Two-dimensional all-optical spatial light modulation with high speed in coherent media
Department of Physics, University of Connecticut, Storrs, CT 06269, USA.Optics Letters (Impact Factor: 3.29). 08/2009; 34(13):1930-2. DOI: 10.1364/OL.34.001930
We show theoretical evidence that coherent systems based on electromagnetically induced transparency (EIT) can function as optically addressed spatial light modulators with megahertz modulation rates. The transverse spatial properties of cw probe fields can be modulated fast using two-dimensional optical patterns. To exemplify our proposal, we study real-time generation and manipulation of Laguerre-Gaussian beams by means of phase or amplitude modulation using flat-top image-bearing pulse trains as coupling fields in low-cost hot vapor EIT systems.
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ABSTRACT: We show how well-developed saturated absorption spectroscopy could be adopted for subdiffraction propagation of optical images. We employ pump beams with appropriate spatial profiles that produce controllable inhomogeneous absorption and dispersion of the medium. We discuss advantages of using super-Gaussian and Laguerre-Gaussian pump beams.Optics Letters 10/2009; 34(20):3199-201. DOI:10.1364/OL.34.003199 · 3.29 Impact Factor
Conference Paper: An optoelectronic expert system for knowledge base systems[Show abstract] [Hide abstract]
ABSTRACT: In this paper a parallel optoelectronic computer architecture is proposed for expert systems in order to achieve high speed and high performance for parallel processing of rule-based systems. The proposed system is modeled and implemented using a two-dimensional space optics symbolic correlator to perform the comparison operations of the expert system. Also in this paper, an optoelectronic system for a parallel inference engine is presented. The proposed optical inference engine is able to perform 3D processing for inferring conclusions to queries by representing knowledge (facts and rules) in 2D space using a matrix-like formulation. The proposed structure of the inference machine is based on rule-driven and query-driven control flows using mapped-template logic. A hardware realization for these systems based on commercially available components is discussed. The performance analysis of the proposed system shows its remarkably improved performance compared with electronic systems.10th International Conference on Intelligent Systems Design and Applications, ISDA 2010, November 29 - December 1, 2010, Cairo, Egypt; 01/2010
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ABSTRACT: Based on the theory of electromagnetically induced transparency, we study the formation of all-optical blazed transmission gratings in a coherently driven three-level atomic system using intensity-modulated images in coupling fields. Also, we analyze the feasibility of high-speed (megahertz) modulation for the induced gratings by means of image-bearing flat-top pulse trains. Consequently, continuous-wave probe fields can be efficiently and rapidly deflected in free space. When more sophisticated images are adopted, our scheme can provide further possibilities of all-optical beam splitting and fanning.Physical Review A 07/2010; 82(1). DOI:10.1103/PhysRevA.82.013809 · 2.81 Impact Factor
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