683 results about "Laser diode" patented technology

The invention provides a solution concentration real-time detection method based on focusing offset of a compound lens, which comprises the following steps: step A, laser emitted by a laser diode is collimated into parallel light through a plano-convex lens, the parallel light is emitted into a sample cell through a glass window, and then the parallel light is emitted by the compound lens to be imaged on an image sensor; step B, the parallel light is emitted to an image sensor through a compound lens to be imaged into two light spots, the distance # imgabs0 # between the two light spots on the image sensor is recorded, and the solution concentration is inversed through the distance # imgabs1 # between the two light spots; step C, respectively detecting the temperature and the pressure intensity of the solution to be detected through a temperature sensor and a pressure sensor, and compensating the influence of the temperature and the pressure intensity on measurement through an algorithm; on the basis of light spot form analysis of the compound lens, the solution concentration is inversed, the resolution capability of a low-concentration transparent solution is improved, and the detection stability of transparent solutions such as alcohol is improved.

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.

To improve the luminous efficiency of a UV light-emitting device, the UV light-emitting devices disclosed herein have an AlGaN-based crystal or an InAlGaN-based crystal, and comprise an emission layer, at least one electron blocking layer, a first p-type doped layer, and a composition gradient layer in which the Al composition ratio varies depending on the position over a thickness direction of the layer stack, stacked in this order in the direction of the flow of electrons. The Al composition ratio varies depending on the position over the thickness direction in the composition gradient layer. The UV light-emitting devices are implemented as UV-region light-emitting diodes and laser diodes.

The invention relates to the technical field of photoelectric detection, in particular to a laser diode state monitoring method and system based on multi-parameter fusion, and the method comprises the steps: carrying out the laying and collection of a plurality of parameters based on the working condition of a laser diode, including current, temperature and optical feedback signals, and carrying out the dynamic fusion to construct a damage index; establishing a grading early warning mechanism, correspondingly setting a judgment threshold value, and triggering early warning in combination with the damage index; the temperature is detected periodically, parameter drift influenced by the temperature is corrected based on a damage index, and state monitoring of the laser diode is achieved; by dynamically fusing a plurality of parameters of current, temperature and optical feedback signals, a multi-dimensional damage index is established, so that the influence of a plurality of indexes on laser diode damage is synthesized, and the recognition rate of early damage is improved; and establishing a grading early warning mechanism from a slight state to a serious state, making a corresponding early warning response, and advancing fault recognition of the laser diode to a reversible stage.

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.

A self-calibrating driver circuit (100, 300, 400, 500, 700) for a laser diode is disclosed. The circuit comprises a configurable current source (105, 305, 405, 505), a current mirror (115, 315, 415) configured to mirror a current from the configurable current source to a first transistor (120, 320, 420, 520, 720) and to a second transistor (125, 325, 425, 725), and a control circuit (140, 340, 440). The control circuit is configured to monitor a current through the first transistor at a first time, and to configure the current source based on the current through the first transistor to provide a desired current to the second transistor for driving the laser diode at a subsequent second time. A radiation-emitting device comprising one or more of the self-calibrating driver circuits and at least one radiation-emitting element is also disclosed.

The invention relates to a miniaturized medium-long wave infrared solid-state laser in which a thulium-doped laser directly pumps a ZGP crystal, the thulium-doped laser takes two laser diodes with the central emission wavelength of 793 nm as pumping sources, two Tm: YAP crystals with the same parameters are cascaded and placed in a U-shaped resonant cavity to serve as laser gain media, and an acousto-optic Q crystal controls intra-cavity loss in the resonant cavity, so that the thulium-doped laser directly pumps the ZGP crystal. Pulse laser with the wavelength of 1.94 m is output; the 1.94 m pulse thulium laser serves as pump light and passes through the ZGP-OPO module, and 2.8 m signal light and 6.2 m idler frequency light are obtained. The Tm laser outputs 1.94 m laser through primary oscillation to directly serve as a pump source, the ZGP-OPO outputs medium-long wave infrared laser in a nonlinear mode, the overall light path structure of the medium-long wave laser is simplified, and the electro-optical conversion efficiency is improved.

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 provides a solution concentration real-time detection method based on cylindrical lens focusing offset, which comprises the following steps: step A, laser emitted by a laser diode is collimated into parallel light through a plano-convex lens, the parallel light is emitted into a sample cell through a glass window, and the sample cell is used for detecting the concentration of a sample; and then the light is emitted by the cylindrical lens and is imaged on the image sensor. B, the parallel light is imaged into a light spot on the image sensor after being emitted by the cylindrical lens, the image sensor is driven by the stepping motor to move, the minimum light spot is found, the moving distance of the image sensor is recorded, and the solution concentration change is inversed through the moving distance; by introducing a cylindrical lens light path amplification mechanism, the detection precision is remarkably improved, the temperature drift is effectively inhibited, and the defect of insufficient sensitivity in the prior art is overcome.

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.

The utility model belongs to the field of laser application, and relates to beam shaping of a laser, in particular to a small-divergence-angle laser based on a beam shaping technology. The problems that in the prior art for laser diode collimation, astigmatism of the diode cannot be calibrated through single-lens collimation, and cost is increased due to the fact that fast axis collimation and slow axis collimation need to customize a fast axis collimating lens with a proper focal length are solved. The utility model discloses a small-divergence-angle laser based on a beam shaping technology. A first collimating lens, a fast-axis beam shrinking device and a beam expander are sequentially arranged on an emergent light path of a first laser diode; the light emitting point of the first laser diode is located at the focal point of the first collimating lens, the fast axis beam shrinking device comprises a first cylindrical lens and a second cylindrical lens, and the focal points of the first cylindrical lens and the second cylindrical lens coincide. According to the utility model, the divergence angle of the laser diode is reduced to 0.1 mrad, so that the diameter of a light spot at 500m is less than 100mm, and the actual light spot observed in an experiment is 80mm.

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.

A system for drying a battery electrode coating includes two laser diode arrays and a laser module. Each laser diode array emits multi-beam laser radiation to an edge region including a respective edge of a coating lane deposited on a metal foil. The laser module emits a diverging laser beam to an interior area of the coating lane between the two edges. The intensity distribution of the diverging laser beam at the coating lane spans a gap in the widthwise dimension between respective intensity distributions of the multi-beam laser radiation from the two laser diode arrays. The use of laser diode arrays to perform the edge drying allows for tailoring the intensity distribution of the combined laser irradiation to dry the coating lane without over-drying and delaminating the edges. The use of a single, diverging laser beam in the interior area allows for optimizing affordability and energy efficiency.

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.

An input is coupled to a cathode of a laser diode having its anode coupled to a high-voltage-supply, with a cascoded current mirror having an input and output branches. The input branch is coupled between the high-voltage-supply and a sense resistor coupled to the input. The output branch is coupled between the high-voltage-supply and an output. A sense resistance is coupled between the output and ground, and includes a diode-coupled transistor coupled to the output and a resistor coupled between the diode-coupled transistor and ground. The input branch generates a current proportional to a voltage across the laser diode, and the output branch generates a mirrored current proportional to the current proportional to the voltage across the laser diode. A voltage proportional to the voltage across the laser diode is generated by the mirrored current flowing through the sense resistance. A comparison circuit compares this voltage to a threshold.

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 belongs to the technical field of laser diode illumination and display, and particularly relates to a laser white light device for laser display and illumination and a preparation method thereof. Comprising a laser emission module and a fluorescence conversion module. The fluorescence conversion module comprises a pixelated transparent substrate, a green fluorescent powder unit and a red fluorescent powder unit; groove array structures which are arranged in a staggered mode are distributed on the upper side and the lower side of the pixelated transparent substrate respectively. The green fluorescent powder unit is arranged in the lower side groove array structure, and the red fluorescent powder unit is arranged in the upper side groove array structure; the laser emitting module emits laser from the lower portion of the pixelated transparent substrate to the upper portion, and the green fluorescent powder unit and the red fluorescent powder unit are excited to emit green light and red light respectively and then are fused to form white light. According to the invention, the heat dissipation performance of the fluorescence conversion module is improved, the reabsorption between red and green fluorescent powder is weakened, the luminous efficiency is improved, and a white light LD device with high brightness and high color rendering can be realized.

A laser diode drive circuit is provided includes one or more laser diodes, a driving switching element that switches between a state in which a current is supplied to the one or more laser diodes and a state in which the current is not supplied, a driving capacitor that supplies a current to the one or more laser diodes, a drive circuit, and a boot strap circuit that supplies a voltage to the drive circuit. The boot strap circuit includes a capacitor and an inductor that suppresses a flow of a current that flows to the capacitor and to the one or more laser diodes connected in parallel during charging of the capacitor.

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.

Provided is a semiconductor laser diode including multiple active layers and a grating layer. The semiconductor laser diode includes two (or more than two) active layers, a grating layer, and a tunnel junction. The grating layer and the tunnel junction are provided between the two active layers. The tunnel junction is electrically connected to the two active layers, and the two active layers share and are optically coupled to the grating layer, thereby improving the external quantum efficiency and slope efficiency of the semiconductor laser diode.

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 laser therapy device includes a control module having a housing, a display, a processor, and a non-transitory computer-readable medium having executable instructions encoded thereon such that, when executed, cause the processor to operate a laser module, and one or more removable laser modules configured to couple to the control module, wherein each of the one or more laser modules comprises a laser diode, and wherein the control module is configured to interchangeably receive one of the one or more laser modules. A method for providing laser treatment with a laser therapy device includes selecting, by a user, a treatment program from the display or a companion user interface coupled to the control module; and executing, by the processor, the treatment program, where the executing includes powering the one or more laser diodes and dynamically controlling a light emitted from the one or more laser diodes.

A robot including a robot arm having an end effector and a first laser diode provided on the end effector. The first laser diode is configured to emit a first laser light in a first direction. The robot further includes a camera configured to sense or detect first reflected light from an object upon which the first laser light contacts, and a processor configured to determine a clearance height between the end effector and the object using information from the first reflected light.

Systems and methods presented herein are operable to control operating parameters within a laser system. In some embodiments, a laser system includes a reflector, a gain medium optically coupled to the reflector and operable to emit laser pulses, and a plurality of laser diodes operable to pump the gain medium with laser diode pulses to stimulate laser pulse emission. The laser system also includes a Q-switch device operable with the reflector to resonate laser light through the gain medium, and an output coupler optically coupled to the Q-switch device and operable to output the laser pulses based on a polarization of the laser light. One or more of the plurality of laser diodes is further operable to control operating parameters of the laser system by inserting one or more diode ghost pulses between laser diode pulses that result in the emitted laser pulses.

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.

The invention discloses a high-pressure gas particle counter taking a laser diode as a light source, which comprises an optical detection unit used for generating laser, dividing the laser into a main light path and an auxiliary light path which are independent, respectively irradiating a main detection area and an auxiliary detection area, receiving a particle scattered light signal and converting the particle scattered light signal into an electric signal; the gas path system is used for selectively conveying to-be-detected high-pressure gas and standard particle gas to the main detection area and the auxiliary detection area; the invention belongs to the technical field of gas particulate matter pollution monitoring, and aims to solve the problem of measurement basis misalignment caused by drifting of output light power of a laser diode along with working time increase and temperature change in the prior art. A set of real-time online dynamic calibration mechanism is constructed; the problem of measurement reference drift caused by factors such as light source aging and temperature drift is effectively solved.

An interferometric module, constructed in single pentagonal block to produce high quality, robust, low cost entangled-photon sources enabling polarization entanglement swapping. The compact block forms a generic platform that facilitates a comprehensive integration of optical components while allowing for quick optical alignments. Phase-stability of the self-balanced Sagnac interferometer is harnessed to offer a highly stable performance at room temperature and under sever operating conditions. High-quality entanglement is inherently achieved by equalizing two interferometric optical paths from counter-propagating photons. A periodically poled nonlinear crystal is placed between two half-wave plates, which also serve to correct the polarization states of the photons. The result is compensation-free and plug-and-play entangled-photon sources for quantum routers, distributed quantum sensing and quantum telecommunication. Wavelengths and generation rate of photon pairs are realized via the hosted crystal. Energy and polarization entanglement, and hyperentanglement can be remotely set by rotating the polarization state of the pump laser diode.