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

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??m. These values correspond to an optical finesse of , the highest value achieved for any type of mid-infrared resonator to date.

SUBMITTER: Lecaplain C

PROVIDER: S-EPMC5121327 | biostudies-literature | 2016 Nov

REPOSITORIES: biostudies-literature

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

Lecaplain C C Javerzac-Galy C C Gorodetsky M L ML Kippenberg T J TJ

Nature communications 20161121

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-ideali ...[more]

PMID: 27869119

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