Topic
Atomic coherence
About: Atomic coherence is a research topic. Over the lifetime, 877 publications have been published within this topic receiving 29395 citations.
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TL;DR: In this paper, the optical clock transition of lattice-trapped degenerate fermionic Sr in the Mott-insulating regime has been investigated using high-resolution imaging and spectroscopy.
Abstract: We implement imaging spectroscopy of the optical clock transition of lattice-trapped degenerate fermionic Sr in the Mott-insulating regime, combining micron spatial resolution with submillihertz spectral precision. We use these tools to demonstrate atomic coherence for up to 15 s on the clock transition and reach a record frequency precision of 2.5×10^{-19}. We perform the most rapid evaluation of trapping light shifts and record a 150 mHz linewidth, the narrowest Rabi line shape observed on a coherent optical transition. The important emerging capability of combining high-resolution imaging and spectroscopy will improve the clock precision, and provide a path towards measuring many-body interactions and testing fundamental physics.
163 citations
TL;DR: Sodium atoms have been stored in a blue-detuned dipole trap based on sheets of argon ion laser light which support against gravity, resulting in a large reduction in the perturbation of the atomic levels due to the trapping potential.
Abstract: Sodium atoms have been stored in a blue-detuned dipole trap based on sheets of argon ion laser light which support against gravity. In this trap, the atoms spend most of their time in free fall, resulting in a large reduction in the perturbation of the atomic levels due to the trapping potential. This reduction enabled us to probe the ground state hyperfine splitting with a measurement time of 4 s, yielding a linewidth of 0.125 Hz and a Ramsey fringe contrast of 43%. The coherence time was $\ensuremath{\sim}$300 times longer than achieved in a red-detuned Nd:YAG laser dipole trap with comparable depth.
157 citations
TL;DR: In this article, the authors studied nonlinear optical parametric processes in a resonantly driven multilevel system displaying quantum interference effects and showed that a pair of correlated Stokes and anti-Stokes fields can be generated from infinitesimally small initial values.
Abstract: Nonlinear optical parametric processes are studied in a resonantly driven multilevel system displaying quantum interference effects. It is shown that in such systems a new regime of nonlinear amplification is possible, in which a pair of correlated Stokes and anti-Stokes fields can be generated from infinitesimally small initial values. An atomic coherence grating emerges during this process of efficient nonlinear amplification. The present analysis explains the results of recent optical phase conjugation experiments involving atomic phase coherence.
154 citations
TL;DR: In this article, the authors review some recent theoretical and experimental studies on resonantly enhanced nonlinear interactions in phase-coherent media (phaseonium) and suggest an efficient optical parametric oscillator based on population trapped atoms.
Abstract: Publisher Summary This chapter reviews some recent theoretical and experimental studies on resonantly enhanced nonlinear interactions in phase-coherent media (“phaseonium”). Basic physics of resonant enhancement and applications such as efficient optical phase conjugation and nonlinear laser spectroscopy are discussed in the chapter. It suggests an efficient optical parametric oscillator based on population trapped atoms. Such an oscillator has very remarkable properties because it combines high efficiency with wide tunability. It illustrates those efficient nonlinear interactions in phase coherent media can be extended into domains involving just a few interacting light quanta at a time. This indicates that an entire new domain of quantum nonlinear optics is emerging from these studies. The chapter explores that unusually efficient frequency up-conversion using atomic coherence in a cascade system has been observed.
149 citations
TL;DR: In this article, the authors demonstrate an atom localization scheme based on monitoring of the atomic coherences. And they show that this coherence has the same fringe pattern as produced by a Fabry-Perot interferometer and thus measurement of the atom coherence would localize the atom.
Abstract: We demonstrate an atom localization scheme based on monitoring of the atomic coherences. We consider atomic transitions in a Lambda configuration where the control field is a standing wave field. The probe field and the control field produce coherence between the two ground states. We show that this coherence has the same fringe pattern as produced by a Fabry-Perot interferometer and thus measurement of the atomic coherence would localize the atom. Interestingly enough the role of the cavity finesse is played by the ratio of the intensities of the pump and probe. This is in fact the reason for obtaining extreme subwavelenth localization. We suggest several methods to monitor the produced localization.
148 citations