Berlin 2018 – scientific programme
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 5: Whispering Gallery Mode Resonators II
KFM 5.8: Talk
Monday, March 12, 2018, 17:50–18:10, EMH 025
Towards a whispering gallery mode resonator based wavemeter — •Thomas Halbauer1,2, Golnoush Shafiee1,2, Gerhard Schunk1,2, Alexander Otterpohl1,2, Florian Sedlmeir1,2, Dmitry Strekalov1,2, Harald G. L. Schwefel3, Gerd Leuchs1,2, and Christoph Marquardt1,2 — 1Max Planck Institute for the Science of Light, Staudtstr. 2, 91058 Erlangen, Germany — 2Institute of Optics, Information and Photonics, University Erlangen-Nürnberg, Staudtstr. 7 B2, 91058 Erlangen, Germany — 3The Dodd-Walls Centre for Photonic and Quantum Technologies, Department of Physics, University of Otago, 730 Cumberland Street, 9016 Dunedin, New Zealand
Macroscopic crystalline whispering gallery mode resonators (WGMR) can provide the possibility for a whispering gallery type wavemeter (WGTW) in just one monolithic device. The frequency spacings between different resonance frequencies of the WGMR represent a unique fingerprint of the frequency of the exciting laser. We use an electro-optic frequency tuning mechanism to shift the fingerprint of an unknown source with fixed frequency. The accuracy is only limited by the linewidth of resonances. In combination with our experimental resonance frequency analysis [1], this unambiguously reveals the excitation wavelength. For achieving the required temperature stability, we implement a scheme based on the differential shift between differently polarized resonance frequencies of an additional locking laser.
[1] G. Schunk et al., Opt. Express 22, 30795 (2014).