A spheroidal shape of microresonator avoids the traditional wavelength limitations imposed by the resonator material in the generation of microresonator-based optical frequency combs.
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Eikema, K. Liberated from material dispersion. Nature Photon 5, 258–260 (2011). https://doi.org/10.1038/nphoton.2011.70
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DOI: https://doi.org/10.1038/nphoton.2011.70
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