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Frontiers in Optics

Polarization Dependent Manipulation of Optical Properties in a Tripod System of Metastable Helium

Santosh Kumar, T. Lauprêtre, Fabien Bretenaker, Fabienne Goldfarb, Rupamanjari Ghosh

Published Jan 1, 2013• 0 citations
Publisher

Abstract

We show that by rotating the orthogonally polarized coupling and probe beams with respect to an applied magnetic field, one can manipulate the detuned EIT peaks and the central CPO peak in a tripod system of He*.
DOI
10.1364/fio.2013.fth1c.5

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We experimentally and theoretically study two different tripod configurations using metastable helium (4{}^{4}4He*), with the probe field polarization perpendicular and parallel to the quantization axis, defined by an applied weak magnetic field. In the first case, the two dark resonances interact incoherently and merge together into a single electromagnetically induced transparency peak with increasing coupling power. In the second case, we observe destructive interference between the two dark resonances inducing an extra absorption peak at the line center.
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In this paper we investigate the optical properties of an open four-level tripod atomic system driven by an elliptically polarized probe field and compare its properties with the corresponding closed system. Our results reveal that absorption, dispersion, group velocity, and optical bistability of the probe field can be manipulated by adjusting the phase difference between the two circularly polarized components of a single coherent field and cavity parameters, i.e., the atomic exit rate from cavity and atomic injection rates.