Photorefractive spatial solitons have been recently implemented to achieve electro-optically activated beam manipulation functions, such as intensity modulation and two channel routing, the devices themselves self-integrated in the bulk. The basic idea is to first generate a soliton in an otherwise homogeneous crystal, and then to use the refractive index pattern to guide longer wavelength, nonphotorefractively active, beams, for which it is effectively permanent. At this stage, a quadratic electro-optic response allows the activation and alteration of the original pattern, by changing the external bias, a process which provides device functionality during readout. This is the result of the beating between the traces of the soliton-supporting space-charge field and the now controlling external bias.
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Claudio Crognale and Luigi Rosa,
“Vector Analysis of
the Space-
Charge Field in Nonconventionally Biased Photorefractive Crystals”, Journal of Lightwave Technology, Vol. 23, No. 6, pp. 2175-2185, June 2005. |
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Claudio Crognale and Luigi Rosa,
“Non-conventional biasing scheme for re-configurable bulk
optical beam polarization converters based on
centrosymmetric photorefractive crystals”, U.S. Patent,
pending.
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For a complete list of publications concerning spatial soliton-based applications please visit http://edelre.tripod.com/thebircuitpage/id9.html . In order to obtain the complete source code for the numerical simulation of photorefractive crystals please click here. For any further information please email us.
