High Harmonic Generation And Applications
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High Harmonic Generation And Applications
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Author : Frederick August Weihe
language : en
Publisher:
Release Date : 2000
High Harmonic Generation And Applications written by Frederick August Weihe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
Phase Matched High Order Harmonic Generation And Application
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Author : Dinh Ba Khuong
language : en
Publisher: Nova Science Publishers
Release Date : 2013
Phase Matched High Order Harmonic Generation And Application written by Dinh Ba Khuong and has been published by Nova Science Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with X-ray lasers categories.
High order harmonic generation (HHG) produced by the interaction of an intense laser pulse and a gas medium can provide a table top scale coherent radiation source in the short wavelength range from the extreme ultraviolet to the soft x-ray region. This book presents a study based on high order harmonic generation in a semi-infinite gas cell. Two novel schemes are presented which have been used to enhance the quality of the HHG source including the conversion efficiency, the coherence, and the cut-off photon energy. This book focuses on the phase matching of the non-linear conversion process which is the main limitation to the quality of the HHG source. In the first scheme, a combination of lens and axicon is used to create a Bessel Gaussian beam instead of only a Gaussian beam and the presence of a new geometrical phase mismatch term is demonstrated. This allows us to compensate for the phase mismatch and thus to enhance the phase matching condition. In the second scheme, the phase matching is controlled by a means of an off-axis beam. When the phase mismatch is varied, mainly due to a change in the dipole phase term, the harmonic emission can be destroyed or enhanced. This technique provides the possibility to generate very high harmonic photon energies.
Efficient High Harmonic Generation Sources For Applications In X Ray Imaging
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Author : Charles Pooley
language : en
Publisher:
Release Date : 2021
Efficient High Harmonic Generation Sources For Applications In X Ray Imaging written by Charles Pooley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
Advances In Solid State Lasers
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Author : Mikhail Grishin
language : en
Publisher: BoD – Books on Demand
Release Date : 2010-02-01
Advances In Solid State Lasers written by Mikhail Grishin and has been published by BoD – Books on Demand this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-02-01 with Technology & Engineering categories.
Invention of the solid-state laser has initiated the beginning of the laser era. Performance of solid-state lasers improved amazingly during five decades. Nowadays, solid-state lasers remain one of the most rapidly developing branches of laser science and become an increasingly important tool for modern technology. This book represents a selection of chapters exhibiting various investigation directions in the field of solid-state lasers and the cutting edge of related applications. The materials are contributed by leading researchers and each chapter represents a comprehensive study reflecting advances in modern laser physics. Considered topics are intended to meet the needs of both specialists in laser system design and those who use laser techniques in fundamental science and applied research. This book is the result of efforts of experts from different countries. I would like to acknowledge the authors for their contribution to the book. I also wish to acknowledge Vedran Kordic for indispensable technical assistance in the book preparation and publishing.
High Harmonic Generation By Short Laser Pulses
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Author : Mitsuko Murakami
language : en
Publisher:
Release Date : 2006
High Harmonic Generation By Short Laser Pulses written by Mitsuko Murakami and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
Generation And Control Of Solid State High Harmonics At The Nanoscale
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Author : Hanzhe Liu
language : en
Publisher:
Release Date : 2019
Generation And Control Of Solid State High Harmonics At The Nanoscale written by Hanzhe Liu and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
High-harmonic generation (HHG) lies at the heart of attosecond science. Since the first experimental observation of HHG in noble gases, extensive theoretical and experimental studies have been performed on HHG from gas phase medium including both noble gases as well as small molecues for the past 30 years, making HHG a valuable tool to probe attosecond dynamics in various physical and chemical systems. A recent new progress in this field is the observation of high harmonics in a crystalline bulk solid reported in the year of 2011. Fundamentally, high-harmonic generation from solids is a spectroscopy technique and understanding the mechanism will allow us to study the fundamental strong light-matter interaction processes happen at femto- and attosecond time scale in the condensed matter phase. In terms of application, observation of high-harmonics in solids such as semiconductors makes it possible to engineer and control the ultrafast strong light-matter interaction at nanoscales by patterning the solids target with subwavelength nanostructures, which could eventually lead to novel compact ultrafast photonic devices operating at extremely short wavelengths. In this thesis, we report a few experiments that reveal the fundamental mechanism responsible for solid-state high-harmonic generation as well as the control of the process at subwavelength scale by applying nanofabrication technology. The first experiment is an optical pump-probe study on HHG from a ZnO bulk crystal. The behavior of the high-harmonics signal generated from a strong probe pulse under a direct band gap linear excitation suggests that a Rabi-type of interband transition plays an important role in high-harmonic generation in solids under the experiment condition. A second experiment is the first demonstration of high-harmonic generation in a two-dimensional material (in this case, monolayer MoS$_{2}$). Based on the measured high-harmonic spectra we suggest that the Berry curvature of the material has important effects when electrons are strongly driven by the excitation field. We further find that the generation process is more efficient from monolayer compared to an equivalent layer in bulk, revealing hints of the correlation effects on the high-harmonic generation process. A third experiment covered in this thesis is to enhance and control high-harmonic generation from an all-dielectric metasurface. The enhancement of high harmonics is a direct result of the enhanced pump field in the metasurface when the device is resonantly excited. The overall harmonic yield from field-enhancing nanostructures is ultimately limited by the laser induced damage of the sample, and this motivates the last work in this thesis. In this work, we demonstrate the guiding of above-gap high harmonics in a slotted waveguide geometry by allowing high harmonics propagating in the vacuum channel with a greatly reduced absorption. Coherent propagation effects are observed, which is otherwise absent in bulk due to strong absorption. With the reduced absorption, we further demonstrate the enhanced high harmonics at high excitation intensities up to the damage threshold of the bulk.
Atoms Solids And Plasmas In Super Intense Laser Fields
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Author : Dimitri Batani
language : en
Publisher: Springer Science & Business Media
Release Date : 2001-09-30
Atoms Solids And Plasmas In Super Intense Laser Fields written by Dimitri Batani and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-09-30 with Science categories.
Proceedings of the 30th Course of the International School of Quantum Electronics on Atoms, Solids and Plasmas in Super-Intense Laser Fields, held 8-14 July, in Erice, Sicily
High Order Harmonic Generation With Structured Beams
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Author : Fanqi Kong
language : en
Publisher:
Release Date : 2019
High Order Harmonic Generation With Structured Beams written by Fanqi Kong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
The generation of high-order harmonics opened an era of attosecond science wherein coherent light bursts are used to probe dynamic processes in matter with a time resolution short enough to resolve the motions of electrons. It enabled the development of extreme ultraviolet (XUV) and X-ray table-top sources with both temporal and spatial coherence, which provides the ability to shape the temporal and spatial structure of the XUV pulses. Scientists developed techniques to control and measure the temporal structure high harmonic emissions. These techniques exploited control of the driving laser pulse in the time domain and facilitated development of more advanced high-harmonic based XUV sources that have greatly impacted ultrafast measurements. In this thesis, I apply techniques to control and measure the spatial structure of high harmonic emissions, and discuss the underlying physics and potential applications of the interaction between spatially structured laser beams and materials. This study exploits the spatial degree of freedom in strong field interaction, which has not been given as much attention as the temporal degree of freedom. I use liquid crystal devices to shape the wave front of a fundamental laser beam to a vortex structure, then imprint this structured wave front onto XUV beams through high harmonic generation. This method provides an alternative to special XUV optics, which can manipulate the wave front of XUV radiation by all optical means. This result also reveals the conservation of orbital angular momentum in this extreme nonlinear wave mixing process. In addition to shaping the wave front, shaping the polarization of the driving beam also allows generation of circularly polarized the XUV radiation using a high harmonic source. This thesis also highlights the interplay between shaping the wave front and polarization in the high harmonic generation process. The topology of the structured beam can be maintained through this extreme nonlinear interaction due to the spin selection rules and spin-orbit conservation. Moreover, this thesis demonstrates an approach to integrate a vector beam into a broadband ultrafast light source and overcome the bandwidth limitation of mode converters. We use this approach to generate a few-cycle structured beam. In the future, this beam will be used to generate a strong ultrafast magnetic impulse in gas and solid targets by driving currents in a loop, which is a valuable tool for the future of magnetic metrology. The novel properties of structured laser beams discussed in this thesis expanded the capabilities of high harmonic based XUV sources and have opened a new field to explore this additional degree of freedom in strong field interactions.
High Order Harmonic Generation In Laser Plasma Plumes
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Author : Rashid A. Ganeev
language : en
Publisher: World Scientific
Release Date : 2013
High Order Harmonic Generation In Laser Plasma Plumes written by Rashid A. Ganeev and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with Science categories.
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.
Limits Of High Harmonic Generation Conversion Efficiency
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Author : Vasileios-Marios Gkortsas
language : en
Publisher:
Release Date : 2013
Limits Of High Harmonic Generation Conversion Efficiency written by Vasileios-Marios Gkortsas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
High Harmonic Generation (HHG) is a fascinating phenomenon from both fundamental and technological point of view. It enables the generation of attosecond pulses and can have applications in EUV lithography and bio-microscopy. HHG can be described by the Three Step Model (TSM), due to the three stages of the process: ionization, propagation and recombination. However, HHG suffers from low efficiencies and a study, which shows the efficiency scaling with laser and material parameters is essential. For a long time experimentalists were using only 800 nm driver pulses from Ti:sapphire lasers. With the advent of new light sources like optical parametric amplifiers, different driving wavelengths became available and thus the scaling of the single atom response versus drive wavelength has attracted a lot of attention. A detailed analysis shows that the efficiency scales with w50 at the cutoff and w60 at the plateau region for a fixed EUV frequency, where w0 is the carrier frequency of the driver pulse. To understand the limitations of such a light source, we have developed a semi-analytic model for the computation of the conversion efficiency into a single harmonic for the plateau and cutoff regions. This model is one-dimensional, uses the TSM for the calculation of the single atom response and takes laser, material parameters and macroscopic effects into account. Closed form expressions for the plateau and cutoff regions are derived and used to calculate efficiencies for 400 and 800 nm driver pulses. The results are compared with experimental ones showing very good agreement. In order to investigate long-wavelength driven HHG efficiency, the 1-D model is extended to three dimensions taking into account spatiotemporal propagation effects, such as plasma defocusing and losses due to electron-neutral inverse bremsstrahlung. These phenomena change the phase matching along propagation, resulting in non-coherent harmonic generation and consequently poor efficiencies. We further study ways to mitigate the effect of plasma defocusing like the use of Supergaussian pulses and the use of Gaussian pulses with larger beam waists. The work presented can help us develop tools for an optimization study of HHG efficiency, in order to make useful EUV sources.