Fiber-optic ring-down spectroscopy using a tunable picosecond gain-switched diode laser |
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| Authors: | M Andachi T Nakayama M Kawasaki S Kurokawa H-P Loock |
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| Institution: | (1) Kyoto Prefectural Technology Center for Small and Medium Enterprises, Kyoto Research Park, Kyoto 600-8813, Japan;(2) Department of Molecular Engineering, Kyoto University, Kyoto 615-8510, Japan;(3) National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan;(4) Department of Chemistry, Queen’s University, Kingston, ON, K7L 3N6, Canada |
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| Abstract: | Visible and near-infrared laser light pulses were coupled into two different types of optical fiber cavities. One cavity consisted
of a short strand of fiber waveguide that contained two identical fiber Bragg gratings. Another cavity was made using a loop
of optical fiber. In either cavity ∼40 ps laser pulses, which were generated using a custom-built gain-switched diode laser,
circulated for a large number of round trips. The optical loss of either cavity was determined from the ring-down times. Cavity
ring-down spectroscopy was performed on 200 pL volumes of liquid samples that were injected into the cavities using a 100 μm
gap in the fiber loop. A detection limit of 20 ppm of methylene blue dye in aqueous solution, corresponding to a minimum absorptivity
of εC<6 cm-1, was realized.
PACS 42.62.Fi; 42.81.-i |
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