Abstract
Second-order nonlinear optical processes are forbidden in centrosymmetric materials. Macroscopic noncentrosymmetry is traditionally achieved in materials that possess polar order, such as ferroelectric crystals or poled polymers. For frequency conversion, the generated field and the nonlinear source polarization must propagate in phase through the material (phase matching). In dispersive media, the phase relation can be maintained only over a coherence length. The phase relation can be restored, and continuous growth of the nonlinear signal achieved, by reversing the sign of the nonlinear susceptibility after each coherence length (quasi phase matching). In materials with polar order, this is done by periodically reversing the direction of the polar axis.
© 1999 Optical Society of America
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