K
K. J. Schafer
Researcher at Louisiana State University
Publications - 28
Citations - 788
K. J. Schafer is an academic researcher from Louisiana State University. The author has contributed to research in topics: High harmonic generation & Harmonic. The author has an hindex of 13, co-authored 28 publications receiving 723 citations. Previous affiliations of K. J. Schafer include Lawrence Livermore National Laboratory & National Institute of Standards and Technology.
Papers
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Journal ArticleDOI
Attosecond control of ionization by wave-packet interference.
TL;DR: Calculations that reproduce the experimental results demonstrate that this ionization control results from interference between transiently bound EWPs created by different pulses in the train, allowing the first time, attosecond wave-packet interference in a strongly driven atomic system.
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Model for studies of laser-induced nonlinear processes in molecules.
K. C. Kulander,K. C. Kulander,K. C. Kulander,F. H. Mies,F. H. Mies,F. H. Mies,K. J. Schafer,K. J. Schafer,K. J. Schafer +8 more
TL;DR: It is found that the excitation and ionization dynamics of the molecular ion depend strongly on the laser wavelength, pulse shape, intensity, and particularly on the initial vibrational state of the molecule.
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Measurement and control of the frequency chirp rate of high-order harmonic pulses
Johan Mauritsson,Per Johnsson,Rodrigo Lopez-Martens,Katalin Varjú,W. Kornelis,Jens Biegert,Ursula Keller,Mette B. Gaarde,K. J. Schafer,Anne L'Huillier +9 more
TL;DR: In this article, the authors measured the chirp rate of harmonics 13 to 23 in argon by cross correlation with a 12 femtosecond probe pulse under low ionization conditions.
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Role of Excited States In High-order Harmonic Generation.
Samuel Beaulieu,Samuel Beaulieu,Seth Camp,Dominique Descamps,Antoine Comby,Vincent Wanie,Vincent Wanie,Stéphane Petit,François Légaré,K. J. Schafer,Mette B. Gaarde,F. Catoire,Yann Mairesse +12 more
TL;DR: It is demonstrated that the high-harmonic emission from excited states is temporally delayed by a few femtoseconds compared to the usual harmonics, leading to a strong nonadiabatic spectral redshift.
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Attosecond pulse shaping around a Cooper minimum.
Stephen B. Schoun,Razvan Chirla,J. Wheeler,C. Roedig,Pierre Agostini,Louis F. DiMauro,K. J. Schafer,Mette B. Gaarde +7 more
TL;DR: The reconstructed attosecond bursts that underlie the HHG process show that the derivative of the RDM spectral phase, the group delay, does not have a straightforward interpretation as an emission time, in contrast to the usual attochirp group delay.