Dual-comb interferometry via repetition-rate switching of a single frequency comb

TL;DR

This paper introduces a novel dual-comb interferometry method using a single frequency comb with rapid repetition-rate switching, enabling high-resolution measurements with simplified setup and extended non-ambiguity range.

Contribution

The authors demonstrate a new technique for dual-comb interferometry that simplifies the setup by using a single comb with rapid repetition-rate switching, enhancing practicality and cost-effectiveness.

Findings

Preserves full speed and resolution of standard dual-comb interferometry

Offers significant experimental simplification and cost savings

Extends non-ambiguity range for absolute distance measurements

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 non-ambiguity range as a result of the continuous repetition-rate switching.