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

2005; IOP Publishing; Volume: 38; Issue: 22 Linguagem: Inglês

10.1088/0953-4075/38/22/l01

1361-6455

O Guyétand, Mathieu Gisselbrecht, A. Huetz, P Agostini, Richard Taïeb, V Véniard, A. Maquet, Laura Antonucci, Olga Boyko, C. Valentin, D. Douillet,

Laser-Plasma Interactions and Diagnostics

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.