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Mid-infrared ultra-high-Q resonators based on fluoride crystalline materials

Author

Listed:
  • C. Lecaplain

    (École Polytechnique Fédérale de Lausanne (EPFL))

  • C. Javerzac-Galy

    (École Polytechnique Fédérale de Lausanne (EPFL))

  • M. L. Gorodetsky

    (Russian Quantum Center
    Faculty of Physics, M.V. Lomonosov Moscow State University)

  • T. J. Kippenberg

    (École Polytechnique Fédérale de Lausanne (EPFL))

Abstract

The unavailability of highly transparent materials in the mid-infrared has been the main limitation in the development of ultra-sensitive molecular sensors or cavity-based spectroscopy applications. Whispering gallery mode microresonators have attained ultra-high-quality (Q) factor resonances in the near-infrared and visible. Here we report ultra-high Q factors in the mid-infrared using polished alkaline earth metal fluoride crystals. Using an uncoated chalcogenide tapered fibre as a high-ideality coupler in the mid-infrared, we study via cavity ringdown technique the losses of BaF2, CaF2, MgF2 and SrF2 microresonators. We show that MgF2 is limited by multiphonon absorption by studying the temperature dependence of the Q factor. In contrast, in SrF2 and BaF2 the lower multiphonon absorption leads to ultra-high Q factors at 4.5 μm. These values correspond to an optical finesse of , the highest value achieved for any type of mid-infrared resonator to date.

Suggested Citation

  • C. Lecaplain & C. Javerzac-Galy & M. L. Gorodetsky & T. J. Kippenberg, 2016. "Mid-infrared ultra-high-Q resonators based on fluoride crystalline materials," Nature Communications, Nature, vol. 7(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms13383
    DOI: 10.1038/ncomms13383
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