Doppler-free two-photon heterodyne spectroscopy by single-beam frequency modulation.
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.
Ducloy
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