arXiv:quant-ph/0312195 · Physical Review A

Bichromatic electromagnetically induced transparency in cold rubidium atoms

J. Wang, Yifu Zhu, Kaijun Jiang, Mingsheng Zhan

Published Dec 10, 2003• 86 citations

Abstract

In a three-level atomic system coupled by two equal-amplitude laser fields with a frequency separation 2\ensuremath{\delta}, a weak probe field exhibits a multiple-peaked absorption spectrum with a constant peak separation \ensuremath{\delta}. The corresponding probe dispersion exhibits steep normal dispersion near the minimum absorption between the multiple absorption peaks, which leads to simultaneous slow group velocities for probe photons at multiple frequencies separated by \ensuremath{\delta}. We report an experimental study in such a bichromatically coupled three-level \ensuremath{\Lambda} system in cold ${}^{87}\mathrm{Rb}$ atoms. The multiple-peaked probe absorption spectra under various experimental conditions have been observed and compared with the theoretical calculations. \textcopyright{} 2003 American Institute of Physics.

DOI: 10.1103/physreva.68.063810

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arXiv:quant-ph/0312195 · Physical Review A

Bichromatic electromagnetically induced transparency in cold rubidium atoms

J. Wang, Yifu Zhu, Kaijun Jiang, Mingsheng Zhan

Published Dec 10, 2003• 86 citations

arXiv HTML PDF

Abstract

{}^{87}\mathrm{Rb}

atoms. The multiple-peaked probe absorption spectra under various experimental conditions have been observed and compared with the theoretical calculations. \textcopyright{} 2003 American Institute of Physics.

DOI: 10.1103/physreva.68.063810

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{}^{87}\mathrm{Rb}

L

of the atomic vapor layer in the range $\ensuremath{\sim}780--1600\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, for which

L

is comparable to the laser wavelength $\ensuremath{\lambda}$ resonant with the

{D}_{2}

line

(780\phantom{\rule{0.3em}{0ex}}\mathrm{nm})

. It is revealed that the transmission spectrum of the probe laser contains two sub-Doppler peaks that have different linewidths. The narrow peak corresponds to EIT, whereas the broader one results from velocity-selective optical pumping (VSOP) and repumping processes. It is demonstrated that in the case of nonzero detuning of the coupling laser, the EIT resonance and VSOP are shifted with respect to each other on the frequency scale, which makes it possible to observe a competition between the two effects (this is not possible to realize in an ordinary cell). Also, the Dicke-type coherent narrowing effect depending on the ratio $L∕\ensuremath{\lambda}$ influences the absorption spectrum of the probe laser. Formation of an EIT resonance is substantially favored for the atoms with slow normal velocity, caused by their longer interaction time with the bichromatic laser field. As a result of the predominant contribution of these atoms, the observed linewidth of the EIT resonance is only $\ensuremath{\sim}9\phantom{\rule{0.3em}{0ex}}\mathrm{MHz}$, which is more than ten times narrower than the inverse window-to-window flight time. In an external magnetic field, three and five EIT resonances have been observed for the vapor thickness of $L=2\ensuremath{\lambda}$, on

^{87}\mathrm{Rb}

and

^{85}\mathrm{Rb}

, respectively.

{}^{87}\mathrm{Rb}

atoms produced by a magneto-optical trap. In this experimental system, a coupling laser and a weak probe laser form a three-level \ensuremath{\Lambda}-type configuration of electromagnetically induced transparency (EIT); a microwave drives a magnetic-dipole transition between the fourth level and the ground state that is coupled with the excited state by the coupling laser. The observed spectral profile of probe absorption exhibits a very sharp peak emerging inside a narrow EIT dip. Such spectral feature provides more opportunities in manipulating atomic-optical response.