Bulletin of the American Physical Society

{\it Ab initio} calculations of atomic coherence excited by optical pulses: CEP effects and generation of X-ray radiation

Suman S. Dhayal, Yuri V. Rostovtsev

Published Mar 25, 2011• 0 citations

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Bulletin of the American Physical Society

{\it Ab initio} calculations of atomic coherence excited by optical pulses: CEP effects and generation of X-ray radiation

Suman S. Dhayal, Yuri V. Rostovtsev

Published Mar 25, 2011• 0 citations

OpenAlex

Related papers

Atomic and nuclear coherence excited by optical pulses: CEP effects and generation of X-ray and nuclear radiation

Yuri V. Rostovtsev

Frontiers in OpticsJan 1, 20100 citations

Atomic and nuclear coherence excited by optical pulses

Yuri V. Rostovtsev

Bulletin of the American Physical SocietyMay 28, 20100 citations

Coherence effects in the interaction of radiation with atoms

George William Series

Jan 1, 19691 citation

High-order harmonic generation in argon driven by short laser pulses: effects of post-pulse propagation and windowing

Aaron T. Bondy, Klaus Bartschat

We present ab initio calculations using the $R$ -matrix with time dependence (RMT) method for high-order harmonic generation (HHG) in argon in a short, intense pulse regime. The calculations employ a $6$ -cycle $\sin^2$ pulse at $850$ nm with peak intensity $2.3\times 10^{14}$ W/cm $^2$ and, for comparison with the experiment by Guo et al. [J. Phys. B: At. Mol. Opt. Phys. 51, 034006 (2018)], a Gaussian pulse with the same frequency and peak intensity. Both pulse shapes yield the expected harmonic structure in the region above the ionization threshold (approximately $15.82$ eV in $LS$ -coupling). The spectra exhibit strong carrier-envelope-phase (CEP) sensitivity. The energy region leading up to the ionization threshold contains spectral features arising from residual coherent dipole oscillations (free-induction decay) that strongly depend on spectral windowing and the post-pulse propagation time. We show that the HHG spectrum, particularly below the ionization threshold, is a defined quantity that depends on analysis choices rather than being a uniquely determined observable. Comparison between theoretical predictions and experimental observations in this energy regime, therefore, requires explicit specification of these parameters.We present ab initio calculations using the $R$-matrix with time dependence (RMT) method for high-order harmonic generation (HHG) in argon in a short, intense pulse regime. The calculations employ a $6$-cycle $\sin^2$ pulse at $850$ nm with peak intensity $2.3\times 10^{14}$ W/cm$^2$ and, for comparison with the experiment by Guo et al. [J. Phys. B: At. Mol. Opt. Phys. 51, 034006 (2018)], a Gaussian pulse with the same frequency and peak intensity. Both pulse shapes yield the expected harmonic structure in the region above the ionization threshold (approximately $15.82$ eV in $LS$-coupling). The spectra exhibit strong carrier-envelope-phase (CEP) sensitivity. The energy region leading up to the ionization threshold contains spectral features arising from residual coherent dipole oscillations (free-induction decay) that strongly depend on spectral windowing and the post-pulse propagation time. We show that the HHG spectrum, particularly below the ionization threshold, is a defined quantity that depends on analysis choices rather than being a uniquely determined observable. Comparison between theoretical predictions and experimental observations in this energy regime, therefore, requires explicit specification of these parameters.

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Refraction and absorption of x rays by laser-dressed atoms

Christian Buth, Robin Santra, Young, Linda

arXiv:0805.2619Revista Mexicana de FísicaMay 16, 20081 citation

We present ab initio calculations using the

R

-matrix with time dependence (RMT) method for high-order harmonic generation (HHG) in argon in a short, intense pulse regime. The calculations employ a

6

-cycle

\sin^2

pulse at

850

nm with peak intensity

2.3\times 10^{14}

W/cm

^2

and, for comparison with the experiment by Guo et al. [J. Phys. B: At. Mol. Opt. Phys. 51, 034006 (2018)], a Gaussian pulse with the same frequency and peak intensity. Both pulse shapes yield the expected harmonic structure in the region above the ionization threshold (approximately

15.82

eV in

LS

-coupling). The spectra exhibit strong carrier-envelope-phase (CEP) sensitivity. The energy region leading up to the ionization threshold contains spectral features arising from residual coherent dipole oscillations (free-induction decay) that strongly depend on spectral windowing and the post-pulse propagation time. We show that the HHG spectrum, particularly below the ionization threshold, is a defined quantity that depends on analysis choices rather than being a uniquely determined observable. Comparison between theoretical predictions and experimental observations in this energy regime, therefore, requires explicit specification of these parameters.