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Letter

Nature Physics 5, 124–128 (1 February 2009) | doi:10.1038/nphys1155

Attosecond phase locking of harmonics emitted from laser-produced plasmas

Y. Nomura , R. H|[ouml]|rlein , P. Tzallas , B. Dromey , S. Rykovanov , Zs. Major , J. Osterhoff , S. Karsch , L. Veisz , M. Zepf , D. Charalambidis , F. Krausz & G. D. Tsakiris

Laser-driven coherent extreme-ultraviolet (XUV) sources provide pulses lasting a few hundred attoseconds, enabling real-time access to dynamic changes of the electronic structure of matter, the fastest processes outside the atomic nucleus. These pulses, however, are typically rather weak.