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Title: Probing electron delays in above-threshold ionization

Recent experiments have revealed attosecond delays in the emission of electrons from atoms ionized by extreme UV light, offering a glimpse into the ultrafast nature of light-induced electron dynamics. In this work, we extend these measurements to the strong-field above-threshold ionization (ATI) regime, by measuring delays in the photoemission of electrons from argon in the presence of an intense laser field. We probe the ATI process with a weak coherent reference, at half the laser frequency. The interfering ionization signal reveals the relative spectral phase of adjacent ATI channels, with an equivalent resolution of a few attoseconds. These relative delays depend on the strong field, and approach zero at higher intensity. Our phase measurements of ATI electrons show how strong fields alter ionization dynamics in atoms.
Authors:
 [1] ;  [2] ;  [3]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst.; Stanford Univ., CA (United States). Dept. of Physics
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst.
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford PULSE Inst.; Stanford Univ., CA (United States). Dept. of Physics and Dept. of Applied Physics
Publication Date:
Grant/Contract Number:
AC03-76SF00515
Type:
Published Article
Journal Name:
Optica
Additional Journal Information:
Journal Volume: 1; Journal Issue: 6; Journal ID: ISSN 2334-2536
Publisher:
Optical Society of America
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
OSTI Identifier:
1222353
Alternate Identifier(s):
OSTI ID: 1223357