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Dresden 2011 – scientific programme

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A: Fachverband Atomphysik

A 28: Attosecond physics II

A 28.5: Talk

Wednesday, March 16, 2011, 11:45–12:00, BAR 205

Spectrally resolved Maker Fringes in High-Order Harmonic Generation — •Christoph M. Heyl1, Jens Güdde2, Ulrich Höfer2, and Anne L’Huillier11Department of Physics, Lund University, Lund, Sweden — 2Fachbereich Physik und Zentrum fürMaterialwissenschaften, Philipps-Universität, Marburg, Germany

We present theoretical and experimental studies of macroscopic interference effects in high-order harmonic generation (HHG) using 6 µJ, 45 fs laser pulses at 100 kHz repetition rate.

Every harmonic spectrum contains a fingerprint of both, microscopic and macroscopic effects. So far, however, mostly single atom effects have been emphasized. In a series of recent studies interference structures in HHG spectra have been interpreted as due to interferences between long and short electron trajectories which has been called quantum path interference (QPI). Here, we focus on the macroscopic effects and investigate how phase matching affects the harmonic spectrum. We show how the appearance of spectral fringes can be explained in terms of Maker fringes, due to the time dependent coherence length of the long trajectory. We explain further, how these spectral Maker fringes contain direct information about the time dependent phase matching conditions as well as about the intensity dependent phase of the microscopic dipole moment.

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