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Frequency combs, i.e. spectra of equidistant laser lines, are enabling tools in precision spectroscopy and optical frequency metrology [1,2]. Conventionally, frequency combs are generated using mode-locked lasers, where the mode-locking of the optical comb lines implies the generation of a train of ultra-short optical pulses. Frequency combs can link optical frequencies to radio-frequencies (RF) and...
We demonstrate spectral broadening of a low noise microresonator based near-infrared frequency comb to almost two thirds of an octave as required for self-referencing. The low noise properties of the unbroadened spectrum are preserved.
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