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.
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Bescherer, K., Barnes, J.A., Dias, S. et al. Measurement of multi-exponential optical decay processes by phase-shift cavity ring-down. Appl. Phys. B 96, 193–200 (2009). https://doi.org/10.1007/s00340-009-3429-8
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DOI: https://doi.org/10.1007/s00340-009-3429-8