) that can be driven by a piezoelectric ceramic (5), an isosceles triangular groove (404), and a pair of waist arms (406), enabling micro-displacement and micro-angle changes in the waist arms (406), thereby achieving continuous tunability of the output laser. This invention achieves mode-hopping-free continuous tunability of the laser output through an innovative combination of a special mechanical structure and the frequency selection characteristics of the grating. The structure is compact and highly stable, ultimately resulting in a mode-hopping-free continuously tunable external cavity semiconductor laser that meets the requirements of high-end precision measurement.

The invention relates to the technical field of semiconductor devices, in particular to a novel electric pump AlGaN-based deep ultraviolet laser diode and a preparation method thereof. The structure comprises a stacking structure, a passivation layer, an n-type metal electrode layer and a p-type metal electrode layer, a substrate, a template layer, a bottom DBR layer, a step-shaped n-type AlGaN layer, a micro-cavity LED active region layer, a p-type AlGaN layer, a step-shaped p-type AlGaN contact layer, a top DBR layer, a lower waveguide layer, an LD multi-quantum well layer and an upper waveguide layer are stacked on the stacking structure in sequence. The ridge surface width of the p-type AlGaN contact layer is greater than or equal to 100 microns; the passivation layer covers the surface and the side wall of the stacked structure, and electrode layer growth channels are formed in the step surfaces of the n-type AlGaN layer and the p-type AlGaN contact layer respectively; and the n-type metal electrode layer and the p-type metal electrode layer respectively penetrate through the corresponding electrode layer growth channels. The advantages are that the wide ridge design improves the light output power, the performance is excellent, and the etching damage is reduced.

The present application relates to the technical field of furniture detection, and relates to a device for detecting the smoothness of the inner wall of a hole in solid wood furniture, comprising a support and a detection unit, the support being used for arranging and adjusting the direction and angle of the detection unit, the detection unit comprising a fiber bundle probe and a main component, the fiber bundle probe being used for emitting light and receiving reflected light of the inner wall of the hole in the solid wood furniture to detect the smoothness, the fiber bundle probe comprising one emitting fiber and a plurality of receiving fibers, the emitting fiber being located at the center and the plurality of receiving fibers being uniformly distributed around the emitting fiber; the main component being connected with the fiber bundle probe and being used for providing a light source and processing reflected light signals, the main component comprising a laser diode, a programmable laser drive circuit, a MEMS micromirror array, a photodiode array and a microprocessor, the present application realizes non-contact detection through emitting and receiving light, completely avoids physical damage to the hole wall of the wood, and is particularly suitable for quality control of high-grade solid wood furniture.

The invention relates to a Raman spectroscopy device (30) for measuring the concentration of a gas. The core of the invention is that the Raman spectroscopy device (30) has a control and regulation device (72), wherein a first control loop (73) and a second control loop (74) are implemented in the Raman spectroscopy device (30), wherein the first control loop (73) is configured to control the temperature of the laser diode (16) to a first setpoint, and wherein the second control loop (74) is configured to control the temperature of the detector (70) to a second setpoint.

To determine the quality of connection of an optical connector.SOLUTION: The optical connector connection determining apparatus includes a 1.5 μ F1a for introducing a connection checking laser beam into an input optical fiber mLD14, a connection checking laser beam extraction unit 17 for extracting the connection checking laser beam from the extraction optical fiber F1d, a connection determining unit 18 for determining whether the connection between the first optical connector 12 and the second optical connector 22 is good or bad based on the connection checking laser beam extracted by the connection checking laser beam extraction unit 17, a first connection checking laser beam applying unit F1b - c for receiving the connection checking laser beam from the intermediate optical fiber F1c and applying the connection checking laser beam to another intermediate optical fiber 19a, and second connection checking laser beam applying units F2a, F2c, F2b for receiving the connection checking laser beam from one second optical fiber () and applying the connection checking laser beam to another second optical fiber (). 26b F2d 26c 26a 24a 24c 24b.SELECTED DRAWING: Figure 1

The invention relates to a rain sensor for motor vehicles that precisely detects rain intensity and dirt accumulation on the windshield. The sensor uses modulated light beams emitted by LEDs or laser diodes and guided through the windshield. Changes caused by raindrops or dirt are detected by photodetectors and analyzed by a control unit consisting of a computer system with a CPU and memory. The control unit processes the signals and derives measured values ​​for the probability of rain and the windshield's attenuation. In addition, the sensor supports encrypted communication, software updates, and integration into modern connected vehicle systems. Its modular design allows for adaptation to various vehicle models and environmental conditions. The rain sensor is future-proof and ready for integration into intelligent and autonomous vehicle systems, ensuring high precision and reliability under diverse weather conditions.

A fiber amplifier to amplify seed light has a laser diode, an optical fiber segment, and a doped fiber. The laser diode generates pump light at a pump wavelength from an end facet, and optical fiber segment in optical communication with the pump light has a fiber Bragg grating (FBG) configured to lock the pump light from the end facets to the pump wavelength. The pump light from the laser diode interact with an active dopant of the doped fiber and can thereby amplifies the seed light. To provide less coherent light and improve stability of the laser diode over operation conditions, variations in refractive index in the FBG have a chirped period changing linearly along a length of the FBG. The chirped period shifts the reflectivity asymmetrically from a central wavelength region of the FBG, such as blue-shifting the reflectivity for a short wavelength.

The invention belongs to the field of semiconductor lasers, and provides a semiconductor laser diode driving circuit and a driving method. Comprising a single-pole multi-throw analog switch, a power triode driving circuit, a constant current mode feedback loop, a constant voltage mode feedback loop, a constant power mode feedback loop and an incoherent control circuit. The power triode driving circuit comprises a controller, a digital-to-analog converter, a power triode Q1, an integrator circuit based on an operational amplifier, a voltage source VCC, a laser diode V1 and a power resistor R2; the single-pole multi-throw analog switch is connected with the controller, and the controller controls the digital-to-analog converter; the single-pole multi-throw analog switch is respectively connected with the constant current mode feedback loop, the constant voltage mode feedback loop and the constant power mode feedback loop, and switching control of a constant current mode, a constant voltage mode and a constant power mode is realized through channel opening and closing of the single-pole multi-throw analog switch. According to the invention, the defects of single working mode, lack of coherence regulation and control capability and insufficient digitization degree in the prior art are overcome.

The application discloses a high-pressure gas particle counter with a laser diode as a light source, which comprises an optical detection unit, a gas path system and a standard particle reference system, wherein the optical detection unit is used for generating laser and dividing the laser into two independent light paths, i.e., a main light path and an auxiliary light path, and is used for irradiating a main detection area and an auxiliary detection area respectively and receiving a particle scattering light signal and converting the particle scattering light signal into an electric signal; the gas path system is used for selectively conveying a high-pressure gas to be measured and a standard particle gas to the main detection area and the auxiliary detection area; the application belongs to the technical field of gas particulate pollution monitoring, and aims to solve the problem that the output light power of a laser diode in the prior art will drift with the increase of working time and the change of temperature, thereby causing the measurement reference to be inaccurate, and achieves the technical effect that a real-time online dynamic calibration mechanism is constructed by introducing an auxiliary reference light path and the standard particle reference system, and the problem of the measurement reference drift caused by factors such as light source aging and temperature drift is effectively overcome.

In some implementations, an optical device (e.g., a monolithic master oscillator power amplifier (MOPA) diode) may include a first facet, one or more gratings, an amplifier structure terminated with a second facet, and an oscillator array that includes multiple singlemode oscillators coupled to the first facet and to the one or more gratings. In some implementations, the multiple singlemode oscillators may be configured to generate multiple seed beams and to transmit the multiple seed beams into the amplifier structure through the one or more gratings.

A laser diode driver comprises a signal input terminal for inputting an electrical signal, an amplification stage unit for amplifying the electrical signal, a first driving stage unit for converting the amplified signal into a corresponding current, and a current-voltage adapter for outputting a second voltage via a second voltage output line, for absorbing current on the second voltage output line and / or for providing current to the second voltage output line in dependence on a voltage or current on the second voltage output line, the amplification stage unit being located in an upper layer of circuitry, a first operating current of the amplification stage unit forming at least part of an upper layer current, the first driving stage unit being located in a lower layer of circuitry, such that a second operating current is at least partly a continuation of the at least part of the upper layer current, such that operating currents of the amplification stage unit and the first driving stage unit can be at least partly multiplexed, so that power consumption of the laser diode driver can be reduced. The application also provides an optical transmission module.