Adaptive real-time dual-comb spectroscopy

Takuro Ideguchi, Antonin Poisson, Guy Guelachvili, Nathalie Picqué () and Theodor W. Hänsch
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Takuro Ideguchi: Max Planck Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany
Antonin Poisson: Institut des Sciences Moléculaires d’Orsay, CNRS, Bâtiment 350, Université Paris-Sud
Guy Guelachvili: Institut des Sciences Moléculaires d’Orsay, CNRS, Bâtiment 350, Université Paris-Sud
Nathalie Picqué: Max Planck Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany
Theodor W. Hänsch: Max Planck Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract The spectrum of a laser frequency comb consists of several hundred thousand equally spaced lines over a broad spectral bandwidth. Such frequency combs have revolutionized optical frequency metrology and they now hold much promise for significant advances in a growing number of applications including molecular spectroscopy. Despite an intriguing potential for the measurement of molecular spectra spanning tens of nanometres within tens of microseconds at Doppler-limited resolution, the development of dual-comb spectroscopy is hindered by the demanding stability requirements of the laser combs. Here we overcome this difficulty and experimentally demonstrate a concept of real-time dual-comb spectroscopy, which compensates for laser instabilities by electronic signal processing. It only uses free-running mode-locked lasers without any phase-lock electronics. We record spectra spanning the full bandwidth of near-infrared fibre lasers with Doppler-limited line profiles highly suitable for measurements of concentrations or line intensities. Our new technique of adaptive dual-comb spectroscopy offers a powerful transdisciplinary instrument for analytical sciences.

Date: 2014
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DOI: 10.1038/ncomms4375

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