Just over 20 years ago, the demonstration of self-referenced optical frequency combs solved a long-standing problem of linking radio- and light-frequencies. This breakthrough allowed direct measurement of the frequency of light and enabled optical atomic clocks with exquisite precision. The development of dual-comb techniques led to a second wave of activity over the last ten years. Dual comb techniques enable rapid, high-resolution spectroscopy that can be used for applications such as atmospheric monitoring or breath analysis. I will explain what an optical frequency comb is, how they are generated and used, and present some of our recent work on them.

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