Attosecond transient absorption of a bound wave packet coupled to a smooth continuum

Dahlström, Jan Marcus; Pabst, Stefan; Lindroth, Eva

doi:10.1088/2040-8986/aa8a93

Title: Attosecond transient absorption of a bound wave packet coupled to a smooth continuum

Journal Article · Mon Oct 16 04:00:00 UTC 2017 · Journal of Optics

DOI: https://doi.org/10.1088/2040-8986/aa8a93 · OSTI ID:1410602

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Lund Univ., Lund (Sweden); Stockholm Univ., Stockholm (Sweden)
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
Stockholm Univ., Stockholm (Sweden)

Here, we investigate the possibility of using transient absorption of a coherent bound electron wave packet in hydrogen as an attosecond pulse characterization technique. In a recent work, we have shown that photoionization of such a coherent bound electron wave packet opens up for pulse characterization with unprecedented temporal accuracy—independent of the atomic structure—with maximal photoemission at all kinetic energies given a wave packet with zero relative phase. Here, we perform numerical propagation of the time-dependent Schrödinger equation and analytical calculations based on perturbation theory to show that the energy-resolved maximal absorption of photons from the attosecond pulse does not uniquely occur at a zero relative phase of the initial wave packet. Instead, maximal absorption occurs at different relative wave packet phases, distributed as a non-monotonous function with a smooth $$-\pi /2$$ shift across the central photon energy (given a Fourier-limited Gaussian pulse). Similar results are also found in helium. Our finding is surprising, because it implies that the energy-resolved photoelectrons are not mapped one-to-one with the energy-resolved absorbed photons of the attosecond pulse.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1410602

Journal Information:: Journal of Optics, Journal Name: Journal of Optics Journal Issue: 11 Vol. 19; ISSN 2040-8978

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (4)

Pulse analysis by delayed absorption from a coherently excited atom Dahlström, Jan Marcus; Pabst, Stefan; Lindroth, Eva APL Photonics, Vol. 4, Issue 1 https://doi.org/10.1063/1.5053661	journal	January 2019
Emerging attosecond technologies Mauritsson, Johan; Vampa, Giulio; Vozzi, Caterina Journal of Optics, Vol. 20, Issue 11 https://doi.org/10.1088/2040-8986/aae507	journal	October 2018
Attosecond precision in delay measurements using transient absorption spectroscopy Hartmann, Maximilian; Stooß, Veit; Birk, Paul Optics Letters, Vol. 44, Issue 19 https://doi.org/10.1364/ol.44.004749	journal	January 2019
Pulse analysis by delayed absorption from a coherently excited atom Dahlström, Jan Marcus; Pabst, Stefan; Lindroth, Eva arXiv https://doi.org/10.48550/arxiv.1808.08102	preprint	January 2018

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Title: Attosecond transient absorption of a bound wave packet coupled to a smooth continuum

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