Long-length and thermally stable high-finesse Fabry-Perot interferometers made of hollow core optical fiber

Abstract

We made and characterized two Fabry-Perot interferometer samples made of the latest-generation hollow core fiber with sub-1-dB/km loss. Thanks to this low transmission loss, we achieved a finesse of over 140 and 120, for interferometer lengths of 5 and 23 m, respectively. This resulted in transmission peaks as narrow as 47 kHz. Our all-fiber Fabry-Perot interferometers have standard single-mode fiber pigtails (for easy integration in conventional fiber optic systems) and employ fiber mode field adapters to enable low-loss coupling between the pigtails and the low-loss hollow core fiber. The high-reflectivity mirrors (>98 %) were deposited directly on the fiber mode field adapters, which were glued to the hollow core fiber, resulting in permanently-aligned Fabry-Perot interferometers. We also measured how the position of the transmission peaks change with temperature (an important performance metrics for most applications, e.g., when used as a narrow-band band-pass filter) and found that it changed 14.5 times less in our Fabry-Perot interferometer relative to a similar device made of standard single mode fiber.

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Identifiers

ORCID for Eric Numkam Fokoua: orcid.org/0000-0003-0873-911X

ORCID for Thomas Bradley: orcid.org/0000-0001-6568-5811

ORCID for Francesco Poletti: orcid.org/0000-0002-1000-3083

ORCID for David J. Richardson: orcid.org/0000-0002-7751-1058

ORCID for Radan Slavík: orcid.org/0000-0002-9336-4262

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