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A: Fachverband Atomphysik

A 32: Attosecond Physics III

A 32.4: Talk

Thursday, March 5, 2009, 17:45–18:00, VMP 6 HS-E

Higher-Order Effects in Attosecond Pulse Train Measurements — •Marko Swoboda¹, Thierry Ruchon², J. Marcus Dahlström¹, Johan Mauritsson¹, and Anne L'Huillier¹ — ¹Department of Physics, Lund University, P.O. Box 118, 221 00 Lund, Sweden — ²Centre d'Etudes de Saclay, CEA/DRECAM/SPAM, 91191 Gif-sur-Yvette, France

Multiphoton processes are at the heart of most attosecond pulse characterization schemes. Due to the low availability of intense attosecond pulse sources, the combination of a single or train of attosecond pulses with a probing infrared field in an interferometric setup is the one most often employed. Using this scheme to characterize attosecond pulse trains generated in Argon, we study the influence of the probe field intensity on the measured phase of the final photo electron wave packet. We find that in the transition from RABBITT-like intensities to the range of attosecond streaking higher and higher orders of perturbation and photon numbers contribute to the final photo electron state until the classical limit is reached. A Fourier-type analysis attributes the each individual frequency to an additional perturbative order.