Absolute strong-field ionization probabilities of ultracold rubidium atomsстатья
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Дата последнего поиска статьи во внешних источниках: 16 января 2019 г.
Аннотация:Understanding strong-field ionization requires a quantitative comparison between experimental
data and theoretical models which is notoriously difficult to achieve. Optically trapped
ultracold atoms allow to extract absolute nonlinear ionization probabilities by imaging the
atomic density after exposure to the field of an ultrashort laser pulse. We report on such
precise measurements for rubidium in the intensity range of 1 × 1011 – 4 × 1013Wcm−2. The
experimental data are in perfect agreement with ab-initio theory, based on solving the timedependent
Schrödinger equation without any free parameters. We investigate the strongfield
response of 87Rb atoms at two different wavelengths representing non-resonant and
resonant processes in the demanding regime where the Keldysh parameter is close to unity.