@article{419, keywords = {non-Palaiseau, paper}, author = {O Guyetand and M Gisselbrecht and A Huetz and P Agostini and Richard Taïeb and Valérie Véniard and Alfred Maquet and L Antonucci and O Boyko and C Valentin and D Douillet}, title = {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 run 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 degrees lobes which depend on the relative IR-XUV phase. Application to the characterization of attosecond pulses is suggested.}, year = {2005}, journal = {JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS}, volume = {38}, number = {22}, pages = {L357-L363}, month = {NOV 28}, issn = {0953-4075}, doi = {10.1088/0953-4075/38/22/L01}, }