Novel detection of aerosols: combined cavity ring-down and fluorescence spectroscopy

High fluences inside cavity ring-down spectroscopy optical resonators lend themselves to fluorescence or Raman spectroscopy. An instrument at 488 nm was developed to measure extinction, and fluorescence of aerosols. A detection limit of 6 x 10;-9 cm;-1Hz;-1/2 (0.6 Mm;-1Hz;-1/2) was achieved. The flu...

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Bibliographic Details
Published inOptics express Vol. 13; no. 9; pp. 3376 - 3387
Main Authors Richman, Bruce, Kachanov, Alexander, Paldus, Barbara, Strawa, Anthony
Format Journal Article
LanguageEnglish
Published United States 02.05.2005
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Summary:High fluences inside cavity ring-down spectroscopy optical resonators lend themselves to fluorescence or Raman spectroscopy. An instrument at 488 nm was developed to measure extinction, and fluorescence of aerosols. A detection limit of 6 x 10;-9 cm;-1Hz;-1/2 (0.6 Mm;-1Hz;-1/2) was achieved. The fluorescence spectral power collected from a single fluorescent microsphere was 10 to 20 pW/nm. This power is sufficient to obtain the spectrum of a single microsphere with a resolution of 10 nm and signal-to-noise ratio of ~10. The relative concentrations of two types of fluorescent microspheres were determined from a time-integrated fluorescence measurement of a mixture of both.
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ISSN:1094-4087
1094-4087
DOI:10.1364/opex.13.003376