Four-wave mixing parametric oscillation and frequency comb generation at visible wavelengths in a silica microbubble resonator

Abstract

Frequency comb generation in microresonators at visible wavelengths has found applications in a variety of areas such as metrology, sensing, and imaging. To achieve Kerr combs based on four-wave mixing in a microresonator, dispersion must be in the anomalous regime. In this work, we demonstrate dispersion engineering in a microbubble resonator (MBR) fabricated by a two-CO${}_2$ laser beam technique. By decreasing the wall thickness of the MBR down to 1.4 $\mu$m, the zero dispersion wavelength shifts to values shorter than 764 nm, making phase matching possible around 765 nm. With the optical \textit{Q}-factor of the MBR modes being greater than $10^7$, four-wave mixing is observed at 765 nm for a pump power of 3 mW. By increasing the pump power, parametric oscillation is achieved, and a frequency comb with 14 comb lines is generated at visible wavelengths.

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• Visible nonlinear photonics via high-order-mode dispersion engineering
• Hyperparametric oscillation via bound states in the continuum
• Optical Frequency Combs in Aqueous and Air Environments at Visible to Near-IR Wavelengths
• A tellurite glass optical microbubble resonator
• Cavity ring-up spectroscopy for dissipative and dispersive sensing in a whispering gallery mode resonator
• Bandpass transmission spectra of a whispering-gallery microcavity coupled to an ultrathin fiber
• Structural characterization of thin-walled microbubble cavities
• All-Optical Nanopositioning of High-Q Silica Microspheres