Abstract

We experimentally demonstrate a versatile technique for performing dual-comb interferometry using a single frequency comb. By rapid switching of the repetition rate, the output pulse train can be delayed and heterodyned with itself to produce interferograms. The full speed and resolution of standard dual-comb interferometry is preserved while simultaneously offering a significant experimental simplification and cost savings. We show that this approach is particularly suited for absolute distance metrology due to an extension of the nonambiguity range as a result of the continuous repetition rate switching.

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Supplementary Material (1)

NameDescription
» Visualization 1       At-a-distance acoustic eavesdropping with PHIRE. A plexiglass window provides the target reflection from which the interferometric phase of the interferograms are extracted. This unwrapped phase is low-pass filtered to produce an audio waveform.

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