Regensburg 2019 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 4: Focus: Whispering-Gallery-Mode Resonators
KFM 4.2: Vortrag
Montag, 1. April 2019, 10:00–10:20, H47
Frequency comb up- and down-conversion in synchronously driven χ(2) optical microresonators — •Jan Szabados1, Simon Johannes Herr1, Victor Brasch2, Ewelina Obrzud2,3, Yuechen Jia1, Steve Lecomte2, Karsten Buse1,4, Ingo Breunig1,4, and Tobias Herr2 — 1Laboratory for Optical Systems, Department of Microsystems Engineering - IMTEK, University of Freiburg, Georges-Köhler-Allee 102, D-79110 Freiburg, Germany — 2Swiss Center for Electronics and Microtechnology (CSEM), Time and Frequency, Rue de l'Observatoire 58, CH-2000 Neuchâtel, Switzerland — 3Geneva Observatory, University of Geneva, Chemin des Maillettes 51, CH-1290 Versoix, Switzerland — 4Fraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstraße 8, D-79110 Freiburg, Germany
We demonstrate the broadband conversion of a high-repetition rate frequency comb from the near-infrared (NIR) to the mid-infrared (MIR), visible (VIS) and ultraviolet (UV) wavelength domains. The employed lithium niobate WGRs are synchronously pumped by a frequency comb with a repetition rate in excess of 10 GHz and pico- to femtosecond pulse duration. Cascaded second-order nonlinear processes transfer significant parts of the fundamental frequency comb to harmonic and sub-harmonic optical frequencies. This way, the second and the third harmonics in the visible and the fourth harmonic in the ultra-violet spectral region are generated. Also, subharmonic generation of the fundamental comb lines into the mid-infrared spectral range via degenerate parametric oscillation is demonstrated. Non-degenerate processes enable wavelength-tunable signal- and idler-comb generation.