Download or read book Mid infrared Strong field Laser Interactions with Nanoclusters and Semiconductors written by Zhou Wang (Ph. D. in physics) and published by . This book was released on 2018 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the interaction of intense infrared lasers with atoms/molecules, an ionized election is accelerated by the laser field, and revisits the parent ion. High energy electrons are generated after rescattering with the ion, or alternatively, harmonic photons are emitted as attosecond bursts after electron-ion recombination. However, the validity of the picture requires verification in condensed-phase targets. This study discusses the behavior of nanoclusters and semiconductors under intense femtosecond laser fields. In the laser interaction with nanoclusters, photoelectron and charged ion emission are investigated at various driving laser wavelengths. In the study of photoelectrons, we show that the laser-field-driven rescattering picture is still valid in nanoclusters after adaptions. With the help of tunable laser wavelength, we observe an extension of cutoff energy and discover its universal scaling with the cluster size and driving wavelength. On the other hand, a wavelength-dependent ion emission is observed, which sheds light on the underlying cluster dynamics. In addition, the ion emission is managed to be controlled with a tailored pulse. In the laser interaction with semiconductors, the high harmonic photon emission driven by mid-infrared lasers are measured, which comes from distinct mechanisms from atoms/molecules. The roles of photocarrier density and driving wavelength are explored, which not only convey the information of underlying mechanisms, but also suggest approaches to optimize the harmonic generation conditions for future table-top attosecond burst generation. Moreover, a two-color beam is applied to drive the harmonic emission from solids and an enhanced frequency-upconversion efficiency is observed.
Download or read book Strong Field Physics with Mid Infrared Lasers written by and published by . This book was released on 2001 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mid-infrared gas laser technology promises to become a unique tool for research in strong-field relativistic physics. The degree to which physics is relativistic is determined by a ponderomotive potential. At a given intensity, a 10 [mu]m wavelength CO2 laser reaches a 100 times higher ponderomotive potential than the 1 [mu]m wavelength solid state lasers. Thus, we can expect a proportional increase in the throughput of such processes as laser acceleration, x-ray production, etc. These arguments have been confirmed in proof-of-principle Thomson scattering and laser acceleration experiments conducted at BNL and UCLA where the first terawatt-class CO2 lasers are in operation. Further more, proposals for the 100 TW, 100 fs CO2 lasers based on frequency-chirped pulse amplification have been conceived. Such lasers can produce physical effects equivalent to a hypothetical multi-petawatt solid state laser. Ultra-fast mid-infrared lasers will open new routes to the next generation electron and ion accelerators, ultra-bright monochromatic femtosecond x-ray and gamma sources, allow to attempt the study of Hawking-Unruh radiation, and explore relativistic aspects of laser-matter interactions. We review the present status and experiments with terawatt-class CO2 lasers, sub-petawatt projects, and prospective applications in strong-field science.
Download or read book Mid Infrared Lasers and Their Interactions with Solids Liquids and Plasmas written by Rotem Kupfer and published by . This book was released on 2019 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mid-infrared lasers have attracted significant attention over recent years because of the favorable scaling of many physical processes with increasing wavelength. We will present the development of mid-IR oscillators and the fabrication of gain media at UT Austin. We will then focus on two experiments using a mid-IR high average power, nanosecond laser: 1) A study of harmonic generation in polycrystalline semiconductors where we observed unusual scaling of the harmonics with the pump pulse energy. We developed a numerical model of the cascade random-quasi-phase-matched three-wave-mixing processes to explain the experimental observations. 2) A study of the plasma characteristics in laser induced breakdown spectroscopy with a nanosecond mid-IR excitation source. Using spectral measurements and a framing camera we observed a spatial separation of the plasma plume, increased emission signal with low white light generation, and a drop in the apparent plasma density with increasing pump energy. Our results can be explained by continuous heating of the plasma by the pump pulse due to the more efficient inverse bremsstrahlung absorption at longer wavelengths
Download or read book Strong Field Phenomena in Atoms and Molecules from Near to Midinfrared Laser Fields written by Yu Hang Lai and published by . This book was released on 2018 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: While most of the early experiments were performed in the near-infrared (NIR)(0.8 or 1 $\mu$m) wavelengths, an important advance over the last decade has been the emergence of intense mid-infrared (MIR)($\sim 2-4$ $\mu$m) sources. The quadratic scaling of $U_p$ with wavelength benefits the study of recollision-driven phenomena and also enables the exploration of strong field interaction deep in the tunneling regime. In addition, the MIR regime is of particular interest for studying molecules due to the presence of vibrational resonances. In this dissertation, we explore several strong field phenomena in atoms and molecules with near and mid infrared fields, including:
Download or read book Scaled Strong Field Interactions at Long Wavelengths written by Emily Frances Sistrunk and published by . This book was released on 2011 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: The strong field regime describes interactions between light and matter where the electric field of the laser is a significant fraction of the binding field of the atom. Short pulsed lasers are capable of producing local fields on the order of the atomic unit of electric field. Under the influence of such strong fields, the ionization regime and electron dynamics are highly dependent on the wavelength used to drive the interaction. Few studies have been performed in the mid-infrared (MIR) spectral range. Using MIR wavelengths, the ponderomotive energy, Up, imposed on the electrons is a factor of 20 greater than in the visible and near-infrared. Experiments on above threshold ionization (ATI) of cesium, nonsequential ionization (NSI) of noble gases, and high harmonic generation (HHG) in condensed phase media highlight the benefits of performing strong field investigations in the MIR. The photoelectron energy spectrum from ATI of atoms provides details about the strong field interaction. Cesium atoms driven by a 3.6 um laser indicate that excited states can play a large role in ionization from the ground state. Previous experiments on argon in the near-infrared can be compared to cesium at 3.6 um due to their similar Keldysh-scaling. The ground state of cesium experiences a large Stark shift, unlike similar experiments in argon. The low-lying 6P excited states of cesium produce a strong effect on the photoelectron energy spectrum, resulting in a splitting of each ATI peak. Enhancements in the photoelectron energy spectrum similar to those found in argon are observed in cesium. These enhancements are relatively insensitive to ellipticity of the drive laser. To take advantage of the large ponderomotive energy associated with Mid-IR lasers, ionization of argon, krypton and xenon is studied at 3.6 um. Electrons ionized by the MIR laser to return to the core with up to ~300eV in energy. Inelastic scattering of returning electrons impinging on their parent ion results in impact ionization, producing up to the 6th charge state in xenon. Scaling the impact ionization cross section by the electron return energy distribution and wavepacket spread yields excellent agreement with the observed ionization ratios. Elastic scattering of the returning electrons provides information about the structure of the parent ion, as the differential cross section can be extracted from the experimental photoelectron angular distribution. HHG in atomic gases occurs with low conversion efficiency. The advantages of a MIR laser system are used to study HHG in liquid and solid samples. The long wavelength makes possible the first demonstration of high order harmonics from the bulk of a crystalline solid. Harmonics generated in liquids appear perturbative in nature, while those generated in a crystal are highly nonperturbative. The high order harmonics yield information about the strong field response of the crystal's band structure. The use of MIR wavelengths allows the observation of new strong field phenomena. As all of the above methods are applicable to molecules as well as atoms, MIR studies have a strong impact on understanding the interaction between light and matter.
Download or read book Atoms and Clusters in Strong Laser Fields written by Tatiana Marchenko and published by . This book was released on 2008 with total page 187 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ultrafast Mid infrared Laser solid Interactions written by Kevin Thomas Werner and published by . This book was released on 2019 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Resonant Interactions in Strong Field Laser Physics written by Seth Camp and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Interaction of Mid infrared Parametric Waves in Laser Plasmas written by Rashid A. Ganeev and published by . This book was released on 2017 with total page 284 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."--Publisher's website.
Download or read book Laser Induced Damage in Optical Materials written by and published by . This book was released on 2007 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nanoscale Semiconductor Lasers written by Cunzhu Tong and published by Elsevier. This book was released on 2019-08-06 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanoscale Semiconductor Lasers focuses on specific issues relating to laser nanomaterials and their use in laser technology. The book presents both fundamental theory and a thorough overview of the diverse range of applications that have been developed using laser technology based on novel nanostructures and nanomaterials. Technologies covered include nanocavity lasers, carbon dot lasers, 2D material lasers, plasmonic lasers, spasers, quantum dot lasers, quantum dash and nanowire lasers. Each chapter outlines the fundamentals of the topic and examines material and optical properties set alongside device properties, challenges, issues and trends. Dealing with a scope of materials from organic to carbon nanostructures and nanowires to semiconductor quantum dots, this book will be of interest to graduate students, researchers and scientific professionals in a wide range of fields relating to laser development and semiconductor technologies. Provides an overview of the active field of nanostructured lasers, illustrating the latest topics and applications Demonstrates how to connect different classes of material to specific applications Gives an overview of several approaches to confine and control light emission and amplification using nanostructured materials and nano-scale cavities
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Strong Metal support Interactions written by R. T. K. Baker and published by . This book was released on 1986 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Attosecond Nanophysics written by Peter Hommelhoff and published by John Wiley & Sons. This book was released on 2015-03-09 with total page 392 pages. Available in PDF, EPUB and Kindle. Book excerpt: Die Autoren geben einen tiefen wie auch umfassenden Überblick über die aktuelle Forschung im Bereich der Attosekunden-Nanophysik, d.h. einem Gebiet der nanoskaligen Festkörpersysteme und der natürlichen Zeitskala von Elektronenbewegungen.
Download or read book Glass Nanocomposites written by Basudeb Karmakar and published by William Andrew. This book was released on 2016-01-19 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: Glass Nanocomposites: Synthesis, Properties and Applications provides the latest information on a rapidly growing field of specialized materials, bringing light to new research findings that include a growing number of technologies and applications. With this growth, a new need for deep understanding of the synthesis methods, composite structure, processing and application of glass nanocomposites has emerged. In the book, world renowned experts in the field, Professors Karmakar, Rademann, and Stepanov, fill the knowledge gap, building a bridge between the areas of nanoscience, photonics, and glass technology. The book covers the fundamentals, synthesis, processing, material properties, structure property correlation, interpretation thereof, characterization, and a wide range of applications of glass nanocomposites in many different devices and branches of technology. Recent developments and future directions of all types of glass nanocomposites, such as metal-glasses (e.g., metal nanowire composites, nanoglass-mesoporous silica composites), semiconductor-glass and ceramic-glass nanocomposites, as well as oxide and non-oxide glasses, are also covered in great depth. Each chapter is logically structured in order to increase coherence, with each including question sets as exercises for a deeper understanding of the text. Provides comprehensive and up-to-date knowledge and literature review for both the oxide and non-oxide glass nanocomposites (i.e., practically all types of glass nanocomposites) Reviews a wide range of synthesis types, properties, characterization, and applications of diverse types of glass nanocomposites Presents future directions of glass nanocomposites for researchers and engineers, as well as question sets for use in university courses
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
