Photon-counting technique for rapid fluorescence-decay measurement

Spencer D. Pack, Michael W. Renfro, Galen B. King, Normand M. Laurendeau

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


We report on a novel laser-induced fluorescence triple-integration method (LIFTIME) that is capable of making rapid, continuous fluorescence lifetime measurements by a unique photon-counting technique. The LIFTIME has been convolved with picosecond time-resolved laser-induced fluorescence, which employs a high-repetition-rate mode-locked laser, permitting the eventual monitoring of instantaneous species concentrations in turbulent flames. We verify the technique by application of the LIFTIME to two known fluorescence media, diphenyloxazole (PPO) and quinine sulfate monohydrate (QSM). PPO has a fluorescence lifetime of 1.28 ns, whereas QSM has a fluorescence lifetime that can be varied from 1.0 to 3.0 ns. From these liquid samples we demonstrate that fluorescence lifetime can currently be monitored at a sampling rate of up to 500 Hz with less than 10% uncertainty (1σ).

Original languageEnglish
Pages (from-to)1215-1217
Number of pages3
JournalOptics Letters
Issue number15
StatePublished - Aug 1 1998

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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