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Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 13: Ultrashort Laser Pulses: Generation II

Q 13.4: Vortrag

Montag, 8. März 2010, 17:15–17:30, F 342

High Order Harmonic Enhancement Mediated by the Carrier-Envelope Phase — •J. Biegert1,6, D. Faccio1,2, C. Serrat1,3, J.M. Cela4, A. Farres4, and P. Di Trapani2,51ICFO-Institut de Ciènces Fotòniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain — 2CNISM and Dept. of Physics and Mathematics, Università dell’Insubria, IT-22100 Como, Italy — 3DTDI Universitat de Vic, 08500 Vic, Barcelona, Spain — 4CASE Barcelona Supercomputing Center, 08034 Barcelona, Spain — 5Virtual Institute for Nonlinear Optics, Centro di Cultura Scientifica Alessandro Volta, 22100 Como, Italy — 6ICREA Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain

A two decade enhancement in the conversion efficiency of high harmonic generation is observed and interpreted as the consequence of nonlinearly induced modulation in the phase mismatch between the generating dipole and the propagated harmonics.

We propose a novel technique to improve the efficiency of HHG with few-cycle pulses by controlling their Carrier-Envelope-Phase (CEP) so as to achieve a periodic modulation of the pump peak intensity along with propagation. We have performed numerical simulations based on a three dimensional propagation model in cylindrical coordinates using the nonadiabatic Strong Field Approximation (SFA) to calculate the atomic response. The harmonic grows linearly and after some propagation reaches a value roughly two orders of magnitude higher than the non-modulated, phase-mismatched case.

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