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

C. Lecaplain, C. Javerzac-Galy, M. L. Gorodetsky and T. J. Kippenberg ()
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C. Lecaplain: École Polytechnique Fédérale de Lausanne (EPFL)
C. Javerzac-Galy: École Polytechnique Fédérale de Lausanne (EPFL)
M. L. Gorodetsky: Russian Quantum Center
T. J. Kippenberg: École Polytechnique Fédérale de Lausanne (EPFL)

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: 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.

Date: 2016
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DOI: 10.1038/ncomms13383

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