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Contaminant-free end-capped and single-mode acetylene photonic microcell for sub-Doppler spectroscopy

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Abstract

We report on the development of an acetylene-filled photonic microcell based on an assembly process that is contaminant free and requires no helium buffer gas nor gluing procedure. The microcell consists of a 7-m-long and 30 µm core-diameter inhibited-coupling guiding hollow-core photonic crystal fiber filled with acetylene gas at a pressure in the range of 80 µbar, sealed by capping its ends with fusion-collapsing a glass-tube sleeve, and mounted on FC connectors for integration. The microcell shows a robust single-mode behavior and a total insertion loss of ${\sim}{1.5}\;{\rm dB}$. The spectroscopic merit of the formed microcell is tested by generating electromagnetic induced transparency and saturated absorption on R13 and P9 absorption lines, respectively. The sub-Doppler transparencies show a close to transit time limited linewidth of ${17}\;{\pm}\;{3}\;{\rm MHz}$. The latter was monitored for over 3 months. As a demonstration, the microcell was used to frequency stabilize a laser with fractional frequency instability improvement by a factor 50 at 100 s integration time compared to free running laser operation.

© 2021 Optical Society of America

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Supplementary Material (1)

NameDescription
Visualization 1       Observation of near field intensity profile at the output of the fully sealed PMC under mechanical stress

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