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We describe a novel experimental setup that combines the advantages of bothlaser-induced fluorescence and cavity ring-down techniques. The simultaneousand correlated measurement of the ring-down and fluorescence signals yieldsabsolute absorption coefficients for the fluorescence measurement. The combinedmeasurement is conducted with the same sample in a single, pulsed laser beam.The fluorescence measurement extends the dynamic range of a stand-alone cavityring-down setup from typically three to at least six orders of magnitude. Thepresence of the cavity improves the quality of the signal, in particular thesignal-to-noise ratio. The methodology, dubbed cavity-enhanced laser-inducedfluorescence (CELIF), is developed and rigorously tested against thespectroscopy of 1,4-bis(phenylethynyl)benzene in a molecular beam and densitymeasurements in a cell. We outline how the method can be utilised to determineabsolute quantities: absorption cross sections, sample densities andfluorescence quantum yields.

Absolute absorption and fluorescence measurements over a dynamic range of 10$^6$ with cavity-enhanced laser-induced fluorescence