Abstract

A novel method for improved cw laser-induced atomic fluorescence detection that we call harmonic saturated spectroscopy takes advantage of the nonlinear response of an optically saturated atomic system to reject background sources of interference. A reduction in background and an improved SNR are demonstrated for sodium detection in an air–acetylene flame. The dependence of the harmonic signal on intensity, excitation waveform, and depth of modulation was also investigated.

© 1980 Optical Society of America

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