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Rostock 2019 – scientific programme

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A: Fachverband Atomphysik

A 15: Attosecond physics

A 15.4: Talk

Wednesday, March 13, 2019, 11:30–11:45, S HS 3 Physik

Probing of electronic wavefunctions and chiral structure by all-optical attosecond interferometryDoron Azoury1, Omer Kneller1, Shaked Rozen1, Barry D. Bruner1, Alex Clergerie2, Bernard Pons2, Baptiste Fabre2, Yann Mairesse2, Oren Cohen3, •Michael Krüger1, and Nirit Dudovich11Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel — 2Universite de Bordeaux - CNRS - CEA, CELIA, Talence, France — 3Department of Physics and Solid State Institute, Technion, Haifa, Israel

Phase retrieval of electronic wavefunctions generated by photo-ionization has been a long-standing challenge. Here we measure the time-reversed process of photo-ionization -- photo-recombination -- in attosecond pulse generation. We demonstrate all-optical interferometry of two independent phase-locked attosecond light sources [1]. Our measurement enables us to directly determine the phase shift associated with electron scattering and with structural minima in simple atomic systems.

In a second study, we superimpose two attosecond light sources with perpendicular polarization, achieving direct time-domain polarization control [2]. We establish an extreme-ultraviolet lock-in detection scheme, allowing the isolation and amplification of weak chiral signals. We demonstrate our scheme by a phase-resolved measurement of magnetic circular dichroism.

[1] D. Azoury et al., arXiv:1810.05021, Nature Photonics in press.

[2] D. Azoury et al., accepted for publication in Nature Photonics.

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