Cascading the second-order susceptibility in poled polymers by quasi-phase matching

Summary form only given. The development of all-optical switches based on organic polymers is of great interest in photonics. An effective nonlinear coefficient may be obtained by cascading of the second-order nonlinear susceptibility. A large /spl chi//sup (2)/(2/spl omega/;/spl omega/,/spl omega/) effect and quasi-phase-matching is achieved in polymeric waveguides by a spatially periodical electric poling field in direction of light propagation. We have calculated numerically the change of intensity and of the nonlinear phase shift of the fundamental frequency wave for a waveguide of given length as a function of the phase-mismatch and the "gain amplitude".