Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 24: Attosecond physics I
A 24.2: Vortrag
Donnerstag, 17. März 2011, 16:45–17:00, BAR 205
Qspider: Retrieval of the amplitude and phase of an electron wave packet using with attosecond and infrared pulses. — •Alexis Chacon1 and Camilo Ruiz2 — 1Grupo de Investigación en Óptica Extrema (GIOE), Universidad de Salamanca, Pl. de la Merced s/n 37008 Salamanca. Spain — 2Centro de Laseres Pulsados (CLPU), Pl. de la Merced s/n 37008 Salamanca. Spain
There is a large collection of optical techniques to characterize the amplitude and phase of a ultrashort laser pulse. Among these techniques there are SPIDER, FROG, FROG CRAB and RABBIT, etc. We propose to transfer some of the ideas of these optical techniques used for laser pulses but now for the characterization of electron wave packets (EWP) in atoms and molecules using attosecond pulse trains and infrared pulses. In particular, we try to implement the SPIDER technique to retrieve the amplitude and phase of an electron wave packet.
The SPIDER technique for laser pulses is based in the construction of an spectral interferogram and the application of an algebraic algorithm to obtain the spectral phase. The main elements used to build this interferogram are: 1) the generation of two copies of the pulse, 2) the use of a time delay between the two copies, 3) the introduction of a spectral shearing, and 4) the measurement of the spectral interferogram. The same steps can be implemented with EWP using the tools of attoscience.
In this paper we show the demonstration of the technique by retrieving the amplitude and phase of the electric dipole in the H2+ molecule and exploring the best parameters for an accurate retrieval.