Measurement of multi-exponential optical decay processes by phase-shift cavity ring-down

Year: 2009

Authors: Bescherer K., Barnes J.A., Dias S., Gagliardi G., Loock H.P., Trefiak N.R., Waechter H., Yam S.

Autors Affiliation: Department of Chemistry, Queen’s University, Kingston, ON, K7L 3N6, Canada; Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica Applicata (INOA), Pozzuoli (Naples), Italy; Department of Electrical and Computer Engineering, Queen’s University, Kingston, ON, K7L 3N6, Canada

Abstract: Multi-exponential decay waveforms are common occurrences in cavity ring-down spectroscopy and the respective ring-down times are typically obtained by fitting the ring-down waveform to the sum of exponential decay functions. In phase-shift cavity ring-down (CRD) spectroscopy the measurement of a single phase angle will not provide sufficient information and needs to be complemented by either intensity measurements or phase angle measurements at different modulation frequencies. Here, a formalism analogous to that developed for fluorescence lifetime spectroscopy is adapted to the phase-shift CRD technique and is tested for two types of waveguide CRD systems: (1) a single-mode fiber cavity in which light is confined by two identical Fiber Bragg Gratings and (2) a multimode fiber loop. By measuring the phase angle at different modulation frequencies, lifetimes for up to three different decay processes were obtained.


Volume: 96 (1)      Pages from: 193  to: 200

More Information: We thank the Natural Sciences and Engineering Research Council (NSERC) of Canada for funding this work. Financial contributions from the Swiss National Science Foundation, the Canadian Institute for Photonic Innovations (CIPI) and the Ontario Centres of Excellence (OCE) are gratefully acknowledged. GG also acknowledges financial support from the Italian Ministry for Education, University and Research (PON-SIMONA) and assistance from the Consiglio Nazionale delle Ricerche by the RSTL-project and the short term-mobility program.
KeyWords: Cavity ring-down; Cavity ring-down spectroscopy; Decay process; Exponential decay functions; Fluorescence lifetimes; In-phase; Intensity measurements; Modulation frequencies; Multi-exponential decay; Optical decay; Phase angle measurement; Phase angles; Single phase; Wave forms; Angle measurement; Light measurement; Modulation; Multimode fibers; Phase shift; Fiber Bragg gratings
DOI: 10.1007/s00340-009-3429-8

Citations: 20
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