Abstract

Many quasi phase matching (QPM) devices have been demonstrated using domain inverted ferro-electric crystals (LiNbO₃, KNbO₃, KTP).^1,2 It is well known that some biaxial crystals such as KNbO₃, BaTiO₃, have several spontaneous polarization directions.³ If these structures can be controlled artificially, the use of these crystals in optical applications will be increased. KNbO₃ is one of the attractive crystals because of its large birefringence, non-linearity, high electro-optic constants, and low optical damages. In this paper, we describe artificial fabrication method 90-degree domain structure in the KNbO₃ single crystals.

© 2002 Optical Society of America