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High Order Harmonic Generation With Structured Beams

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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 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.

High Harmonic Generation With Laguerre Gaussian Beams

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Author : Willi Paufler
language : de
Publisher:
Release Date : 2020*

High Harmonic Generation With Laguerre Gaussian Beams written by Willi Paufler and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020* with categories.

High-harmonic generation is a versatile process, for one thing, useful to explore the structure of atoms or molecules during the generation itself and apart from that a source of bright, short, coherent extreme ultraviolet radiation. Thereby the harmonic radiation can be controlled by the shape of the driving laser with respect to its polarization or frequencies. Recent advances show that Laguerre-Gaussian beams, which carry in addition to their spin also orbital angular momentum, can be utilized for high-harmonic generation. In this thesis, we analyze high-harmonic generation with Laguerre-Gaussian beams in the framework of the strong-field approximation and show that this requires both the interaction of a single atom with the driving laser and the macroscopic superposition of all single atom contributions. We first investigate high-harmonic generation with linearly polarized Laguerre-Gaussian beams. There, we show how the orbital angular momentum of the driving laser is transferred to the generated harmonics. Here, we developed vivid photon diagrams to explain the conservation of orbital angular momentum. We then consider phase matching of the generated radiation in order to increase the conversion efficiency. In particular, we analyze the coherence length at different positions in the generating beam. Furthermore, we investigate high-harmonic generation with a pair of counter-rotating circularly polarized Laguerre-Gaussian beams. Here, we derive selection rules that take account of the conservation of energy, spin and orbital angular momentum. In addition, we show that the orbital angular momentum of the generated harmonics can be precisely controlled by the orbital angular momentum of the driving beam.

Generation Of Spatio Temporal Structured High Order Harmonics

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Author : Björn Minneker
language : de
Publisher:
Release Date : 2023*

Generation Of Spatio Temporal Structured High Order Harmonics written by Björn Minneker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023* with categories.

Strong laser fields are essential for exploring laser-atom dynamics in modern physics. High-order harmonic generation (HHG) represents a prominent strong-field process in which an ionized electron accelerates with the electric field of an incident laser and subsequently recombines with its parent ion. The accelerated electron eventually emits a photon within the recombination process, which yields high-order harmonic radiation at the macroscopic scale. Recent advances in laser technology enable the generation of intense mid-infrared laser fields. These new laser sources extended the parameter range of HHG significantly toward the weakly relativistic regime in which the magnetic field of the incident laser field contributes to the process. This dissertation provides a theoretical model of HHG, which is a formal extension of the well-known strong-field approximation toward the weakly relativistic regime. Generally, the model considers arbitrarily spatially structured light fields, in contrast to current approaches, and therefore provides the opportunity to investigate twisted light beams within the weakly relativistic regime. The developed model explicitly considers an elliptically polarized plane wave laser beam as an example. In addition, more sophisticated laser fields are considered and briefly discussed afterward. In addition, this dissertation investigates phase matching in the context of HHG, which is afflicted with a low conversion efficiency of less than 0.1 %. Finding suitable sets of external parameters under which the conversion efficiency is respectively high is therefore of substantial interest to the strong-field community. An analytic expression of the critical intensity is derived that fulfills the phase-matching condition for an arbitrary set of initial parameters. The approach is limited to hydrogen-like noble gases and linearly polarized Gaussian laser pulses with arbitrary laser field parameters that incorporate the commonly utilized configurations. The analytical error compared to numerical computations is less than 1 %, while the computation time improves by four to six orders of magnitude.

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.