61 results about "Gaussian laser beam" patented technology

The invention relates to the field of laser application, and in particular relates to a Gauss laser beam shaping method and a Gauss laser beam shaping device and a precise laser micropore processing device. A beam expanding device, a shaping device, an initial focusing lens, a hole diaphragm, a collimation device, a light beam deflection device and a focusing lens are sequentially arranged along the light path, wherein the Gauss laser beam is shaped as a flat laser beam by the shaping device after being expanded through the beam expanding device, the flat laser beam is collimated by the collimation device after being intercepted by the hole diaphragm and initially focused by the initial focusing lens, a transmission direction of the flat laser beam is changed through the light beam deflection device, and then the flat laser beam is focused through the focusing lens to obtain the laser beam for micropore processing. The Gauss laser beam is output after being shaped as the flat laser beam, the utilization rate and the processing efficiency of the laser are improved, and the energy loss is reduced; meanwhile, when the flat laser beam obtained through the focusing of the focusing lens is used for micropore processing, the hole margin of each of a through hole and a blind hole is smooth, the taper of the hole is reduced, the bottom damage of the blind hole is avoided, and the blind hole with a flat bottom is obtained.

The invention discloses a scanning three-dimensional imaging laser radar based on a linear array APD detector and an imaging method. The laser radar shapes the circular Gaussian laser beams into stripe laser to be transmitted, the linear array APD detector receives the laser echo, and the receiving field of view of the linear array APD detector coincides with the far-field facula of the laser. The range data are finally obtained after the signals output by the detector are amplified and processed. The laser radar completes measurement of the whole field of view via a two-dimensional scanning mechanism. The invention greatly improves the detection efficiency without increasing the repetition frequency of the laser and can meet the application requirement for demanding imaging time.

A method and apparatus for converting a Gaussian laser beam into a propagating far field diffraction pattern using an off-axis diffractive optic. This propagating far field pattern is focused by a lens to obtain a flattop intensity at the focal plane. The technique is based on the idea of Fourier transform pairs and produces a small spot diameter with a useable depth of field. A focused uniform intensity profile can be useful for many laser applications.

A method of manufacturing an optical waveguide using a laser direct writing method is disclosed. More particularly, a method for improving refractive index profile of the optical waveguide by overlapping two or more beams using Gaussian laser beam is provided. In addition, it can accomplish an improved waveguide characteristics such as an offset structure of an S-bend type optical waveguide and an asymmetrical curve optical waveguide by individually adjusting the overlapped laser beams.

A uniform light spot surface scanning device of a laser cleaning machine comprises a laser output module (10), a gauss-flat top system, a gradually-changing rotating polygonal mirror (50), a drive motor (60) and a collimation focusing lens (70). The gauss-flat top system redistributes the energy of a gaussian laser beam emitted by the laser output module (10) and compresses the diameter of the laser beam at the same time, so that a laser beam with uniform energy is formed; the laser beam irradiates the gradually-changing rotating polygonal mirror (50); the gradually-changing rotating polygonal mirror (50) is driven by the drive motor (60) to rotate so as to make the laser beam form a space angle scanning beam; the space angle scanning beam is refracted by the collimation focusing lens (70) and then forms surface light spots on an object (80) to be cleaned.

The invention provides an operating method of an FSO (Free Space Optical) communication system based on an IHDAF (Incremental Hybrid Decode-Amplify-Forward) protocol, and belongs to the technical field of wireless optical communication. The FSO communication system includes a source node, a relay node and a target node and utilizes a half-duplex operating mode. The operating method of an FSO communication system based on an IHDAF protocol includes three steps: performing M-order pulse amplitude modulation on the source information; transmitting the modulated information to the relay node and the target node through a gauss laser beam, comparing the link instantaneous signal to noise ratio gamma sd from the source node to the target node and the link instantaneous signal to noise ratio gamma sr from the source node to the relay node with the signal to noise ratio threshold SNRsd and SNRsr set by the corresponding link so as to determine selecting the corresponding transmission scheme, that is, direct transmission, Decode and Forward, and Amplify and Forward; and at last, performing recovery and demodulation on the reception signal by means of the target node. The operating method of an FSO communication system based on an IHDAF protocol integrates the relay technology with the free space optical communication technology in the protocol so as to effectively restrain reduction of system performance, caused by path loss, atmospheric disturbance and aiming error and improve the transmission reliability of system.

The invention discloses a method for processing a micropore of a patch clamp chip. The method comprises the following steps of: 1) expanding an ultraviolet Gaussian laser beam which is emitted by an ultraviolet laser and has the power of 1 to 7W by using a beam expander; 2) taking a central light spot of the ultraviolet Gaussian laser beam with an aperture of 1.2 to 1.8 millimeters out through an adjusting diaphragm from the ultraviolet Gaussian laser beam expanded by the beam expander; and 3) focusing the central light spot of the ultraviolet Gaussian laser beam to the surface of the glass patch clamp chip for perforation, and during perforation, forming a funnel-shaped micropore on the glass patch clamp chip by controlling a central diameter of the adjusting diaphragm in the step 2). By the method, the high energy of the focused ultraviolet laser can break a molecular structure of a glass material on a patch clamp chip clamp within an extreme time, and uniform pores can be formed on the glass material.

A method for patterning polycrystalline indium tin oxide by using a Gaussian laser beam focused on an amorphous indium tin oxide layer is disclosed to pattern the non-crystalline amorphous indium tin oxide layer and transfer part of the amorphous indium tin oxide layer into polycrystalline indium tin oxide while the remaining amorphous indium tin oxide layer is etched due to etching selectivity of an etching solution. The method comprises: providing a substrate with an amorphous indium tin oxide layer thereon on a carrier; transferring the amorphous indium tin oxide layer in a predetermined area into a polycrystalline indium tin oxide layer by emitting a Gaussian laser beam focused on the amorphous indium tin oxide layer in the predetermined area; and removing the remaining amorphous indium tin oxide layer on the substrate by an etching solution to form a patterned polycrystalline indium tin oxide layer.

The invention relates to the field of laser application, in particular to a precision laser cutting and micro-hole machining device. The precision laser cutting and micro-hole machining device comprises a laser as well as a beam expansion device, a front-end reflective mirror, a rear-end reflective mirror and a focusing lens which are arranged in sequence along a light path, wherein at least one beam shaping system used for shaping Gaussian laser beams into flat-top laser beams and at least one beam optimization system used for optimizing the Gaussian laser beams are arranged between the front-end reflective mirror and the rear-end reflective mirror; the front-end reflective mirror is used for reflecting the Gaussian laser beams passing through the beam expansion device into the beam shaping system or the beam optimization system; the rear-end reflective mirror is used for reflecting laser beams emitted by the beam shaping system or the beam optimization system into the focusing lens. Only by switching the beam shaping system or the beam optimization system for production and machining, switching between micro-hole machining and cutting machining can be realized, so that the operation is simple and the production efficiency is high; with the adoption of the beam shaping system, the micro-hole machining quality can be effectively improved while the laser utilization rate is increased and the laser machining efficiency is improved.

The invention discloses a method of simulating generating of large depth field programmable grating. A laser is used to emit a laser beam, and after focusing and collimating of a collimating lens, a collimating Gaussian laser beam capable of satisfying requirements is acquired. After primary specular reflection, the laser beam passes through a circular diaphragm, and is emitted into an MEMS vibration mirror. The laser beam is reflected to a surface of a measured object by the MEMS vibration mirror. Under control of a sinusoidal current signal generated by a driving board, the laser is used for the sinusoidal modulation of the brightness of the laser beam. Under excitation of a driving signal generated by the driving board, the MEMS vibration mirror is used for two-dimensional rotation, and therefore the laser beam is driven to carry out scanning, and grating images are generated. The cycle and the phase of the driving signal of the laser are changed to acquire the grating images of different cycles and different phases. The grating generated by adopting the above mentioned technical scheme has a programmable advantage of a digital grating and a high resolution advantage of a physical grating. The field depth of the generated grating is extended by more than ten times, and therefore a measuring range is greatly improved.

The invention discloses an experimental device based on a threshold value of an atmospheric parameter optimization space laser communication system. The experimental device comprises a sending terminal and a receiving terminal; a modulation signal source of the sending terminal outputs a coded signal to control a semiconductor laser to send a Gaussian laser beam; the Gaussian laser beam is fixed on a beam expander arranged on an optical bench through optical fiber input and enters atmospheric turbulence after collimation and beam expanding, is received by a Cassegrain telescope at the receiving terminal after being transmitted for a distance in the atmospheric turbulence, and enters coupled optical fibers of a photoelectric detector after focusing; and a voltage signal output by the photoelectric detector is transmitted to a computer, and the computer processes collected data according to a calculation program and outputs the optimal fixed threshold value UST and bit error ration (BER) of the space laser communication system under the current condition. The device has no special requirements for optical elements, and is simple in structure, convenient to operate and good in optimization effect; and simultaneously, the calculation method for determining the threshold value is good in optimization effect and simple to implement.

An optical fiber for converting a Gaussian laser beam into a Bessel laser beam may include a first segment optically coupled to a second segment with a transition region, the first segment having a first outer diameter greater than a second outer diameter of the second segment. The first segment may include a first core portion with a first cladding portion extending around the first core portion. The second segment may include a second core portion with a second cladding portion extending around the second core portion. The optical fiber may have a non-axisymmetric refractive index profile or may be coupled to an end cap with a non-axisymmetric refractive index profile.

The invention relates to a nanosecond solid-state laser modulation system and a bonded wafer separating method. The method is characterized by comprising the following steps: (1) placing bonded wafers on a bearing platform; (2) emitting, by a laser generator, Gaussian laser beams, and modulating the Gaussian laser beams via a beam shaping mirror to generate square light spots; focusing the laser beams of the square light spots to penetrate through a glass slide and arrive at a release layer, ashing the releaser layer, and ensuring a bonding layer not damaged; (3) adjusting the relative positions of the laser generator and the bearing platform, so that the moved positions of the square light spots irradiated onto the bonded wafers are ashed, and the light spots after and before moving are partially superposed; sequentially moving the light spots to realize laser irradiation of the whole surface of the bonded wafers; and (4) after laser irradiation and ashing in the above steps, taking the glass slide down. According to the method, the release layer in the temporary bond is ashed by laser, so that batch production can be realized, yield loss is eliminated, and the output efficiency is greatly improved at the same time.

The invention discloses a laser speckle-removing optical path which can performs uniform shaping on a Gaussian laser beam by successively arranging a first taper mirror, a diffuser and a second taper mirror in a laser output optical path. In combination with the diffusion effect of the diffuser, the diversity of laser beam divergence angles is formed. The second taper mirror is used for collecting the divergent laser beam so as to ultimately form a light beam uniform distribution way of respective divergence angles near a 0-degree optical axis. The diversity of laser beam divergence angles may reduce the spatial coherence of the laser. Further, the uniform distribution of 0 degree and each divergence angle can prevent a case that the energy of a large-angle divergent beam is over high and thus causes light loss when the divergent beam enters a light collecting part, thereby being beneficial to improvement in the brightness of a laser light source. The technical scheme can take account of the laser speckle removing and the brightness enhancement of the laser light source. The present invention is applied to the technical field of laser display.

The invention provides a 532nm semi-Gaussian laser beam generator, comprising a pump light source, an alignment system, a cylindrical lens, an optical superlattice, a temperature control furnace and a filtering system, wherein the optical superlattice which is modulated in a side direction and polarized periodically is LiTaO3 and 7.505mu m in period, and used for converting 1064nm laser frequency into 532nm laser frequency; the polarization scope edges of the superlattice are distributed in an e-exponential mode in the light transmission direction of a crystal; 1064nm Gaussian laser emitted by the pump light source enters into the alignment system and then is focused in the optical superlattice by the cylindrical lens; the scope edges of the superlattice pass through the center of the Gaussian laser beam which enters into the pump light source; a high reflective mirror of 1064nm laser and the filtering system constructed by interference filters are utilized to filter out 1064nm pump lights in outgoing beams on an outgoing optical path of the superlattice so as to obtain 532nm semi-Gaussian laser. The generator is compact in structure and small in volume.

The invention discloses a laser energy transmission photoelectric conversion efficiency improvement method and can reduce mismatch loss caused by nonuniform power density distribution of Gauss laser beams and improve laser energy transmission photoelectric conversion efficiency. According to the method, a circuit optimization photocell array is designed, a photocell array substrate employs a one-side tin-spraying universal plate, so the photocells can respectively realize series and parallel connection according to optimization requirements, and the photocells respectively employ monocrystalline silicon cells and are used for converting laser energy into electric energy. Compared with a photocell array in the prior art, the photocell array is arranged in an annular mode, the cells are connected according to the optimization circuit to make received laser irradiation power densities be generally identical, output currents of the cells are made to be similar, mismatch loss is reduced, and photoelectric conversion efficiency is improved. The method is advantaged in that simple structure, easy realization and strong practicality are realized, and photoelectric conversion efficiency during laser energy transmission is improved.

The invention relates to a battery module. The battery module comprises welding parts which are formed because electrode terminals extend upward and comprise welding faces in the direction perpendicular to the battery module. Spot laser welding is performed on the welding parts with top-hat laser beams or Gaussian laser beams in a lap welding manner. The battery module also comprises swelling partitions. Therefore, on the condition of swelling which causes volume increase because of the internal problem of battery units, the swelling positions can be adjusted for causing short circuit of the electrode terminals, so that the electric connection can be broken and the stability of the battery units can be improved.

The invention provides a beam shaping based hidden added material type laser butt welding method. The method comprises the steps that (1) workpieces are clamped, a welding added material is embedded to the portion of a butt welding joint of the two to-be-welded plate workpieces, the relative directions of a laser welding joint and the workpieces are set, a dual circular ring composite shaping beamoutput by the laser welding joint is vertically incident to the portion of the butt welding joint of the workpieces and is focused to the surface; and (2) lasers are started to output the dual circular ring composite shaping beam, the dual circular ring composite shaping beam is controlled to advance in the welding seam direction, the welding seam area is subjected to overlapping scanning three times successively through an outer circular ring Bessel laser beam, an inner circle Gaussian laser beam and an outer circular ring Bessel laser beam, and finally a welding joint containing enriched added material metal is formed through solidification. According to the method, added materials of different materials and components can be selected for different kinds of plate base metal according tothe needs of application occasions, welding joints of various special properties can be achieved, a good welding seam structure can be obtained easily, and the welding joint property can be improved.

The invention discloses arbitrary wavelength semi-Gaussian laser beam generator, belonging to the laser beam shaping technology field. The arbitrary wavelength semi-Gaussian laser beam generator consists of an incident laser light source, a collimator system, a coherence degree attenuator, and a non-transparent sheet (blade). The laser beam shaping method comprises steps of transmitting parallel light which is converted by an incident laser light source through the collimator system to the coherence degree attenuator, and using the non-transparent sheet (blade ) to cut half of the light outputted from the coherence degree attenuator, wherein the outputted light beam is the semi-Gaussian laser beam which is transmitted stably in the space. The advantages of the invention are that only one coherence degree attenuator and the non-transparent sheet (blade) can realize the generation of the semi-Gaussian which can be stably transmitted in the free space, that the generator has no preference for the wavelength of the incident laser source, the light beam transmission is stable, the application range is wide and the laser beam generator is solid and the operation is easy.

The invention provides a light source system and laser projection display equipment, which are applied to the field of laser projection display. The light source system comprises an infrared laser light source and a nonlinear optical crystal array, the input end of the nonlinear optical crystal array is connected with the output end of the infrared laser light source, the nonlinear optical crystal array is used for performing frequency conversion on infrared laser generated by the infrared laser light source and then outputting the infrared laser, the infrared laser light source is a pump light source, and the nonlinear optical crystal array comprises at least one nonlinear optical crystal; each nonlinear crystal is used for outputting a single-mode Gaussian beam, the output end of the nonlinear optical crystal array outputs a coaxial visible Gaussian laser beam, and the coaxial visible Gaussian laser beam provides a light source for laser projection display. The light source system is simple in structure, small in size and low in power consumption. And the requirements of high beam quality, low power consumption, extremely simple packaging architecture and low-cost packaging process are fundamentally met.