Confinement and manipulation of atoms using short laser pulses

Freegarde, Tim; Walz, J.; Hänsch, Theodor W.

doi:10.1016/0030-4018(95)00172-5

Cited by 27 publications

(46 citation statements)

References 16 publications

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“…A series of identical π pulses that propagate in alternating directions can confine a cloud of atoms, or accelerate them efficiently [21][22][23]. The essence of this scheme is the absorption of a photon from one beam and emission into the counterpropagating one with the 2hk momentum transfer that accompanies the process.…”

Section: B Acceleration Of Atoms and Dephasing On The Excited-state mentioning

confidence: 99%

“…Excitation on the D 1 line yields an even shorter τ deph . Of course using 5-10 ps pulses does make it possible to accelerate the atoms by repeated action of π pulses similar to [21,23]-at the expense of ground-state selectivity. The important conclusion here is that when quantum control of atoms with multiple excited-state levels is attempted, limiting time scales may appear that are shorter than τ spont , even in the absence of any collisions or inhomogeneous line-broadening mechanisms.…”

Section: B Acceleration Of Atoms and Dephasing On The Excited-state mentioning

confidence: 99%

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Quantum control of multilevel atoms with rotational degeneracy using short laser pulses

Demeter

2010

Phys. Rev. A

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We study the quantum control of multilevel atoms with rotationally degenerate levels using short laser pulses. Various control schemes are considered, ones using π pulses, frequency-chirped pulses, two consecutive pulses, or two pulses that overlap each other partially. We study the possibilities of controlling the quantum state of an ensemble of atoms distributed randomly over one or more rotationally degenerate levels initially. For the sake of concreteness we use the hyperfine level scheme of the 85 Rb D line, but the results can easily be generalized for any of the alkali-metal atoms used in cooling and trapping experiments. We find that even though a number of difficulties arise, such as unequal coupling constants between rotational sublevels or dephasing between different hyperfine levels during the interaction, control schemes using simple or multiphoton adiabatic passage can be used to control the internal states of the atoms effectively as well as the center-of-mass motion. Furthermore, it is shown that in some cases it is possible to exploit the inequality of the coupling constants to entangle the rotational substates with specific distinct translational quantum states and hence separate these substates in momentum space.

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Section: B Acceleration Of Atoms and Dephasing On The Excited-state mentioning

confidence: 99%

Section: B Acceleration Of Atoms and Dephasing On The Excited-state mentioning

confidence: 99%

Quantum control of multilevel atoms with rotational degeneracy using short laser pulses

Demeter

2010

Phys. Rev. A

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“…Initially, continuous laser radiation was used for this purpose, but now pulsed laser applications for cooling [4][5][6][7][8][9][10][11] and trapping [12][13][14][15][16] of atoms and molecules are also discussed. In [4] the deceleration of a Na beam by a counterpropagating beam of a mode-locked laser and the appearance of negative velocity atoms were observed for the first time.…”

Section: Introductionmentioning

confidence: 99%

“…The authors of [12] showed that the force resulting from the interaction of an atom with a sequence of short counterpropagating laser π pulses can propel atoms towards the small region where the pulses overlap, thus counterpropagating sequences of laser pulses may form an optical trap for atoms. In [13] stimulated focusing and deflection of an atomic Cs beam using counterpropagating picosecond laser pulses were * vr@iop.kiev.ua observed that can be treated as experimental justification of the trap idea proposed in [12].…”

Section: Introductionmentioning

confidence: 99%

“…In [13] stimulated focusing and deflection of an atomic Cs beam using counterpropagating picosecond laser pulses were * vr@iop.kiev.ua observed that can be treated as experimental justification of the trap idea proposed in [12]. The authors of [14] obtained analytical expressions for the coordinate-dependent force exerted on the atom and the atom's potential energy in the trap based on the trains of counterpropagating laser pulses.…”

Section: Introductionmentioning

confidence: 99%

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Cooling and trapping of atoms and molecules by counterpropagating pulse trains

et al. 2014

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We discuss a possible one-dimensional trapping and cooling of atoms and molecules due to their nonresonant interaction with counterpropagating light pulse trains. The counterpropagating pulses form a one-dimensional trap for atoms and molecules and a properly chosen carrier frequency detuning from the transition frequency of the atoms or molecules keeps the temperature of the atomic or molecular ensemble close to the Doppler cooling limit. The calculation by the Monte Carlo wave-function method is carried out for the two-level and three-level schemes of the atom's and the molecule's interaction with the field, respectively. The models discussed are applicable to atoms and molecules with almost diagonal Frank-Condon factor arrays. Illustrative calculations are carried out for ensemble-averaged characteristics for sodium atoms and SrF molecules in the trap. The potential for the nanoparticle light pulses's trap formed by counterpropagating light pulse trains is also discussed.

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Trapping of atoms by the counter-propagating stochastic light waves

Romanenko

Yatsenko

2017

Optics Communications

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We calculate the temperature of the atoms in the field of counter-propagating stochastic light waves (the chaotic-field model). We show that the temperature of the atomic ensemble depends on the autocorrelation time of the waves, their intensity and the detuning of the carrier frequency of the waves from the atomic transition frequency. The field can form a onedimensional trap for atoms, as is readily seen from our previous investigation of light-pressure force on an atom in counter-propagating stochastic light waves [V. I. Romanenko, B. W. Shore, L. P. Yatsenko, Opt. Commun. 268 (2006) 121-132]. We carry out numerical simulation of the atomic ensemble using paramaters appropriate for sodium atoms. Analyzing the known investigation of the light-pressure force on atoms and their motion in the counter-propagating polychromatic waves, we suggest an hypothesis that any polychromatic counter-propagating waves that have a discrete spectrum, or waves described by a stationary stochastic process, one of which repeats the other, can form a trap for atoms.

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Confinement and manipulation of atoms using short laser pulses

Abstract: The force resulting from a position-dependent sequence of interactions with short counter-propagating n--pulses of laser radiation can propel atoms towards the small region where the pulses overlap. The optical trap thus formed may be combined with Doppler-cooling laser beams.

Cited by 27 publications

References 16 publications

Quantum control of multilevel atoms with rotational degeneracy using short laser pulses

Quantum control of multilevel atoms with rotational degeneracy using short laser pulses

Cooling and trapping of atoms and molecules by counterpropagating pulse trains

Trapping of atoms by the counter-propagating stochastic light waves

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