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Chinese Physics Letters

Observation of Rydberg Series in Sodium Vapour by Two-Photon Resonant Nondegenerate Four-Wave Mixing

Wang Yan-Bang, Jiang Qian, Long Li, Xin Mi, Zuhe Yu, Panming Fu

Published Aug 16, 2001• 1 citation
Publisher

Abstract

We apply two-photon resonant nondegenerate four-wave mixing with a resonant intermediate state for the observation of Rydberg states in sodium vapour. The broadening and shift of the sodium 3 S -11 D transition perturbed by argon are investigated. This technique can achieve Doppler-free resolution of narrow spectral structures of Rydberg levels if lasers with narrow bandwidths are employed.

DOI
10.1088/0256-307x/18/9/315

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We apply two-photon resonant nondegenerate four-wave mixing with a resonant intermediate state for the observation of Rydberg states in sodium vapour. The broadening and shift of the sodium 3 S -11 D transition perturbed by argon are investigated. This technique can achieve Doppler-free resolution of narrow spectral structures of Rydberg levels if lasers with narrow bandwidths are employed.
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We apply two-photon resonant nondegenerate four-wave mixing with a resonant intermediate state to the observation of the broadening and shifting of the barium Rydberg level 6s24d 1 D 2 by collision with argon. The collision broadening and shifting cross sections are measured. This technique is purely optical, and can investigate the pressure dependence of the transverse relaxation rate Γ 21 between the Rydberg state and an intermediate state, as well as the transverse relaxation rate Γ 20 between the Rydberg state and the ground state.
We apply two-photon resonant nondegenerate four-wave mixing with a resonant intermediate state to the observation of the broadening and shifting of the barium Rydberg level 6s24d 1D2 by collision with argon.The collision broadening and shifting cross sections are measured.This technique is purely optical,and can investigate the pressure dependence of the transverse relaxation rate Γ21 between the Rydberg state and an intermediate state,as well as the transverse relaxation rate Γ20 between the Rydberg state and the ground state.
The fine-structure splitting of the 4F4F4F state of atomic sodium is determined using the technique of two-photon spectroscopy with a resonant intermediate state. The sensitivity of this Doppler-free technique allows observation of the electric-dipole-forbidden $3S\ensuremath{\rightarrow}4F$ two-photon transition. The 4F4F4F fine-structure splitting is found to be 229\ifmmode\pm\else\textpm\fi{}4 MHz. Its sign and magnitude are hydrogenic, in complete contrast to the DDD levels of Na.