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A new technique for quantitative detection of atomic absorption by intracavity dye-laser quenching is studied. For the sodium D(2) line, a sensitivity of 7 x 10(4) atoms/cm(3) x 1% quenching is obtained; and the sensitivity in single-pass detection is 4 x 10(8) atoms/cm(3) x 1% absorption for a 15-cm cell. Use of a cw dye laser improves the sensitivity and the stability. The dependence of the sensitivity on the bandwidth of laser action is measured, and a simple theoretical consideration is given for single-pass absorption.
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