Selective Coupling Enhances Harmonic Generation of Whispering-Gallery Modes

Trainor, Luke S.; Sedlmeir, Florian; Peuntinger, Christian; Schwefel, Harald G. L.

doi:10.1103/PhysRevApplied.9.024007

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Selective Coupling Enhances Harmonic Generation of Whispering-Gallery Modes

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Sedlmeir, Florian
University of Otago;
Quantum Information Processing, Leuchs Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Trainor, L. S., Sedlmeir, F., Peuntinger, C., & Schwefel, H. G. L. (2018). Selective Coupling Enhances Harmonic Generation of Whispering-Gallery Modes. Physical Review Applied, 9(2): 024007. doi:10.1103/PhysRevApplied.9.024007.

Cite as: https://hdl.handle.net/21.11116/0000-0003-F707-F

Abstract

We demonstrate second-harmonic generation (SHG) in an x-cut congruent lithium niobate (LN) whispering-gallery mode (WGM) resonator. First, we show theoretically that independent control of the coupling of the pump and signal modes is optimal for high conversion rates. A coupling scheme based on our earlier work [F. Sedlmeir et al., Phys. Rev. Applied 7, 024029 (2017)] is then implemented experimentally to verify this improvement. Thereby, we are able to improve on the efficiency of SHG by more than an order of magnitude by selectively outcoupling using a LN prism, utilizing the birefringence of it and the resonator in kind. This method is also applicable to other nonlinear processes in WGM resonators.