Abstract

A new spectroscopic method for monitoring Doppler-free two-photon absorption signals is analyzed. Its principle consists of high-frequency modulation of one of the incident beams and the detection of the modulation induced by two-photon absorption in the intensity of the counterpropagating beam. The predictable advantages of this method are pointed out by comparing it with other techniques.

© 1982 Optical Society of America

Doppler-free two-photon absorption spectroscopy with a frequency-modulated dye laser

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