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Physics Letters A

Population transfer on Ne metastable atoms

J. Leveau, S. Valignat, F. Deigat, A. Erbeia

Published Jun 1, 1975• 0 citations
Publisher
DOI
10.1016/0375-9601(75)90424-7

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We report the first experimental demonstration of coherent population transfer, induced by stimulated Raman adiabatic passage, via continuum states. Population is transferred from the metastable state 2s(1)S(0) to the excited state 4s(1)S(0) in helium atoms in a two-photon process mediated by coherent interaction with the ionization continuum. While incoherent techniques usually do not permit any population transfer in such a process, we show that stimulated Raman adiabatic passage allows significant population transfer to take place also via ultrafast decay channels.
We investigate a three-step population scheme to efficiently transfer atoms to a particular metastable state of atomic dysprosium, and present evidence of adiabatic passage in the first step. This scheme will be employed in an ongoing search for parity nonconservation (PNC) in dysprosium. In order to excite a large fraction of the transverse velocity distribution, laser beams with divergences matched to the atomic beam are applied in the first and second steps. The total efficiency of the population transfer is analyzed, and the implications for the PNC work are discussed.