High-velocity dark states in velocity-selective coherent population trapping

Widmer, M.; Doery, M. R.; Bellanca, M. J.; Buell, W. F.; Bergeman, T.; Metcalf, Harold

doi:10.1103/physreva.53.946

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…Thus we see four very narrow (FWHM _< 1) peaks in the measured momentum distribution of Fig. 5 [21]. From the point of view of Bragg reflection as described above in Sec.…”

Section: High Velocity Dark Statesmentioning

confidence: 98%

Dark States and De Broglie Wave Optics

Metcalf

1998

Acta Phys. Pol. A

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The techniques of laser cooling have now become sufficiently developed that the focus has shifted toward interesting applications such as the quantum domain of atomic motion. This topic is characterized by the failure of the classical description in which atoms move as point particles whose trajectories can be known: instead, atomic motion must be described as the optics of de Broglie waves. For example, when the de Broglie wavelength λ d B exceeds λορtical, then a classical description is insufficient (Bose condensation is done in the dark, and the quantum condition becomes λdB > nearest. neighbor distance). One of the most fascinating topics of quantized atomic motion in a laser field derives from optical dark states that can even occur in the simplest (two-level) atoms, where there are no magnetic sublevels and the polarization is irrelevant. In spite of the simplicity of this two-level atom case however, the more interesting cases occur in multilevel atoms where the internal magnetic states and external quantum states of atomic motion become truly entangled. Schrödinger called such states "the heart of quantum mechanics" because they led to puzzles such as his famous "cat" and the EPR paradox.

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“…Thus we see four very narrow (FWHM _< 1) peaks in the measured momentum distribution of Fig. 5 [21]. From the point of view of Bragg reflection as described above in Sec.…”

Section: High Velocity Dark Statesmentioning

confidence: 98%

Dark States and De Broglie Wave Optics

Metcalf

1998

Acta Phys. Pol. A

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“…So far no experimental data have been published using such a configuration. High-momentum dark states has been reported for the case with a J g = 1 → J e = 1 transition in metastable helium using a lin-angle-lin polarisation 53001-p1 configuration [11]. In that case, the dark states are characterised by two peaks at momenta ±Q k, where Q is an integer.…”

mentioning

confidence: 99%

“…However they should be the most protected states with respect to spontaneous emission processes. Following this idea and reference [11], the requirement of a closed family for VSCPT does not have to be strictly fulfilled. Indeed, considering a two-level atom coupled with a nearly resonant laser, the coherent superposition of ground states with different momenta;…”

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confidence: 99%

Low- and high-intensity velocity selective coherent population trapping in a two-level system

et al. 2009

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Abstract. -An experimental investigation is made of sub-recoil cooling by velocity selective coherent population trapping in a two-level system in Sr. The experiment is carried out using the narrow linewidth intercombination line at 689 nm. Here, the ratio between the recoil shift and the linewidth is as high as 0.64. We show that, on top of a broader momentum profile, subrecoil features develop, whose amplitude is strongly dependent on the detuning from resonance. We attribute this structure to a velocity selective coherent population trapping mechanism. We also show that the population trapping phenomenon leads to complex momentum profiles in the case of highly saturated transitions, displaying a multitude of subrecoil features at integer multiples of the recoil momentum.

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