Optical waveguide part, production method null of second harmonic generation device and optical waveguide

摘要

PROBLEM TO BE SOLVED: To improve the light damage resistance of a ferroelectric optical single crystal substrate at the time of constituting periodic polarization inversion structures, etc., on this substrate. ;SOLUTION: The optical waveguide parts have the ferroelectric optical single crystal substrate 1 subjected to monopolarization and at least one layer of the ferroelectric optical single crystal films 9 formed by epitaxy growth. periodic structures consisting of repeating units 31 of alternately adjacent first slopes 4A and second slopes 4B are formed on the main surface 1d of the substrate 1. The period structures are so formed that the components of the direction parallel with the polarization axis 2 of the normal 6A of the first slopes 4A are made negative and that the components of the direction parallel with the polarization axis 2 of the normal 6B of the second slopes 4B are made positive.;COPYRIGHT: (C)1997,JPO