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Nat Commun. 2014 Feb 27;5:3375. doi: 10.1038/ncomms4375.

Adaptive real-time dual-comb spectroscopy.

Author information

1
1] Max Planck Institut für Quantenoptik, Laser Spectroscopy Division, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany [2].
2
1] Institut des Sciences Moléculaires d'Orsay, CNRS, Bâtiment 350, Université Paris-Sud, Orsay 91405, France [2].
3
Institut des Sciences Moléculaires d'Orsay, CNRS, Bâtiment 350, Université Paris-Sud, Orsay 91405, France.
4
1] Max Planck Institut für Quantenoptik, Laser Spectroscopy Division, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany [2] Institut des Sciences Moléculaires d'Orsay, CNRS, Bâtiment 350, Université Paris-Sud, Orsay 91405, France [3] Ludwig-Maximilians-Universität München, Fakultät für Physik, Schellingstrasse 4/III, 80799 München, Germany.
5
1] Max Planck Institut für Quantenoptik, Laser Spectroscopy Division, Hans-Kopfermann-Strasse 1, 85748 Garching, Germany [2] Ludwig-Maximilians-Universität München, Fakultät für Physik, Schellingstrasse 4/III, 80799 München, Germany.

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.

PMID:
24572636
PMCID:
PMC3948060
DOI:
10.1038/ncomms4375
[Indexed for MEDLINE]
Free PMC Article

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