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Frontiers in Optics

Optical Image Cloning based on Electromagnetically Induced Absorption

Shamaila Manzoor, Ulices Fernandez Apolinario, Luı́s E. E. de Araujo

Published Jan 1, 2016• 0 citations
Publisher

Abstract

We experimentally demonstrate, for the first time, imaging cloning of the spatial profile of a strong coupling beam onto that of a weak probe beam via electromagnetically induced absorption in a warm Rb vapor cell.
DOI
10.1364/fio.2016.jth2a.25

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•Oct 29, 2011•0 citations
We investigate, both theoretically and experimentally, optical image cloning via electromagnetic induced absorption (EIA). We demonstrate the transfer of small 2D real images imprinted onto a strong coupling beam to a weak probe beam in a Rb vapor cell. We show through EIA that the coupling beam's image is cloned beyond the usual diffraction, with a potential improvement in spatial resolution of the cloned image by a factor of three in comparison to that of the original coupling beam. Optical cloning through EIA is based on position selective nonlinear absorption, and it does not rely on spatial modulation of the refractive index.
We show how quantum coherence effects can be used to improve the resolution and the contrast of diffraction-limited images imprinted onto a probe field. The narrow and sharp spectral features generated by double dark resonances (DDR) are exploited to control absorption, dispersion, and diffraction properties of the medium. The spatially modulated control field can produce inhomogeneous susceptibility of the medium that encodes the spatial feature of the control image to probe field in the presence of DDR. The transmission of a cloned image can be enhanced by the use of an incoherent pump field. We find that the feature size of the cloned image is four times smaller than the initial characteristic size of the control image even though the control image is completely distorted after propagation through a 3-cm-long Rb vapor cell. We further discuss how spatial optical switching is possible by using induced transparency and absorption of the medium.
We observe resonances with width 20 times below the natural linewidth for a probe laser on an optical transition, when the same transition is driven by a control laser with a Laguerre-Gaussian (LG) profile. The basic mechanism is the phenomenon of electromagnetically induced transparency and absorption (EITA). Aligning the Gaussian probe beam to the central hole in the LG control beam simultaneously allows a strong control intensity required for high signal-to-noise ratio and a low intensity in the probe region required to get narrow resonances. We observe these resonances on the D2D_2D2​ line of Rb in a room-temperature vapor cell and show that the linewidth is reduced by a factor of 4 compared to the use of a Gaussian control beam, which should prove advantageous in all applications of EITA.