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Your search keyword '"Witting, Tobias"' showing total 2 results
Start Over Author "Witting, Tobias" Topic harmonic generation
2 results on '"Witting, Tobias"'

1. Phase cycling of extreme ultraviolet pulse sequences generated in rare gases.

Author

Wituschek, Andreas, Kornilov, Oleg, Witting, Tobias, Maikowski, Laura, Stienkemeier, Frank, Vrakking, Marc J J, and Bruder, Lukas

Subjects
NOBLE gases, HARMONIC generation, ARGON, SPECTRUM analysis, KRYPTON, WAVELENGTHS
Abstract

The development of schemes for coherent nonlinear time-domain spectroscopy in the extreme-ultraviolet regime (XUV) has so far been impeded by experimental difficulties that arise at these short wavelengths. In this work we present a novel experimental approach, which facilitates the timing control and phase cycling of XUV pulse sequences produced by harmonic generation in rare gases. The method is demonstrated for the generation and high spectral resolution characterization of narrow-bandwidth harmonics (≈14 eV) in argon and krypton. Our technique simultaneously provides high phase stability and a pathway-selective detection scheme for nonlinear signals—both necessary prerequisites for all types of coherent nonlinear spectroscopy. [ABSTRACT FROM AUTHOR]

Published
2020
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2. Prediction of attosecond light pulses in the VUV range in a high-order-harmonic-generation regime

Author

Henkel, Jost, Witting, Tobias, Fabris, Davide, Lein, Manfred, Knight, Peter L., Tisch, John W.G., and Marangos, Jonathan P.

Subjects
Harmonic generation, Light pulse generators, Linearly polarized lasers, High order harmonic generation, Short laser pulse, Vacuum ultraviolet energies, Polarization, Light transmission, Physics::Atomic and Molecular Clusters, Polarization gating, ddc:530, Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik, Physics::Atomic Physics, Atomic transition, Laser pulses, Field polarization, Attosecond light pulse
Abstract

Attosecond light pulses within the vacuum ultraviolet (VUV) energy range are predicted by solving the time-dependent Schrödinger equation (TDSE) for a model neon atom in short laser pulses of different field polarization states. We compare high-order harmonic generation in linearly polarized laser pulses to the method of polarization gating and find attosecond pulses that approach the Fourier limit of 700 as given by an indium filter, spectrally centered at 15 eV. At such low energies, harmonic generation has low sensitivity to ellipticity, which enables the generation of elliptically polarized attosecond pulses. We also show that emission at the atomic transition energies is strongly damped by including intensity averaging. © 2013 American Physical Society. EPSRC/EP/I032517/1 EU Marie Curie Initial Training Network/FASTQUAST DFG

Published
2013

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