  We report on bulk and guided-wave second-harmonic generation via random
Quasi-Phase-Matching in Lithium Tantalate. By acquiring the far-field profiles
at several wavelengths, we extract statistical information on the distribution
of the quadratic nonlinearity as well as its average period, both at the
surface and in the bulk of the sample. By investigating the distribution in the
two regions we demonstrate a non-invasive approach to the study of poling
dynamics.
