Propagation Dynamics And High Harmonic Generation Using High Contrast Ultrashort Laser Pulses
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Propagation Dynamics And High Harmonic Generation Using High Contrast Ultrashort Laser Pulses
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Author : Anna Lena Giesecke
language : en
Publisher:
Release Date : 2013
Propagation Dynamics And High Harmonic Generation Using High Contrast Ultrashort Laser Pulses written by Anna Lena Giesecke 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.
Adaptive Control Of Ultrashort Laser Pulses For High Harmonic Generation
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Author : Dominik Walter
language : en
Publisher:
Release Date : 2006
Adaptive Control Of Ultrashort Laser Pulses For High Harmonic Generation written by Dominik Walter 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.
Coherence And Ultrashort Pulse Laser Emission
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Author : F. J. Duarte
language : en
Publisher: BoD – Books on Demand
Release Date : 2010-12-30
Coherence And Ultrashort Pulse Laser Emission written by F. J. Duarte 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 2010-12-30 with Technology & Engineering categories.
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.
Adaptive Control Of Ultrashort Laser Pulses For High Harmonic Generation
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Author : Dominik Walter
language : en
Publisher:
Release Date : 2007
Adaptive Control Of Ultrashort Laser Pulses For High Harmonic Generation written by Dominik Walter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Adaptive Control Of Ultrashort Laser Pulses For High Harmonic Generation
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Author :
language : en
Publisher:
Release Date : 2007
Adaptive Control Of Ultrashort Laser Pulses For High Harmonic Generation written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
Enhanced Harmonic Generation With Ultra Short Laser Pulses
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Author : Ekaterina V. Sergan
language : en
Publisher:
Release Date : 2018
Enhanced Harmonic Generation With Ultra Short Laser Pulses written by Ekaterina V. Sergan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with Bessel functions categories.
Table top short-pulsed UV lasers are coveted for their usefulness in time-resolved studies of molecular dynamics. However, current wave-mixing and harmonic generation techniques using crystals fail to preserve the short pulse unless the crystal is made thin, thus limiting the conversion efficiency. The alternative is to focus the fundamental beam into a gas, but the phase shift accumulated by a Gaussian beam as it propagates through the focus leads to destructive interference of the generated harmonics. This work presents two methods to alleviate this issue through the use of a semi-infinite geometry for third harmonic generation. The first method involves placing a metal septum at the waist such that the laser drills a small pinhole, which in turn disrupts the beam after the waist. The second method uses a very thin septum as a separator for two gases: one with a large third order susceptibility (before the focus), and the other with a small susceptibility (after the focus). Both methods inhibit harmonic generation immediately after the beam waist. Experiments with third harmonic generation lead to increased conversion efficiency and better mode quality, and had the appropriate perturbative behavior. Simulations supported the experimental results and were used to explore limitations on generation. The techniques were extended to fifth harmonic generation. Although an improved spectrum was observed, increased conversion efficiency was not observed in the experiment. Moreover, simulations indicated that fifth harmonic light production is due to wave-mixing, not generation. Finally, simulations with Bessel-like beams are explored as an alternative method for future experiments.
Improvements For Generating High Order Harmonics And Attosecond Pulses With Ultrashort Laser Fields
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Author : Dian Peng
language : en
Publisher:
Release Date : 2019
Improvements For Generating High Order Harmonics And Attosecond Pulses With Ultrashort Laser Fields written by Dian Peng and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Laser pulses, Ultrashort categories.
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.
Propagation Of High Intensity Ultrashort Laser Pulses In Plasmas By Alan Sullivan
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Author : Alan Sullivan
language : en
Publisher:
Release Date : 1993
Propagation Of High Intensity Ultrashort Laser Pulses In Plasmas By Alan Sullivan written by Alan Sullivan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
The Dependence On Initial Beam Conditions Of The Propagation Of Ultrashort Laser Pulses
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Author : Samuel Schrauth
language : en
Publisher:
Release Date : 2015
The Dependence On Initial Beam Conditions Of The Propagation Of Ultrashort Laser Pulses written by Samuel Schrauth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
This thesis presents the nonlinear propagation dynamics in isotropic media. The influence of initial conditions on the propagation dynamics is considered. Three different instances are considered. We experimentally and numerically study the influence the temporal profile of a laser pulse has on the propagation and collapse dynamics when propagating in different group velocity dispersion regimes. We are interested in the spatio-temporal collapse dynamics of super-Gaussian pulses in this regime. We find that with a super-Gaussian pulse, we see pulsesplitting in this regime. We numerically study how the transverse beam profile effects the propagation in waveguide structures, both step-index fibers and hollow metallic waveguides. We are interested in modes that are necklace beams, with the possibility of application for highpower fiber lasers and amplifiers. We find that there is a benefit in the power threshold for collapse, but that is depends strongly on exciting the desired mode. Finally, we experimentally study the propagation of high power beams, which interact due to the Kerr nonlinearity. The main interest is in the propagation under conditions in which they exhibit spiral motion. We see large rotation of about 40 degrees when the collapsing beams are interacting.
Optimization Of High Order Harmonic Generation Using An Ultrashort Pulse High Intensity Laser
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Author : Bernd Schütte
language : en
Publisher:
Release Date : 2006
Optimization Of High Order Harmonic Generation Using An Ultrashort Pulse High Intensity Laser written by Bernd Schütte 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.