Steering, splitting, and cloning of an optical beam in a coherently driven Raman gain system

Onkar N. Verma and Tarak N. Dey
Phys. Rev. A 91, 013820 – Published 12 January 2015

Abstract

We propose an all-optical antiwaveguide mechanism for steering, splitting, and cloning of an optical beam without diffraction. We use a spatially inhomogeneous pump beam to create an antiwaveguide structure in a Doppler broadened N-type four-level Raman gain medium for a copropagating weak probe beam. We show that a transverse modulated index of refraction and gain due to the spatially dependent pump beam hold the keys to steering, splitting, and cloning of an optical beam. We have also shown that an additional control field permits the propagation of an optical beam through an otherwise gain medium without diffraction and instability. We further discuss how finesse of the cloned images can be increased by changing the detuning of the control field. We arrive at similar results by using homogeneously broadened gain media at higher density.

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  • Received 22 September 2014

DOI:https://doi.org/10.1103/PhysRevA.91.013820

©2015 American Physical Society

Authors & Affiliations

Onkar N. Verma* and Tarak N. Dey

  • Department of Physics, Indian Institute of Technology Guwahati, Guwahati 781 039, Assam, India

  • *onkar@iitg.ernet.in
  • tarak.dey@iitg.ernet.in

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Vol. 91, Iss. 1 — January 2015

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