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Mid-infrared optical frequency combs at 2.5 μm based on crystalline microresonators

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  • C. Y. Wang

    (Max-Planck Institut für Quantenoptik, Hans-Kopfermann Strasse 1, D-85748 Garching, Germany
    École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
    Menlo Systems GmbH, Am Klopferspitz 19a, D-82152 Martinsried, Germany)

  • T. Herr

    (Max-Planck Institut für Quantenoptik, Hans-Kopfermann Strasse 1, D-85748 Garching, Germany
    École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland)

  • P. Del’Haye

    (Max-Planck Institut für Quantenoptik, Hans-Kopfermann Strasse 1, D-85748 Garching, Germany
    Menlo Systems GmbH, Am Klopferspitz 19a, D-82152 Martinsried, Germany
    Present address: National Institute of Standards and Technology, 325 Broadway, Boulder, Colarado 80305, USA)

  • A. Schliesser

    (Max-Planck Institut für Quantenoptik, Hans-Kopfermann Strasse 1, D-85748 Garching, Germany
    École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland)

  • J. Hofer

    (Max-Planck Institut für Quantenoptik, Hans-Kopfermann Strasse 1, D-85748 Garching, Germany
    Present address: Paul Scherrer Institut, 5232 Villigen PSI, Switzerland)

  • R. Holzwarth

    (Max-Planck Institut für Quantenoptik, Hans-Kopfermann Strasse 1, D-85748 Garching, Germany
    Menlo Systems GmbH, Am Klopferspitz 19a, D-82152 Martinsried, Germany)

  • T. W. Hänsch

    (Max-Planck Institut für Quantenoptik, Hans-Kopfermann Strasse 1, D-85748 Garching, Germany
    Ludwig-Maximilians-Universität München, Fakultät für Physik, Schellingstrasse 4/III, 80799 München, Germany)

  • N. Picqué

    (Max-Planck Institut für Quantenoptik, Hans-Kopfermann Strasse 1, D-85748 Garching, Germany
    Ludwig-Maximilians-Universität München, Fakultät für Physik, Schellingstrasse 4/III, 80799 München, Germany
    Institut des Sciences Moléculaires d’Orsay, CNRS, Bâtiment 350, Université Paris-Sud, 91405 Orsay, France)

  • T. J. Kippenberg

    (École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland)

Abstract

The mid-infrared spectral range (λ~2–20 μm) is of particular importance as many molecules exhibit strong vibrational fingerprints in this region. Optical frequency combs—broadband optical sources consisting of equally spaced and mutually coherent sharp lines—are creating new opportunities for advanced spectroscopy. Here we demonstrate a novel approach to create mid-infrared optical frequency combs via four-wave mixing in a continuous-wave pumped ultra-high Q crystalline microresonator made of magnesium fluoride. Careful choice of the resonator material and design made it possible to generate a broadband, low-phase noise Kerr comb at λ=2.5 μm spanning 200 nm (≈10 THz) with a line spacing of 100 GHz. With its distinguishing features of compactness, efficient conversion, large mode spacing and high power per comb line, this novel frequency comb source holds promise for new approaches to molecular spectroscopy and is suitable to be extended further into the mid-infrared.

Suggested Citation

  • C. Y. Wang & T. Herr & P. Del’Haye & A. Schliesser & J. Hofer & R. Holzwarth & T. W. Hänsch & N. Picqué & T. J. Kippenberg, 2013. "Mid-infrared optical frequency combs at 2.5 μm based on crystalline microresonators," Nature Communications, Nature, vol. 4(1), pages 1-7, June.
    • Handle: RePEc:nat:natcom:v:4:y:2013:i:1:d:10.1038_ncomms2335
    DOI: 10.1038/ncomms2335
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