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

Dahlström, Jan Marcus LU ; Pabst, Stefan and Lindroth, Eva (2017) In Journal of Optics (United Kingdom) 19(11).
Abstract

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 (Pabst and Dahlström Phys. Rev. A 94 13411 (2016)). 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... (More)

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 (Pabst and Dahlström Phys. Rev. A 94 13411 (2016)). 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 -π/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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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
ATAS, attosecond, continuum transition, pulse characterization, transient absorption
in
Journal of Optics (United Kingdom)
volume
19
issue
11
publisher
IOP Publishing
external identifiers
  • scopus:85032840389
  • wos:000413318300001
ISSN
2040-8978
DOI
10.1088/2040-8986/aa8a93
language
English
LU publication?
yes
id
c8280a11-0188-4462-adf3-949d6096cb2e
date added to LUP
2017-11-15 08:21:38
date last changed
2018-03-25 04:41:03
@article{c8280a11-0188-4462-adf3-949d6096cb2e,
  abstract     = {<p>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 (Pabst and Dahlström Phys. Rev. A 94 13411 (2016)). 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 -π/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.</p>},
  articleno    = {114004},
  author       = {Dahlström, Jan Marcus and Pabst, Stefan and Lindroth, Eva},
  issn         = {2040-8978},
  keyword      = {ATAS,attosecond,continuum transition,pulse characterization,transient absorption},
  language     = {eng},
  month        = {10},
  number       = {11},
  publisher    = {IOP Publishing},
  series       = {Journal of Optics (United Kingdom)},
  title        = {Attosecond transient absorption of a bound wave packet coupled to a smooth continuum},
  url          = {http://dx.doi.org/10.1088/2040-8986/aa8a93},
  volume       = {19},
  year         = {2017},
}