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23 January 2002 Contradirectional two-wave mixing in bulk and multimode fibers of iron doped lithium niobate
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Contradirectional two-beam coupling was achieved using a single laser beam incident on fibers grown from congruent iron doped lithium niobate using the laser heated pedestal growth technique. To our knowledge, this is the first time that a grating has been written in a fiber using a single laser beam and its Fresnel reflection in a 180 degree(s) contradirectional two-beam coupling geometry. Beam-coupling efficiencies were compared as a function of beam spot size for fibers and bulk crystals. At small spot sizes, the fibers outperformed the bulk crystals by reducing the diffraction effect.
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Mohammad A. Saleh, Dean R. Evans, R. N. Shariff, Timothy Paul Pottenger, Lizhu Lu, Richard Stephen Meltzer, William M. Yen, Timothy J. Bunning, and Shekhar Guha "Contradirectional two-wave mixing in bulk and multimode fibers of iron doped lithium niobate", Proc. SPIE 4459, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications VII, and Optical Data Storage, (23 January 2002);

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