Regensburg 2019 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 4: Focus: Whispering-Gallery-Mode Resonators
KFM 4.4: Vortrag
Montag, 1. April 2019, 10:40–11:00, H47
Adiabatic frequency conversion in high-Q lithium niobate whispering gallery resonators — •Yannick Minet1, Luís Reis1, Ingo Breunig1, and Karsten Buse1,2 — 1Laboratory for Optical Systems, Department of Microsystems Engineering, IMTEK, University of Freiburg, Georges- Köhler-Allee 102, D-79110 Freiburg, Germany — 2Fraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstraße 8, D-79110 Freiburg, Germany
Optical frequency conversion in Whispering gallery resonators (WGRs) is mostly based on the nonlinear response of material polarization caused by intense laser light. For example in WGRs made of non-centrosymmetric materials tunable OPOs have been realized and in WGRs made of centrosymmetric materials frequency combs. Another way for frequency conversion is adiabatic tuning. Here, the optical length of the circumference of the resonator is changed during its ring-down time. This induces a frequency shift of the circulating light. Conventionally, this is achieved by changing the refractive index by generating free electrons or via the ac-Kerr effect. Both schemes require an additional pump laser. We present an alternative approach based on the linear electro-optic effect. Compared with the other schemes, the experimental setup is considerably simpler. Furthermore, it is applicable for all wavelengths in the transparency range of the resonator material used. Using this method, we can generate almost arbitrary waveforms and frequency shifts of several tens of GHz. We will also discuss a possible use of this technique for sensing and LIDAR applications.