Download or read book Plasma High Harmonic Generation and Single Attosecond Pulse Emission from Ultraintense Laser Pulses written by Suo Tang and published by . This book was released on 2018 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High order Harmonic Generation in Laser Plasma Plumes written by Rashid A. Ganeev and published by World Scientific. This book was released on 2013 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.

Download or read book Frequency Conversion of Ultrashort Pulses in Extended Laser Produced Plasmas written by Rashid A Ganeev and published by Springer. This book was released on 2016-02-13 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book offers a review of the use of extended ablation plasmas as nonlinear media for HHG of high-order harmonic generation (HHG). The book describes the different experimental approaches, shows the advantages and limitations regarding HHG efficiency and discusses the particular processes that take place at longer interaction lengths, including propagation and quasi-phase matching effects. It describes the most recent approaches to harmonic generation in the extreme ultraviolet (XUV) range with the use of extended plasma plumes, and how these differ from more commonly-used gas-jet sources. The main focus is on studies using extended plasmas, but some new findings from HHG experiments in narrow plasma plumes are also discussed. It also describes how quasi-phase-matching in modulated plasmas, as demonstrated in recent studies, has revealed different means of tuning enhanced harmonic groups in the XUV region. After an introduction to the fundamental theoretical and experimental aspects of HHG, a review of the most important results of HHG in narrow plasmas is presented, including recent studies of small-sized plasma plumes as emitters of high-order harmonics. In Chapter 2, various findings in the application of extended plasmas for harmonic generation are analyzed. One of the most important applications of extended plasmas, the quasi-phase-matching of generated harmonics, is demonstrated in Chapter 3, including various approaches to the modification of perforated plasma plumes. Chapter 4 depicts the nonlinear optical features of extended plasmas produced on the surfaces of different non-metal materials. Chapter 5 is dedicated to the analysis of new opportunities for extended plasma induced HHG. The advantages of the application of long plasma plumes for HHG, such as resonance enhancement and double-pulse method, are discussed in Chapter 6. Finally, a summary section brings together all of these findings and discuss the perspectives of extended plasma formations for efficient HHG and nonlinear optical plasma spectroscopy. The book will be useful for students and scholars working in this highly multidisciplinary domain involving material science, nonlinear optics and laser spectroscopy. It brings the new researcher to the very frontier of the physics of the interaction between laser and extended plasma; for the expert it will serve as an essential guide and indicate directions for future research.

Download or read book High Order Harmonics Generation in Plasmas written by Rashid A. Ganeev and published by Springer Nature. This book was released on 2022-08-01 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book comprises a detailed consideration of novel approaches developed in the field of frequency conversion of laser sources in laser-induced plasmas during the last few years. The aim of the book is to support researchers and other readers in their development in the area of high-order nonlinear spectroscopy. Particularly, the advanced studies of nanoparticles and quantum dots for the formation of new sources of radiation in different short-wavelength spectral ranges show the ways to further implement the specific features of small-sized species in a relatively new field of study—laser ablation induced high-order harmonics generation spectroscopy. Researchers involved in the development of new methods of frequency conversion will benefit from finding the most recent advances in this field. Undergraduate students will discover interesting information about recent findings in plasma harmonic research. Additionally, the usefulness of the book will be demonstrated by the potential applications of the new knowledge developed during recent years for ultrafast pulse generation using the proposed schemes of plasma-light interaction. Thus, the audience may also include those researchers involved in state-of-the-art developments in attophysics. Additionally, any professionals interested in the application of the advanced techniques for material science will also benefit from updating their knowledge of new methods of material studies using high-order nonlinear spectroscopy.

Download or read book Towards Intense Single Attosecond Pulse Generation from a 400 NM Driving Laser written by Yan Cheng and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Attosecond pulse generation is a powerful tool to study electron dynamics in atoms and molecules. However, application of attosecond pulses is limited by the low photon flux of attosecond sources. Theoretical models predict that the harmonic efficiency scales as [lambda][superscript]-6 in the plateau region of the HHG spectrum, where [lambda] is the wavelength of the driving laser. This indicates the possibility of generating more intense attosecond pulses using short wavelength driving lasers. The purpose of this work is to find a method to generate intense single attosecond pulses using a 400 nm driving laser. In our experiments, 400 nm femtosecond laser pulses are used to generate high harmonics. First, the dependence of the high harmonic generation yield on the ellipticity of 400 nm driving laser pulse is studied experimentally, and it is compared with that of 800 nm driving lasers. A semi-classical theory is developed to explain the ellipticity dependence where the theoretical calculations match experiment results very well. Next, 400 nm short pulses (sub-10 fs) are produced with a hollow core fiber and chirped mirrors. Finally, we propose a scheme to extract single attosecond pulses with the Generalized Double Optical Gating (GDOG) method.

Download or read book Interaction Of Mid infrared Parametric Waves In Laser Plasmas written by Rashid Ganeev and published by World Scientific. This book was released on 2017-02-27 with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is interesting to analyze the application of mid-infrared (MIR, 1000-5000 nm) radiation to study the dynamics of the nonlinear optical response of ablated molecular structures compared with commonly used Ti: sapphire lasers for plasma high-order harmonic generation (HHG), including the studies of extended harmonics at a comparable conversion efficiency with shorter wavelength laser sources, and a search for new opportunities in improvement of the HHG conversion efficiency in the mid-IR range, such as the application of clustered molecules. This book shows the most recent findings of various new schemes of the application of MIR pulses for HHG in laser-produced low-ionised, low-density plasma plumes, which could be dubbed for simplicity as 'plasma harmonics'. The use of any element of the periodic table, as well as thousands of complex samples that exist as solids largely extends the range of materials employed, whereas only a few rare gases are typically available for gas HHG. The exploration of practically any solid-state material through the nonlinear spectroscopy comprising laser ablation and harmonic generation can be considered as a new tool for materials science. Thus the MIR pump based laser-ablation-induced high-order harmonic generation spectroscopy can be considered a new method for the study of materials and one of most important applications of plasma HHG.

Download or read book High Harmonic Radiation Generation and Attosecond Pulse Generation from Intense Laser Solid Interactions written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have studied ion motion effects in high harmonic generation, including shifts to the harmonics which result in degradation of the attosecond pulse train, and how to mitigate them. We have examined the scaling with intensity of harmonic emission. We have also switched the geometry of the interaction to measure, for the first time, harmonics from a normal incidence interaction. This was performed by using a special parabolic reflector with an on axis hole and is to allow measurements of the attosecond pulses using standard techniques. Here is a summary of the findings: First high harmonic generation in laser-solid interactions at 1021 Wcm-2, demonstration of harmonic focusing, study of ion motion effects in high harmonic generation in laser-solid interactions, and demonstration of harmonic amplification.

Download or read book Experimental Studies of Harmonic Generation from Solid density Plasmas Produced by Picosecond Ultra intense Laser Pulses written by Liang Zhao and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, an experimental investigation of harmonic generation from high-intensity laser-plasma interactions is presented. Harmonic experiments performed on the 1-terawatt FCM-CPA laser system at the University of Toronto, and on the 10-terawatt T3 laser system at the University of Michigan, are described. Using the FCM-CPA laser, various aspects of second harmonic generation were investigated systematically, with a focus on the effect of preformed plasma on harmonic generation. Experiments comparing harmonics generated by high-contrast pulses and by pulses containing weak prepulses show that the preformed plasma causes spatial and spectral breakup of harmonics and diffuses harmonic emission into large solid angles. On the T3 laser system, mid-order harmonic generation from various solid materials was studied and both odd and even harmonics up to the 7th were observed. Important features of harmonic generation, i.e., the laser-polarization dependence and the angular distribution of harmonic emission, were characterized. Pump-probe experiments were carried out as well on both laser systems by adding a controlled prepulse, which demonstrated a strong dependence of harmonic production efficiency on the gradient of preformed plasma. We also describe what we believe to be the first observation of regular satellite features accompanying the mid-order harmonics. Their dependence on target materials and on laser intensity was measured, and possible physical explanations are discussed. Besides, the development of the Toronto FCM-CPA laser system is summarized. Its original design and unique features are described in detail.

Download or read book Improvements for Generating High Order Harmonics and Attosecond Pulses with Ultrashort Laser Fields written by Dian Peng and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear processes of high-order harmonic generation (HHG) produced by ultrashort few-cycle laser pulses possess interesting features which HHG produced by long pulses of many cycles may not have. First, HHG spectra produced by ultrashort pulses are extremely sensitive to the driving pulse waveform, which can be controlled by laser parameters such as carrier-envelope phases (CEPs), time delays or frequency chirps. Second, HHG spectra produced by ultrashort pulses can exhibit broad uneven peaks which are different from usual odd-ordered harmonic peaks that long pulses produce. Based on the high sensitivity on pulse waveform of HHG spectra produced by ultrashort pulses, we investigate for a two-color few-cycle pulse how HHG can be enhanced by the use of time delays or frequency chirps. Both a numerical and an analytic method are employed to calculate HHG spectra from a single H atom. For the time delay case, our results show that a time delay between the two-color, few-cycle pulses can increase the intensity of an HHG spectrum by an order of magnitude (or more) compared to the no-time-delay case at the cost of a reduction in the HHG plateau cutoff energy. For the frequency chirp case, we show how changing signs of chirps in each of the two component few-cycle pulses leads to drastic changes in the HHG spectra. Both time-frequency analyses from the numerical method and a semiclassical interpretation from the analytic method provide clear physical explanations of how HHG spectra are changed by those time delays and chirp signs.Based on the broad uneven peaks in HHG spectra produced by ultrashort pulses, we investigate how the duration of an isolated attosecond pulse can be minimized by carefully selecting frequencies in an HHG spectrum and provide a solution for the attochirp problem in generating attosecond pulses. Specifically, three frequency-selection categories are studied: a single spectral range between cutoffs, a single spectral range across cutoff and a striped-frequency range. Our results show that among all three categories the striped-frequency range produces the shortest and strongest attosecond pulses for a broad HHG spectrum with transform-limited duration.

Download or read book Coherence and Ultrashort Pulse Laser Emission written by F. J. Duarte and published by BoD – Books on Demand. This book was released on 2010-12-30 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this volume, recent contributions on coherence provide a useful perspective on the diversity of various coherent sources of emission and coherent related phenomena of current interest. These papers provide a preamble for a larger collection of contributions on ultrashort pulse laser generation and ultrashort pulse laser phenomena. Papers on ultrashort pulse phenomena include works on few cycle pulses, high-power generation, propagation in various media, to various applications of current interest. Undoubtedly, Coherence and Ultrashort Pulse Emission offers a rich and practical perspective on this rapidly evolving field.

Download or read book Third Harmonic Generation with Ultra high Intensity Laser Pulses written by N. J. Fisch and published by . This book was released on 1992 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Applications of Laser Plasma Interactions written by Shalom Eliezer and published by CRC Press. This book was released on 2008-12-22 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent advances in the development of lasers with more energy, power, and brightness have opened up new possibilities for exciting applications. Applications of Laser-Plasma Interactions reviews the current status of high power laser applications. The book first explores the science and technology behind the ignition and burn of imploded fusion fue

Download or read book Third Harmonic Generation with Ultra high Intensity Laser Pulses written by and published by . This book was released on 1992 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: When an intense, plane-polarized, laser pulse interacts with a plasma, the relativistic nonlinearities induce a third harmonic polarization. A phase-locked growth of a third harmonic wave can take place, but the differences between the nonlinear dispersion of the pump and driven waves leads to a rapid unlocking, resulting in a saturation. What becomes third harmonic amplitude oscillations are identified here, and the nonlinear phase velocity and the renormalized electron mass due to plasmon screening are calculated. A simple phase-matching scheme, based on a resonant density modulation, is then proposed and analyzed.

Download or read book Laser Plasma Interactions written by Dino A. Jaroszynski and published by CRC Press. This book was released on 2009-03-27 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: A Solid Compendium of Advanced Diagnostic and Simulation ToolsExploring the most exciting and topical areas in this field, Laser-Plasma Interactions focuses on the interaction of intense laser radiation with plasma. After discussing the basic theory of the interaction of intense electromagnetic radiation fields with matter, the book covers three ap

Download or read book Control of Nonlinear Laser Pulse Propagation in Plasma with Strong Magnetic Fields written by Thomas Cunningham Wilson and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: We examine nonlinear laser pulse dynamics in plasma, encompassing both transverse and longitudinal envelope effects, in isolation and when coupled by the plasma. This is underpinned by an interest in how strong magnetic fields, aligned along the laser axis, modify these processes.In the presence of a strong magnetic field, such that the electron cyclotron frequency is on the order of the laser frequency, there is dramatic modification to the laser-plasma interactions,with the electron motion under left circularly polarised light remaining weakly-relativistic-like at laser intensities typically associated with fully-relativistic behaviour. Conversely right circularly polarised light sees the opposite effect, with the laser-plasma interactions becoming nonlinear at much lower light intensities. This affects all processes underpinned by relativistic motion of the electrons, chiefly self-focusing and self-compression. Such processes are studied in detail for both unmagnetised and magnetised plasma, and the results are compared. We find that not only does an external field alter the relativistic response of the electrons, but it also modifies the laser group and phase velocities, making the pulse shape of interest to the envelope dynamics. We apply this to study spherical compression of a laser pulse, wherein the pulse dimensions reduce symmetrically towards a single cycle. This process results in greatly amplified single-cycle pulses in the lambda-cubic regime, which may peak at over 100 times the initial laser intensity. Finally, the process by which a fully relativistic pulse may amplify an existing magnetic field is examined. We find that while this effect is known of for Laguerre-Gaussian light, it can also occur for linearly polarised light. The pondero motive effect of the laser, and the external field trapping particles which would otherwise escape, bends their trajectories such that a self-sustaining azimuthal current forms. This current scales with both laser intensity and plasma density, and may produce fields of up to 10 kilotesla. We offer that this work may be of interest for the manipulation of low-power or long-wavelength lasers in underdense plasma, the generation of single-cycle pulses for high-harmonic generation and the generation of localised,quasistatic ultra-intense magnetic fields.

Download or read book Generation of Ultrahigh Intensity Laser Pulses written by N. J. Fisch and published by . This book was released on 2003 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Physics Of Laser Plasma Interactions written by William Kruer and published by CRC Press. This book was released on 2019-08-20 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the physics of laser plasma interactions and presents a complementary and very useful numerical model of plasmas. It describes the linear theory of light wave propagation in plasmas, including linear mode conversion into plasma waves and collisional damping.