Abstract
Dark resonances in the 154Sm Λ-system 4f 66s 2(7 F 0) ↔ 4f 66s6p(9 F 1 0) ↔ 4f 6 s 2(7 F 1) are observed alongside the velocity selective optical pumping. The shape of the resulting spectra strongly depended on the buffer gas (He, Ar) pressure due to velocity-changing collisions (VCC): the sign of the effect could be reversed from the “dark” to the “bright” resonance. The observed spectra are interpreted within the framework of the hard-sphere collision model. The role of VCC in the formation of the “dark state” in the Λ-system is discussed.
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Akimov, A.V., Sokolov, A.V., Kolachevsky, N.N. et al. Optical Pumping of Samarium Atoms in a Bichromatic Laser Field in the Presence of Velocity-Changing Collisions. Journal of Russian Laser Research 24, 129–142 (2003). https://doi.org/10.1023/A:1023677229618
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DOI: https://doi.org/10.1023/A:1023677229618