New frontiers in dual-comb spectroscopy and imaging

Optical frequency combs have revolutionised time and frequency metrology by providing rulers in frequency space that can measure large optical frequency differences and/or link microwave and optical frequencies straightforwardly. One of the most successful applications of frequency combs beyond their original intended use is dual-comb interferometry. This involves forming an interferometer using two frequency combs with slightly different line spacing. Dual-comb interferometers, which have no moving parts, have no geometric limitations to resolution. They outperform state-of-the-art devices in an increasing number of fields, including spectroscopy and three-dimensional imaging, and offer unique features such as direct frequency measurements, accuracy, precision and speed of measurement. This talk will illustrate the latest advance in this field with selected examples.