30 results about "Femtosecond laser ablation" patented technology

The invention discloses a stretching organic electroluminescence device with a periodically regular crease structure, belongs to the technical field of photoelectrons, and particularly relates to the stretching organic electroluminescence device with a periodically regular crease, which is high in efficiency, high in stability and high in tensile strength. The stretching organic electroluminescence device is prepared by the following steps: processing a long-period grating structure on the surface of an elastic substrate by a femtosecond laser ablation process; obtaining an organic electroluminescence device by combining a vacuum evaporation technology and a demolding technology; and finally combining the elastic substrate with the long-period grating structure and the organic electroluminescence device. The stretching organic electroluminescence device has very high stretching stability; the photoelectric property of the device only slightly fluctuates along with the change of the tensile strength; and more importantly, the properties of the device only lightly attenuate in multiple repeated tensile tests, so that the stretching organic electroluminescence device has very high practical value.

The invention relates to a method of producing a micro- or nano-mechanical part, such as a pulley or belt for clock making, comprising a laser ablation step which is performed with the aid of a femto-laser, i.e. a laser having a pulse with a duration of less than 5x10<-13> seconds and a power of more than 10<12 >watts on the beam/material interaction surface. According to the invention, the part to be machined is pre-modelled in three dimensions and said three-dimensional model is used to generate the machining programme.

The invention relates to a preparation method of two-dimensional layered nano material MXene quantum dots. The method comprises the following steps: step 1, preparing a two-dimensional layered nano material MXene by adopting an etching process; step 2, dissolving the two-dimensional layered nano material MXene into deionized water or an organic solvent, and performing an ablation reaction under a femtosecond laser; and step 3, performing centrifugal separation on a solution obtained by ablation of the femtosecond laser to obtain a supernatant containing the two-dimensional layered nano material MXene quantum dots. The method provided by the invention utilizes the liquid phase femtosecond laser ablation process to prepare the two-dimensional layered nano material MXene quantum dots, is simple and safe to operate, has lower costs, uses a green solvent such as the deionized water to reduce pollution to the environment, has high reproducibility, is easy to operate, can be used for large-scale production, and can control particle sizes and particle size distribution of the two-dimensional layered nano material MXene quantum dots by controlling power of the femtosecond laser, thereby obtaining the MXene quantum dots with better photoelectric properties.

The invention relates to a method for preparing a micro-fluidic chip. A glass substrate sheet is ablated by a femto-second laser; during the machining process, a cleaning solution always carries out effective cleaning on a machining part inside the sheet; heat treatment is carried out on the glass substrate sheet that is machined by the femto-second laser; after the heat treatment, the diameter of a micro-fluidic passage and the dimension of a liquid bath in the sheet are reduced; the internal surfaces of the micro-fluidic passage and the liquid bath are smooth; a PDMS (Polydimethylsiloxane) sheet is selected as a connecting body; the position on the PDMS sheet corresponding to the longitudinal passage opening position of a micro-fluidic glass chip is bored; and subsequently the PDMS sheet is bonded with the micro-fluidic glass chip, thereby obtaining the micro-fluidic chip. The method has simple machining process and ensures that the laser can carry out continuously stable ablation on substration material; and the integrated micro-fluidic chip with complex and multi-layer structures can be prepared in the glass substrate. The prepared micro-fluidic chip has the characteristics of miniaturization and integration, has the functions of separation, reaction and detection, and can be widely applied to the analysis fields.

The invention provides a femtosecond laser ablation-based infrared-enhanced Si-PIN detector and a preparation method thereof. The detector comprises an intrinsic silicon substrate, a femtosecond laser ablation microstructure layer, an infrared-enhanced amorphous silicon-ruthenium alloy film, a lower electrode, a P-type region, an annular P+ type region and an upper electrode, wherein the femtosecond laser ablation microstructure layer is a micron sharp cone array. The unabsorbed light which transmits through a space charge region is reflected for multiple times; a light propagation path and the photo capture ratio are increased; absorption and utilization of the light are improved; more photo-induced carriers are excited; the responsivity of the detector is improved; a relatively narrow optical band gap is obtained through controlling the ruthenium content; and the band gap of a silicon material is narrowed, so that near-infrared light with lower energy and a larger wavelength is captured; absorption of the near-infrared light can be additionally increased; and the detection spectrum range of a photoelectric detector is expanded.

The invention provides a method for establishing a laser source model for femtosecond laser ablation simulation, which provides a laser source model with a focus moving down according to a spatial andtemporal distribution of the laser,. According to the method for establishing laser source model for femtosecond laser ablation simulation, the proposed laser source three-dimensional model can describe the situation in which the laser focus moves down with the material removal during the actual machining process, , it is ensured that the laser energy density above the material surface is realistic by dividing the expression into two segments at the machining plane position as shown in the description, and the energy density below the material surface (i.e., inside of the material) is reasonably attenuated. The proposed laser source three-dimensional model can also describe the spiral motion of the laser focus on the material plane during actual machining.

The invention discloses a preparation method of an optical fiber device integrated with a polymer micro-nano structure in an optical fiber. The preparation method comprises the following steps: carrying out fusion welding treatment on a hollow optical fiber, so that the hollow optical fiber is fused and welded between two solid optical fibers; carrying out ablation treatment on the hollow opticalfiber subjected to fusing and welding by utilizing a femtosecond laser ablation technology, so that a through slot vertical to the inner wall is ablated on the hollow optical fiber; then filling the interior of the hollow optical fiber with a colorless and transparent photoresist material, so that the interior of the hollow optical fiber is filled with the photoresist material; then carrying out polymerization processing on the photoresist material inside the hollow optical fiber by utilizing a femtosecond laser gemini polymerization technology, and finally cleaning the hollow optical fiber subjected to the polymerization processing with developing solution, so that a device with a polymer micro-nano structure inside is obtained. The device has the polymer micro-nano structure inside, thereby having functional characteristics of a polymer; and the device well combines material characteristics of the polymer with transmission characteristics of the optical fiber together, and the integration of a complex polymer functional microstructure and the optical fiber is realized.

The invention relates to a preparation of a chromium-doped zinc selenide nanoparticle saturable absorber and an all-fiber Q-switched laser formed by the same, belonging to the technical field of fiberlaser. The chromium-doped zinc selenide has a wide absorption band and a large absorption cross section in a 1.5-2.1 [mu]m wave band, has a high damage threshold and can be used as an excellent saturable absorber. The chromium-doped zinc selenide nano-particles prepared by a femtosecond laser ablation method are doped into polyvinyl alcohol or polymethyl methacrylate to prepare the film saturableabsorber. The invention also provides an annular cavity Q-switched laser adopting the saturable absorber. The annular cavity Q-switched laser comprises a wavelength division multiplexer, a gain optical fiber, an optical isolator, a polarization controller, a saturable absorber and an optical fiber coupler. The saturable absorber based on the nano particle film has the advantages of simple preparation process, low cost, easiness in integration and the like, and meanwhile, the constructed all-fiber structure laser has the advantages of compact structure, stable performance and the like, and issuitable for practical application.

The invention discloses a method for preparing a mark stamp based on femtosecond laser ablation composite induction. A titanium alloy TC4 or nickel-based alloy GH4169 metal sheet is adopted as a machining object, a light path is established, a femtosecond laser device outputs light to be focused to a shear type lifting table through a two-axis scanning galvanometer system, and the femtosecond laser device and the two-axis scanning galvanometer system are connected with a computer; the computer is utilized for adjusting the femtosecond laser device to output lasers, the wavelength of the lasersis 1,030 nm, the pulse width is 240 fs, the repetition frequency is 1-200 kHz and can be adjusted, and the maximum single pulse energy is 200 mu J; and the titanium alloy TC4 or nickel-based alloy GH4169 metal sheet is fixed to a machining station of the shear type lifting table, and through adjustment of the repetition frequency, the single pulse energy, the scanning speed and the groove distance, optimal laser ablation primary mark stamp basic parameters and laser induction second-time mark stamp basic parameters are obtained. By means of the method, the quality, efficiency and recognitionrate of the femtosecond laser mark stamp are improved, and adaptability is achieved for a titanium alloy and a nickel-based alloy.

The invention discloses a method for determining the laser defocusing amount in the femtosecond laser polishing process of an optical element, which belongs to the technical field of mechanical precision manufacturing engineering, and comprises the following steps of: outputting laser wavelength and focusing spot radius by using a femtosecond laser, and calculating Rayleigh length of a light beam;calculating the energy density when the laser reaches the surface of the material by utilizing the output pulse energy of the laser to focus the spot radius and the defocusing amount; calculating theablation depth of the surface of the energy material by using a femtosecond laser ablation rate mathematical model; solving the ablation depth of the femtosecond laser to the material under differentdefocusing amounts according to the laser ablation rate mathematical model; measuring the average value of the surface of the to-be-polished optical element, and determining the optimal polishing defocusing amount by substituting the height difference of the wave crest and the wave trough into calculation. The defocusing amount of femtosecond laser polishing can be rapidly, efficiently and accurately determined, the cost is low, the efficiency is high, and the accuracy is high.

The invention discloses a PEEK bone repair material and a surface modification method and application thereof. The surface modification method of the PEEK bone repair material comprises the followingsteps that femtosecond laser ablation is conducted on the surface of PEEK to be modified, and the surface-modified PEEK bone repair material is obtained; in the femtosecond laser ablation process, thelaser power is 40-160mW; and femtosecond laser ablation is plane scanning ablation conducted on the surface of PEEK to be modified. The PEEK bone repair material is in a micro-nano morphology, has excellent hydrophilicity and surface roughness and can promote cell adhesion, proliferation and cell differentiation.

The invention discloses a femtosecond laser ablation-surface coating combined machining method for a super-hydrophobic surface, and belongs to the technical field of photoelectricity. The method comprises the following steps: firstly, etching the surface of a substrate material sample by femtosecond pulse laser to obtain a material sample with a micro-nano array surface; and then coating a layer of low-energy-state hydrophobic film on the material sample with the micro-nano array surface to obtain the low-energy-state hydrophobic film-micro-nano array structure surface composite material, thereby realizing the comprehensive hydrophobic performance of physical hydrophobic and chemical hydrophobic. According to the method, the femtosecond laser etching technology and the low-energy-state hydrophobic film coating technology are combined, and the method has the advantages of being high in machining precision and stability, rapid and efficient in preparation and the like and can be widely applied to machining of micro-nano arrays on the surfaces of various compounds.

The invention relates to a femto-second laser device convenient for laser pulse width adjustment. The laser device comprises a pump laser diode, a condenser lens, a laser crystal, a chirped mirror, asemiconductor saturable absorber mirror, prisms and an end mirror which are sequentially disposed on the laser output path, wherein the prisms are a prism pair arranged on a motorized translation stage and can realize adjustment of the relative position, and a laser chamber of the femto-second laser device further comprises one chirped mirror for dispersion compensation and the prism pair. The invention further relates to the femto-second laser device for purposes of steel sample component detection or the laser eye surgery. The femto-second laser device is advantaged in that a light source with 200-1000 femto-second continuous change laser pulse width for the femto-second laser eye surgery can be realized, the laser pulse width changes along with the laser position in a cornea during femto-second laser ablation of the cornea, and the best laser ablation effect can be realized.

The invention relates to a titanium-nickel alloy material and a preparation method thereof, in particular to a titanium-nickel alloy material with high blood compatibility and a preparation method thereof. The material and the method solve the technical problems that at present, by applying a coating method, a coating is prone to fall off and local corrosion at a point with the coating falling offis generated, by applying an anticoagulant drug fixation method, the activity of heparin is reduced, and by applying a chemical method, pollution is generated. The titanium-nickel alloy material withthe high blood compatibility is characterized by comprising a titanium-nickel alloy substrate, wherein uniform porous structures are distributed in the surface of the titanium-nickel alloy substrate,the porous structures are formed by adopting femtosecond laser ablation, and lubricating oil fills the porous structures. The invention also provides the preparation method of the titanium-nickel alloy material with the high blood compatibility. The titanium-nickel alloy material with the high blood compatibility can be applied to medical implantation and blood contact equipment.

The invention proposes a method for determining the operational conditions of a method for high-repetition rate femtosecond laser ablation for a given material comprising a first step of determining a set of parameters of a burst of laser pulses adapted to generate an ablation crater in the material, the set of parameters comprising an intra-burst repetition frequency f between several hundred MHz and 100 GHz, a number N of pulses of the burst of laser pulses equal to a number Ne of heating and ablation pulses, with Ne being defined by the equation Nc = (L2.f)/D, where L represents a test depth and D represents a thermal diffusion coefficient of the material to be ablated, with Nc being greater than or equal to 10, a characteristic total fluence FTchar of the burst of pulses and a characteristic fluence per pulse Fchar=FTchar/Nc per pulse below an ablation threshold fluence Fs1 of the material by a single laser pulse.

The invention discloses a black silicon material and a preparation method thereof, which solves the shortcomings of the existing selenium-doped black silicon material preparation method. The preparation method comprises: obtaining a clean substrate; A layer of selenium film; under the hydrogen fluoride gas atmosphere, use femtosecond laser scanning ablation; remove silicon oxide on the surface of the material to obtain black silicon material. In the process of femtosecond laser ablation of the substrate material, the present invention introduces fluorine element, and by means of the chemical reaction between fluorine element and substrate silicon material, the black silicon material prepared has a microstructure cone array on the surface, that is, " This black silicon material has a strong light-trapping property, so the absorption wavelength of the black silicon material obtained in this way is expanded, and the absorption rate for visible light and near-infrared bands can be expanded to more than 93%.