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AIP conference proceedings

Observation and relaxation of the two-photon-excited-state trilevel echo in sodium vapor

T. J. Chen, D. DeBeer, Sven R. Hartmann

Published Jan 1, 1986• 1 citation
Publisher

Abstract

The collisional relaxation cross section of the excited 3P‐3D superposition state of Na with Ar is measured. A photon echo from the 3P‐3D transition in Na vapor is spontaneously emitted at λ=8183 Å after excitation of the 3D state and for the 3P3/2 state. (AIP)
DOI
10.1063/1.35713

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Coherence relaxation in Na vapor was studied utilizing a pump-probe method with femtosecond pulses. The coherence was created by the pump pulse, which excited the Na atoms to the 4S state. The atoms were further excited to the 7P state by the probe pulse. As a result a coherent UV radiation was emitted by the atoms. This emission was used to study the relaxation of both the 4S-3S and 7P-3S coherent superpositions. The relaxation is mainly due to collisions with the Ar atoms serving as a buffer gas. Coherence relaxation times and collisional cross-sections for the Na-Ar collision pairs were extracted experimentally.
We have measured the He-, Ne-, and Ar-induced relaxation properties of the $3S\ensuremath{-}nS$ ($3S\ensuremath{-}nD$) superposition states of atomic sodium, where nnn ranges from 5 to 20 (4 to 34). The measurements were made using the trilevel echo effect. We find that the effective collisional cross section first increases (as a function of nnn) at low nnn, and then decreases to a lower asymptotic limit at high nnn. This behavior is similar to that previously observed for the $3S\ensuremath{-}nP$ series. We also find that the difference between the collisional cross sections for SSS and DDD series superpositions closely approximates the inelastic collision cross sections measured elsewhere for the ddd states. A theoretical description of the trilevel echo effect used to make the measurements is presented.
Abstract. The cross sections for the Na.4D/! Na.4F / excitation energy transfer induced by collisions with He, Ar and Na ground-state atoms have been measured. The sodium atoms in the 4D state have been produced by two-photon excitation using cw laser radiation at 578.89 nm. Within a model which takes into account collisional population and depopulation of the 4F level as well as radiative relaxation (direct or cascade) of the 3D, 4P, 4D and 4F states ending in the 3P level, the rate for the Na.4D / ! Na.4F / collisional transfer turns out to be related to the ratio of the steady-state populations created in 3D and 4D states. They have been determined by measuring the fluorescence intensities of the 3D! 3P and 4D! 3P transitions. The measurements yield the following cross section values for those