Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 5: Whispering Gallery Mode Resonators II
KFM 5.4: Vortrag
Montag, 12. März 2018, 16:10–16:30, EMH 025
Self-pumped three-wave mixing in laser-active whispering-gallery resonators — •Simon J. Herr1, Karsten Buse1,2, and Ingo Breunig1,2 — 1Department of Microsystems Engineering - IMTEK, University of Freiburg, 79110 Freiburg, Germany — 2Fraunhofer Institute for Physical Measurement Techniques IPM, 79110 Freiburg, Germany
High-Q whispering-gallery resonators (WGRs) made from lithium niobate (LN) have proven to be an excellent platform for highly efficient three-wave mixing. Typically, frequency conversion is induced by pumping whispering-gallery modes (WGMs) of the resonator by means of an external narrow-linewidth light source. Due to the high field enhancement within the high-Q cavity, light-matter interaction is strongly enhanced. Here, we present an important step towards further integration, by using the high-Q cavity not only for nonlinear optics but also for the generation of narrow-linewidth laser light, which is required for pumping nonlinear optical processes. This is achieved by implementing laser-active ions into the host material of the WGR. Importantly, the laser active ions can be excited with cheap light sources, while lasing in high-Q WGMs leads to an intrinsically mode-matched and narrow-linewidth laser oscillation, capable of pumping nonlinear optical processes within the very same high-Q cavity. With these highly integrated devices, self-frequency doubling is achieved in neodymium-doped lithium niobate. A radially poled quasi-phasematching structure allows for self-optical parametric oscillation.