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Towards atomic unit pulse duration by polarization-controlled few-cycle pulses

2009; IOP Publishing; Volume: 42; Issue: 13 Linguagem: Inglês

10.1088/0953-4075/42/13/134005

1361-6455

G. Sansone, Giorgio Ferrari, C. Vozzi, Francesca Calegari, S. Stagira, M. Nisoli,

Laser-Plasma Interactions and Diagnostics

We demonstrate the generation of broadband extreme ultraviolet (XUV) continua by high order harmonic generation in neon using carrier-envelope phase (CEP) stabilized, few-cycle pulses with a time-dependent polarization. The XUV spectra can support isolated attosecond pulses with a duration of about 50 as, opening the possibility of achieving time resolution close to the atomic unit of time. A theoretical model that calculates the spectral and temporal characteristics of the XUV radiation emitted by a single atom is used to interpret the CEP dependence of the harmonic structures.