On the feasibility of performing non-linear autocorrelation with attosecond pulse trains |
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| Authors: | N.A.?Papadogiannis,L.A.A.?Nikolopoulos,D.?Charalambidis,G.D.?Tsakiris author-information" > author-information__contact u-icon-before" > mailto:tsakiris@mpq.mpg.de" title=" tsakiris@mpq.mpg.de" itemprop=" email" data-track=" click" data-track-action=" Email author" data-track-label=" " >Email author,P.?Tzallas,K.?Witte |
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| Affiliation: | 1.Institute of Electronic Structure and Laser, Laser and Applications Division,Foundation for Research and Technology – Hellas,Heraklion,Greece;2.Department of Physics,University of Crete,Voutes-Heraklion,Greece;3.Max-Planck-Institut für Quantenoptik,Garching,Germany |
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| Abstract: | We present experimental results in which a second-order effect, namely two-photon ionization of atomic He induced by a superposition of harmonics, is observed. The harmonics are generated in a Xe gas-jet using a 790-nm 10-Hz femtosecond Ti:sapphire laser and are subsequently focused into a He gas-jet with a Kirkpatrick–Baez arrangement. The superposition is formed by using a thin In filter and it comprises the 7th to 13th harmonics. Solving the time-dependent Schrödinger equation for He in a polychromatic laser field, the He + ion yield is calculated as a function of the total XUV intensity. Using the calculated yield and taking into account the focusing and transmission properties of the arrangement, the number of He + ions produced per laser pulse is estimated and is found to be in reasonable agreement with its measured value. The total number of ions produced non-resonantly follows a nearly quadratic dependence on the harmonic intensity, thus establishing the feasibility of a second-order auto-correlation measurement of the superposition of harmonics, i.e., of a direct temporal characterization of attosecond pulse trains. |
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