Laser Field Ionization Rates in the Barrier-Suppression Regime

Miladinović, T. B.; Petrović, Violeta

doi:10.1007/s10946-015-9505-0

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2018

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“…Recent publications discuss that ponderomotive shifts for alkali atoms substantially lower the ionization probability compared to direct ADK results due to the high polarizability of alkali atoms [39][40][41]. When using longer pulsed laser wavelengths where the adiabatic approxima-tion is genuinely valid, these effects have to be taken into account and can be tested with a high sensitivity with our method.…”

Section: Discussionmentioning

confidence: 99%

Absolute strong-field ionization probabilities of ultracold rubidium atoms

et al. 2018

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We report on precise measurements of absolute nonlinear ionization probabilities obtained by exposing optically trapped ultracold rubidium atoms to the field of an ultrashort laser pulse in the intensity range of 1 × 10 11 to 4 × 10 13 W/cm 2 . The experimental data are in perfect agreement with ab-initio theory, based on solving the time-dependent Schrödinger equation without any free parameters. Ultracold targets allow to retrieve absolute probabilities since ionized atoms become apparent as a local vacancy imprinted into the target density, which is recorded simultaneously. We study the strong-field response of 87 Rb atoms at two different wavelengths representing non-resonant and resonant processes in the demanding regime where the Keldysh parameter is close to unity.

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Section: Discussionmentioning

confidence: 99%