30 results about "Femtosecond laser ablation" patented technology

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 device for preparing the bionic super-hydrophobic micro-nano surface through femtosecond laser. The device comprises a femtosecond laser unit, a light beam control unit, a motion platform unit and an automatic control unit. The femtosecond laser unit is used for transmitting the femtosecond laser. The light beam control unit is used for controlling power, light beam quality and exposure time of the femtosecond laser. The motion unit is used for controlling the movement amount in the three-dimensional direction of the photo-etched surface. The femtosecond laser unit is arranged behind the light beam control unit. The light beam control unit is arranged above the motion platform unit. The light beam control unit and the motion platform unit are electrically connected with the automatic control unit. The invention further provides a method for preparing the bionic super-hydrophobic micro-nano surface through the femtosecond laser, and the device is adopted in the method. The ablation effect of the femtosecond laser is utilized for forming a micro-nano composite structure similar to the surface of a lotus leaf at a time, secondary modeling is not needed, the process is simple, and the micro-nano structure is stable, good in uniformity and high in hydrophobic function.

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.

Embodiments of the presently disclosed subject matter provide biomimetic cell culture substrates comprising highly tunable patterned polymer nanofiber matrices capable of modulating expression of critical self-renewal factors and markers of cell-cell interaction to maintain stemness of human mesenchymal stem cells in vitro. Embodiments of the presently-disclosed subject matter also provide scalable, highly repeatable methods of making biomimetic cell culture substrates by hot pressing thermoplastic polymer films into femtosecond laser-ablated nanopore molds to form patterned polymer nanofiber matrices on flat thermoplastic substrates.

The invention discloses a gas-liquid parallel tube type grinding wheel double laser trimming device. The gas-liquid parallel tube type grinding wheel double laser trimming device comprises gas-liquidcontrol equipment, a gas-liquid control operating platform, a picosecond laser ablation head, a gas-guide flexible pipe, a grinding machine, focusing lenses, a femtosecond laser ablation head, a femtosecond laser device, a laser device control operating platform, control equipment, a picosecond laser device, a fine water-guide pipe, a superhard grinding-material grinding wheel, a gas column flow,a liquid column flow, laser beams and three-dimensional moving platforms. By means of the gas-liquid parallel tube type grinding wheel double laser trimming device and method, the auxiliary gas-liquidparallel tube type grinding wheel double laser trimming device is provided, the situations that diamond grinding particle chip tolerance space of the grinding wheel is reduced and the height of highlighted binder is not enough caused by plasma particles and phase explosion effect are avoided, and the defects of microcracks, graphite metamorphic layers and the like generated by peripheral heat accumulation during diamond grinding are overcome; and by means of the gas-liquid parallel tube type grinding wheel double laser trimming device and the method, the generation of coulomb explosion can beavoided, the surface grating and micro-cone structure of the grinding wheel are reduced, the utilization efficiency of laser energy is improved, and the grinding wheel trimming efficiency and the trimming surface quality are improved.

The invention provides a method for establishing a laser source model for femtosecond laser ablation simulation. According to the distribution of laser light in space and time, a laser source model with a downward focus is obtained. The proposed three-dimensional model of the laser source can be Describe the situation that the laser focus moves down with material removal in the actual processing process. By dividing the expression into two sections at the position of the processing plane ( ), it is ensured that the laser energy density above the material surface is in line with reality, and in the material The energy density below the surface (i.e. inside the material) is reasonably attenuated, and the proposed 3D model of the laser source can also describe the helical movement of the laser focus on the material plane during actual processing.

The invention provides a method for measuring the Fe isotopic composition of Cr-rich geological samples by laser. By synthesizing Cr-rich glass standard samples, the mass fractionation factor of Cr in the Cr-rich glass standard samples is used to correct the Fe isotope composition in the Cr-rich geological samples to be measured. 54 Cr + right 54 Fe + interference, and by selecting the relevant parameter settings of the femtosecond laser ablation system and using the best cone combination, the mass fractionation in the process of measuring the Fe isotope of the instrument is reduced, and combined with a special correction algorithm, it is effectively deducted 54 Cr + right 54 Fe + Spectral peak interference, realize femtosecond laser combined with multi-receiver inductively coupled plasma mass spectrometry to accurately determine the Fe isotope composition of Cr-rich geological samples, fill the gap in the laser in situ determination of Fe isotope composition of Cr-rich geological samples, and improve the laser in situ analysis technology The application potential in the field of earth science has broad prospects.

The invention relates to a method for preparing a two-dimensional layered nanomaterial MXene quantum dot, comprising: S1: preparing the two-dimensional layered nanomaterial MXene by an etching method; S2: dissolving the two-dimensional layered nanomaterial MXene in In deionized water or an organic solvent, the ablation reaction is carried out under the femtosecond laser; S3: The solution after the femtosecond laser ablation is centrifuged to obtain the supernatant containing the two-dimensional layered nanomaterial MXene quantum dots. The invention utilizes the liquid-phase femtosecond laser ablation method to prepare the two-dimensional layered nanomaterial MXene quantum dots, which is simple and safe to operate, and the cost is low. Green solvents such as deionized water are used to reduce pollution to the environment and have high repeatability. , easy to operate, and can be mass-produced. At the same time, by controlling the power of the femtosecond laser, the particle size and particle size distribution of the two-dimensional layered nanomaterial MXene quantum dots can be controlled, so as to obtain MXene quantum dots with better photoelectric properties.