Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 18
Book Description
Numerical Simulation of Ultra-short Laser Pulse Energy Deposition and Transport for Material Processing
Author: Simulation of Material Removal Efficiency with Ultrashort Laser Pulses
Author: Publisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
Understanding physical processes accompanying ablation is necessary for optimal use of ultrashort laser pulse (USLP) material processing. We describe the implementation of self-consistent electromagnetic propagation -energy absorption in our numerical models and estimate effect on material removal of energy, pulselength and prepulses.
High-order Harmonic Generation in Laser Plasma Plumes
Author: Rashid A. GaneevPublisher: World Scientific
ISBN: 1848169817
Category : Science
Languages : en
Pages : 250
Book Description
This book represents the first comprehensive treatment of high-order harmonic generation in laser-produced plumes, covering the principles, past and present experimental status and important applications. It shows how this method of frequency conversion of laser radiation towards the extreme ultraviolet range matured over the course of multiple studies and demonstrated new approaches in the generation of strong coherent short-wavelength radiation for various applications. Significant discoveries and pioneering contributions of researchers in this field carried out in various laser scientific centers worldwide are included in this first attempt to describe the important findings in this area of nonlinear spectroscopy.High-Order Harmonic Generation in Laser Plasma Plumes is a self-contained and unified review of the most recent achievements in the field, such as the application of clusters (fullerenes, nanoparticles, nanotubes) for efficient harmonic generation of ultrashort laser pulses in cluster-containing plumes and resonance-induced enhancement of harmonic yield. It can be used as an advanced monograph for researchers and graduate students working in the field of nonlinear spectroscopy. It is also suitable for researchers in laser physics and nonlinear optics who wish to have an overview of the advanced achievements in laser ablation-induced high-order harmonic generation spectroscopy. The carefully presented details of this book will be of value to research devoted to the understanding and control frequency conversion of laser pulses in plasma plumes.The studies described in this book pave the way for the development of a new method of materials studies using the laser ablation-induced high-order harmonic generation spectroscopy, which can exploit the spectral and structural properties of various solid-state materials through their ablation and further propagation of short laser pulse through laser-produced plasma and generation of high-order harmonics.
A Comprehensive Model for Energy Transport and Ablation of Metal Films Induced by Ultrashort Pulsed Lasers
Author: Yunpeng RenPublisher:
ISBN:
Category : Electronic Dissertations
Languages : en
Pages : 105
Book Description
A comprehensive laser material ablation model was developed to describe energy transport, ultrafast phase changes, and material ablation of metal films irradiated by ultrashort laser pulses. The two optical models were incorporated into the TTM to simulate laser energy deposition and the resulting thermal response, ultrafast phase changes from solid to liquid and from liquid to vapor, and phase explosion of metal films irradiated by ultrashort laser pulses. It was found that dynamic optical properties could play a very important role in modeling ultrashort-pulsed laser interactions with metal materials. In the semi-classical TTM, due to the effect of electron drifting, slightly lower electron and lattice temperatures were obtained compared to those calculated by the classical TTM under the same laser irradiation conditions. Higher laser fluence and longer pulse duration could result in more distinct difference between the two models. For multi-pulse irradiations, the results showed that with the same total energy in a laser burst, more pulses with a shorter separation time, e.g., 1 ps, or fewer pulses with a longer separation time, e.g., 100 ps, could achieve higher lattice temperature. Results of laser material ablations show that for high laser fluences phase explosion is a dominating mechanism in material ablation. The simulated ablation depths correlated very well with existing experimental data over a broad range of fluences, 0.6 - 30 J/cm2.
Nanostructured Nonlinear Optical Materials
Author: Rashid A. GaneevPublisher: Elsevier
ISBN: 0128143045
Category : Technology & Engineering
Languages : en
Pages : 434
Book Description
Nanostructured Nonlinear Optical Materials: Formation and Fabrication covers the analysis of the formation, characterization and optical nonlinearities of various nanostructures using different methods. It addresses many areas of research in the field, including the modification of the surfaces of materials for the formation of various nanostructures, transmission electron microscopy and time-of-flight mass spectroscopy studies of ablated bulk and nanoparticle targets, the low-order nonlinearities of metal and semiconductor nanoparticles, the nonlinear refraction and nonlinear absorption of carbon-contained nanoparticles, and low- and high-order harmonic generation in nanoparticle-contained plasmas, amongst other topics. The book is an essential reference for all nanomaterials researchers in the fields of photonics, materials, physics, chemistry and nanotechnology. Present complete coverage of the formation, characterization and optical nonlinearities of nanostructures Builds on basic theory, showing the strengths of the application of nanostructures in optical materials Written by a leading expert in the subject
The Theory of Laser Materials Processing
Author: John DowdenPublisher: Springer
ISBN: 331956711X
Category : Science
Languages : en
Pages : 442
Book Description
The revised edition of this important reference volume presents an expanded overview of the analytical and numerical approaches employed when exploring and developing modern laser materials processing techniques. The book shows how general principles can be used to obtain insight into laser processes, whether derived from fundamental physical theory or from direct observation of experimental results. The book gives readers an understanding of the strengths and limitations of simple numerical and analytical models that can then be used as the starting-point for more elaborate models of specific practical, theoretical or commercial value. Following an introduction to the mathematical formulation of some relevant classes of physical ideas, the core of the book consists of chapters addressing key applications in detail: cutting, keyhole welding, drilling, arc and hybrid laser-arc welding, hardening, cladding and forming. The second edition includes a new a chapter on glass cutting with lasers, as employed in the display industry. A further addition is a chapter on meta-modelling, whose purpose is to construct fast, simple and reliable models based on appropriate sources of information. It then makes it easy to explore data visually and is a convenient interactive tool for scientists to improve the quality of their models and for developers when designing their processes. As in the first edition, the book ends with an updated introduction to comprehensive numerical simulation. Although the book focuses on laser interactions with materials, many of the principles and methods explored can be applied to thermal modelling in a variety of different fields and at different power levels. It is aimed principally however at academic and industrial researchers and developers in the field of laser technology.
Energy Deposition and Transport During High-power and Short-pulse Laser-metal Interactions
Author: Taiqing QiuNumerical Simulations of Ultrashort Laser Pulse Ablation and Plasma Expansion in Ambient Air
Author: Numerical Simulation of Laser Ablation in Pulsed Laser Deposition Process
Author: Zhaohui WeiPublisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 172
Book Description
Laser-material Interaction of Powerful Ultrashort Laser Pulses
Author: Aleksey Mikhaylovich KomashkoPublisher:
ISBN:
Category :
Languages : en
Pages : 480
Book Description