Bulletin of the American Physical Society

Population transfer collisions involving nD Rydberg atoms in a CO$_{2}$ optical dipole trap

Jorge Douglas Massayuki Kondo, Luís F. Gonçalves, Jonathan Tallant, Luís Gustavo Marcassa

Published Jun 5, 2014• 0 citations

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Population transfer collisions involving nD Rydberg atoms in a CO $_{2}$ optical dipole trapPopulation transfer collisions involving nD Rydberg atoms in a CO$_{2}$ optical dipole trap

Jorge Douglas Massayuki Kondo, Luís F. Gonçalves, Jonathan Tallant, Luís Gustavo Marcassa

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In this work, we excite $n{D}_{5/2}$ Rydberg states in a dense and cold Rb atomic sample held in a 10.6 $\ensuremath{\mu}\mathrm{m}$ quasi-electrostatic trap using narrow-bandwidth laser pulses. Our goal is to study the F\"orster resonance process $n{D}_{5/2}+n{D}_{5/2}\ensuremath{\rightarrow}(n\ensuremath{-}2)F+(n+2){P}_{3/2}$ at zero electric field as a function of the total atomic density using pulsed-field ionization in the range $n=37--47$ . Such a process is almost degenerate for $n=43$ . Younge and coworkers studied this process [K. C. Younge, A. Reinhard, T. Pohl, P. R. Berman, and G. Raithel, Phys. Rev. A 79, 043420 (2009)] and attributed the observed saturation to many-body effects. Our results show that as the ground-state atomic density increases, the $n{D}_{5/2}$ state population and the population transfer starts to saturate, which is consistent with the onset of Rydberg atom blockade and previously published results. However, since our experiment allows the independent measurement of the $n{D}_{5/2}$ and $(n+2){P}_{3/2}$ state populations, we were able to obtain the $(n+2){P}_{3/2}$ state population density dependence. Our results clearly show that the $(n+2){P}_{3/2}$ state population depends quadratically on the total Rydberg atomic population, and consequently, the F\"orster resonance is a two-body process for a ground-state atomic density below $3\ifmmode\times\else\texttimes\fi{}{10}^{11}$ ${\mathrm{cm}}^{\ensuremath{-}3}$.In this work, we excite $n{D}_{5/2}$ Rydberg states in a dense and cold Rb atomic sample held in a 10.6 $\ensuremath{\mu}\mathrm{m}$ quasi-electrostatic trap using narrow-bandwidth laser pulses. Our goal is to study the F\"orster resonance process $n{D}_{5/2}+n{D}_{5/2}\ensuremath{\rightarrow}(n\ensuremath{-}2)F+(n+2){P}_{3/2}$ at zero electric field as a function of the total atomic density using pulsed-field ionization in the range $n=37--47$. Such a process is almost degenerate for $n=43$. Younge and coworkers studied this process [K. C. Younge, A. Reinhard, T. Pohl, P. R. Berman, and G. Raithel, Phys. Rev. A 79, 043420 (2009)] and attributed the observed saturation to many-body effects. Our results show that as the ground-state atomic density increases, the $n{D}_{5/2}$ state population and the population transfer starts to saturate, which is consistent with the onset of Rydberg atom blockade and previously published results. However, since our experiment allows the independent measurement of the $n{D}_{5/2}$ and $(n+2){P}_{3/2}$ state populations, we were able to obtain the $(n+2){P}_{3/2}$ state population density dependence. Our results clearly show that the $(n+2){P}_{3/2}$ state population depends quadratically on the total Rydberg atomic population, and consequently, the F\"orster resonance is a two-body process for a ground-state atomic density below $3\ifmmode\times\else\texttimes\fi{}{10}^{11}$ ${\mathrm{cm}}^{\ensuremath{-}3}$.

Physical Review AAug 18, 201411 citations

Population transfer collisions involving nD Rydberg atoms in a CO

_{2}

optical dipole trap

Cold Rydberg atoms in a CO

_{2}

optical dipole trap

In this work, we excite

n{D}_{5/2}

Rydberg states in a dense and cold Rb atomic sample held in a 10.6 $\ensuremath{\mu}\mathrm{m}$ quasi-electrostatic trap using narrow-bandwidth laser pulses. Our goal is to study the F\"orster resonance process $n{D}_{5/2}+n{D}_{5/2}\ensuremath{\rightarrow}(n\ensuremath{-}2)F+(n+2){P}_{3/2}$ at zero electric field as a function of the total atomic density using pulsed-field ionization in the range

n=37--47

. Such a process is almost degenerate for

n=43

. Younge and coworkers studied this process [K. C. Younge, A. Reinhard, T. Pohl, P. R. Berman, and G. Raithel, Phys. Rev. A 79, 043420 (2009)] and attributed the observed saturation to many-body effects. Our results show that as the ground-state atomic density increases, the

n{D}_{5/2}

state population and the population transfer starts to saturate, which is consistent with the onset of Rydberg atom blockade and previously published results. However, since our experiment allows the independent measurement of the

n{D}_{5/2}

and

(n+2){P}_{3/2}

state populations, we were able to obtain the

(n+2){P}_{3/2}

state population density dependence. Our results clearly show that the

(n+2){P}_{3/2}

state population depends quadratically on the total Rydberg atomic population, and consequently, the F\"orster resonance is a two-body process for a ground-state atomic density below $3\ifmmode\times\else\texttimes\fi{}{10}^{11}$ ${\mathrm{cm}}^{\ensuremath{-}3}$.