Photoassociation and coherent transient dynamics in the interaction of ultracold rubidium atoms with shaped femtosecond pulses. II. Theory

Merli, A.; Eimer, Frauke; Weise, Fabian; Lindinger, Albrecht; Salzmann, Wenzel; Mullins, Terry; Götz, Simone; Wester, Roland; Weidemüller, Matthias; Ağanoğlu, Ruzin; Koch, Christiane P.

doi:10.1103/physreva.80.063417

Cited by 29 publications

(37 citation statements)

References 37 publications

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“…Subsequent experiments [24][25][26][27][28] observed coherent transients in excitedstate molecules photoassociated with femtosecond pulses and there was some evidence for the production of ground-state molecules [25]. In contrast, our approach is to control the dynamics of ultracold atoms at large R using nanosecondtime-scale frequency-chirped pulses.…”

Section: Introductionmentioning

confidence: 96%

Coherent control of ultracoldRb85trap-loss collisions with nonlinearly frequency-chirped light

et al. 2011

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We present results on coherent control of ultracold trap-loss collisions using 40-ns pulses of nonlinearly frequency-chirped light. The chirps, either positive or negative, sweep ∼1 GHz in 100 ns and are centered at various detunings below the D 2 line of 85 Rb. At each center detuning, we compare the collisional rate constant β for chirps that are linear in time, concave-down, and concave-up. For positive chirps, we find that β generally depends very little on the shape of the chirp. For negative chirps, however, we find that β can be enhanced by up to 50(20)% for the case of the concave-down shape. This occurs at detunings where the evolution of the wave packet is expected to be coherent. An enhancement at these detunings is also seen in quantum-mechanical simulations of the collisional process.

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Section: Introductionmentioning

confidence: 96%

Coherent control of ultracoldRb85trap-loss collisions with nonlinearly frequency-chirped light

et al. 2011

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“…Early experiments demonstrated that the photodestruction of ultracold molecules could be coherently controlled using shaped [30] and chirped [31] ultrafast pulses. More recently, coherent transients were observed in excited-state molecules photoassociated with femtosecond pulses [32][33][34][35][36]. In addition, some evidence for the production of molecules in the electronic ground state was reported [33].…”

Section: Introductionmentioning

confidence: 98%

Quantum dynamical calculations of ultracold collisions induced by nonlinearly chirped light

et al. 2012

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We describe quantum dynamical calculations of ultracold 85 Rb trap-loss collisions induced by pulses of light whose frequency is chirped on the nanosecond time scale. The chirped light excites the ground-state collisional wave function to the long-range attractive potential and escape from the trap is modeled by an absorbing boundary at short range. Both positive and negative chirps are considered and various chirp shapes and detunings are examined. For positive chirps, the loss rates are rather independent of the chirp shape. Negative chirps, on the other hand, show a dependence on chirp shape for detunings where collisional flux can be coherently returned to the ground state. These trends are consistent with the results of a recent experiment.

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“…Apparently the time scale much shorter than the lifetime of the excited electronic state can overcome the losses caused by spontaneous emission. A frequency-domain cutoff and time-domain asymmetric laser pulses have been implemented to avoid atomic transition [18,19] and to maintain more photoassociated molecules caused by off-resonant excitation [20,21].…”

Section: Introductionmentioning

confidence: 99%

Photoassociation dynamics driven by a modulated two-color laser field

et al. 2011

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Photoassociation (PA) dynamics of ultracold cesium atoms steered by a modulated two-color laser fieldis investigated theoretically by numerically solving the time-dependent Schrödinger equation. The PA dynamics is sensitive to the phase of envelope (POE) φ and the period of the envelope T p , which indicates that it can be controlled by varying POE φ and period T p . Moreover, we introduce the time-and frequency-resolved spectrum to illustrate how the POE φ and the period T p influence the intensity distribution of the modulated laser pulse and hence change the time-dependent population distribution of photoassociated molecules. When the Gaussian envelope contains a few oscillations, the PA efficiency is also dependent on POE φ. The modulated two-color laser field is available in the current experiment based on laser mode-lock technology.

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Photoassociation and coherent transient dynamics in the interaction of ultracold rubidium atoms with shaped femtosecond pulses. II. Theory

Cited by 29 publications

References 37 publications

Coherent control of ultracoldRb85trap-loss collisions with nonlinearly frequency-chirped light

Coherent control of ultracoldRb85trap-loss collisions with nonlinearly frequency-chirped light

Quantum dynamical calculations of ultracold collisions induced by nonlinearly chirped light

Photoassociation dynamics driven by a modulated two-color laser field

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