Freiburg 2024 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 59: Lasers II
Q 59.1: Vortrag
Freitag, 15. März 2024, 11:00–11:15, HS 1015
Low Repetition Rate Optical Frequency Combs for Precision Spectroscopy — •Muhammad Thariq1, Francesco Canella1,2,3, Johannes Weitenberg1,4, Fabian Schmid1,5, Paras Dwivedi1,6, Gianluca Galzerano3, Theodor W. Hänsch1,6, Thomas Udem1,6, and Akira Ozawa1 — 1Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany — 2Dipartimento di Fisica, Politecnico di Milano, 20133 Milan, Italy — 3Istituto di Fotonica e Nanotecnologie - Consiglio Nazionale delle Ricerche, 20133 Milan, Italy — 4Fraunhofer-Institut für Lasertechnik ILT, 52074 Aachen, Germany — 5Institute for Quantum Electronics, ETH Zürich, 8093 Zurich, Switzerland — 6Fakultät für Physik, Ludwig-Maximilians-Universität München, 80799 Munich, Germany
High harmonic generation (HHG) can be used to generate extreme ultraviolet (XUV) frequency combs (FCs) for precision spectroscopy. Unfortunately, HHG requires very high peak power for frequency conversion. In this work, we propose to use a low repetition rate FC to drive HHG, where the repetition rate is reduced using an AOM-based pulse picker, while the peak power of the FC is increased, allowing HHG to be performed at moderate average powers. A 40 kHz repetition rate FC is demonstrated from a 40 MHz repetition rate mode-locked Yb:KYW oscillator. Pulse amplification to 4.175 µJ pulse energy is achieved using multi-stage Yb:LuAG amplifiers, with future plans to reach up to 50 µJ. The results show the prospect of generating XUV frequency combs with average powers below 10 W, making XUV FCs more accessible to researchers across disciplines.
Keywords: frequency combs; high harmonic generation; extreme ultraviolet; precision spectroscopy; low repetition rate