München 2019 – scientific programme
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 2: Light and Radiation Sources, EUV and X-Ray Sources
K 2.3: Talk
Tuesday, March 19, 2019, 11:40–12:00, HS 3
Spatial Characterization of Intense Synthesized Sub-Cycle Pulses — •Fabian Scheiba1, Giulio Maria Rossi1, Roland E. Mainz1, Yudong Yang1,2, Miguel Silva1, Giovanni Cirmi1,2, and Franz X. Kärtner1,2 — 1Center for Free-Electron Laser Science CFEL and Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany and Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
We present the spatial characterization of coherent light synthesis. To extend the bandwidth beyond the limitation of already broadband sources such as OPAs, the coherent synthesis is a scalable approach in terms of energy and pulse duration. This has great potential as driving source for the direct generation of isolated attosecond pulses without gating techniques, which is of great advantage for attosecond science. The control over the electric field obtained by waveform synthesis promises to enhance the cutoff and efficiency of HHG. The current status of our implementation describes a 0.5 mJ pulse with at λc=1.8 µm and a temporal duration of only 4.1 fs (TL: 4.0 fs) FWHM corresponding to 0.63 cycles. A synthesis of pulses from individual OPA-sources requires precise synchronization in time e.g. via feedback on the CEP and relative phase, as well as matching the pulse modes spatially. We measure the spatial coherence between the outputs of two few-cycle OPAs in the NIR and IR and proof of principle HHG is demonstrated in gas.