Freiburg 2024 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 46: Lasers I

Q 46.7: Talk

Thursday, March 14, 2024, 12:30–12:45, HS 3118

Ultraviolet supercontinuum generation using a differentially-pumped glass chip — •Josina Hahne^1,2, Vincent Wanie³, Pasquale Barbato^4,5, Sergey Ryabchuk^1,2, Ammar Bin Wahid³, David Amorim³, Erik P. Månson³, Andrea Trabattoni^5,6, Roberto Osellame⁵, Rebeca Martínez Vázquez⁵, and Francesca Calegari^1,2,3 — ¹Universität Hamburg — ²The Hamburg Centre for Ultrafast Imaging — ³CFEL, Hamburg — ⁴Politecnico di Milano — ⁵CNR-INF, Milano — ⁶Leibniz Universität Hannover

UV pulses with a duration of a few- or sub-femtosecond durations are of great interest in the field of ultrafast spectroscopy, since they provide access to the UV-induced electron dynamics in biologically relevant molecules. Sub-3-fs UV pulses have previously been generated by third-harmonic generation in gas cells or resonant dispersive wave emission in hollow capillaries. Here, we present a compact glass chip design which combines a gas cell with two differential pumping stages, providing high gas confinement, to minimize the reabsorption of the generated UV pulses and preserve their temporal duration. The resulting UV pulse energy reaches up to 0.8 uJ in neon (0.2% conversion efficiency). The generated spectra spann from 200 to 325 nm, supporting transform limit durations of 2.1 fs in argon and 1.9 fs in neon. To gain further insight into the nonlinear process, numerical simulations have been performed. Ionisation has been found to be key for the exceptional broadening of the UV pulses due to the spatio-temporal reshaping of the driving field as well as plasma blue shifting.

Keywords: nonlinear optics; attosecond science; micromachining; UV generation