Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 47: Attosecond physics

A 47.2: Vortrag

Donnerstag, 20. März 2014, 16:45–17:00, BEBEL E42

2D spectral interpretation of time-dependent absorption spectra of transiently-coupled excited atomic states — •Alexander Blättermann, Christian Ott, Andreas Kaldun, Thomas Ding, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

We demonstrate a two-dimensional time-domain spectroscopy method to extract amplitude and phase modifications of excited atomic states caused by the interaction with ultrashort laser pulses. The technique is based on the Fourier analysis of the absorption spectrum of perturbed polarization decay [1,2]. The analytical framework of the method reveals how amplitude and phase information can be obtained from measurements, and how interaction pathways can be separated in the two-dimensional spectral representation. We apply the method experimentally to the helium atom, which is excited by attosecond-pulsed extreme ultraviolet light [3,4], to characterize laser-induced couplings of doubly-excited states [5-7].

References:

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[2] Chen S et al., Phys. Rev. A 86 063408 (2012)

[3] Paul P. M. et al., Science 292 1689 (2001)

[4] Hentschel M et al., Nature 414 509 (2001)

[5] Lambropoulos P and Zoller P, Phys. Rev. A 24 379 (1981)

[6] Bachau H et al., Phys. Rev. A 34 4785 (1986)

[7] Chu W-C and Lin C D, Phys. Rev. A 85 013409 (2012)