Berlin 2014 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects
Q 30.29: Poster
Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais
Increasing quality through the surrounding: Whispering gallery mode resonators and their environment — •Richard Zeltner1, Florian Sedlmeir1,2,3, 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
Dielectric whispering gallery mode (WGM) resonators are based on the concept of total internal reflection at their dielectric interface. Their losses are only induced by residual material absorption and by surface scattering. Nevertheless, they have a very broad field of applications in modern physics such as laser stabilization and sensing of particles down to the nanometer scale. For most applications high Q factors are required. In crystalline WGM resonators record Q factors up to 1011 have been recorded which demand a sophisticated procedure of cutting, polishing, and cleaning of the resonator. To decrease the surface scattering loss of the resonator and therefore to achieve high Q factors with less or even without any polishing, we investigate the effect of the refractive index of the surrounding, as the scattering loss scales with the refractive index contrast. Furthermore, we report on the change in the length of the evanescent field in dependence of the refractive index contrast between medium and prism.