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.
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42.62.Fi; 42.81.-i
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Andachi, M., Nakayama, T., Kawasaki, M. et al. Fiber-optic ring-down spectroscopy using a tunable picosecond gain-switched diode laser. Appl. Phys. B 88, 131–135 (2007). https://doi.org/10.1007/s00340-007-2635-5
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DOI: https://doi.org/10.1007/s00340-007-2635-5