Düsseldorf 2007 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 17: Attosecond Physics (jointly with Q)

A 17.6: Vortrag

Mittwoch, 21. März 2007, 15:30–15:45, 6G

Heterodyne control of attosecond pulse generation — •Thomas Pfeifer^1,2, Lukas Gallmann^1,2, Mark J. Abel^1,2, Phillip M. Nagel^1,2, Aurélie Jullien^1,2, Daniel M. Neumark^1,2, and Stephen R. Leone^1,2 — ¹Departments of Chemistry and Physics, University of California, Berkeley, CA 94720, USA — ²Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

Adding a weak laser field at a different color to the fundamental in high-order harmonic generation results in a new type of heterodyne mixing in the kinetic energy term of the active electron. Analytical calculations and quantum simulations show that the effect of the weak field is amplified by the strong fundamental laser field that acts as the local oscillator [1]. The photon energies of different attosecond pulses within the produced pulse trains can thus be significantly modified. Two important applications for this phenomenon are the generation of isolated attosecond pulses with multi-cycle driving fields and the shaping of attosecond pulse trains.

Ref.: [1] T. Pfeifer et al., Phys. Rev. Lett. 97, 163901 (2006)