Optical Investigations of Periodical Domain Structures Created by E-Beam Irradiation in Y-Cut LiNbO3

We report the results of optical investigations of planar periodical domain structures fabricated by a set of quasi-point e-beam irradiations both on a Y-cut congruent LiNbO3 substrate and on the planar Ti-indiffused waveguides that have been formed on such substrates. The quasi-phase-matched second harmonic generation (SHG) on domain gratings with period of 7 μm has been obtained with the conversion efficiency 8.8%. A quality of the planar domain gratings was estimated by SHG-microscopy and light scattering.