Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 67: Photonics III
Q 67.4: Talk
Friday, March 21, 2014, 17:15–17:30, UDL HS3038
Angle cut, birefrigent whispering gallery mode resonators — •Florian Sedlmeir1,2,3, Martin Hauer1, Josef Fürst1, Gerd Leuchs1,2, and Harald G. L. Schwefel1,2 — 1Max Planck Institute for the Science of Light, 91058 Erlangen, Germany — 2Intitute for Optics, Information and Photonics, University of Erlangen-Nuremberg, Germany — 3SAOT, School of Advanced Optical Technologies, University of Erlangen-Nuremberg, Germany
Crystalline whispering gallery mode (WGM) resonators are widely used for multiple applications as their high Q factors, compact size and comparably small modal volumes permit highly efficient nonlinear processes. Usually such WGM resonators are fabricated in the z-cut geometry, where the optic axis coincides with the symmetry axis. In such a cavity, phasematching is difficult to achieve. In general it is only possible in a very narrow bandwidth and therefore limiting the tunability of the device. Recently WGM resonators in the x-cut geometry were investigated: They provide phasematching over a huge wavelength regime as one modal family (the extraordinary one) experiences a varying index of reflection around the resonators equator. We studied an even more general geometry: an angle cut (neither x- nor z-cut) magnesium fluoride resonator. Here we present our results on the linear properties of the modes in terms of position dependent polarization, Q∼108 factors and coupling behaviour. It turns out that there are at least three modal families showing different, in general elliptical, polarization.