92 results about "Tophat beam" patented technology

The invention provides a new diffractive optical element for shaping a gauss beam into a flat-topped beam, and the diffractive optical element is called DOE for short; the invention also provides a preparation method of the DOE. Grooves or steps with different shapes and sizes are prepared in the center of a quartz substrate, and the DOE is then arranged at the different positions of a light path and is matched with a beam expanding collimation lens and a focusing lens, so that the flat-topped beam can be realized. The DOE has the outstanding advantages of being high in energy transmittance, less sensitive to the incident laser mode change, and simple and flexible in installation and use.

The invention discloses a device and a method for shaping a Gaussian beam to a flat-topped beam. The device mainly comprises four parts, which are a variable focus beam expanding mirror group, an aspherical mirror group, an inverted fixed focus beam expanding mirror group and an upright fixed focus beam expanding mirror group sequentially. At the front end, the variable focus beam expanding mirror group is adopted for firstly performing beam expanding matching on the input Gaussian beam with arbitrary waist radius and the further inputting into the aspherical mirror group, thereby getting the flat-topped beam which is only applicable to near-field propagation. In order to get the flat-topped beam which has better beam quality and can be applicable to far-field propagation, the inverted fixed focus beam expanding mirror group is further used for performing beam expanding, beam reducing is further performed after far-field propagation for a certain distance, and then the flat-topped beam with good uniformity in light intensity distribution is obtained at the output end of a system. The device is very high in flexibility and good in controllability, and can perform the beam expanding on the Gaussian beam with the arbitrary waist radius, and simultaneously overcome the problem that the beam quality of the flat-topped beam which directly goes out of the aspherical mirror group becomes poor.

The invention provides a semiconductor laser optical shaping method and device. High-power uniform light spots can be obtained, and cost is low. The principle includes that firstly, beams emitted by semiconductor laser stacks are collimated and then exponentially expanded, laser beams with energy in Gaussian distribution are transformed into flat-top beams with uniform energy density distribution, and secondly, expanded laser is focused by a focusing system, so that uniformity of the light spots can be achieved and improved.

The invention discloses a system and method for preparing a micro-nano array structure by means of laser light. The method for preparing the micro-nano array structure by means of laser light comprises the steps that a first laser beam with the wavelength enabling a material to be processed to generate the multiphoton absorption effect is provided; homogenization treatment is conducted on the first laser beam in Gaussian distribution, so that a first flat beam with energy evenly distributed is obtained; the first flat beam is split into multiple laser beams arranged in an array mode by means of a microlens array component; the multiple laser beams arranged in the array mode are focused to beam focusing components located on the same plane respectively; a metal ion solution placed on a minitype movable table controlled by a computer is scanned, so that hundreds of micro-nano periodical array structures are obtained, wherein the beam spot area of the first flat beam is equal to or smaller than the effective array area of the microlens array component. According to the method for preparing the micro-nano array structure by means of laser light, the micro-nano array structures of the same structure and in controllable dimensions can be prepared in a large-scale mode rapidly.

The invention discloses a method used for realizing beam collimation and uniformity, and the method comprises the following steps: the first surface of an optical element receives an input and divergent Gaussian beam, and diverges the beam, wherein the first surface has a spherical surface or an aspheric surface; and the second surface of the optical element resets the phase of the beam diverged by the first surface, and obtains a collimated and uniformly distributed flat top beam, wherein the second surface has an aspheric surface. The invention also discloses an optical element which adopts the least optical devices to finish the uniformity and the collimation of the diverged Gaussian beam, thereby avoiding the complex debug of the optical devices, and saving the use cost and the manufacturing cost.

The invention provides a laser shaping device. The laser shaping device comprises a laser emitter, a beam expanding lens, a spatial filter, a shaping lens and a focus lens; the spatial filter is arranged on an optical path of laser beams and arranged between the laser emitter and the focus lens; the shaping lens is arranged on the optical path of the laser beams and arranged between the spatial filter and the focus lens; the laser beams pass through the shaping lens and accordingly gauss beams emitted from the laser emitter are converted into flat-topped beams. According to the laser shaping device, the laser beams are converted into the flat-topped beams which are uniform in energy density distribution through the beam shaping lens, the energy distribution of the laser beams is the gauss distribution, and accordingly the shaped flat-topped beams can obtain good slit cutting effect and efficiency in comparison with the beams which are in gauss distribution, the slit edge can be smooth without burr, heat effect or taper and the like, and the application in the micro manufacture filed of a laser shaping cutting slit is expanded.

The embodiment of the invention discloses a method for realizing light beam homogenization. The method comprises the following steps that: a first aspherical surface of an optical device receives input nonhomogeneous light beams, and diverges or focuses the light beams; a second aspherical surface of the optical device outputs flat-top beams collimated to be in uniform distribution by changing the phase of the beams diverged or focused by the first aspherical surface; the bending direction of the second aspherical surface is consistent with that of the first aspherical surface. The embodiment of the invention also discloses an optical device. The method can accomplish the homogenization of nonhomogeneous light beams by adopting the least optical devices, which avoids the complex debugging for a plurality of the optical devices and saves use cost as well as manufacturing cost at the same time.

The invention discloses a laser eutectic soldering device and method. A substrate which needs eutectic soldering is placed on a base station, and the place for holding the eutectic soldering substrate is hollowed; a suction nozzle picks eutectic soldering flux and a chip which needs eutectic soldering and places on the substrate by the aid of a vacuum generator and an air pipe thereof, and a certain pressure is exerted to the eutectic soldering chip when performing eutectic soldering; light beams emitted from a laser emit to a light beam shaping system, and Gaussian distribution laser beams are shaped into flat-top beams; a concave lens and a convex lens fitly expand and collimate the laser beams, and then the laser beams are emitted to a laser focusing mirror; an obliquely arranged beam combiner reflects the laser emitted from the laser to enable the laser to irradiate the substrate which needs eutectic soldering; laser emitted from a laser thermodetector passes through the beam combiner to irradiate the substrate which needs eutectic soldering to monitor the temperature of the substrate and feed back to the laser in real time, and the energy of the laser emitted from the laser is controlled in real time to realize a precise temperature curve.

The invention relates to the field of non-image optics, in particular to a method for shaping a gauss beam into a flat-topped beam, aims to solve the problems that the global algorithm takes much time and the initial phase setting of the local algorithm has great impact on a result, and provides the method for shaping the gauss beam into the flat-topped beam. The method comprises the following steps: (1) determining the diameter D1 of the gauss beam, the diameter D2 of the flat-topped beam and the distance L between two optical elements (including a shaping element and a phase correction element); (2) according to the energy conservation, calculating the light intensity of the flat-topped beam; (3) according to ray tracing, building an one to one correspondence relationship; (4) calculating the declination angle of a light ray; (5) determining the initial phase distribution of the shaping element; (6) determining the initial phase distribution of the phase correction element; (7) conducting optimizing calculation on the phase distribution according to the local algorithm. The method is applicable to the field of non-imaging optics.

A method, system and scan lens for use therein are provided for high-speed, laser-based, precise laser trimming at least one electrical element along a trim path. The method includes generating a pulsed laser output with a laser, the output having one or more laser pulses at a repetition rate. A fast rise / fall time, pulse-shaped q-switched laser or an ultra-fast laser may be used. Beam shaping optics may be used to generate a flat-top beam profile. Each laser pulse has a pulse energy, a laser wavelength within a range of laser wavelengths, and a pulse duration. The wavelength is short enough to produce desired short-wavelength benefits of small spot size, tight tolerance, high absorption and reduced or eliminated heat-affected zone (HAZ) along the trim path, but not so short so as to cause microcracking. In this way, resistance drift after the trimming process is reduced.

The invention discloses a flat-top light beam shaping control method for achieving an abrupt edge and low light-intensity variation and a shaping device thereof, and the flat-top light beam shaping control method and the shaping device relate to a flat-top light beam shaping device for achieving the abrupt edge and the low light-intensity variation, and further relate to a shaping control method, so as to solve the problems in the prior art that a position cannot be flexibly set to shape a light beam, the shape and the caliber of the shaped light beam cannot be changed flexibly, the edge is not abrupt, and further, the flat top light-intensity variation of the light beam is large. A lens in the shaping device provided by the invention is positioned between a surface where an optical phase array is positioned and an output surface; the light beam passes through the optical phase array, and then goes through a Fourier transform lens, so that the light beam is shaped; a light field is obtained at the output surface; and an intensity distribution collecting module collects the intensity distribution of the light beam of the shaped light field of the output surface and outputs the intensity distribution of the light beam to a processor module, and judges whether to adjust the phase of the optical phase array or not through calculating an RMSE (root-mean-square error ) value. By using the device provided by the invention, the anticipative shaping of the light beam is achieved by the shaping control method. The flat-top light beam shaping control method and the shaping device are applied to the technical field of diffraction optics and laser shaping.

The invention provides a diffraction optical element shaping Gaussian beam into a one-dimensional flattened beam or a rectangular flattened beam. The diffraction optical element is called DOE for short. A manufacturing method of the DOE is also provided. Grooves or steps which are in different shapes and have different sizes are manufactured at the center of a quartz substrate, the DOE is arranged at different positions in a light path, the DOE is matched with a beam expanding collimating mirror and a focusing lens, and then the one-dimensional flattened beam or the rectangular flattened beam is formed. The DOE has the following prominent advantages of being high in energy transmittance rate, insensitive to the change of a lasing mode and easy and flexible to install and use.

The invention relates to a special-shaped hole processing method based on spatially shaped femtosecond laser layered scanning, and belongs to the technical field of femtosecond laser applications. According to the processing system, a space shaping technology is adopted to shape traditional femtosecond laser with Gaussian distribution in a space into a flat-top light beam with uniform energy distribution after focusing, a laser scanning path and parameters are set, and high-quality complex special-shaped hole processing is realized. When the spatially shaped femtosecond laser is applied to scanning of a special-shaped hole, energy distribution of the shaped flat-top light beam is relatively average, so that non-ideal processing results caused by uneven ablation can be effectively avoided.When the spatially shaped femtosecond laser is applied to scanning of the special-shaped hole, the shape, the size, the depth and the taper of the special-shaped hole can be conveniently adjusted through the layered design of the scanning path, and special-shaped hole processing with a high freedom degree is realized.

The invention relates to a single aspheric lens for laser Gaussian beam shaping and belongs to the technical field of laser beam shaping. The single aspheric lens successively comprises a lens front surface and a lens rear surface in the beam incident direction. The lens front surface is an aspheric surface, the lens rear surface is a plane, and a lens side surface is a cylindrical surface. The lens front surface protrudes towards the beam output direction. The material of the lens is SK2 optical glass. The single aspheric lens is used for shaping a red light beam with light intensity distribution of I(y) = I0exp (-2y<2> / y0<0>) and a Gaussian spot radius of y0 = 30mm, wherein I0 is central light intensity and is an arbitrary constant value. An outgoing beam is a flat-topped beam with and a spot radius of 36mm.

The invention relates to an anti-damage laser cleaning device. The anti-damage laser cleaning device comprises a laser device, a light beam shaping system, a scanning galvanometer system, a focusing system and a control system. A laser beam emitted by the laser device sequentially passes through the light beam shaping system, the scanning galvanometer system and the focusing system and is focused on the surface of a to-be-cleaned workpiece. The control system controls the laser device and the scanning galvanometer system to dynamically adjust the focal position of the laser beam in real time so that the cleaning work can be completed. The light beam shaping system is used for shaping an incident gauss beam into a flat-top light beam firstly and then conducting beam uniformizing conversion so that the edges of lasers can be sharper and the light intensity can be more uniform, and the surface of an object can be cleaned through the laser beam subjected to conversion without being damaged. The lasers reflected by the surface of the workpiece can be isolated through a polarization detection unit, and it is avoided that the reflected lasers damage optical devices.

A double-sided microlens array is applied to a laser beam shaping and homogenizing device of a laser system. The double-sided microlens array is able to shape the energy distribution of an incident laser beam to a square and flat-top beam with the average uniformity of energy and comprises a base plate, a plurality of first micro lenslets and a plurality of second micro lenslets. The first micro lenslet and the second micro lenslet have the convexes with the same figures and comply with the classification of an optical diffractive element, the first micro lenslets and the second micro lenslets are disposed on the first surface and the second surface of the base plate, which are corresponding to each other in order to tightly line up the arrangements of arrays. The first micro lenslets and the second micro lenslets are correspondingly misalignment.

The invention discloses a method for designing a single aspheric surface shaping lens for converting a Gaussian beam into a flat-topped beam, namely a particle swarm optimization algorithm. Theoretical values of coordinates of an intersection of emergent light of the shaping lens and an output plane are obtained according to energy conservation before and after beam conversion, the theoretical values serve as target values, and actual values of the coordinates of the intersection of the emergent light of the shaping lens and the output plane are obtained according to the refraction law. Absolute values of differences of the actual values and the target values of plenty of light form evaluation functions of a beam shaping system, the evaluation functions serve as fitness functions in the particle swarm optimization algorithm, and structure parameters of the shaping lens are connected with the fitness functions in the particle swarm algorithm; the method for designing the beam shaping system through the particle swarm algorithm is provided, the design method is implemented through programming, and the design of the shaping system is procedural and intelligent. The invention further discloses a single aspheric lens for laser beam shaping based on the method.

The invention relates to a laser frequency stabilization and power stabilization optical path system for an SERF atomic gyroscope. The system comprises two parts: a saturated absorption frequency stabilization system, and a liquid crystal laser power stabilization and beam shaping system. The saturated absorption frequency stabilization system is used for performing frequency stabilization on pumping light of the SERF atomic gyroscope, and a liquid crystal laser power stabilization system is used for performing power stabilization on the pumping light of the SERF atomic gyroscope, wherein a flat top beam shaping module is used for shaking a laser spot, so that the laser spot changes from laser with Gaussian distribution energy into flat top laser with uniform energy distribution. The laserfrequency stabilization and power stabilization optical path system provided by the invention is reasonable in optical path layout, compact in structure, convenient to install and adjust, and simplein experimental operations, and provides a basis for the development of a high-precision miniaturized SERF atomic gyroscope.

The invented method includes the following steps: making focal point of first lens be fallen in first oscillating cell, making the light transmitted by first lens produce first SBS in the focal point position of first lens, utilizing second lens to transfer the transmission light outputted from first oscillating cell and making it produce second SBS in the focal point position of second lens, also making focal point of second lens be fallen in second oscillating cell, so that the light outputted from second oscillating cell is flat-top beam.

The invention provides a method for obtaining time domain flat top beams by using one-time stimulated brillouin scattering light limiting, which relates to the field of nonlinear optics. The method solves the problems that the prior non-linear limiting mechanism can not be applied to protection of a high-power laser system, the device used in the prior method for obtaining flat top beams is complicated, and large output energy from the stimulated brillouin scattering light limiting is lost. The method provided by the invention is that s polarized pump light is input to the system; the light is transmitted to a lens (5) after passing through a 1 / 2 wave plate (2), a Polaroid (3), and a 1 / 4 wave plate (4); the light is focused on an oscillating pond (6), and shows the stimulated brillouin scattering effect with a brillouin medium in the oscillating pond (6); the transmitted light resulting from the scattering effect is the time domain flat top beam output from the system; and the phonon lifetime of the brillouin medium ranges from 0ns to 0.3ns. The method for obtaining time domain flat top beams by using one-time stimulated brillouin scattering light limiting has the advantages of simple devices used, wide application scope of wavelengths, high efficiency, etc.

The invention relates to a line width adjustable laser cutting method and laser cutting device used for cutting a terminal short circuit ring. The line width adjustable laser cutting method comprisesthe following steps of shaping a laser beam into a flat-top beam; adjusting the spot size of the flat-top beam; and reducing and ejecting the spot of the adjusted flat-top beam according to a preset ratio to cut the terminal short circuit ring. By shaping the laser beam into the flat-top beam, the flat-top beam has uniform energy distribution so that consistent acting effect of the whole laser acting area can be guaranteed, the middle part and the two sides of a cutting way can be both completely removed, metal black point residue at the cutting edge is avoided, and the short circuit risk is prevented. In addition, when small-dimension cutting is converted into large-dimension cutting, the spot is enlarged to increase the laser cutting width only by adjusting the spot size of the flat-topbeam; the cutting of the large-size terminal short circuit ring is finished in one time, accumulated multi-cutting mode does not need to be adopted, and the cutting processing efficiency is greatly enhanced.

Methods, systems, and apparatus for Near Infrared Microbial Elimination laser Systems (NIMELS) are disclosed that can apply near infrared radiant energy of certain wavelengths and dosimetries capable of impairing biological contaminants, for example fungus, without intolerable risks and / or adverse effects to biological moieties other than a targeted biological contaminant. Lasers including diode lasers may be used as one or more light sources. A delivery assembly can be used to deliver the optical radiation produced by the source(s) produced to an application region that can include patient tissue. A flat top lens can be included to produce a flat top beam distribution. Exemplary embodiments utilize laser light in a near infrared range of 850 nm-900 nm and / or 905 nm-945 nm at suitable NIMELS dosimetries. For certain applications, laser light in two spectral ranges including 870 nm and 930 nm, respectively, can be utilized.

An embodiment of the invention discloses a diffractive optical element and a system for generating a focused flat-topped light spot beam. The diffractive optical element is used for generating the focused flat-topped light spot through diffraction and focusing of a focusing mirror when Gaussian light is incident, and comprises a Gaussian light receiving module and a phase modulation module, wherein the Gaussian light receiving module is used for receiving the Gaussian light; the phase modulation module is used for carrying out binarization phase modulation of sinc function beam splitting on the Gaussian light, the modulation phase of a modulation area of the phase modulation module is pi, and the modulation phase of a non-modulation area of the phase modulation module is 0; and the modulation area comprises a rectangle with the side length a and b and a square with the side length b, a is equal to 2w, b is equal to w, and w is the size of an incident light spot. The novel diffractive optical element is adopted for shaping, the size of the flat-topped focusing light spot is more accurately controlled, Gaussian beam incidence generates different phase differences through phase modulation of the diffractive optical element, and therefore an ideal flat-topped beam is obtained in a focusing plane.

The invention discloses a side pump signal beam combiner for realizing flat-topped beams and a preparation method thereof, and belongs to the technical field of laser beam shaping. The main signal optical fiber has at least two layers of waveguide structures; the refractive index of the inner-layer waveguide structure is higher than that of the outer-layer waveguide structure; the main signal optical fiber is a multimode optical fiber for laser with a transmission wavelength, the side arm input optical fiber is subjected to fused biconical taper processing to be attached to the interior of a waveguide structure outside the innermost layer waveguide structure of the main signal optical fiber, and the fusion length L of the side arm input optical fiber is 0 mm (L is smaller than or equal to200 mm; the fusion depth H is 0 [mu] m (H is less than or equal to 500 [mu] m; the diameter D of the fusion area is larger than or equal to 5 micrometers and smaller than or equal to 500 micrometers,the optical waveguide mode that signal light in the side arm input optical fiber enters the main signal optical fiber is changed by controlling the tapering fusion length, diameter and depth of the side arm input optical fiber, and therefore output of flat-topped mode light spots is achieved in the main signal optical fiber.

The invention relates to a novel flat-topped beam generating device, and belongs to the field of laser transmission and control. According to the novel flat-topped light beam generating device of the invention, a flat-topped beam shaping technical approach of combining a liquid crystal spatial light modulator and an aspherical lens group is adopted; the properties of high resolution and high modulation precision of the liquid crystal spatial light modulator are fully utilized, and the uniformity of a output flat-topped beam can be obviously improved through a closed-loop modulation method; moreover, the device has a light intensity uniformity automatic compensation function; in a laser transmission link, the device can carry out automatic compensation and correction for flat-topped light beam uniformity reduction caused by environmental pollution, optical element degradation, light imbalance of an optical structure and the like, so that the device is lower in working environment requirement, longer in service life and higher in quality reliability; in addition, the device can generate laser spots with different light intensity distributions in a modulation range according to needs, can be expanded and applied to other research fields, and is wider in application range.

A focal plane array light detection and ranging 3D imaging method based on a code division multiple access technique is provided. A narrow laser pulse is shaped into a flat-top beam. The shaped beam is space-time encoded by a focal plane array-based optical encoder. The encoded beam is projected onto the target. The echo signals are obtained by a collecting lens. According to the encoding rule, the signals are grouped and multiplexed into several channels; subsequently, the multi-channel multiplexed signals are captured by a focal plane array detector and converted by a multi-channel digitizer. The multi-channel encoded full waveform signals are acquired from the digitizer by a PC terminal. The encoded full waveforms can be demodulated into the flight ranges for all subpixels via signal processing. By orthogonal range correction and pixel splicing and integrating the geographical data of all pixels, the 3D image reconstruction of the target can be accomplished.

The invention relates to a laser device for outputting flattened beams. The laser device comprises a reflection cavity mirror, a gain medium, a polarizing film, a phase adjustment mirror, a compensating lens and a Porro prism. The laser device utilizes a cavity to place the phase adjustment mirror, and the phase delay of endovascular laser is modulated radially through the polarizing film, the phase adjustment mirror and the Porro prism, so that the radial variation of coupling output rate of the polarizing film is realized, and the laser emergent through the polarizing film is a flattened beam with a flat middle part. Meanwhile, the compensating lens is adopted to eliminate the lens effect caused by inserting the phase adjustment mirror into the laser cavity. The laser device is simple in structure, less in loss, high in efficiency, and high in filling factors of the outputted beams.

A portable variable-focus-length optical system includes a laser generator, a variable-power beam expanding mechanism, a flat-topped beam shaping mechanism and a Bessel beam shaping mechanism. The variable-power beam expanding mechanism, the flat-topped beam shaping mechanism and the Bessel beam shaping mechanism are arranged in sequence along the beam direction of the laser generator. According to the portable variable-focus-length optical system of the invention, the length of the laser focus can be changed by setting the laser generator, the variable-power beam expanding mechanism, the flat-topped beam shaping mechanism and the Bessel beam shaping mechanism. A suitable focus length can be selected according to factors such as the laser power and the thickness of a cutting sample. The beam focusing energy can be homogenized by the flat-topped beam shaping mechanism, so that laser can converge into a needle type processing line with uniform energy, a transparent material can be cut atthe first attempt, and the cutting efficiency is improved. The portable variable-focus-length optical system has the characteristics of being compact in structure, convenient to package and carry, and highly flexible.

The embodiment of the invention provides a light beam shaping method, device and system, a storage medium and an electronic device.The method comprises the steps that a holographic image of a target shape is acquired, wherein the holographic image is used for indicating light wave information of a to-be-shaped light beam; wavefront reproduction processing is conducted on the holographic image, a flat-topped light beam corresponding to the light beam to be shaped is obtained, and the light spot shape of the flat-topped light beam is the target shape; multiplying power zooming is conducted on the light spot size of the flat-topped light beam, a target light beam with the light spot size being the target size is obtained, and the light beam energy of the target light beam is equal to the light beam energy of the light beam to be shaped. According to the invention, the problem of large light beam energy loss in the light beam shaping process in the prior art is solved, and the effect of reducing the light beam energy loss in the light beam shaping process is further achieved.