Direct Observation of Atomic Energy Level Shifts in Two-Photon Absorption
- 6 January 1975
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 34 (1) , 1-4
- https://doi.org/10.1103/physrevlett.34.1
Abstract
We report direct observation of optically induced shifts of atomic energy levels in sodium vapor that occur in two-photon absorption. These shifts must be considered in high-resolution two-photon spectroscopy. Two cw dye laser beams of different frequencies and propagating in opposite directions are utilized to obtain high-resolution spectra. The intensity and frequency dependence of the level shifts are examined.Keywords
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