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High quality lithium niobate thin film microresonators provide an idealplatform for on-chip nonlinear optics applications. However, the phase matchingcondition for efficient parametric process sets a high requirement forfabrication control. Here we demonstrate a photonic molecular structurecomposed of two strongly coupled lithium niobate microdisks of differentdiameters fabricated using femtosecond laser micromachining and focused ionbeam milling. With a continuous wave excitation, rich nonlinear opticalprocesses including cascaded four-wave mixing and stimulated Raman scatteringwere observed around the second harmonic wavelength. Our results indicate thatthe coupled microdisks form a superior system for nonlinear optical process.

Simultaneous generation of four-wave mixing and stimulated Raman  scattering in coupled lithium niobate microdisks mediated by second harmonic  generation