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A: Fachverband Atomphysik
A 43: Ultrafast Dynamics III and High-harmonic Generation (joint session MO/A)
A 43.8: Talk
Friday, March 15, 2024, 16:15–16:30, HS 3044
High-order Harmonic Generation (HHG) in the nonadiabatic regime over a sub-mm glass chip — •Sabine Rockenstein1,2, Agata Azzolin1,2, Gaia Giovanetti2, Guangyu Fan2,3, Md Sabbir Ahsan2,4, Oliviero Cannelli2, Lorenzo Colaizzi1,2,5, Erik P Månsson2, Davide Faccialà4, Fabio Frassetto4, Dario W Lodi5, Cristian Manzoni4, Rebeca M Vàzquez4, Michele Devatta4, Roberto Osellame4, Luca Poletto4, Salvatore Stagira4,5, Caterina Vozzi4, Vincent Wanie2, Andrea Trabattoni2,6, and Francesca Calegari1 — 1UHH (DE) — 2DESY (DE) — 3CUI (DE) — 4CNR (IT) — 5Politecnico di Milano (IT) — 6Uni. Hannover (DE)
HHG-based sources are nowadays operating up to the soft-x spectral region. One of the main challenges remains to extend the cut-off frequency while retaining high-photon flux. Approaches based on the so-called nonadiabatic regime have allowed to overcome phase matching limitations and achieve substantial cut-off extension [1]. We present a new HHG source, operating with high driver laser intensities (up to 1E16 W/cm2) and a laser-micromachined glass cell allowing for highly efficient gas confinement over 900 µm, to achieve nonadiabatic phase matching. The setup was operated with both 800-nm and 1500-nm sub-35-fs driving pulses. With the 800-nm driver, the HHG energy cutoff was extended to 100 eV in Argon and 180 eV in Neon, 160 eV were reached using the 1500-nm driver in Argon. Our results highlight the potential of optimizing the nonadiabatic regime for covering the water-window spectral region. [1] Johnson et al., Sci. Adv. 4(5), 2018
Keywords: High Harmonic Generation; HHG