516 results about "Laser intensity" patented technology

Powerful nanosecond-range lasers using low repetition rate pulsed laser deposition produce numerous macroscopic size particles and droplets, which embed in thin film coatings. This problem has been addressed by lowering the pulse energy, keeping the laser intensity optional for evaporation, so that significant numbers of the macroscopic particles and droplets are no longer present in the evaporated plume. The result is deposition of evaporated plume on a substrate to form thin film of very high surface quality. Preferably, the laser pulses have a repetition rate to produce a continuous flow of evaporated material at the substrate. Pulse-range is typically picosecond and femtosecond and repetition rate kilohertz to hundreds of megahertz. The process may be carried out in the presence of a buffer gas, which may be inert or reactive, and the increased vapour density and therefore the collision frequency between evaporated atoms leads to the formation of nanostructured materials of increasing interest, because of their peculiar structural, electronic and mechanical properties. One of these is carbon nanotubes, which is a new form of carbon belonging to the fullerene (C60) family. Carbon nanotubes are seamless, single or multishell co-axial cylindrical tubules with or without dome caps at the extremities. Typically diameters range from 1 nm to 50 nm with a length >1 mum. The electronic structure may be either metallic or semiconducting without any change in the chemical bonding or adding of dopant. In addition, the materials have application to a wide range of established thin film applications.

A frequency swept laser source for TEFD-OCT imaging includes an integrated clock subsystem on the optical bench with the laser source. The clock subsystem generates frequency clock signals as the optical signal is tuned over the scan band. Preferably the laser source further includes a cavity extender in its optical cavity between a tunable filter and gain medium to increase an optical distance between the tunable filter and the gain medium in order to control the location of laser intensity pattern noise. The laser also include a fiber stub that allows for control over the cavity length while also controlling birefringence in the cavity.

The invention provides an adaptively adjusted laser projection module. The module comprises a light source, a specific optical element, a pattern generator and a light beam detector. The specific optical element comprises at least one light dividing face, wherein each light dividing face is used for reflecting and transmitting at least parts of light beams emitted by the light source. The pattern generator receives light beams parts of which are reflected or transmitted through the light dividing face, and externally emitting structure light patterns. The light beam detector is used for receiving the light beams parts of which are reflected or transmitted through the light dividing face, and detecting the intensity of the light beams. The invention also provides a depth camera. The depth camera comprises the adaptively adjusted laser projection module and is used for projecting structuralized light beam images towards a target space. According to the invention, by use of the specific optical element having the reflection and transmission functions, the laser projection module has quite small size; and by combining an optical detector, the light source can be detected anytime and anywhere, so laser intensity can be further controlled and damage to human is avoided.

The invention relates to the technical field of airborne laser radar data processing, in particular to a semi-supervised classification method for airborne laser radar data fusing images. In the method, based on a semi-supervision concept, rough classification results of point cloud data are utilized to extract high-accuracy training sample data which is used for classifying high-resolution images; and in the post-processing process, based on target complexity, spurious building points are removed, the classification results are refined, and LiDAR (Laser Intensity Direction and Ranging) pointcloud multiple characteristics are fused for cross validation so as to finally realize fine classification of airborne laser radar data. The method is a fusion classification method with high reliability and high classification accuracy. In the precondition without using near infrared data, the method achieves good effect of classification for point cloud tall vegetation and low vegetation areas.

A surface mapping and generating device which has devices for the process and / or cost optimization, in particular raw material recovery devices, an automatic control of the intensity of a used laser light, devices for carrying out a calibrating procedure by evaluating overlap errors at matching points, devices for archiving especially three-dimensional data of the jaw and / or for modeling the bite position of the upper and the lower jaws, devices for the optimized preparation of at least one dental stump for the production and placement of a dental prosthesis thereon and / or devices for taking into consideration the bite position of the upper and lower jaws. It can be provided that the devices for the process and / or cost optimization are designed to ensure that two half frames showing different positions or views are evaluated, whereby preferably a pulsed laser for exposure purposes is included and / or that an image recording device, in particular a CCD chip, is arranged so as to ensure that lines, taking into account the Scheimpflug angle, are located perpendicular to the direction of travel of a measuring table. Methods according to the present invention use such devices and function correspondingly. In addition, the invention also makes available a patient data archiving system which comprises a chip card and / or decentralized data storage systems especially for dental data.

The invention relates to a gas parameter online measurement method based on wavelength modulation spectroscopy and belongs to the field of tunable diode laser absorption spectroscopy. According to the method, a gas absorptivity function is fitted by using an odd number of harmonic signals of an X axis and a Y axis output by a phase-locked amplifier based on the wavelength modulation spectroscopy, normalization processing is carried out on the harmonic signals of the X axis and the Y axis by using first harmonic background signals so as to eliminate the influence of factors, such as background signal, laser intensity and modulation factor, and then, the temperature, concentration, pressure and spectroscopic constant of gas are directly measured by using the gas absorptivity function. The gas parameter online measurement method based on the wavelength modulation spectroscopy has the advantages that the problem that the wavelength modulation spectroscopy needs to calibrate experimental measuring temperature and concentration and cannot measure the pressure and spectroscopic constant of gas nowadays is solved, and the application range of the wavelength modulation spectroscopy is widened.

The invention discloses a high-precision urban three-dimensional modeling method integrating an airborne LIDAR (Laser Intensity Direction And Ranging) technology and a vehicle-mounted mobile laser scanning measurement technology, comprising the following steps of: firstly, acquiring high-precision three-dimensional laser point clouds and high-resolution digital aerial photos of a measuring region by adopting airborne LIDAR, fast extracting a high-precision digital elevation model and a digital orthoimage product, carrying out high-precision modeling on a building to make the scenes of an urban three-dimensional electronic sand table and an urban three-dimensional building body frame model; secondly, completing the acquisition of the high-density laser point clouds and high-precision digital photos of urban scenes positioned at both sides of a road of the measuring region by adopting vehicle-mounted mobile laser scanning measurement, carrying out the quality optimization of vehicle-mounted data by referring to airborne LIDAR results, and then fast carrying out three-dimensional modeling on various urban piece elements; and finally integrating three-dimensional digital model results acquired through the airborne LIDAR and the vehicle-mounted mobile laser scanning measurement, therefore the quality and the work efficiency of the urban three-dimensional modeling are greatly enhanced. The invention can greatly reduces the development cost of projects.

The invention discloses a display panel and a manufacturing method thereof. The display panel comprises a substrate, the substrate comprises a display area and a surrounding area surrounding the display area, and the display panel further comprises at least one layer of protective layer covering the cutting area corresponding to a cutting line of the surrounding area. The display panel has the advantages that the protective layer is arranged at the edge of the surrounding area, the protective layer can absorb laser energy and release impact force when the laser technology is used subsequentlyfor cutting, edge film layers are prevented from being heated and impacted to generate cracks spreading to the display area, and problems that the film layers of the cutting area is prone to cracks due to excessive laser intensity in the existing technology and the cracks conduct inward into the display area to affect the display are solved.

Laser amplification methods and apparatuses. With the invention, one can increase laser intensity on a target by computing a distance to the target, based upon the distance determining an ultra short laser pulse that will in traveling through a medium compress to approximately a minimum width, and emitting the pulse at the target, whereby an intensity of the pulse is approximately maximized upon contact with the target. One can also amplify and detect a laser return signal by receiving the laser return signal, amplifying the received return signal by optical parametric amplification and detecting the amplified signal. One can further perform spectroscopy by determining an ultra short laser pulse such that the pulse compresses and then expands in traveling through a medium, emitting the pulse at a target, and performing spectroscopic analysis of the pulse after propagation.

The invention discloses a method for measuring the gas absorption spectrum line width and the line-type coefficient based on wavelength modulation. According to the method for measuring the gas absorption spectrum line width and the line-type coefficient based on the wavelength modulation, the specific value between a two-time harmonic and a four-time harmonic in the wavelength modulation spectrum technology are adopted to measure the line width and the line-type coefficient of the spectral line absorbed by the gas. During measurement, the line width and the line-type of the gas absorption spectrum line to be measured are calculated by means of analysis of the specific value between the two-time harmonic and the four-time harmonic. The method for measuring the absorption gas spectrum line width and the line-type coefficient based on the wavelength modulation has the advantages of being easy to operate, high in measuring precision, and capable of eliminating influence of factors such as background signals, laser intensity fluctuation and the photoelectricity amplification coefficient, solving the problem that an existing WMS technology can not accurately measure the line-type parameters absorbed by the gas and broadening the application range of the WMS technology and the like. Due to the fact that the specific value between the two-time harmonic and the four-time harmonic are adopted to calculate the gas absorption line-type parameters, the method for measuring the gas absorption spectrum line width and the line-type coefficient based on the wavelength modulation can be called the R24 method.

The invention relates to the field of two-phase / multi-phase flow measurement, aims to realize the non-intrusive and high precision synchronization acquisition of the flow parameters of a liquid film in (outside) a pipeline and temperature field distribution, and is used for the deep study of a liquid film flow characteristic, a heat transfer characteristic and the like. The employed technical scheme is that according to the liquid film temperature field and flow field simultaneous measurement method based on laser induced fluorescence, when a liquid film with dissolved fluorescent dye forms a dynamic liquid film in a pipeline inner / outer wall or a flat panel, a liquid film fluorescence image is taken through a high speed camera, for a same taken fluorescence image, based on a high speed calibration parameter, the geometric feature of the liquid film fluorescence image is accurately extracted, and flow field characteristics comprising a liquid film thickness and a velocity are obtained. At the same time, based on a calibrated temperature-fluorescence intensity calibration curve, laser intensity calibration and a fluorescence intensity extraction method, a liquid film fluorescence image brightness is accurately extracted, and the instantaneous and time averaged temperature field distribution of the liquid film are obtained. The method is mainly applied to a two-phase / multi-phase flow measurement occasion.

The bio-sample (e.g., a live cell) is labeled with a proper number of nanoparticles. Each nanoparticle is pre-co-doped with a controlled ratio of fluorophore donors and acceptors. Two laser pulses are applied to the bio-sample. The first laser pulse has a center wavelength near the peak of absorption spectrum of acceptors. The intensity of first laser pulse is adjusted such that FRET saturation occurs near the center of the focal spot. The focal spot of the first laser pulse is a diffraction-limited Airy disk that has the highest laser intensity in the center of the focal spot. The second laser has a center wavelength in the emission spectrum of acceptors and with a uniform intensity distribution throughout the focal spot. The fluorescence emission from acceptors after two laser pulses is from an area that is smaller than the diffraction-limited focal spot. Hence, a higher than diffraction-limit resolution is achieved.

The invention discloses a digital line graph mapping method, relating to the fields of mapping and remote sensing. The digital line graph mapping method comprises the following steps of: verifying flight by using onboard LIDAR (Laser Intensity Direction and Ranging) equipment to realize calibration of equipment parameters; establishing a point cloud data error model according to an onboard LIDAR point cloud generation principle, acquiring a parameter correction value according to overall adjustment to realize integral accuracy optimization for point cloud data, and acquiring a point cloud with optimized accuracy; carrying out filtering and sorting treatment on the ground and buildings, acquiring a ground point cloud and a building point cloud, and establishing a digital ground model according to the ground point cloud; carrying out aerial triangulation encryption on an air photo according to the digital ground model and POS (Position and Orientation System) auxiliary positioning information to realize integral accuracy optimization for fixed-position and fixed-attitude data of the air photo, and acquiring the air photo with optimized accuracy; accurately matching the point cloud with the optimized accuracy and the air photo with the optimized accuracy; and establishing a mapping environment of a point cloud and air photo fused mode, realizing semi-automatic extraction of vector lines and total-manual extraction of residual ground feature elements in the fused mode mapping environment, and generating a digital line graph product.

A laser transmitting system includes a laser source configured to transmit a laser beam at an original transmit intensity. The system also includes a laser intensity adjusting mechanism positioned in the path of the transmitted laser beam. The laser intensity adjusting mechanism is controllable to reduce the intensity of the laser beam from the original transmit intensity. The system also includes a controller coupled to the laser intensity adjusting mechanism. The controller is configured to automatically control the laser intensity adjusting mechanism based upon a safety criteria. Methods of controlling a laser transmitting system are also provided.

The invention discloses a Watt-level all-solid ultraviolet laser cleaner and a laser cleaning method, which pertains to the optical energy cleaning technology field and are applied to cleaning micro electronic substrate such as the integrated circuit. The power of the cleaner is connected with a laser resonance chamber; two non-linear optical crystals, a selective microscope and a reflector are positioned in the light path of pulsed laser from the laser resonance chamber; a rotating mirror drum is fixed above one side of the reflector; a work piece to be cleaned is arranged on a convey belt; a blower is positioned at one side of the convey belt and a cleaner is arranged at the other side. By adopting the method, substrates to be cleaned can be continuously or discontinuously conveyed to go through the laser which is Watt-level pulse laser with about 266nm and comes from the all-solid laser; proper laser intensity, pulse frequency and irradiation time can be controlled to effectively remove micron and submicron particles, organics, oily contamination, etc. on the surface of the substrate. The adhesion of the coating after cleaning and the product yield rate are greatly improved and the warp or spalling of the coating rarely happens.

The invention discloses a composite multi-harmonic-based online gas concentration measurement method and belongs to the technical field of tunable diode laser absorption spectroscopy (TDLAS). The method comprises the following steps: determining the line width of an absorption line by virtue of a ratio of second harmonics to quadruple harmonics, and calculating to obtain a linear function; and calculating the gas concentration according to a deduced ratio of second harmonics to first harmonics under strong absorption conditions. According to the method, the gas concentration is measured under the strong absorption conditions by the second and first harmonic signal mark-free method of absorption signals, the influence of laser intensity fluctuation, photoelectric amplification factors and other factors is eliminated, the signal to noise ratio and measurement accuracy are improved, the problem that a concentration measurement error is caused in a wavelength modulation method because the linear function of the absorption line is uncertain is effectively solved, the gas concentration measurement accuracy is improved, and the application range of the TDLAS technology is widened.

The invention relates to a laser welding tractable polycarbonate composition and a preparation method thereof. The composition comprises the following components in parts by weight: 50-80 parts of polycarbonate (PC) resin, 15-40 parts of ABS resin, 5-10 parts of amelt reinforcing agent, 0.1-1 part of a near infrared laser absorbent, 0.1-1 part of an antioxidant and 0.1-1 part of a lubricant. The preparation method of the alloy comprises the following steps: (a) mixing the PC resin, the ABS resin, the melt reinforcing agent, the near infrared laser absorbent, the antioxidant and the lubricant in a mixing agitator; and (b) performing blending granulation on the mixture obtained in the step (a) by virtue of a twin-screw extruder to obtain a product. Compared with the prior art, the polycarbonate composition provided by the invention is higher in melt strength after the melt reinforcing agent is added, so that the surface of a product after welding has no bulges orbreakdowns, welding can be performed under a higher laser intensity, the obtained product is higher in welding strength at the same time, a processing window of a laser welding process of the polycarbonate composition is broadened, and the laser welding tractable polycarbonate composition is obtained.

The combination of a rooftop optical element and a soft edge aperture stop, as well as the introduction of a negative spherical aberration in a positive focusing lens, improve working distance and depth of focus in both moving beam and imaging readers for electro-optically reading indicia such as bar code symbols, especially for close-in symbols, and moreover tend to reduce undesirable light intensity modulation in the beam profile thereby improving reader performance.

The invention provides a device and method for detecting the residual reflection of a neodymium glass wrapping. The device comprises a first laser; a light beam shaping lens group, a beam splitter and a sample are arranged in sequence along the laser output direction of the laser; a laser intensity detector is arranged in the reflected light direction of the beam splitter; a residual reflection light detector is arranged in the wrapping residual reflected light direction of the sample; and the output end of the laser intensity detector and the residual reflected light detector are connected with the input end of a data processing system. The device and the method have the following characteristics of simple structure, convenience in use and high measuring precision.

A new technique and Method of Direct Coulomb Explosion in Laser Ablation of Semiconductor Structures in semiconductor materials is disclosed. The Method of Direct Coulomb Explosion in Laser Ablation of Semiconductor Structures provides activation of the “Coulomb explosion” mechanism in a manner which does not invoke or require the conventional avalanche photoionization mechanism, but rather utilizes direct interband absorption to generate the Coulomb explosion threshold charge densities. This approach minimizes the laser intensity necessary for material removal and provides optimal machining quality. The technique generally comprises use of a femtosecond pulsed laser to rapidly evacuate electrons from a near surface region of a semiconductor or dielectric structure, and wherein the wavelength of the laser beam is chosen such that interband optical absorption dominates the carrier production throughout the laser pulse. The further application of a strong electric field to the semiconductor or dielectric structure provides enhancement of the absorption coefficient through a field induced redshift of the optical absorption. The use of this electric field controlled optical absorption is available in all semiconductor materials and allows precise control of the ablation rate. When used in conjunction with nanoscale semiconductor or dielectric structures, the application of a strong electric field provides for laser ablation on sub-micron lateral scales.

The invention discloses a hybrid integrated composite cavity wave length-tunable laser transmitter. Optical waveguides of a passive photonic chip sequentially comprise phase control regions, a first reflection grating, a phase coupling region and a second reflection grating, and a tunable laser outer cavity is formed by the phase control regions, the first reflection grating, the phase coupling region and the second reflection grating. Optical waveguides connecting the phase coupling regions are Y-branch waveguide couplers of two asymmetrical waveguide arms, wherein the second reflection grating is arranged on one waveguide arm, and a waveguide laser intensity modulator is arranged on the other waveguide arm; tunable lasers are output from the middle of a composite reflection mirror in a light split mode, and is then transmitted and output at the speed modulated according to the laser intensity of the lasers from a port of the waveguide arm provided with the waveguide laser intensity modulator. Because the second reflection grating and the waveguide laser intensity modulator are arranged on the two Y-branch waveguide couplers of the two asymmetrical waveguide arms respectively, the size of the hybrid integrated composite cavity wave length-tunable laser transmitter is reduced; the waveguide laser intensity modulator can achieve high-speed laser transmission.

The embodiment of the invention discloses a point cloud detection method and device, computer equipment and a storage medium. The method comprises the following steps: acquiring multiple frames of point clouds and multiple frames of original image data which face the same visual range and are acquired at the same time; respectively projecting the multiple frames of point clouds onto the multiple frames of original image data to obtain multiple frames of target image data; performing semantic segmentation on point clouds and pixel points in the target image data according to the time sequence relationship among the multiple frames of target image data so as to identify the semantic information of the pixel points for the obstacle; and endowing the semantic information of the pixel points with point clouds corresponding to the pixel points. The visual features of the image data are combined with the spatial features of the point cloud, the target image data not only contains rich color features and texture features, but also contains the coordinates of the point cloud, the laser intensity and other features, the dimensionality of the features is greatly enriched, and semantic segmentation is carried out by considering the time sequence between frames, so that the accuracy of semantic information of an obstacle is improved.

A method and system for laser cladding includes determining a material thickness variation of a substrate, and varying laser intensity dependent on the determination of the material thickness variation of the substrate. The determination of the material thickness variation of the substrate includes calculating parameters indicative of a relative material thickness between a first target position and a second target position.

A multi-channel laser interferometric method and apparatus are provided for optically measuring transient motion from a surface (17). A laser beam (11) is generated and then divided into first and second beams having respective intensities representing minor and major fraction of the predetermined laser intensity. The reference beam (18) illuminates the surface (17) at which deformation is expected. The light back-scattered by the surface is collected by a single aperture lens (15) and then made to interfere with the probe beam (67) which has been expanded (32), onto a two-dimensional array of detectors (71). Each signal (83) corresponding to each detector of the array is converted individually to an electrical signal, each electrical signal is amplified and processed (84), and the plurality of processed signals (85) is then averaged in an electrical summing means (45).

The invention discloses a full-light-path light intensity stable-controlling system of an SERF atomic self-spinning top. A liquid crystal phase delayer is utilized to inhibit pumping laser of the SERFatomic self-spinning top and detect the light intensity variation of the laser, and thus the stability of output signals of the SERF atomic self-spinning top is improved. According to the method, a photoelectric detector is firstly utilized to detect laser split by a beam splitter prism from a main pumping laser and detection laser path, detection signals are fed back to a digital controller through an analog-digital converter (ADC), the digital controller produces a PID control law based on a PID algorithm, the phase delay amount of the liquid crystal phase delayer is controlled through a digital-analog converter (DAC), control of laser intensity transmittance is achieved, and thus stable control of the intensity of pumping laser and detection laser is achieved. The beam splitter prism is arranged behind a photoelastic modulation module in a detection light path, thus the detection laser intensity variation before the laser enters an alkali metal air chamber is inhibited, stable control of full-light-path light intensity of the SERF atomic self-spinning top is achieved, the meanwhile miniaturization of the SERF atomic self-spinning top is facilitated.

Provided is a microscope and an observation method which can improve spatial resolution. A microscope according to an aspect of the invention includes a laser light source (10), an objective lens (16) that focuses light from the laser light source on a sample, and a detector (22) that detects the laser light as signal light from a sample (17) when the sample (17) is irradiated with the laser light. The light is applied to the sample with an intensity changed to obtain a nonlinear region where intensities of the light and the signal light have a nonlinear relation due to occurrence of saturation or nonlinear increase of the signal light when the light has a maximum intensity, and the detector (22) detects the signal light according to the intensity of the laser light to perform observation based on a saturation component or a nonlinear increase component of the signal light.

The invention specifically relates to a secondary electro-optic crystal with a gradient refractive index effect as well as a preparation method and an application method of the secondary electro-optic crystal. The secondary electro-optic crystal is an ion doped electro-optic crystal with a general formula of M: KTa[1-x]NbxO3, and has a perovskite structure, wherein M=Cu<2+>, Fe<3+>, Sn<4+>, Ni<2+>, Ti<4+>, Na<+> and Li<+>, and the content of M is 0-5at%; the content x of Nb in a crystal component is more than or equal to 0 and less than or equal to 5, a curie point is positioned between -241 and 90 DEG C, the crystal above the curie point is a cubic phase and an m3m point group; and the crystal below the curie point becomes a tetragonal phase and a 4mm point group, a matrix component Ta / Nb is uniformly distributed in the crystal, doped ions M are in non-uniform distribution in the crystal, and the concentration distribution changes linearly along the growth direction of the crystal. The invention realizes functional combination of an electro-optic effect and a gradient refractive index effect of the crystal, and respectively realizes modulation of propagation direction and intensity of laser in different directions of the same modulation sample.