- 标题
- 摘要
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- 实验方案
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Designing a??Supermetalphobica?? Surfaces that Greatly Repel Liquid Metal by Femtosecond Laser Processing: Does the Surface Chemistry or Microstructure Play a Crucial Role?
摘要： It is demonstrated that the wettability of liquid metal (LM) on a substrate is very different from the water wettability. Superhydrophobic and superhydrophilic silicon and polydimethylsiloxane surfaces, respectively, are obtained by femtosecond laser processing and proper chemical modification. All of the structured surfaces have excellent LM repellence, that is, supermetalphobicity, in spite of superhydrophobicity or superhydrophilicity. The experimental comparison and contact model analysis reveal that surface microstructure actually plays a crucial role in endowing a surface with supermetalphobicity while surface chemistry has a little influence on the formation of supermetalphobicity, because the liquid/solid contact is replaced by a solid/solid contact mode for a LM droplet on a textured substrate. It is believed that the established principle for creating supermetalphobic surfaces will enable to accelerate the application progress of LM materials in flexible circuits and liquid robots.
关键词： superhydrophobicity,eutectic gallium–indium,liquid–metal repellence,femtosecond laser processing,supermetalphobicity
更新于2025-09-19 17:13:59
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High-Repetition-Rate Femtosecond Laser Processing of Acrylic Intra-Ocular Lenses
摘要： The study of laser processing of acrylic intra-ocular lenses (IOL) by using femtosecond laser pulses delivered at high-repetition rate is presented in this work. An ultra-compact air-cooled femtosecond diode laser (HighQ2-SHG, Spectra-Physics) delivering 250 fs laser pulses at the fixed wavelength of 520 nm with a repetition rate of 63 MHz was used to process the samples. Laser inscription of linear periodic patterns on the surface and inside the acrylic substrates was studied as a function of the processing parameters as well as the optical absorption characteristics of the sample. Scanning Electron Microscopy (SEM) Energy Dispersive X-ray Spectroscopy (EDX), and micro-Raman Spectroscopy were used to evaluate the compositional and microstructural changes induced by the laser radiation in the processed areas. Diffractive characterization was used to assess 1st-order efficiency and the refractive index change.
关键词： Raman spectroscopy,femtosecond pulses,laser processing,ophthalmic polymers
更新于2025-09-19 17:13:59
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[IEEE 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - Berlin, Germany (2019.6.23-2019.6.27)] 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - In-Situ Laser Processing for 3D Printed Mechanical Transducers
摘要： With the development of our in-situ Laser Processing techniques we provide solutions to both planarize Fused Deposition Modeling (FDM) printed plastics and sintering of inks printed by Direct Ink Writing (DIW). Laser sintering enables fabrication of 3D printed functional and structural layers out of FDM printed thermoplastics and DIW printed conductive inks. As the sintering is in-situ, the sintered conductive layers, produced out of DIW printed silver inks, can be embedded into thermally sensitive FDM printed thermoplastics. In this fashion, vertical stacks out of these materials can be fabricated, in order to achieve capacitive and resistive mechanical transducers.
关键词： laser processing,Digital manufacturing,mechanical sensors,3D printing,transducers
更新于2025-09-19 17:13:59
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Oxygen gain and aluminum loss during laser metal deposition of intermetallic TiAl
摘要： For manufacturing turbine parts for the aeronautical industry, lightweight structural materials like titanium aluminides are used. One well-known example is the alloy Ti-43.5Al-4Nb-1Mo-0.1B (atomic percent) with the commercial name TNM. In previous studies, experiments on laser metal deposition of TiAl were performed to evaluate the potential of the technology to repair defective, damaged, or worn blades. Process conditions including postprocess heat treatment were successfully adjusted. However, oxygen pick-up is still a crucial aspect in laser-based additive manufacturing of Ti- and TiAl-based alloys. In this work, approaches were made to analyze the oxygen pick-up as a function of processing parameters and the powder particle size. The results show that the build rate and the powder particle size affect the oxygen content in the consolidated material.
关键词： laser processing and cladding,intermetallics,phase transformation,aero-engine components,microstructure
更新于2025-09-19 17:13:59
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[IEEE 2019 12th International Conference on Intelligent Computation Technology and Automation (ICICTA) - Xiangtan, China (2019.10.26-2019.10.27)] 2019 12th International Conference on Intelligent Computation Technology and Automation (ICICTA) - Design of Z-Axis Position Servo Control System for Laser Processing Based on Fuzzy PID Control
摘要： In order to solve the problems of low robustness and poor immunity of traditional Z-axis position servo control system for laser processing, a design scheme of Z-axis position servo control system for laser processing based on fuzzy PID control is proposed. The hardware configuration of the system improved and servo controller is added to improve the system performance. Combined with fuzzy PID control principle, the system software operation algorithm and flow are optimized to realize the design of Z-axis position follow-up control system for laser processing. The experimental prototype was built by high-precision laser sensor, and the follow-up control of the laser processing system was realized, so that the laser spot kept a constant distance from the surface to be processed. This laid a foundation for the next intelligent control technology of laser processing.
关键词： Follow-up control,Laser processing,Z-axis position,fuzzy PID control
更新于2025-09-19 17:13:59
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Investigating the features of color laser marking process of galvanic chrome plating in order to create a controlled color image formation at given marking
摘要： The article is devoted to the problems of laser marking of metal surfaces. The factors affecting the color formation during laser processing are considered. To assess the degree of influence of the material thermophysical characteristics on the final result, samples with different properties were used: steel and brass. In order to exclude the influence of other factors on the result, besides the material characteristics, the samples were chrome-plated to obtain the same thickness of the chromium layer. Samples were processed with the same laser parameters and the same marking modes. The results of the experiment showed the formation of various colors on the treated surface, which proves the influence of the thermophysical characteristics of the material being processed on the formation of the color gamma during laser processing.
关键词： Color laser marking,Laser,Chrome steel,Chrome,Laser processing,Chrome-plated brass
更新于2025-09-16 10:30:52
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X-ray radiation protection aspects during ultrashort laser processing
摘要： Ultrashort pulse laser processing of materials allows for precise machining with high accuracy. By increasing the repetition rate to several 100 kHz, laser machining becomes quick and cost-effective. Ultrafast laser processing at high repetition rates and peak intensities above 1013 W/cm2 can cause a potential hazard by generation of unwanted x-ray radiation. Therefore, radiation protection must be considered. For 925 fs pulse duration at a center wavelength of 1030 nm, the x-ray emission in air at a repetition rate of 400 kHz was investigated up to a peak intensity of 2.6 × 1014 W/cm2. Based on the presented measurements, the properties of potential shielding materials will be discussed. By extending our previous works, a scaling of the x-ray radiation emission to higher peak intensities up to 1015 W/cm2 is described, and emitted x-ray doses are predicted.
关键词： laser-induced x-ray emission,ultrashort pulse laser processing,laser ablation,radiation protection
更新于2025-09-16 10:30:52
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Ultrasensitive SERS-Based Plasmonic Sensor with Analyte Enrichment System Produced by Direct Laser Writing
摘要： We report an easy-to-implement device for surface-enhanced Raman scattering (SERS)-based detection of various analytes dissolved in water droplets at trace concentrations. The device combines an analyte-enrichment system and SERS-active sensor site, both produced via inexpensive and high-performance direct femtosecond (fs)-laser printing. Fabricated on a surface of water-repellent polytetrafluoroethylene substrate as an arrangement of micropillars, the analyte-enrichment system supports evaporating water droplet in the Cassie–Baxter superhydrophobic state, thus ensuring delivery of the dissolved analyte molecules towards the hydrophilic SERS-active site. The efficient pre-concentration of the analyte onto the sensor site based on densely arranged spiky plasmonic nanotextures results in its subsequent label-free identification by means of SERS spectroscopy. Using the proposed device, we demonstrate reliable SERS-based fingerprinting of various analytes, including common organic dyes and medical drugs at ppb concentrations. The proposed device is believed to find applications in various areas, including label-free environmental monitoring, medical diagnostics, and forensics.
关键词： SERS,direct laser processing,femtosecond laser pulses,medical drugs,superhydrophobic textures,plasmonic nanostructures,analyte enrichment
更新于2025-09-16 10:30:52
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[Laser Institute of America ICALEO?? 2014: 33rd International Congress on Laser Materials Processing, Laser Microprocessing and Nanomanufacturing - San Diego, California, USA (October 19a??23, 2014)] International Congress on Applications of Lasers & Electro-Optics - Towards the production of glass based printed circuit boards
摘要： This study analyzes laser processing of glass-based printed circuit boards which have the capability to replace conventional substrate materials when electronics are required to operate at elevated temperatures. There is significant potential for glass-based circuit boards within the field of aerospace and electric mobility. The new circuit board concept consists of thin copper-coated borosilicate glass with thicknesses ranging from 150 μm to 500 μm. Conventional mechanical processing of this new circuit boards induces stress on the thin glass which can lead to damage of the substrate. Therefore, laser processing with a picosecond laser source is suggested as a tool within the production process of the new circuit boards. Two necessary processes are investigated using a pulsed picosecond laser with a pulse duration of 7 ps at a wavelength of 515 nm. Precise drill-holes for vertical connections of multilayer boards were produced where chipping at the cutting edge must be avoided. Selective ablation of the copper coating was performed to generate the electrical circuits. The results show that a well-defined ablation process is crucial to achieve adequate electrical isolation without damaging the glass substrate. The study also underlines the huge potential of laser processing with picosecond laser sources, which have proven to be a versatile instrument to drill thin glass and generate electrical circuits by selective ablation.
关键词： copper ablation,picosecond laser,laser processing,borosilicate glass,glass-based printed circuit boards
更新于2025-09-16 10:30:52
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Three-Dimensional Laser-Assisted Patterning of Blue-Emissive Metal Halide Perovskite Nanocrystals inside a Glass with Switchable Photoluminescence
摘要： The high-precision patterning of metal halide perovskites (MHPs) is of paramount importance for their device application. Here, we demonstrate the femtosecond (fs)-laser-assisted formation of three-dimensional MHP nanocrystal (NC) patterns with strong blue photoluminescence (PL) inside an oxide glass. Our strategy enables the crystallization and erasing of CsPb(Cl/Br)3 NCs inside a glass localized around the laser focal area through a combination of fs laser irradiation and thermal treatment processes. These recoverable patterns exhibit a switchable PL associated with the laser-induced defect and the thermal healing of MHP NCs that are benefits from the soft ionic crystal structure and low formation energy of the MHPs. Due to the high stability offered by the protection of the oxide glass matrix, the laser printing of fine-structured MHP micropatterns can be repeated over multiple cycles with a high robustness compared with their colloidal process counterparts. Our results demonstrate a simple strategy for creating emissive patterns inside a stable and transparent solid matrix that could be promising for applications including information storage, three-dimensional displays, anticounterfeit labels, and information security protection.
关键词： three-dimensional patterning,perovskite nanocrystals,reversible photoluminescence,laser-assisted crystallization,femtosecond laser processing
更新于2025-09-16 10:30:52