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Physical Review Letters

Observation of Electromagnetically Induced Transparency in Collisionally Broadened Lead Vapor

J. E. Field, Kenneth H. Hahn, Stephen E. Harris

Published Dec 23, 1991• 12 citations
Publisher

Abstract

As stated in the text, Figs. 3 and 4 (transmission versus probe laser detuning) were taken at an energy of nJ in a 0.5-mm-diam beam. We should have noted that when the probe energy is increased to 150 n3 (— 10 W/cm ) the absorption cross section at the transmission maximum increases by a factor of approximately 2. At this energy density, with or without the coupling laser present, transmitted probe energy is no longer linear with incident probe energy.

DOI
10.1103/physrevlett.67.3733.2

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As stated in the text, Figs. 3 and 4 (transmission versus probe laser detuning) were taken at an energy of nJ in a 0.5-mm-diam beam. We should have noted that when the probe energy is increased to 150 n3 (— 10 W/cm ) the absorption cross section at the transmission maximum increases by a factor of approximately 2. At this energy density, with or without the coupling laser present, transmitted probe energy is no longer linear with incident probe energy.
In this paper, we report the observation of electromagnetically induced transparency in collisionally broadened lead vapor. Electromagnetically induced transparency based on lifetime broadening has been observed by Boiler et al), where transparency was induced by a quantum interference. We extend the regime of electromagnetically induced transparency to collisionaly broadened resonance lines. A strong field which couples a resonantly broadened state to another state with a smaller collisional rate decreases the loss, and the transmission of an optically thick media is increased from below our dynamic range (Io/Iin<10−6)to Io/Iin = 10−1
In this study, optical Bloch equations with and without neighboring hyperfine states near the degenerate two-level system (DTLS) in the challenging case of [Formula: see text]Rb D2 transition, which involves the Doppler broadening effect, are solved. The calculated spectra agree well with the experimental results obtained based on the coupling-probe scheme with orthogonal linear polarizations of the coupling and probe fields. The mechanisms of electromagnetically induced absorption (electromagnetically induced transparency) for the open [Formula: see text] and 3 transitions (open [Formula: see text] and 3 transitions) are determined to be the effect of the strong closed [Formula: see text] transition line (strong closed [Formula: see text] transition line); this finding is based on a comparison between the calculated absorption profiles of the DTLS without neighboring states and those of all levels with neighboring states, depending on the coupling and probe power ratios. Furthermore, based on the aforementioned comparison, the crucial factors that enhance or reduce the coherence effects and lead to the transformation between electromagnetically induced absorption and electromagnetically induced transparency, are (1) the power ratios between the coupling and probe beams, (2) the openness of the excited state, and (3) effects of the neighboring states due to Doppler broadening in a real atomic system.