Optical frequency combs are a key technology for optical precision measurements. So far, most frequency combsoperate 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-opticalprocesses. In this contribution, we demonstrate the effcient conversion of frequency combs with a repetition rateof 21 GHz to UV, VIS and MIR wavelengths in a synchronously driven high-Q microresonator with second-orderoptical nonlinearity. This opens up a new path for applications including, but not limited to, molecular sensingand quantum optics.
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