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  • 2013 Conference on Lasers and Electro-Optics - International Quantum Electronics Conference
  • (Optica Publishing Group, 2013),
  • paper CI_P_4

Free-space optical polarization demultiplexing and multiplexing by means of conical refraction

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Abstract

We present a novel method to demultiplex and multiplex a monochromatic input light beam into, in principle, an arbitrary number of polarization states by means of the conical refraction (CR) phenomenon [1-4]. In CR, when a focused Gaussian beam passes along the optic axis of a biaxial crystal it its transformed into a light ring at the focal plane of the system (or ring plane) [2,4]. Angular amplitude masks forming a star burst like pattern with n (up to 12) opened circular sectors placed at the ring plane allow passing only some sectors of the ring. These sectors form our communication channels. A second biaxial crystal identical to the first one and placed after it with opposite orientation of its plane of optic axes multiplexes the selected channels into a single beam, similar to the input Gaussian one. Finally, a third biaxial crystal is used to decode the transmitted channels at the receiver stage.

© 2013 IEEE

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