Six-and eight-photon resonance processes in sodium vapor
Drabovich K. N. , Kovrigin A. I. , Pershin S. M. , Sinyavskii N. M., Surovegin A. L.
We have made the first study of four-and six-photon resonances in atomic sodium by the methods of optical mixing spectroscopy. We have experimentally demonstrated the possibility of spectroscopy probing many-photon transitions in atoms by means of higher-order parametric effects.