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Showing 1 to 20 of 23 for “"HHG"”.

  1. Tabletop coherent extreme ultraviolet and soft X-ray sources based on high harmonic generation

    Lai, Chien-Jen, Ph. D. Massachusetts Institute of TechnologyMassachusetts Institute of Technology2014

    High harmonic generation (HHG) is a fascinating strong-field physics phenomenon that occurs when a laser pulse with a moderate intensity interacts with atoms and partially ionizes the atoms. A series of harmonics are generated at similar efficiencies and extend to a few tenth, even thousandth, …

    mit Repository record

  2. High harmonic generation and attosecond dynamics in small organic molecules and biomolecules

    Mulholland, Peter PhilipQueen's University Belfast2019

    … of ionization and high harmonic generation (HHG) in a number of small molecules, using the EDAMAME code, which combines a TDDFT description of electronic dynamics with a classical treatment of ionic dynamics. The work is divided into two main areas.<br/><br/> In the first area, we study the …

    qu-belfast Repository record

  3. Extreme ultraviolet polarization optics for polarimetry of structured high harmonics

    Westlake, Nathaniel MorganColorado School of Mines. Arthur Lakes Library2023

    High Harmonic Generation (HHG) is a leading way to generate table-top coherent extreme ultraviolet (EUV) and attosecond pulses. Polarization characterization in this spectral range is important to understand the phenomena of HHG and quantify the light used for experiments. Furthermore, polarization …

    colo-mines Repository record

  4. Modelling of capillary high harmonic generation

    Rogers, Edward Thomas FossUniversity of Southampton2008

    High harmonic generation (HHG) is now an accepted method for laboratory based generation of XUV and soft x-ray light. HHG produces pulses that are highly coherent, with a pulse length in the femtosecond or attosecond timescales. To predict the XUV output from an HHG experiment, both the emission …

    soton Repository record

  5. Limits of High Harmonic Generation conversion efficiency

    Gkortsas, Vasileios-MariosMassachusetts Institute of Technology2013

    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 …

    mit Repository record

  6. Limits of long wavelength High Harmonic Generation

    Bhardwaj, SiddharthMassachusetts Institute of Technology2010

    … driver pulses for High Harmonic Generation (HHG). The advantage of longer wavelengths is that the cut-off of the harmonic spectrum can be increased without the need for large electric fields. Large electric field is undesirable because it leads to large plasma generation which reduces …

    mit Repository record

  7. High harmonic generation by short laser pulses: time-frequency behavior and applications to attophysics

    Murakami, MitsukoPhysics and Astronomy2022

    High harmonic generation (HHG) is a process in which noble gas atoms excited by an intense laser field at frequency ω<sub>1</sub> emit radiation of higher frequencies that are odd integer multiples of ω<sub>1</sub>. Driven by an infrared laser, high harmonic radiation can span from the optical into …

    lsu-thes Repository record

  8. Scaling and Gating Attosecond Pulse Generation

    Heyl, ChristophAtomic Physics, Department of Physics, Lund University2014

    High-order harmonic generation (HHG) provides the basis for attosecond light sources delivering coherent pulses in the extreme ultraviolet spectral region. Such light sources are employed for a variety of applications within imaging, attosecond spectroscopy, and high-precision frequency metrology. …

    lund Repository record

  9. Development and spatio-spectral mapping of a capillary high harmonic source

    Praeger, MatthewUniversity of Southampton2008

    … of a capillary based High Harmonic Generation (HHG) system. Using this system a coherent beam of soft x-rays is generated, studied and applied. A series of experiments was then undertaken in order to deepen our knowledge of the HHG process and to optimise the performance of the source. Notable …

    soton Repository record

  10. High intensity femtosecond enhancement cavities

    Abram, GilbertoMassachusetts Institute of Technology2009

    … radiation via high harmonic generation (HHG) in rare gases, light intensities in excess of 1014 W/cm 2 are required. Usually such high intensity are obtained by parametric amplification of laser pulses, which in turn reduces the pulse repetition rate to a few kHz. Given that the HHG …

    mit Repository record

  11. Table-top XUV nanoscope

    Grant-Jacob, JamesUniversity of Southampton2011

    … can be produced via high harmonic generation (HHG) by focusing a highly intense ultrashort laser pulse into gas. In order to obtain high flux XUV radiation suitable for CDI, various generation conditions are explored. By observing the fluorescence from an argon gas jet to position the laser …

    soton Repository record

  12. High-energy sub-cycle optical waveform synthesizer

    Huang, Shu-Wei, Ph. D. Massachusetts Institute of TechnologyMassachusetts Institute of Technology2012

    … phenomena such as high-harmonic generation (HHG) and strong-field ionization. Further investigation and control of these physical processes ask for the capability of waveform shaping on sub-cycle time scales, which requires a fully phase-controlled multiple-octave-spanning spectrum. To date, …

    mit Repository record

  13. Atomare Prozesse in starken Laserfeldern

    Grasbon, Jan FelixLudwig-Maximilians-Universität

    … hoher Harmonischer (high harmonic generation, HHG). Dabei emittieren die Atome Strahlung mit Photonenenergien, die einem Vielfachen der Energie der eingestrahlten Photonen entsprechen. Aufgrund der Inversionssymmetrie werden im Gas nur die Harmonischen ungerader Ordnung erzeugt. HHG kann durch …

    lmu-germany Repository record

  14. Atoms in intense ultrashort laser pulses and the absolute phase

    Lindner, FabrizioLudwig-Maximilians-Universität

    … (``high-order harmonic generation'', HHG) und der Ionisation über Zustände im Kontinuum (``above-threshold ionization'', ATI). Besonders letzterer Effekt wird detailliert in Verbindung mit der Wechselwirkung mit Laserpulsen von nur wenigen Zyklen Länge untersucht. Während es heutzutage …

    lmu-germany Repository record

  15. PROBING BAND MAGNETISM IN DIFFERENT DIMENSIONS: ENERGY, SPIN AND TIME-RESOLVED STUDIES

    DE VITA, ALESSANDROUniversità degli Studi di Milano2022

    … and EUV ultrashort pulses (tabletop lasers and HHG at NFFA-SPRINT laboratory) and soft X-ray synchrotron light (at Elettra, Diamond and ESRF synchrotron light sources). I used photoemission as the main tool in my investigation, supplementing my results with absorption spectroscopy. I focused on …

    milano Repository record

  16. Ultraschnelle zeitaufgelöste Absorptionsspektroskopie im weichen Röntgenbereich

    Seres, EnikõUniversität Würzburg

    … oder die hoher Harmonische Erzeugung (HHG). Die Plasmaquellen erzeugen im keV Energiebereich Röntgenphotonen – aber nur mit einer Pulsdauer von einigen 100fs. HHG ist hingegen eine interessante Alternative, die Pulse mit einer Dauer im Attosekundenbereich erzeugen kann. Allerdings war …

    wurz-thes Repository record

  17. XUV probing of warm dense matter

    Hyland, CormacQueen's University Belfast2021

    … was then probed using an XUV beam generated by HHG from a 1.5ps optical laser, with photon energies of 21eV, 26eV and 31eV. This XUV beam propagated to a grating spectrometer, which allowed the opacity of each sample foil to be measured at multiple photon energies simultaneously. A modelling …

    qu-belfast Repository record

  18. The femtosecond m-edge approach to the photodynamics of iron(II) complexes

    Zhang, KailiUniversity of Illinois at Urbana-Champaign2020

    … particularly via high-harmonic generation (HHG), allow short-lived states to be examined with X-ray XAS. Despite of these favorable characteristics, ultrafast soft X-ray or XUV absorption spectroscopy has seldom been applied to study molecular coordination complexes of 1st-row transition …

    uiuc Repository record

  19. Towards High-Flux Isolated Attosecond Pulses with a 200 TW CPA

    Cunningham, Eric

    … for driving high-harmonic generation (HHG). With generalized double optical gating (GDOG), isolated attosecond pulses can be generated with multi-cycle laser systems, wherein the pulse energy can be boosted more easily than in the few-cycle laser systems required by other gating …

    ucf

  20. Clinical Outcome and Prognostic Factors of Acute Symptomatic Intracranial Vertebrobasilar Artery Dissection

    김, 병문2011

    … 0.99; p=0.014), pre-treatment Hunt & Hess grade (HHG) 4 or 5 (RR, 11.778; 95% CI, 1.822 ？ 76.134; power, 0.97; p=0.01), and PICA origin involvement (RR, 4.362; 95% CI, 1.054 ？ 19.431; power, 0.51 p=0.042) were independent predictors of unfavorable outcomes. In conclusion, clinical outcome of …

    ajou Repository record

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