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High-repetition-rate frequency comb up- and down-conversion in synchronously driven ((2))(chi) microresonators
Optical frequency combs are a key technology for optical precision measurements. So far, most frequency combs operate in the near-infrared regime (NIR). Many applications, however, require combs in the ultraviolet (UV), visible (VIS) or mid-infrared (MIR) spectral ranges. This can be achieved by making use of nonlinear-optical processes. In this contribution, we demonstrate the e ffi cient conversion of frequency combs with a repetition rate of 21 GHz to UV, VIS and MIR wavelengths in a synchronously driven high-Q microresonator with second-order optical nonlinearity. This opens up a new path for applications including, but not limited to, molecular sensing and quantum optics.

Authors: J. Szabados, V. Brasch, S. J. Herr, E. Obrzud, Y. C. Jia, S. Lecomte, et al.

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