High-sensitivity fiber-tip photothermal gas sensor based on a 3d µ-printed fabry-pérot microcavity
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We report a miniature fiber-optic photothermal gas sensor based on a Fabry-Pérot microcavity directly 3D µ-printed on the end-face of a standard single-mode optical fiber. A detection limit of 0.4 parts-per-million for acetylene is demonstrated.