A5076038302- Laser Material Processing Techniques
- Laser and Thermal Forming Techniques
- Laser-induced spectroscopy and plasma
- Ocular and Laser Science Research
- Advanced Surface Polishing Techniques
- Nonlinear Optical Materials Studies
- Orbital Angular Momentum in Optics
- Tribology and Lubrication Engineering
- Photorefractive and Nonlinear Optics
- Advanced Optical Imaging Technologies
- Laser-Matter Interactions and Applications
- Advanced Numerical Analysis Techniques
- Laser Design and Applications
- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Laser-Ablation Synthesis of Nanoparticles
- Surface Roughness and Optical Measurements
- Diamond and Carbon-based Materials Research
- Solid State Laser Technologies
- Adhesion, Friction, and Surface Interactions
- Advanced Combustion Engine Technologies
- Metal Forming Simulation Techniques
- Semiconductor Lasers and Optical Devices
- Gyrotron and Vacuum Electronics Research
- Particle accelerators and beam dynamics
University of Liverpool
2015-2024
Hubei University of Technology
2012
University of Manchester
2007-2010
Nonlinear Control Strategies (United States)
2010
Oak Ridge National Laboratory
2009
Fraunhofer USA
2007
Fraunhofer Institute for Material and Beam Technology
2007
Poznań University of Technology
2006-2007
Łukasiewicz Research Network - Metal Forming Institute
2005
Pennsylvania State University
2004
The use of a liquid-crystal spatial light modulator (SLM) device to convert linearly polarized femtosecond laser beam into radially or azimuthally vortex is demonstrated. In order verify the state polarization at focal plane, induced periodic surface structures (LIPSS) are produced on stainless steel, imprinting complex vectorial and confirming efficacy SLM in producing desired modes. Stainless steel plates various thicknesses micromachined with beams resulting cut-outs analysed. process...
The polarization state of an ultrafast laser is dynamically controlled using two Spatial Light Modulators and additional waveplates. Consequently, four states polarization, linear horizontal vertical, radial azimuthal, all with a ring intensity distribution, were switched at frequency ν = 12.5 Hz while synchronized motion control system. This technique, demonstrated here for the first time, enables remarkable level real-time properties light waves applied to surface patterning, shows that...
Combustion is one of the most dominant energy conversion processes used in all areas human life, but global concerns over exhaust gas pollution and greenhouse emission have stimulated further development process. Lean combustion recirculation are approaches to improve efficiency reduce pollutant emissions; however, such measures impede reliable ignition when applied conventional systems. Therefore, alternative systems a focus scientific research. Amongst others, laser induced seems an...
We report on new developments in wavefront and polarization control for ultrashort-pulse laser microprocessing.We use two Spatial Light Modulators combination to structure the optical fields of a picosecondpulse beam, producing vortex wavefronts radial or azimuthal states.We also carry out first demonstration multiple first-order beams with states, produced using Computer Generated Holograms.The are used nano-structure highly polished metal surface.Laser Induced Periodic Surface Structures...
Laser ignition (LI) has been shown to offer many potential benefits compared spark (SI) for improving the performance of internal combustion (IC) engines. This paper outlines progress made in recent research on laser ignited IC engines, discusses advantages and control opportunities considers challenges faced prospects its future implementation. An experimental effort underway at University Liverpool (UoL) extend stratified speed/load operating region gasoline direct injection (GDI) engine...
Precise tailoring of optical vector beams is demonstrated, shaping their focal electric fields and used to create complex laser micro-patterning on a metal surface. A Spatial Light Modulator (SLM) micro-structured S-waveplate were integrated with picosecond system employed structure the into radial azimuthal polarizations without vortex phase wavefront as well superposition states. Imprinting Laser Induced Periodic Surface Structures (LIPSS) elucidates detailed around region. In addition...
Ultrafast laser parallel microdrilling using diffractive multiple annular beam patterns is demonstrated in this paper. The was generated by axicon computer holograms (CGHs) a spatial light modulator. diameter of the can be easily adjusted varying radius smallest ring axicon. Multiple beams with arbitrary arrangement and arrays were superimposing an CGH onto grating lenses algorithm calculated multi-beam binary Dammann CGH, respectively. Microholes drilled through 0.03 mm thick stainless...
This study describes the preparation and analysis of laser micro-structured nickel metal electrodes for application as a cathode material in micro-batteries based on oxyhydroxide chemistry. Using ultra-short pulse length lasers (picoseconds to femtoseconds); surface micro-structures form ripples are rapidly generated at cathodes. These ripple micro-structures, with periodic spacing approximately equal wavelength radiation used, more commonly referred laser-induced plasmonic structures...
Laser forming (LF) offers the industrial promise of controlled shaping metallic and non-metallic components for prototyping, correction design shape or distortion precision adjustment applications. The potential process advantages include precise incremental adjustment, flexibility application no mechanical 'spring-back' effect. To date there has been a considerable amount work carried out on two-dimensional LF, using multi-pass straight line scan strategies to produce reasonably bend angle...