Equalizing disordered ferroelectrics for diffraction cancellation

We show how the cross-over effect of dipolar glasses can be used to observe diffraction cancellation in composite ferroelectric samples independently of composition. We are able to selectively frustrate the dielectric anomaly of different compositionally disordered photorefractive ferroelectrics to achieve scale-free optical propagation at one same temperature. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4751847]