Harmonic saturated spectroscopy for improved atomic detection.
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.
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Frueholz
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Gelbwachs