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Conference on Lasers and Electro-Optics

Electromagnetically induced transparency with spectator momenta

Hui Xia, Scott J. Sharpe, Andrew J. Merriam, G. Y. Yin, Stephen E. Harris

Published Jan 1, 1998• 0 citations
Publisher

Abstract

Summary form only given.The prototype situation for both coherent population trapping and electromagnetically induced transparency (EIT) occurs in an ideal three-state atom. We show that, to obtain transparency and near unity refractive index, instead of tuning the lasers to a Ramanlike subset of the split transitions, one should tune the lasers to the centers of gravity of the splittings that are caused by the spectator momentum. We also report the first demonstration of EIT with pulsed lasers in an optically thick sample of atoms which exhibit hyperfine structure using this approach. We obtain the real and imaginary parts of the dipole moment for the multistate system by weak probe perturbation theory and numerical simulations.

DOI
10.1109/iqec.1998.680277

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Electromagnetically induced transparency with spectator momenta

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We describe a method and present experimental results for obtaining electromagnetically induced transparency by adjusting the frequencies of two lasers so that they coincide with the centers of gravity of two hyperfine split transitions. No hyperfine states are in Raman resonance and the zero of the dipole moment results from the interference of the manifold of cooperating m states.

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Conference on Lasers and Electro-Optics•Aug 29, 2005•0 citations
Summary form only given.The prototype situation for both coherent population trapping and electromagnetically induced transparency (EIT) occurs in an ideal three-state atom. We show that, to obtain transparency and near unity refractive index, instead of tuning the lasers to a Ramanlike subset of the split transitions, one should tune the lasers to the centers of gravity of the splittings that are caused by the spectator momentum. We also report the first demonstration of EIT with pulsed lasers in an optically thick sample of atoms which exhibit hyperfine structure using this approach. We obtain the real and imaginary parts of the dipole moment for the multistate system by weak probe perturbation theory and numerical simulations.
Summary form only given. Electromagnetically induced transparency (EIT) refers to a phenomenon, whereby the optically resonant transition is rendered nearly transparent by applying a strong coupling laser field. The mechanism of EIT is usually explained in terms of quantum coherence or quantum interference. This EIT has attracted increasing interest because absorption associated with nonlinear optical processes can be removed. In the typical three-level /spl lambda/-system, which includes the ground state and the metastable state, when the atomic population is prepared in the superposition of the states by the coupling fields, the optical response of the media to the probe field is significantly modified. Since this is a coherent control of an electric field by another field via the atomic coherence, several schemes to control light coherently have been suggested. We propose an optical coherent control scheme of the polarization of optical pulses using the EIT quantum coherence, and numerically study its applicability to fast optical switching.
Summary form only given. We have developed a formalism for rendering the (near)resonant interaction of two electromagnetic fields with an inhomogeneously broadened system consisting of three-level /spl Lambda/-atoms confined in an ultrathin cell of thickness 10 /spl mu/m or less. The peculiar features of this model stem from the fact that the free interaction time of atoms with two laser fields is solely determined by the wall-to-wall time of atomic flight. Unusual absorptive and dispersive properties of this system have been found. Thus, we show that the absorption spectrum of the probe field and the fluorescence signal from the upper atomic level contain two sub-Doppler dips. One of them is originated from the optical pumping due to the leak of atomic population from the upper atomic level, white the other much narrower dip corresponds to the electromagnetically induced transparency (EIT) effect established in the medium due to the coherent population trapping of the atoms. When the coupling field is tuned into the exact resonance with the corresponding atomic transition, the locations of the two dips on the frequency scale coincide, whereas in the case of nonzero detuning of the coupling field, the two dips are shifted from each other by the amount of this detuning. This is because the EIT is very sensitive to the Raman resonance condition, while the OP is most efficient in the vicinity of the resonance of the probe field with the atomic transition frequency.
We demonstrate electromagnetically induced transparency (EIT) in a sample of rubidium atoms, trapped in an optical dipole trap. Mixing a small amount of σ−σ^-σ−-polarized light to the weak σ+σ^+σ+-polarized probe pulses, we are able to measure the absorptive and dispersive properties of the atomic medium at the same time. Features as small as 4 kHz have been detected on an absorption line with 20 MHz line width.
Summary form only given. Electromagnetically induced transparency (EIT) is a process by which a normally absorbing material is made transparent by application of electromagnetic radiation. It has a number of applications, including lasing without inversion and slow light. We see that the EIT resonances corresponding to the hyperfine levels are either inhibited, or enhanced depending on the position of the hyperfine transitions in relation to the applied rf field. We discuss the role of level splitting (destruction of EIT) and three photon resonance peaks in the resulting spectra. A 2 cm rubidium cell, heated to approximated 60 C is probed with a 780 nm laser.