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arXiv · 1606.03334

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

Yong Yang·Xuefeng Jiang·Sho Kasumie·Guangming Zhao·Linhua Xu·Jonathan Ward·Lan Yang·Síle Nic Chormaic
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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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Yong Yang, Xuefeng Jiang, Sho Kasumie, Guangming Zhao, Linhua Xu, Jonathan Ward, Lan Yang, Síle Nic Chormaic. 2016-06-10. Four-wave mixing parametric oscillation and frequency comb generation at visible wavelengths in a silica microbubble resonator. https://doi.org/10.1364/ol.41.005266

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