Fiber-Optic Ring-Down Spectroscopy Using a Tunable Picosecond Gain-Switched Diode Laser
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Authors
Andachi, M.
Nakayama, T.
Kawasaki, M.
Kurokawa, S.
Loock, Hans-Peter
Date
2016-03-23
Type
journal article
Language
en
Keyword
Fiber-Optic Ring-Down Spectroscopy
Alternative Title
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 gainswitched
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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PubMed ID
External DOI
ISSN
0946-2171
0721-7269
0721-7269