Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 44: Attosecond physics II
A 44.2: Vortrag
Freitag, 16. März 2012, 11:00–11:15, V57.05
Trajectory interferences in a semi-infinite gas cell — •Stephan M. Teichmann1, Dane R. Austin1, Matteo Clerici2, Antonio Lotti3,4, Daniele Faccio5, Paolo Di Trapani3, Arnaud Couairon4, and Jens Biegert1,6 — 1ICFO-Institut de Ciencies Fotoniques, Castelldefels (Barcelona), Spain — 2INRS-EMT, Université du Québec, Varennes, Canada — 3Università dell’Insurbia,Como, Italy — 4École Polytechnique, Centre National de la Recherche Scientifique, Palaiseau, France — 5Heriot-Watt University, Edinburgh, Scotland — 6ICREA-Institució Catalana de Recerca i Estudis Avançats, Barcelona, Spain
Interferences between different quantum paths in the high harmonic generation (HHG) process offer insight into the interplay between the microscopic and macroscopic responses. Structures in spectrally resolved far-field spectra can be related to quantum path interference (QPI) effects. Here, we study QPI in the very loose focusing regime for the first time in high harmonic radiation generated in a semi-infinite gas cell. We assign the observed structures to interference of trajectories across the transverse plane of the generating field. A simple model based on the stationary phase approximation (SPA) within the strong field approximation (SFA) is used to describe the underlying effects.