42results about How to "Small spot diameter" patented technology

The invention discloses a method for preparing a titanium-based nano composite material based on selective laser melting 3D printing, relates to a method for preparing the titanium-based nano composite material, and aims at solving the problem of poor cutting processing performance of titanium and the titanium-based composite material. The method comprises the steps that preparation is conducted,wherein composite powder is prepared through ball milling, and the content of B4C powder in the composite powder is (0.5-1) wt%; selective laser melting 3D printing is utilized for shaping. The methodhas the advantages that the mass of the prepared composite material is light, the thermodynamic stability is high, the strength is high, the wearing resistance is high, fixture tools or molds are notneeded in the shaping process, 'near net shape forming' is easily achieved, the composite material can be massively prepared in a short time, and sources of raw materials are wide; substrate crystalline grains of the prepared composite material are significantly fined, in-site generated complete nano scale TiB whiskers are diffusely distributed on boarders of substrate crystalline grains, an obvious enhancing effect on the composite material is achieved, the mechanical performance is significantly improved, and the method is suitable for preparing the titanium-based nano composite material through 3D printing.

An information recording medium, comprising: a recording layer which can phase-change reversibly between a crystal phase and an amorphous phase by using an optical means or an electric means, wherein the recording layer comprises at least Ge, Te, M1 (which is at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Yb and Lu), M2 (which is at least one element selected from the group consisting of Sb and Bi) and M3 (which is at least one element selected from the group consisting of Te and Bi).

A near-field light generator includes: a waveguide; a clad layer having a penetrating opening and disposed on the waveguide; a plasmon generator accommodated in the opening; and a dielectric film interposed between the plasmon generator and each of the waveguide and the clad layer. In a method of manufacturing the near-field light generator, an initial clad layer is initially formed on the waveguide, and then the initial clad layer is taper-etched by RIE to form a recess that does not reach the top surface of the waveguide. Subsequently, the recess is etched by wet etching until the top surface of the waveguide is exposed in part. Next, the dielectric film is formed in the opening, and the plasmon generator is formed on the dielectric film.

A plasmon generator has an outer surface including a plasmon exciting part that faces an evanescent light generating surface of a waveguide. The outer surface further includes first and second inclined surfaces that increase in distance from each other with increasing distance from the plasmon exciting part, and a front end face. The front end face has first and second portions that are connected to each other into a V-shape. The first portion includes a first side lying at an end of the first inclined surface. The second portion includes a second side lying at an end of the second inclined surface. An angle formed between a lower part of the first side and a lower part of the second side is smaller than that formed between an upper part of the first side and an upper part of the second side.

A macro array comprises a film-shaped hard porous body and a plurality of spots, which contain test substances and are arrayed on the film-shaped hard porous body. The film-shaped hard porous body may be constituted of a surface layer region, which is provided with through-pores having a comparatively small mean pore diameter, and a base layer region, which is provided with through-pores having a comparatively large mean pore diameter. The surface of the film-shaped hard porous body, on which surface the spots are to be arrayed, may be coated with an auxiliary substance for promoting fixation of the test substances to the surface of the film-shaped hard porous body.

The invention discloses an LED-excited short wavelength infrared fluorescent microscopic imaging system. In the system, laser light emitted by a single-color LED passes through a collimating lens to be collimated firstly and is introduced into a light path of a microscope vertical illumination device, the exciting light is reflected with a dichroic beam combiner and converges onto a back focal plane of a microscopic objective, converging light forms parallel exciting light beams after passing through the objective and illuminates onto a sample, and a fluorescence probe in the sample is excitedto emit fluorescence; and a fluorescence signal passes through the objective, penetrates through the dichroic beam combiner and is finally received by a detection surface of an InGaAs camera to realize photoelectric conversion, and the signal is transmitted to a computer for data processing to obtain an imaged picture or a video. The LED-excited short wavelength infrared fluorescent microscopic imaging system has the remarkable advantages of high signal-to-noise ratio, high magnification, high resolution, capability of real-time imaging, capability of tomography, large penetration depth, small tissue damage and the like.

The invention provides a magneto-optical switch. The magneto-optical switch comprises a single-fiber collimator, a first birefringent crystal, a first half-wave plate component, an optical rotation component, a second half-wave plate component, a second birefringent crystal and a dual-fiber collimator which are sequentially arranged in the optical path direction, wherein the optical rotation component is provided with a refractor; a first Faraday optical rotation piece is arranged on the side of the refractor close to the first half-wave plate component; an optical rotation device is arranged on the side of the refractor close to the second half-wave plate component; the optical rotation component is further provided with a magnetic field producer positioned outside the first Faraday optical rotation piece; the single-fiber collimator is a single-core beam-expanding fiber collimator with a beam-expanding optical fiber mounted therein; and the dual-fiber collimator is a dual-core beam-expanding fiber collimator with two beam-expanding optical fibers mounted therein. The magneto-optical switch provided by the invention adopts smaller devices, and the birefringent crystals and the optical rotation component are both small in size, so that the size of the magneto-optical switch is reduced and the manufacturing cost of the magneto-optical switch is lowered.

A plasmon generator has an outer surface including a plasmon exciting part, and has a near-field light generating part located in a medium facing surface. The plasmon exciting part faces an evanescent light generating surface of a waveguide's core with a predetermined distance therebetween. The outer surface of the plasmon generator further includes first and second inclined surfaces that are each connected to the plasmon exciting part. The first and second inclined surfaces increase in distance from each other with increasing distance from the plasmon exciting part. The plasmon generator includes a shape changing portion where the angle of inclination of each of the first and second inclined surfaces with respect to the evanescent light generating surface increases continuously with decreasing distance to the medium facing surface.

Provided are a high-precision selective laser sintering method and device for an ultraviolet point light source. An ultraviolet laser is adopted, a printing model is generated through a computer, and signals are output through control software, thus movement of a scanning galvanometer is controlled, the point light source is formed by laser in a forming cylinder, and powder sintering forming is carried out. The device comprises a preheating system and a powder laying device, the preheating system and the powder laying device are connected with the computer, and the computer is connected with the ultraviolet laser and the scanning galvanometer. The method and device have the advantages that the light spot diameter is small, the heat affected area is small, single photon energy is large, the processing precision is high, the forming quality is good, the processing material range is wide, and the like.

Disclosed is an optical probe for obtaining a micro spot light, comprising a rod-like glass body having a rectangular cross section as a core for propagating a light wave. The distal end portion of the glass body is gradually diminished toward the distal end so as to form a micro distal end face having a small diameter. The side surface of the distal end portion of the glass body in a direction perpendicular to the polarized direction of the light wave is coated with a light absorber formed of a metal film.

The solid immersion lens for near field optical storage has one negative refraction medium layer coated to the lower surface of traditional solid immersion lens to re-focus laser beam focused onto the lower surface of the solid immersion lens onto the surface of CD. During using, the negative refraction medium layer and the air gap have relative dielectric constant and magnetic permeability matched under the work wavelength, and the air gap is designed in the same thickness as the negative refraction medium layer. In the condition without lowering the signal response in reading data and the resolution in reading / writing data, the present invention increases the distance between the lower surface of the solid immersion lens and the CD to relax the requirement on servo system, mechanical transmission system and record environment.

Disclosed is an optical probe for obtaining a micro spot light, comprising a rod-like glass body having a rectangular cross section as a core for propagating an light wave. The distal end portion of the glass body is gradually diminished toward the distal end so as to form a micro distal end face having a small diameter. The side surface of the distal end portion of the glass body in a direction perpendicular to the polarized direction of the light wave is coated with a light absorber formed of a metal film.

A plasmon generator has an outer surface including a propagation edge, and has a near-field light generating part lying at an end of the propagation edge and located in a medium facing surface. The propagation edge faces an evanescent light generating surface of a waveguide's core with a predetermined distance therebetween and extends in a direction perpendicular to the medium facing surface. The propagation edge is arc-shaped in a cross section parallel to the medium facing surface. The plasmon generator includes a shape changing portion in which a radius of curvature of the propagation edge in the cross section parallel to the medium facing surface continuously decreases with decreasing distance to the medium facing surface.

The purpose of the present invention is to inspect the position, number, and size of fine defects in a variety of solid state materials, including a semiconductor device and metallic materials, with a high spatial resolution of nanometer order. The positron irradiation function is installed in the converged electron beam apparatus. The defect location information is obtained from the converged electron beam location information, and the number and size of defects are obtained from the detected information of γ-rays created by pair annihilation of electrons and positrons, and this two-dimensional distribution information is displayed in the monitor. Information on ultra-fine defects in a crystal can be provided with high-speed and high-resolution, and nondestructively in the case of a semiconductor wafer.

The invention relates to the technical field of a self-adaptive optical system, and in particular to a sodium guide star laser atmospheric link compensation system. The system comprises a first laserbeam expanding system, a second laser beam expanding system, a dichroic mirror, a deformation mirror, a beam combining and expanding system, a wavefront detection and control system, a reflecting mirror and a calibration light source. According to the system, another laser different from the sodium laser wave length and the sodium laser combining beam are emitted in common-caliber and are converged on an atmospheric layer of a sodium laser transmission path to generate atmospheric back scattering; the atmospheric turbulence distortion is measured and compensated by using a back-scattering image; when the sodium laser emits, the phase distortion opposite to the atmospheric turbulence is carried and counteracted when the laser passes through the atmospheric turbulence so that the sodium laser has flat wavefront distributions, smaller light spot diameter and higher energy density when reaching the sodium layer for convergence, thereby being beneficial to reducing the measurement error ofthe self-adaptive optical system of the ground-based optical telescope and improving the imaging correction effect.

The invention relates to a marking method and a marking device. The marking device is used for removing anodic aluminum oxide on a product. The marking device comprises a laser, a fixed seat, a beam expander, a galvanometer and a focusing lens; the laser is used for generating a laser beam; the fixed seat is provided with a through hole; the beam expander is arranged on the fixed seat, is opposite to the laser, and is used for enlarging the diameter of the laser beam; the galvanometer is arranged on the fixed seat, and is close to the beam expander; the galvanometer is used for deflecting the laser beam output by the beam expander, so as to allow the laser beam to pass the through hole; and the focusing lens is arranged on the fixed seat, is located on one side, departing from the galvanometer, of the fixed seat, and corresponds to the through hole. According to the marking method and the marking device, the laser beam generated by the laser is subjected to combined action of the beam expander and the focusing lens, and then the power density of the laser beam acting on the surface of the product is increased substantially, so that a situation that no product after being marked generates stress deformation is ensured, and the product has good conductivity.

A thermally assisted magnetic head includes a main magnetic pole layer, a near-field light generating layer having a generating end part generating near-field light arranged within a medium-opposing surface, and an optical waveguide guiding light to the near-field light generating layer. The thermally assisted magnetic head includes a base layer which a base groove part having a width gradually getting smaller along a depth direction and extending in an intersecting direction intersecting with the medium-opposing surface is formed. The near-field light generating layer has an in-groove generating layer formed inside of the base groove part. The in-groove generating layer is formed along an inner wall surface of the base groove part and has a thin-film like structure.

A near-field light generator includes: a waveguide; a clad layer having a penetrating opening and disposed on the waveguide; a plasmon generator accommodated in the opening; and a dielectric film interposed between the plasmon generator and each of the waveguide and the clad layer. In a method of manufacturing the near-field light generator, an initial clad layer is initially formed on the waveguide, and then the initial clad layer is taper-etched by RIE to form a recess that does not reach the top surface of the waveguide. Subsequently, the recess is etched by wet etching until the top surface of the waveguide is exposed in part. Next, the dielectric film is formed in the opening, and the plasmon generator is formed on the dielectric film.

The invention relates to a precise wire circuit and a preparation method thereof. The preparation method comprises the following steps of (1) preparing paste, wherein the paste comprises metal ions and a reducing agent; (2) laying the paste on a surface of a substrate; (3) irradiating the paste with laser, and reducing the metal ions to elemental metal so as to form a circuit; and (4) cleaning thepaste which is not reacted, and obtaining the precise wire circuit. According to the preparation method (direct-writing technology) of the precise wire circuit, a method for forming the circuit or aconductive pattern through chemical or photochemical reaction between the substrate and the paste by means of an optical effect or a heat effect of the laser on a surface of the substrate and the paste is employed, the direct-writing technology is high in accuracy, a mask is not needed, and the direct-writing technology is applicable to an arbitrary substrate.

While a plurality of drive currents for flying height setting with current values smaller than a tentative optimum drive current are supplied to a light source, respectively, heater power is supplied to a heater part, and touch down of a thermally-assisted magnetic recording head is detected. Tentative optimum heater power is determined based on a correlation between the heater power when the touch down is detected and each drive current for flying height setting. The tentative optimum drive current is supplied to the light source part; the tentative optimum heater power is supplied to the heater part; a reference signal is recorded in a magnetic recording medium; and flying height of the thermally-assisted magnetic recording head is set by determining whether or not the reference signal is recorded with the desired signal intensity.

The invention belongs to the field of sensors, and aims to effectively reduce the diameter of a light spot and improve the timing resolution of an optical fiber type tip timing sensor. According to the technical scheme adopted in the invention, an optical fiber bundle type tip timing sensor based on a self-focusing lens is characterized in that a plurality of multi-mode optical fibers closely surround one single-mode optical fiber to form an optical fiber bundle; the self-focusing lens is assembled at the front end of the optical fiber bundle; the single-mode optical fiber is connected with alaser and a photoelectric receiver through a circulator; the multi-mode optical fibers are only connected with the photoelectric receiver; laser light emitted by the laser is projected onto the end face of a blade through the single-mode optical fiber and the self-focusing lens; and laser light reflected by the end face of the blade passes through the self-focusing lens, and is projected onto thephotoelectric receiver through the single-mode optical fiber and the multi-mode optical fibers. The optical fiber bundle type tip timing sensor is mainly applied to the design and manufacturing occasions of optical fiber sensors.

A thermally assisted magnetic head includes a main magnetic pole layer, a near-field light generating layer having a generating end part generating near-field light arranged within a medium-opposing surface, and an optical waveguide guiding light to the near-field light generating layer. The thermally assisted magnetic head includes a base layer which a base groove part having a width gradually getting smaller along a depth direction and extending in an intersecting direction intersecting with the medium-opposing surface is formed. The near-field light generating layer has an in-groove generating layer formed inside of the base groove part. The in-groove generating layer is formed along an inner wall surface of the base groove part and has a thin-film like structure.

The invention discloses a matrix-assisted laser desorption ionization time-of-flight mass spectrometer and a sample detection method. The mass spectrometer comprises a sealed shell for forming a vacuum cavity, a laser positioned outside the sealed shell, a target plate contained in the sealed shell, a modulation electrode set, a first deflection electrode set, a first reflecting mirror, a flight tube and a detector, wherein the laser is used for emitting laser beams to the sealed shell; the first reflecting mirror is used for reflecting the laser beams to enable the laser beams to vertically irradiate a sample placed on the target plate; the modulation electrode set is used for modulating ion beams emitted by gasification and ionization of the sample under the vertical irradiation of the laser beams, and the ion beams contain effective ions, neutral particles and non-selective ions; and the first deflection electrode set is used for generating a first electric field to deflect a flight direction of the effective ions in the modulated ion beams, so that the effective ions subjected to flight direction deflection enter one end of the flight tube in the axial direction of the flight tube and are received by the detector arranged at the other end of the flight tube.

In order to provide an electron gun capable of maintaining a small spot diameter of a beam converged on a sample even when a probe current applied to the sample is increased, a magnetic field generation source 301 is provided with respect to an electron gun including: an electron source 101; an extraction electrode 102 configured to extract electrons from the electron source 101; an acceleration electrode 103 configured to accelerate the electrons extracted from the electron source 101; and a first coil 104 and a first magnetic path 201 having an opening on an electron source side, the first coil 104 and the first magnetic path 201 forming a control lens configured to converge an electron beam emitted from the acceleration electrode 103. The magnetic field generation source is provided for canceling a magnetic field, at an installation position of the electron source 101, generated by the first coil 104 and the first magnetic path 201.

The invention relates to the technical field of solar cells. Aiming at the problems of high electrode cost and low photoelectric conversion efficiency of an N-type Topcon battery, it discloses an N-type Topcon battery with double-sided aluminum paste electrodes and a preparation method thereof. The front of the battery is provided with a front Silver main grid and front aluminum fine grid, and the back of the battery is equipped with a rear silver main grid and a rear aluminum fine grid; the preparation method of the above-mentioned battery: texture → B diffusion → BSG removal → alkali polishing → back LPCVD deposition of tunnel oxide layer and polysilicon Layer → rear P diffusion → PSG removal → winding plating → front AlO x layers and SiN x h y Layer Deposition → Backside SiN x h y Deposition → front / back UV laser ablation → screen printing. In the present invention, the front / back side is printed with aluminum paste to obtain aluminum grid lines and segmented silver busbars; the back side aluminum paste is replaced by silver paste to form a good field passivation effect, thereby increasing the diffusion length of carriers, improving battery Voc, and reducing battery life. production cost.

A focusing output structure of a high-power semiconductor laser includes a focusing lens (10) for focusing a plurality of laser beam spots superposed after beam shaping; Characterized in that an aperture (20) is arranged behind the focusing lens (10) to control the diameter of the focused beam and the light transmission angle; An optical fiber output head (30) is arranged at the focal position ofthe focusing lens (10) to receive the focused light beam and realize the optical fiber transmission of the high-power laser. The invention adopts the diaphragm to optimize the spherical aberration ofthe focusing lens, the optical spot diameter and the light transmission angle at the output end of the optical fiber are limited initially, Effectively reduce the number of invalid light fiber outputhead, further reduce the temperature at the fiber output head, effectively improve the stability of the device, at the same time, the limiting effect of the aperture, can effectively improve the laserbeam quality of semiconductor laser output.

The invention discloses a laser beam combining device and processing equipment. The laser beam combining device comprises a laser device array and a first reflecting piece, the laser device array reflects at least two laser beams to the first reflecting piece, the first reflecting piece is provided with at least two reflecting surfaces which are in a step shape and are arranged in parallel, the reflecting surfaces both face the laser, and each reflecting surface corresponds to one laser beam; the reflecting surface of the first reflecting piece is arranged in an ascending step shape in the Y-axis direction, and the Y-axis direction is the laser beam direction after the laser beam is reflected by the first reflecting piece. In this way, the laser beam quality can be improved.

The invention discloses a femtosecond laser processing device. In the laser optical path direction, a femtosecond laser device, a horizontal optical path device, a vertical optical path device, a laser processing device and a processing platform are sequentially included. The diameter of light spots of a laser is reduced through utilization of the femtosecond laser device. A probe is arranged in the horizontal optical path device, and a mini-type camera is arranged in the laser processing device, so that the states of a laser beam and a sample are observed in real time. A first reflector, a second reflector, a third reflector, a fourth reflector and a fifth reflector are arranged in the horizontal optical path device so that devices, located among the reflectors, in the horizontal optical path device can be reasonably arranged, and the structure of the processing device is more compact. Sliding platforms in the X direction, the Y direction and the Z direction are arranged on the processing platform so that the processing platform can be moved and adjusted in the processing process.

The invention relates to the field of laser technologies, nonlinear optical physical technologies, quantum optics technologies and quantum communication technologies, in particular to a compact singlecrystal thin cavity and an entangled photon source system using the same. The free spectral path range (FSR) and the line width delta v of the compact single crystal thin cavity satisfy the followingformulae as shown in the description. The compact single crystal thin cavity adopts a very thin nonlinear crystal single-cavity structure, and has the advantages of being small in size and easy to control; the proper cavity length l and coating parameters are selected, wherein the coating parameters are used for adjusting the transmittance T; and by only satisfying the formula (2), the required photonic line width can be freely designed. Moreover, due to the resonance effect of the compact single crystal thin cavity, the spectral brightness of generated photons is greatly enhanced relative tothe spectral brightness during single pass; the surface is subjected to theoretical calculation; and an enhancement factor of the spectral brightness of photon pairs generated by the compact single crystal thin cavity relative to the spectral brightness during the single pass is in direct proportion to the square (F<2>) of the fineness of the compact single crystal thin cavity.