Hannover 2020 – scientific programme
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MO: Fachverband Molekülphysik
MO 16: Femtosecond Spectroscopy II
MO 16.9: Talk
Thursday, March 12, 2020, 16:00–16:15, f102
Generation of broad bandwidth sub-30 fs deep ultraviolet pulses at high repetition rates — •Lukas Bruder1, Lukas Wittenbecher2, Pavel Kolesnichenko2, and Donatas Zigmantas2 — 1Institute of Physics, University of Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany — 2Department of Chemical Physics, Lund University, P.O. Box 124, 22100 Lund, Sweden
The generation of deep ultraviolet optical pulses featuring broad spectral bandwidth and short pulse durations is a challenging task, especially when using high repetition rate (> 100 kHz) laser systems that provide only low pulse energies (< 10 µJ) to drive the nonlinear conversion processes. Yet, high repetition rates are highly desirable in spectroscopic applications to improve statistics. Based on achromatic phase matching [1], we have recently accomplished the generation of 265 nm-pulses with 10-20 nm bandwidth using input pulse energies of 0.5 µJ at a repetition rate of 200 kHz. Despite the low pulse energies, we reach comparable conversion efficiencies (25 %) than in [1]. We currently compress the pulses to 25 fs, but compression to the sub-10 fs regime should be feasible.
[1] P. Baum, S. Lochbrunner, and E. Riedle, Opt. Lett. 29, 1686 (2004).