Optimal control of multiphoton ionization of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="normal">Rb</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>molecules in a magneto-optical trap

Weise, Fabian; Birkner, Sascha; Merli, A.; Weber, Stefan; Sauer, Franziska; Wöste, L.; Lindinger, Albrecht; Salzmann, Wenzel; Mullins, Terry; Eng, J.; Albert, Magnus; Wester, Roland; Weidemüller, Matthias

doi:10.1103/physreva.76.063404

Cited by 6 publications

(6 citation statements)

References 22 publications

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“…The first experiments on ultracold molecules using femtosecond (fs) laser pulses investigated the suppression of photoassociation by applying a chirp [16] or closed feedback loop optimization [17]. Further work, in which coherent control techniques have been successfully applied on ultracold molecules, includes the optimization of multi-photon ionization of ultracold Rb 2 [18] and cooling of molecules to the vibrational ground state [19,20].…”

Section: Introductionmentioning

confidence: 99%

Characteristic oscillations in the coherent transients of ultracold rubidium molecules using red and blue detuned pulses for photoassociation

Weise¹,

Merli²,

Eimer³

et al. 2009

J. Phys. B: At. Mol. Opt. Phys.

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We investigate the interaction of femtosecond laser pulses with an ensemble of ultracold rubidium atoms by applying shaped excitation pulses with two different types of spectral filtering. Although the pulses, which are frequency filtered with a high pass, have no spectral overlap with molecular states, we observe coherent molecular transients. Similar transients obtained with nearly transform-limited pulses, where only the atomic resonance is removed, reveal two differing oscillatory components. The resulting transients are compared among themselves and supported with quantum dynamical simulations which indicate a photoassociation process. The effect is due to the strong field interaction of the pulse with the colliding atom pair.

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Section: Introductionmentioning

confidence: 99%

Characteristic oscillations in the coherent transients of ultracold rubidium molecules using red and blue detuned pulses for photoassociation

Weise¹,

Merli²,

Eimer³

et al. 2009

J. Phys. B: At. Mol. Opt. Phys.

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“…The last two columns show the energy differences |E vg −E ve | and the characteristic times T L vg,ve , calculated with formula (10). The energy origin is the dissociation limit E 6s+6p 3/2 of the 1 g (6s, 6p 3 of the dynamics: the vibrational movement in each potential well and the beating between the two coupled wavepackets, which are superpositions of vibrational functions corresponding to each electronic potential, as in (6) and (7). Table 1 gives a list of energies E v , vibrational periods T vib , and characteristic beating times T L vg ,ve between levels in the ground and excited electronic states which contribute significantly in the exchange of populations between the two coupled channels; it also contains the overlaps < χ vg |χ ve > with a 3 Σ + u levels.…”

Section: Analysis Of the Population Transfer During The Pulsementioning

confidence: 99%

“…On the other hand, frequency-chirped light pulses in the nanosecond range were used to coherently control ultracold atomic Rb collisions showing the enhancement of short-range collisional flux [4,5]. Other experimental developments trying to establish coherent control techniques for formation of cold molecules explored multiphoton photoassociative ionization in an Rb magneto-optical trap combining femtoseconds and continuous lasers [6] and optimal control of multiphoton ionization of Rb 2 molecules using femtosecond laser pulses in a closed feedback loop [7]. Theoretical studies of pulsed photoassociation explored a variety of schemas to control cold molecular dynamics: with chirped pulses [8][9][10][11], pump-dump schemes to stabilize the cold molecules [12][13][14][15] and schemes using an adiabatic passage [16,17].…”

Section: Introductionmentioning

confidence: 99%

Formation of cold molecules by shaping with light the short-range interaction between cold atoms: photoassociation with strong laser pulses

Vatasescu

2009

J. Phys. B: At. Mol. Opt. Phys.

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The paper investigates cold molecules formation in the photoassociation of two cold atoms by a strong laser pulse applied at short interatomic distances, which lead to a molecular dynamics taking place in the light-induced (adiabatic) potentials.A two electronic states model in the cesium dimer is used to analyse the effects of this strong coupling regime and to show specific results: i) acceleration of the ground state population to the inner zone due to a non-impulsive regime of coupling at short and intermediate interatomic distances; ii) formation of cold molecules in strongly bound levels of the ground state, where the population at the end of the pulse is much bigger than the population photoassociated in bound levels of the excited state; iii) the final momentum distribution of the ground state wavepacket keeping the signatures of the maxima in the initial wavefunction continuum. It is shown that the topology of the light-induced potentials plays an important role in dynamics.

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“…[20][21][22] Evolutionary algorithms and programmable pulse shapers in a closed feedback-loop have been employed to find optimal pulse shapes yielding the desired product with enhanced yield. 20 These have been successfully applied to control various processes, such as molecular fragmentation, 23,24 ionization, 25,26 and alignment. 27 Besides the ability to control molecular dynamics by distinct laser pulse shapes it is also desirable to understand the physical mechanisms underlying the control schemes.…”

Section: Introductionmentioning

confidence: 99%

Coherent control of the ultrafast dissociative ionization dynamics of bromochloroalkanes

Plenge

Wirsing

Wagner-Drebenstedt

et al. 2011

Phys. Chem. Chem. Phys.

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We report on the coherent control of the ultrafast ionization and fragmentation dynamics of the bromochloroalkanes C(2)H(4)BrCl and C(3)H(6)BrCl using shaped femtosecond laser pulses. In closed-loop control experiments on bromochloropropane (C(3)H(6)BrCl) the fragment ion yields of CH(2)Cl(+), CH(2)Br(+), and C(3)H(3)(+) are optimized with respect to that of the parent cation C(3)H(6)BrCl(+). The fragment ion yields are recorded in additional experiments in order to reveal the energetics of cation fragmentation, where laser-produced plasma radiation is used as a tunable pulsed nanosecond vacuum ultraviolet radiation source along with photoionization mass spectrometry. The time structure of the optimized femtosecond laser pulses leads to a depletion of the parent ion and an enhancement of the fragment ions, where a characteristic sequence of pulses is required. Specifically, an intense pump pulse is followed by a less intense probe pulse where the delay is 0.5 ps. Similarly optimized pulse shapes are obtained from closed-loop control experiments on bromochloroethane (C(2)H(4)BrCl), where the fragment ion yield of CH(2)Br(+) is optimized with respect to that of C(2)H(4)BrCl(+) as well as the fragment ion ratios C(2)H(2)(+)/CH(2)Br(+) and C(2)H(3)(+)/C(2)H(4)Cl(+). The assignment of the underlying control mechanism is derived from one-color 804 nm pump-probe experiments, where the yields of the parent cation and several fragments show broad dynamic resonances with a maximum at Δt = 0.5 ps. The experimental findings are rationalized in terms of dynamic ionic resonances leading to an enhanced dissociation of the parent cation and some primary fragment ions.

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Optimal control of multiphoton ionization ofRb2molecules in a magneto-optical trap

Cited by 6 publications

References 22 publications

Characteristic oscillations in the coherent transients of ultracold rubidium molecules using red and blue detuned pulses for photoassociation

Characteristic oscillations in the coherent transients of ultracold rubidium molecules using red and blue detuned pulses for photoassociation

Formation of cold molecules by shaping with light the short-range interaction between cold atoms: photoassociation with strong laser pulses

Coherent control of the ultrafast dissociative ionization dynamics of bromochloroalkanes

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