Multicolour above-threshold ionization of helium: quantum interference effects in angular distributions

Abstract : Energy- and angle-resolved photoionization spectra of He irradiated by linearly polarized intense 810 nm laser radiation and several of its XUV odd harmonics are investigated. The angular distribution of the odd-order peaks, produced by single-photon ionization by one harmonic, is, surprisingly, broadened by the IR field. The even-order ones, due to two-colour, two-photon ionization, show at 90° lobes which depend on the relative IR–XUV phase. Application to the characterization of attosecond pulses is suggested.
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Submitted on : Monday, March 7, 2011 - 12:26:46 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:02 AM

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O. Guyetand, M. Gisselbrecht, A. Huetz, P. Agostini, R. Taïeb, et al.. Multicolour above-threshold ionization of helium: quantum interference effects in angular distributions. Journal of Physics B: Atomic, Molecular and Optical Physics, IOP Publishing, 2005, 38 (22), pp.L357-L363. ⟨10.1088/0953-4075/38/22/L01⟩. ⟨hal-00574172⟩

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