Journal of Physics B Atomic Molecular and Optical Physics

Stark-shift-induced velocity-selective coherent population trapping

Maxim Olshanii

Published Dec 14, 1991• 13 citations

Abstract

The author proposes a scheme of one-dimensional Stark-shift-induced velocity-selective coherent population trapping (CPT). This scheme can be used for various types of multilevel atoms, including atoms in which the usual velocity-selective CPT is impossible.

DOI: 10.1088/0953-4075/24/23/005

Related papers

Three-dimensional velocity-selective coherent population trapping of (3+1)-level atoms

Maxim Olshanii, Vladimir G. Minogin

An effect of one-dimensional velocity-selective coherent population trapping (CPT) is generalized to the case of three dimensions. The three-dimensional non-absorbing states are found for a (3+1)-level atom interacting with a field composed of six circular polarized waves propagating along the +or-0x, +or-0y, +or-0z directions. The possibility of three-dimensional superdeep cooling of atoms is discussed.

Quantum Optics Journal of the European Optical Society Part BDec 1, 199113 citations

Observation of cooling-assisted velocity- selective coherent population trapping

M. S. Shahriar, M. T. Widmer, M. J. Bellanca +2 more

In recent years, there has been a great deal of interest in velocity selective coherent population trapping (VSCPT).1 However, since VSCPT occurs via a random walk in momentum space, in order to achieve significant VSCPT in three dimensions, it is necessary to precool and confine atoms dose to the recoil momentum. Shahriar et al.2 recently predicted that this type of cooling and velocity confinement assisted VSCPT can be achieved in one, two, or three dimensions when a Λ-system atom is excited by a pair of blue detuned Raman resonant standing waves, with a phase difference of θ = π/4.

May 8, 19941 citation

Bichromatic velocity-selective coherent population trapping

M. R. Doery, R. Gupta, T. H. Bergeman +2 more

We propose a scheme to achieve one-dimensional velocity-selective coherent population trapping in a five-level system under two-frequency laser excitation. It may be applied to either D line of alkali-metal atoms. The trapped state is a time-dependent superposition of three sublevels from two different hyperfine ground states. Stable trapping may be produced by correctly detuning the laser beams to compensate for different hyperfine and kinetic energies of these ground states. We present numerical results for a five-level model, as well as for the complete level systems appropriate for alkali-metal atoms.

Physical Review AMar 1, 199517 citations

High contrast signal in a coherent population trapping based atomic frequency standard application

M. Zhu

A polarization-selective method is developed for detecting a coherent-population-trapping (CPT) resonance signal in a vapor cell. The method uses a single laser beam with frequency modulation to induce CPT resonance and to control the AC Stark shift. The method provides a CPT resonance signal with a high contrast of 22%. Using this method, a CPT-based rubidium vapor cell frequency standard demonstrates a measured short-term stability of 1.4/spl times/10/sup -12//spl tau//sup - 1/2 /.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)Jul 8, 200427 citations

Three-dimensional velocity-selective coherent population trapping of a (3+3)-level atom

Maxim Olshanii, Vladimir G. Minogin

Optics CommunicationsMay 1, 199240 citations

Force in velocity-selective coherent population trapping: Full quantum-mechanical description

Norbert Leinfellner, Eugeny Korsunsky, Laurentius Windholz

ABSTRACT In this work we present an investigation of velocity-selective coherent population trapping (VSCPT) in asym- metric three-level schemes. The light force in such schemes is of an intrinsically transient character and shouldnot be described in a quasiclassical approach. Instead, results of the full quantum-mechanical calculations are presented with emphasis on their meaning to the efficiency of subrecoil laser cooling. 1 INTRODUCTION Laser cooling of neutral atoms has received significant advances by the introduction of velocity-selectivecoherent population trapping ((VSCPT) some years ago.1 Since it leads to atomic temperatures well below therecoil limit, studies of ultracold atoms and atomic interactions may be improved by magnitudes.The effect of VSCPT relies on optical pumping of atoms into a state WNC) which is a trap state for a certaincenter-of-mass velocity vO. This trap state is created by a destructive superposition of atomic states within amultilevel quantum system. Once being in such a state LWNC) the laser light does not interact anymore with theatom which leads to a decoupling with the rest of the system at vo. Atoms located outside this small velocityregion get a chance to be trapped by the momentum diffusion due to spontaneous emission of photons. Aftera sufficient long interaction time nearly all atoms are trapped inside a narrow momentum distribution whichcan be interpreted as cooling. The theoretical and experimental investigation of VSCPT is usually consideredby use of a three-level A-system as shown in Fig.1. Such a system can be found for example in a symmetrical

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIEJan 1, 19960 citations