Experimental observation of internally-pumped parametric oscillation and quadratic comb generation in a ${\chi }^{(2)}$ whispering-gallery-mode microresonator

Abstract

We report on the experimental observation of internally-pumped parametric oscillation in a high-Q lithium niobate microresonator under conditions of natural phase-matching. Specifically, launching near-infrared pump light around 1060 nm into a $z$-cut congruent lithium niobate microresonator, we observe the generation of optical sidebands around the input pump under conditions where second-harmonic generation is close to natural phase-matching. We find that a wide range of different sideband frequency shifts can be generated by varying the experimental parameters. Under particular conditions, we observe the cascaded generation of several equally-spaced sidebands around the pump -- the first steps of optical frequency comb generation via cavity-enhanced second-harmonic generation.

arXiv comment5 pages, 5 figures; a wider range of indicative results added to Fig. 3 and text changed accordingly in version 2

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Cited by in corpus (12)

• Pockels Soliton Microcomb
• Ultra-Broadband Kerr Microcomb Through Soliton Spectral Translation
• Frequency comb generation via cascaded second-order nonlinearities in microresonators
• Frequency comb generation threshold in ${\chi }^{(2)}$ optical microresonators
• Walk-off controlled self-starting frequency combs in ${\chi }^{(2)}$ optical microresonators
• Coupled-mode theory for microresonators with quadratic nonlinearity
• Bright-soliton frequency combs and dressed states in chi(2) microresonators
• An ultra-stable microresonator-based electro-optic dual frequency comb
• Photon-photon polaritons in chi(2) microresonators
• Two-color flat-top solitons in microresonator-based optical parametric oscillators
• Dual backgrounds and their stability during ${\chi }^{(2)}$ comb generation in microresonators
• Fine structure of second-harmonic resonances in χ^{(2)} optical microresonators