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Applied Physics B

, Volume 96, Issue 1, pp 193–200 | Cite as

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

  • K. Bescherer
  • J. A. Barnes
  • S. Dias
  • G. Gagliardi
  • H.-P. LoockEmail author
  • N. R. Trefiak
  • H. Waechter
  • S. Yam
Article

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.

PACS

07.60.-j 07.60.Vg 42.60.Da 42.62.Fi 

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • K. Bescherer
    • 1
  • J. A. Barnes
    • 1
  • S. Dias
    • 1
  • G. Gagliardi
    • 2
  • H.-P. Loock
    • 1
    Email author
  • N. R. Trefiak
    • 1
  • H. Waechter
    • 1
  • S. Yam
    • 3
  1. 1.Department of ChemistryQueen’s UniversityKingstonCanada
  2. 2.Consiglio Nazionale delle Ricerche-Istituto Nazionale di Ottica Applicata (INOA)Pozzuoli (Naples)Italy
  3. 3.Department of Electrical and Computer EngineeringQueen’s UniversityKingstonCanada

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