39 results about "Spot intensity" patented technology

The invention discloses a super-resolution fluorescent lifetime imaging method based on stimulated emission lost. The super-resolution fluorescent lifetime imaging method based on the stimulated emission lost includes the flowing steps: (1) projecting a first laser beam on a to-be-tested sample and activating grains in the to-be-tested sample to an excited sate; (2) utilizing stimulated emission depletion (STED) light to consume the number of the grains which are in the excited state in step (1); (3) utilizing a second laser beam to stimulate the rest grains to emit fluorescent light and collecting the fluorescent light to obtain corresponding fluorescence intensity images; (4) arranging delay between the second laser beam and the STED light, changing delay time, repeating step (3), and obtaining the fluorescence intensity images under different delay time; (5) conducting treatment on the fluorescence intensity images in different delay time through a computer, and fitting a spot intensity attenuation law, inverting lifetime images, and completing scanning of one point of the to-be-tested sample; (6) and completing two-dimension scanning on the sample to be tested by changing the positions where the beam is projected on the to-be-tested sample. The invention further discloses a device used for implementing the method.

The invention discloses a double helix light beam-based sample axial drift detection and compensation method. The method comprises the following steps: performing phase modulation on a collimated laser beam to obtain a double helix illuminating light beam and projecting to a sample to be detected on a three-dimensional nano scanning platform to obtain a reflected light beam; focusing the reflected light beam into a focusing spot with two intensity peak values; receiving the focusing spot by using a photoelectric induction device to obtain spot intensity distribution information; calculating an included angle between a connecting line of the two intensity peak values and the horizontal direction according to the spot intensity distribution information; establishing a calibration function by using the relation of the included angle and axial drift of the sample; when the sample to be detected drifts in axial position, obtaining the axial drift of the current sample according to the calibration function by using the included angle measured in real time and then adjusting the axial position of the three-dimensional nano scanning platform to finish correction of the axial position of the sample to be detected. The invention also discloses a double helix light beam-based sample axial drift detection and compensation device.

A conventional diffractive optical element (DOE), which consists of repetition of a unit pattern Υ, has an advantage of applicability of the Fast Fourier Transform algorithm to calculate diffraction beam spots intensities on lattice points on an image plane. But, the conventional DOE has a drawback of impossibility of diffracting a laser beam off the lattice points. This invention designs a DOE by giving arbitrary complex amplitude transmittance {t_mn} to every pixel (m, n), calculating actual Fourier transform from {t_mn} to intensity W(α, β), and obtaining intensity of a diffraction beam directing in any a and 0 direction. Since α, β are not necessary to be on lattice points, the FFT is of no use. Angular resolutions U and V satisfy inequalities U<λ/aR and V<λ/bS, where λ is a wavelength, aR and bS are the size of the DOE. The DOE can produce multidiffracted beams anywhere on an image and can irradiate a plurality of arbitrary arranged points simultaneously with high precision. The DOE realizes precise multispot microprocessing on arbitrary positions, which is required for producing electronic parts. The DOE is suitable for high speed and low cost laser processing.

The invention discloses a pump source device, a laser source device and design methods thereof. The pump source device outputs hollow pump light, and comprises a ring laser array, a focusing lens, and an optical fiber. The ring laser array comprises multiple lasers distributed annularly, and is used to output multiple laser beams. The focusing lens includes one or more lenses, and is used to converge and couple the multiple laser beams into the optical fiber. The optical fiber is used to output pump light of which the spot intensity is in hollow distribution. The pump source device built according to the technical scheme provided by the invention is simple in principle and reasonable in configuration. Compared with the prior art, no additional light beam conversion element is needed, and the pump source device has the significant advantages of simple optical path, low building difficulty, high optical path stability, low cost, and high feasibility. The laser source device can be pumped by hollow pump light output by the pump source device to obtain hollow laser. The pump source device, the laser source device and the design methods thereof are of great significance to the fields of scientific research and production through use of hollow laser currently.

The invention discloses a sighting device for a light-gas gun simulating hard object damage. The device is characterized in that the device includes a filtering head, a light gas gun barrel and a diode laser; the filtering head is inserted into a stop holder mouth of the light gas gun barrel; the diode laser is inserted into a bullet loading mouth of the light gas gun barrel; and a light beam emitted by the diode laser passes through the filtering head to generate a beam of light coinciding with the axis of the light gun barrel. Beneficial effects achieved by the device are that: the technicalscheme adopts a principle that the diode laser emits a laser beam and a light filter with micropores performs filtering, and so, micro light spots are generated without causing observation difficultydue to insufficient spot intensity; a matching mode with small clearance is adopted between the diode laser, the light gas gun barrel and the filter, thus not only ensuring that an emergent beam is consistent with a ballistic trajectory of an emergent projectile body, but also requirement of easy assembly and disassembly is achieved; and the sighting device not only is fewer in component, is easyto assemble, but also has the advantage of simple and reliable use.

Expression profiling using DNA microarrays is an important new method for analyzing cellular physiology. In “spotted” microarrays, fluorescently labeled cDNA from experimental and control cells is hybridized to arrayed target DNA and the arrays imaged at two or more wavelengths. Statistical analysis is performed on microarray images and show that non-additive background, high intensity fluctuations across spots, and fabrication artifacts interfere with the accurate determination of intensity information. The probability density distributions generated by pixel-by-pixel analysis of images can be used to measure the precision with which spot intensities are determined. Simple weighting schemes based on these probability distributions are effective in improving significantly the quality of microarray data as it accumulates in a multi-experiment database. Error estimates from image-based metrics should be one component in an explicitly probabilistic scheme for the analysis of DNA microarray data.

The invention discloses a welding method of a coaxial diode and a circuit board. A gold-plating copper strip is used as a stress release bridge at the anode of the diode to replace the original solder hard link, so as to solve the problem of stress caused by the longitudinal coefficient of thermal expansion of the circuit board; an In52Sn48 solder is adopted, thus the heat-resistance fatigue capability and uniform elongation are improved, and the reliability of a welding spot is ensured; and the welding area of the cathode of the diode is increased, and the welding spot intensity is ensured by arranging a collet. By utilizing the welding method provided by the invention, the thermal stress caused by different coefficients of thermal expansion of a circuit board material and a diode ceramic body material, and the welding failure or potential hidden danger caused by the thermal stress are resolved, thus improving the quality of the welding spot and the reliability of the product.

The invention discloses a method for generating and measuring a first-order circular Airy derivative light beam with a sudden self-focusing effect and carrying a vortex. The method comprises the following steps: enabling a linear polarization Gaussian beam generated by a laser to pass through a beam expander, a reflector, a beam splitter, a specifically coded reflection type pure phase spatial light modulator, the beam splitter, a circular diaphragm and a Fourier lens in sequence; wherein the distance from the spatial light modulator to the Fourier lens and the distance from the Fourier lens to the Fourier plane/source plane are the focal length of the Fourier lens, and an expected first-order circular Airy derivative light beam carrying a vortex can be obtained on the Fourier plane/source plane; a light beam profile analyzer is mounted on the electric guide rail in the transmission direction of the generated light beam so as to measure intensity distribution and sudden self-focusing capability under different propagation distances; the generated first-order circular Airy derivative beam carrying one vortex has the advantages of hollow focus intensity distribution and carrying orbital angular momentum on the basis of retaining sudden self-focusing capability, and the application range is expanded compared with the first-order circular Airy derivative beam.

For a concurrent ROM-RAM recording medium, the present invention provides an optical information processing apparatus which can accurately read a RAM signal at the time of high-speed transfer without reducing a phase pit depth. The optical information processing apparatus is an optical information processing apparatus for controlling writing and reading of information on a concurrent ROM-RAM recording medium recording ROM signal information as a phase pit on a track and magneto-optically recording RAM signal information on the phase pit, comprising an optical system for forming two (2) first and second beam spots with an interval on the same track of the recording medium; a circuit unit for modulating the first beam spot intensity with a second ROM signal read by the second beam spot; and a circuit for detecting a RAM signal from a first ROM signal read by the first beam spot.

The invention discloses a deep-space micro-area self-adaptive laser spectrum and imaging detection system. The system is composed of a main controller, a spectrometer, an optical fiber, a three-dimensional motor driver, a three-dimensional precision electric platform, a digital pulse delay controller and an optical head. The beneficial effects of the present invention are that an adaptive laser spectrum and imaging detection system is provided, which can adaptively adjust the diameter of the focused spot during micro-area analysis; the regional average grayscale of the electronic eyepiece is used as the intensity of the scanning imaging point, and at the same time It meets the requirements of self-focusing and wide-spectrum scanning imaging; it can simultaneously realize three-dimensional space LIBS elemental analysis, active laser Raman molecular analysis, hyperspectral fluorescence, and visible wide-spectrum scanning imaging, providing a variety of information for fine micro-area detection.

The embodiment of the invention discloses a hotspot distribution detection method and system, and the method comprises the steps: setting a central point in a target region, and detecting hotspots based on all-line antennas; aiming at each detected hot spot, respectively acquiring the hot spot intensity when the four edges of the target area are traversed; and according to the hot spot intensity change rule of each hot spot on each edge of the target area, judging whether the hot spot is in the target area or not. The unnecessary time for positioning the targets one by one is shortened, the detection time of distribution of all hot spots in the area is shortened, and the hot spot distribution detection efficiency is greatly improved.

The invention discloses a beam shaping modulation sheet for quick focusing spot convergence and a method thereof. The beam shaping modulation sheet is an optical filter, the light intensity transmittance distribution is centrally symmetrical, the light intensity transmittance at each place in the radial direction is acquired by adopting an amplitude modulation function for calculation, the modulation sheet is placed in an optical path to filter and shape a beam to acquire a quick-convergence focusing spot. The amplitude modulation sheet is used to change the convergence feature of the focusing spot with little cost and little technical difficulty, the side spot intensity of a diffraction spot is reduced, and great application value and great potential are realized in various fields such as biological imaging and laser optics.

The invention discloses an ultra-short pulse laser far-field focal spot space-time-frequency information acquisition method, and aims to solve the technical problem that chromatic aberration of an existing transmission-type amplification imaging system causes change of far-field focal spot distribution of amplification imaging relative to a target point position. The method comprises: acquiring interference images of a focal plane position, at least one positive defocusing position and at least one negative defocusing position of a measured ultra-short pulse laser through an interference imaging spectrometer; respectively processing each interference image by adopting an interference spectrum imaging technology to obtain corresponding focal spot intensity space-frequency information; reconstructing far-field focal spot space phase two-dimensional information under each frequency in the measured ultra-short pulse laser through a phase recovery technology based on all the obtained focalspot intensity space-frequency information; and finally, reconstructing the obtained two-dimensional information of the spatial phases of all the far-field focal spots according to the size sequence of the frequency to obtain time-space-frequency information of the far-field focal spot phases of the ultra-short pulse laser.

The invention discloses a calibration method for response linearity of a charge coupled device. The present invention utilizes the monochromatic plane light to irradiate the diffraction screen, and converges it through the Fourier lens, uses a charge-coupled device to sample the light spot lattice of the back focal plane of the Fourier lens, and obtains the output gray value of the light spot lattice; the analysis is based on the Fraunhofer diffraction theory The calculated theoretical distribution value of the spot intensity and the output gray value sampled by the charge-coupled device realize the calibration of the response linearity of the charge-coupled device. The method has the characteristics of easy debugging and low cost, and is convenient for engineering realization.