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Cascaded second-order optical nonlinearities in on-chip micro rings

: Wolf, Richard; Breunig, Ingo; Zappe, Hans; Buse, Karsten

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Optics Express 25 (2017), Nr.24, S.29927-29933
ISSN: 1094-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IPM ()
optical resonators; integrated optical device; Wavelength Conversion Devices; polishing; thin film devices

We demonstrate cascaded Stimulated Raman Scattering (SRS), Second-Harmonic Generation (SHG), and Sum-Frequency Generation (SFG) in integrated on-chip whispering-gallery resonators (WGRs). These lithium niobate-based WGRs are fabricated using highly-parallel semiconductor manufacturing techniques coupled with specialized polishing as a post-processing step and thus represent a novel means for batch fabrication of this family of non-linear devices. We achieved record high Q-factors for on-chip lithium niobate WGRs reaching up to 3 × 106. Furthermore, we present a flexible but stable coupling scheme, which gives us the opportunity to optimize the coupling regarding the non-linear optical processes we observe.