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Author: Sudipta Bera Publisher: LAP Lambert Academic Publishing ISBN: 9783838363769 Category : Interferometry Languages : en Pages : 148
Book Description
A novel femtosecond micromachining workstation that permits real-time measurement of ablation depth and transient reflectivity is demonstrated. This instrumentation is used to characterize two processes: micromachining of thin metal films, and laser induced forward transfer (LIFT). Spectral interferometry was incorporated in a femtosecond micromachining system to enable real-time visualization of micromachined features as they are written into thin metal films-low energy(pJ) femtosecond oscillator pulses are used to probe the sample as it is cut by high energy (uJ) pulses. Sub-wavelength depths are readily resolved using this technique, making it possible to monitor the integrity of micromachined structures as they are created. This technique can also be employed to characterize interesting processes such as laser induced forward transfer (LIFT) of thin metal films. LIFT essentially involves using a pulsed laser to pattern a structure by deposition as opposed to ablation. Using modest numerical apertures (0.65 or less) we have been able to produce submicron features using this method of femtosecond pulsed laser deposition.
Author: Sudipta Bera Publisher: LAP Lambert Academic Publishing ISBN: 9783838363769 Category : Interferometry Languages : en Pages : 148
Book Description
A novel femtosecond micromachining workstation that permits real-time measurement of ablation depth and transient reflectivity is demonstrated. This instrumentation is used to characterize two processes: micromachining of thin metal films, and laser induced forward transfer (LIFT). Spectral interferometry was incorporated in a femtosecond micromachining system to enable real-time visualization of micromachined features as they are written into thin metal films-low energy(pJ) femtosecond oscillator pulses are used to probe the sample as it is cut by high energy (uJ) pulses. Sub-wavelength depths are readily resolved using this technique, making it possible to monitor the integrity of micromachined structures as they are created. This technique can also be employed to characterize interesting processes such as laser induced forward transfer (LIFT) of thin metal films. LIFT essentially involves using a pulsed laser to pattern a structure by deposition as opposed to ablation. Using modest numerical apertures (0.65 or less) we have been able to produce submicron features using this method of femtosecond pulsed laser deposition.
Author: Tatiana Itina Publisher: BoD – Books on Demand ISBN: 9535136992 Category : Science Languages : en Pages : 292
Book Description
Shortly after the demonstration of the first laser, the most intensely studied theoretical topics dealt with laser-matter interactions. Many experiments were undertaken to clarify the major ablation mechanisms. At the same time, numerous theoretical studies, both analytical and numerical, were proposed to describe these interactions. These studies paved the ways toward the development of numerous laser applications, ranging from laser micro- and nanomachining to material analysis, nanoparticle and nanostructure formation, thin-film deposition, etc. Recently, more and more promising novel fields of laser applications have appeared, including biomedicine, catalysis, photovoltaic cells, etc. This book intends to provide the reader with a comprehensive overview of the current state of the art in laser ablation, from its fundamental mechanisms to novel applications.
Author: Mihai Stafe Publisher: Springer Science & Business Media ISBN: 3642409784 Category : Science Languages : en Pages : 241
Book Description
The book introduces ‘the state of the art' of pulsed laser ablation and its applications. It is based on recent theoretical and experimental studies. The book reaches from the basics to advanced topics of pulsed laser ablation. Theoretical and experimental fundamental phenomena involved in pulsed laser ablation are discussed with respect to material properties, laser wavelength, fluence and intensity regime of the light absorbed linearly or non-linearly in the target material. The energy absorbed by the electrons leads to atom/molecule excitation, ionization and/or direct chemical bond breaking and is also transferred to the lattice leading to material heating and phase transitions. Experimental non-invasive optical methods for analyzing these phenomena in real time are described. Theoretical models for pulsed laser ablation and phase transitions induced by laser beams and laser-vapour/plasma interaction during the plume expansion above the target are also presented. Calculations of the ablation speed and dimensions of the ablated micro- and nano-structures are performed. The validity and required refinement of different models in different experimental conditions is provided. The pulsed laser deposition process which bases on collecting the ablated particles on a surface is analyzed in terms of efficiency and quality of the deposited films as a function of ambient conditions, target material, laser parameters and substrate characteristics. The interaction between the incident laser and the ablation plasma is analyzed with respect to its influence on the structures of the deposited films and its capacity to generate high harmonics and single attosecond pulses which are highly desirable in pump-probe experiments.
Author: Dongfang Yang Publisher: BoD – Books on Demand ISBN: 9535128116 Category : Technology & Engineering Languages : en Pages : 430
Book Description
Laser ablation refers to the phenomenon in which a low wavelength and short pulse (ns-fs) duration of laser beam irradiates the surface of a target to induce instant local vaporization of the target material generating a plasma plume consisting of photons, electrons, ions, atoms, molecules, clusters, and liquid or solid particles. This book covers various aspects of using laser ablation phenomenon for material processing including laser ablation applied for the deposition of thin films, for the synthesis of nanomaterials, and for the chemical compositional analysis and surface modification of materials. Through the 18 chapters written by experts from international scientific community, the reader will have access to the most recent research and development findings on laser ablation through original research studies and literature reviews.
Author: Zachary W. Karg Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
While laser ablation using a nanosecond laser is well understood, there remain gaps in our understanding of the ablation process associated with a femtosecond laser. These gaps are a result of the short time scales associated with a femtosecond laser. Using molecular dynamics (MD) simulations can provide an understanding of the physical phenomena occurring in the short time scales of femtosecond laser ablation. Here, the aim is to perform a parametric study to understand the physical process associated with femtosecond laser ablation and the consequent shock wave in the surrounding media. Results from the simulations showed a plume expansion process as well as the velocity of the particles ejected from the material. It was concluded from this that MD simulations are a viable option for understanding the ablation process in femtosecond laser ablation. This research also concluded that the user of MD simulations must know and understand the input commands to properly model the physics of laser ablation. Femtosecond laser ablation (LA) results from this study can be used for applications in precision machining, medical, dielectrics, and precision agriculture.
Author: Sudipta Bera
Author: Sudipta Bera
Author: Sudipta Bera
Author: Tatiana Itina
Author: Mihai Stafe
Author: Dongfang Yang
Author: Bo Toftmann
Author: Jayesh C. Jaspara
Author: Zachary W. Karg![Laser-ablation Deposition and Characterization of Polycrystalline Nd-modified Pb(Zr, Ti)O[sub 3] Thin Films PDF](https://books.google.com/books/content/images/frontcover/oO80KwAACAAJ?fife=w80-h100)
Author: Jyrki Lappalainen
Author: