Depolarizing collisions in ytterbium vapor: Isotropic and anisotropic relaxation |
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Authors: | N N Rubtsova S A Kochubei V N Ishchenko E B Khvorostov I V Yevseyev |
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Institution: | (1) Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, pr. Akademika Lavrent’eva 13, Novosibirsk, 630090, Russia;(2) Moscow State Institute of Engineering Physics, Kashirskoe sh. 31, Moscow, 115409, Russia |
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Abstract: | Isotropic depolarizing collisions are studied using a stimulated photon echo with a specific polarization of the excitation radiation pulses in a mixture of ytterbium with krypton for the J = 1 ? J = 0 transition of 174Yb. The difference between the relaxation rates of orientation and alignment γ b (2) ? γ b (1) of the 3 P 1(6s6p) 174Yb level is measured as a function of the krypton pressure. The collision photon echo at the J = 1 ? J = 0 transition induced by the anisotropic relaxation is studied for the Yb + Xe mixture. The power of the collision echo increases from zero with the addition of a buffer gas to ytterbium, reaches an optimal level, and decreases with an increase in the buffer gas pressure. The polarization of this collision-induced echo differs from the polarization of the conventional echo. The experimental results are in qualitative agreement with theoretical predictions. |
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