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Abstract
Noncolinear frequency doubling (NCFD) is discussed as a sensitive technique for the characterization of acentric crystals. Two methods can be applied: ‘Spontaneous’ NCFD where light scattered at crystal imperfections is used as second fundamental beam and ‘induced’ NCFD where the usage of a second laser beam yields three-dimensional spatial resolution. Experimental investigations of pure and VTE-treated lithium niobate and of domain boundaries in potassium niobate are presented.