In situ spatial mapping of Gouy phase slip for high-detail attosecond pump-probe measurements

Niranjan Shivaram, Adam Roberts, Lei Xu, Arvinder Sandhu

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

Attosecond pump-probe experiments routinely utilize extreme ultraviolet (XUV) and IR fields, with relative phase being the variable parameter. However, the Gouy phase slip between the focused IR and XUV pulses inevitably leads to a certain amount of phase averaging and loss of accuracy. By using ion imaging, we establish a one-to-one mapping between the local phase slip and the spatial coordinates of the focal volume, thus performing in situ characterization of the Gouy phase of a complex beam and its role in ionization of He and Xe. We demonstrate that spatially discriminated ion imaging enhances the contrast of a phase-dependent XUV + IR ionization signal. We utilize our technique to unmask a weak ionization asymmetry, thus opening pathways for further high-precision attosecond studies.

Original languageEnglish (US)
Pages (from-to)3312-3314
Number of pages3
JournalOptics letters
Volume35
Issue number20
DOIs
StatePublished - Oct 15 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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