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Nonlinear nanophotonic devices can provide a compelling path for the on-chip generation of coherent visible light, with potential applications in metrology and coherent control of quantum systems. I will discuss how third-order optical parametric oscillation in silicon nitride microresonators, in particular, can enable a wide range of visible wavelengths to be accessed, by realizing systems in which the generated signal and idler fields are widely separated in frequency from the pump. For example, we demonstrate devices pumped at 780 nm (385 THz), in which the visible wavelength signal and near-infrared wavelength idler are separated by more than an octave. Moreover, through geometric control of dispersion, a few THz shift in pump frequency results in a >130 THz shift in the generated signal frequency, enabling visible light at red, orange, yellow, and green wavelengths to be created. I will discuss the conditions needed to realize this widely-separated optical parametric oscillation process while suppressing potential competing nonlinear processes.
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