Speaker
Prof.
Julien Beaudoin Bertrand
(Université Laval)
Description
Attosecond Physics is an emerging field at the international level which now provides tabletop attosecond (as=10^-18 s.) light sources extending from the extreme ultraviolet (XUV, 10-100 eV) to X-rays (keV) [1]. This feat opens new avenues in atomic and molecular spectroscopies [2], especially, to perform time-resolved experiments of ultrafast electron dynamics on the unexplored attosecond timescale [3]. I will present the first attosecond pump-probe measurement where an XUV attosecond pulse initiates an Auger decay and where an attosecond broadband optical pulse probes this ultrafast process. Supported by our model, we suggest that the optical probe acts as a gate of the Auger transition, in analogy with the FROG (frequency-resolved optical gating) technique commonly-used for measuring femtosecond laser pulses [4]. We believe this is a universal idea that will prevail in attosecond measurements [5]: I will show how our pump-probe scheme and modeling can reveal few-femtoseconds (atomic) to sub-fs (condensed matter) Auger lifetimes.
[1] T. Popmintchev *et al.*, Nature Photonics 4, 822 (2010).
[2] J. B. Bertrand *et al.*, Nature Physics 9, 174 (2013).
[3] S. R. Leone *et al.*, Nature Photonics 8, 162 (2014).
[4] R. Trebino, FROG, Kluwer Academic Publishers, Boston (2002).
[5] A. Moulet, J.B. Bertrand *et al.*, Okinawa, Ultrafast Phenomena (2014).
Author
Prof.
Julien Beaudoin Bertrand
(Université Laval)
Co-authors
Mr
Antoine Moulet
(Max-Planck-Institut für Quantenoptik)
Dr
Eleftherios Goulielmakis
(Max-Planck-Institut für Quantenoptik)
