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Journal of the Optical Society of America B

Modulation in the spectral density and spectral degree of coherence of a Gaussian Schell-model beam through an electromagnetic induced transparency atomic vapor

Fei Zhuang, Xinyue Du, Daomu Zhao

Published Oct 13, 2010• 1 citation
Publisher

Abstract

Analytical expression is obtained for the cross-spectral density function of a Gaussian Schell-model (GSM) beam passing through an electromagnetic induced transparency (EIT) atomic vapor. The formula can be used in the study of the changes in the spectral density and spectral degree of coherence of the beam through the EIT atomic vapor. Numerical examples show that both the spectral density and the spectral degree of coherence of the GSM beam can be modulated by the Rabi frequency of the control light.

DOI
10.1364/josab.27.002279

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Analytical expression is obtained for the cross-spectral density function of a Gaussian Schell-model (GSM) beam passing through an electromagnetic induced transparency (EIT) atomic vapor. The formula can be used in the study of the changes in the spectral density and spectral degree of coherence of the beam through the EIT atomic vapor. Numerical examples show that both the spectral density and the spectral degree of coherence of the GSM beam can be modulated by the Rabi frequency of the control light.
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We study the propagation properties of an Airy beam through a four-level electromagnetic induced transparency (EIT) atomic vapor. The analytical expression for the Airy beam passing through the ABCD optical system of the EIT vapor is deduced and employed to analyze the propagation characteristics of the beam. It is shown that both the deflection position and the intensity of the Airy beam can be modulated by the Rabi frequency of the control light. Such a tunable optical behavior may have some potential applications in medicine science.
Abstract This study investigates the propagation properties of two-dimensional Airy vortex beams in an electromagnetically induced transparency (EIT) medium, based on a four-level rubidium atomic vapor system controlled by dual coupling Rabi frequencies. By establishing the ABCD transmission matrix of the EIT medium and employing the Collins integral formula, analytical expression for the propagation of the Airy vortex beam in the EIT medium is derived. Using the obtained analytical solution, this study further examines the beam’s intensity distribution, phase evolution characteristics, and their dependencies on several key parameters such as transverse scale, truncation factor, and vortex center position. Results demonstrate that the intensity of the Airy vortex beam can be modulated by the coupling Rabi frequency: with the change of the coupling Rabi frequency, the Airy vortex beam will be focused, and the main lobe will form a quasi-focus, accompanied by the reproduction of phase singularities. Moreover, the transverse deflection of the beam will be reduced when the coupled Rabi frequency is increased. At the same time, the vortex position, truncation factor and transverse scale also affect the field intensity distribution of the beam. These research results could have potential application value in the fields of optical bullets and optical micromanipulation.
A new application of coherent manipulation of EIT(electromagnetically induced transparency) medium is suggested,that is controlling the Brewster angle via manipulation of refractive index of electromagnetically induced transparency vapor.The EIT atomic vapor are filled on the background of two pieces glass whose refractive index is 1.5.By manipulating the refractive index of the EIT vapor via the external control field,one can obtain the controllable Brewster angle that is sensitive to the variations of external conditions(e.g.the intensity of the control field).It is shown that Controlling the Brewster angle can be achieved by choosing the specific parameters such as the Rabi frequency of control light.