A5100717071- Laser Material Processing Techniques
- Advanced Surface Polishing Techniques
- Ocular and Laser Science Research
- Advanced machining processes and optimization
- Laser-induced spectroscopy and plasma
- Surface Roughness and Optical Measurements
- Thin-Film Transistor Technologies
- Nonlinear Optical Materials Studies
- Engineering Technology and Methodologies
- Conducting polymers and applications
- Astro and Planetary Science
- Solid State Laser Technologies
- Silicon and Solar Cell Technologies
- Ion-surface interactions and analysis
- Electron and X-Ray Spectroscopy Techniques
- Robotic Path Planning Algorithms
- Additive Manufacturing Materials and Processes
- Inertial Sensor and Navigation
- Laser-Matter Interactions and Applications
- Advanced Sensor and Energy Harvesting Materials
- Mass Spectrometry Techniques and Applications
- Electrospun Nanofibers in Biomedical Applications
- Advanced Machining and Optimization Techniques
- Space Satellite Systems and Control
The University of Tokyo
2019-2024
Kansas State University
2009
Abstract Femtosecond lasers have been applied in the machining of zirconia ( $${{\textrm{ZrO}}_2}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mtext>ZrO</mml:mtext> <mml:mn>2</mml:mn> </mml:msub> </mml:math> ) ceramics because their ultrashort pulse duration and high peak power. However, high-precision micromachining remains challenging owing to an unclear understanding ultrafast laser–material interaction mechanisms. In this study, transient processing...
The internal modification of glass using ultrashort pulse lasers has been attracting attention in a wide range applications. However, the remarkably low processing speed impeded its use industry. In this study, we achieved ultrafast by coaxially focusing single-pulse femtosecond laser and continuous-wave (CW) with wavelength that is transparent to glass. Compared conventional method, increased factor 500. observation high-speed phenomena revealed CW was absorbed seed electrons were generated...
In accordance with the increasing demand for high-speed processing, repetition rate of ultrashort pulse lasers has continued to increase. With development these lasers, there is a growing prediction shapes processed at high rates. However, major challenge, because difficulty associated estimation heat accumulation. this study, we developed simulation laser drilling in glass including accumulation calculation between pulses. model, temperature considered as an additional criterion material...
Ultrashort-pulse lasers (USPLs) are used in the machining of zirconia ceramics (ZrO2) because their extremely high peak intensities. However, highly efficient and precision microprocessing ZrO2 remains challenging. In this study, we applied a transient selective laser (TSL) processing technique by combining USPL continuous-wave (CW) to realize ultrafast drilling opaque ZrO2. Ultra-high-efficiency TSL was achieved with efficiency 1800 times higher than that drilling. The material removal...
Microgroove processing of glass is important in many fields, however, it difficult to achieve the with a high speed. In this study, we developed novel method for high-speed microgroove using two types lasers, namely femtosecond laser and near-infrared continuous-wave (CW) laser. A single pulse was initially focused on surface material, enabling area absorb CW laser, which otherwise not absorbed by glass. The then scanned along material surface, expanding machined hole form groove. resulting...
Transient and selective laser (TSL) processing is a method used for the rapid fabrication of transparent materials. In this method, electrons in glass are excited by an ultrashort-pulse laser. This electron-excited region selectively absorbs long-pulse with low intensity, resulting microfabrication. However, mechanism material removal during TSL not completely understood. study, we measured threshold synthetic fused silica to investigate details mechanism. The measurement revealed that was...
The application of the manipulator to directional adjustments space electric thrusters can effectively expand thrust and improve operational flexibility. To avoid any potential collisions between end thruster, as well interference with solar panel or plume, a real-time collision detection algorithm is proposed for thrust-vector adjustment mechanism manipulator. Using minimum bounding model, arm rod, thruster their plumes, surface obstacles satellite, be equivalent cylindrical, cone cuboid...
We have used few-cycle IR and EUV laser pulses in pump-probe arrangement to trace out the dissociation pathways CO when exploded by strong fields. present two preliminary sets of data different pump pulses. In these sets, excited state cations are populated using (< 10 fs) IR, respectively. followed time evolution states time-resolved Coulomb explosion imaging technique. compare IR- EUV-induced measuring KER fragment ions as a function delay between probe pulse.
Titanium alloys are widely used in aerospace applications due to their excellent material properties. Nevertheless the low machining speed and short tool life represent high cost of titanium alloys. Laser assisted (LAM) has been developed be an advanced technique machine this kind hard-to-machine improve machinability. Most researches field conducted assess effect various cutting parameters optimize condition maximum benefits LAM. Therefore, primary objective study is evaluate influence...
Machining of titanium alloys has the problems high machining costs and short tool life owing to their specific strength corrosion resistance. Laser-assisted (LAM) is a method that addresses aforementioned issues. In this study, we proposed LAM system heats workpiece before cutting zone improve machinability alloys. The experiments were conducted with laser power varying from 20 W 60 at different speeds. Measurements wear revealed 55% increase in compared conventional (CM). promising for...