Studies of collisional dephasing of two-photon excited atomic sodium

Details Studies of collisional dephasing of two-photon excited atomic sodium Studies of collisional dephasing of two-photon excited atomic sodium

2009-10-19

arxiv.org/abs/0910.3562v2

Physics

Atomic Physics

Scientific paper

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.

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