Freiburg 2019 – scientific programme
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FM: Fall Meeting
FM 9: Quantum Networks: Platforms and Components I
FM 9.5: Talk
Monday, September 23, 2019, 15:00–15:15, 1098
Adiabatic frequency conversion in high-Q lithium niobate whispering gallery resonators — •Yannick Minet1, Luís Reis1, Ingo Breunig1,2, 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
Over the past two decades, optical frequency conversion techniques with whispering gallery resonators (WGRs) have evolved remarkably. The frequency conversion process is mostly based on the nonlinear response of material polarization caused by intense laser light. For example, in mm-sized WGRs made of non-centrosymmetric materials, tunable optical parametric oscillators have been realized. Another way for frequency conversion is the so-called adiabatic tuning. Here, the optical path length of the circumference of the resonator is changed during its ringdown time. This induces a frequency shift for the circulating light. An advantage of adiabatic tuning is, in contrast to non-linear optical conversion methods, that this process has an efficiency of 100 %. So far, adiabatic tuning has been 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 a setup omitting a second pump laser and employing the Pockels effect for the refractive index change needed. Using this method, we can generate almost arbitrary frequency shifts of several tens of GHz. Furthermore, the use of this technique in the field of LIDAR will be discussed.