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A: Fachverband Atomphysik
A 2: Interaction with strong or short laser pulses I
A 2.1: Invited Talk
Monday, March 14, 2022, 14:00–14:30, A-H1
Attosecond pulse control with sub-cycle, infrared waveforms — •Miguel Angel Silva-Toledo1,3, Yudong Yang1, Roland E. Mainz1, Giulio Maria Rossi1, Fabian Scheiba1,2,3, Phillip D. Keathley4, Giovanni Cirmir1,2, and Franz X. Kärtner1,2,3 — 1Center for Free-Electron Laser Science CFEL and Deutsches Elektronen-Synchrotron DESY, Notkestrasse e 85, 22607 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany — 3Physics Department, Universität Hamburg, Jungiusstrasse 9, 20355 Hamburg — 4Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
Sub-femtosecond shaping of light fields driving high-harmonic generation (HHG) allows amplitude- and phase-control of coherent extreme ultraviolet and soft X-ray radiation. Here, we experimentally demonstrate such control in the energy range covering ∼ 30 - 200 eV using tailored, sub-cycle pulses (i.e., shorter than their main oscillation period), delivered by an optical parametric amplification-based waveform synthesizer. Sub-cycle pulse synthesis is realized by coherently combining near-infrared (λ0 ∼ 0.8 µm, ∼ 6 fs, ∼ 150 µJ) and infrared (λ0 ∼ 1.6 µm, ∼ 8 fs, ∼ 500 µJ) pulses which, after varying their carrier envelope and relative phases, lead to the direct generation of spectrally controlled isolated attosecond pulses (IAPs). Attosecond-resolved measurements characterize the temporal profile of the generated IAPs. Experimental observations are also combined with HHG simulations. Our study will aid research on optimal driver fields for efficient and tunable HHG.