WAVEGUIDE TYPE SHG ELEMENT HAVING PARTIAL POLARIZATION INVERSION STRUCTURE AND ITS PRODUCTION

摘要

PURPOSE: To obtain the waveguide type SHG element having a high conversion efficiency without degrading the intrinsic characteristics possessed by LiNbO₃, and without optical damages. ;CONSTITUTION: This waveguide type SHG element consists of an LiNbO₃ single crystal 2 or the LiNbO₃ single crystal having the partial polarization inversion regions constituted by forming the partial polarization inversion regions 5 where only the non-diffused parts of MgO are inverted on the +c surface within the respective waveguides of the LiNbO₃ single crystal thin film formed on an LT substrate. This is subjected to an inversion treatment at the temp. between the Curie point of the LiNbO₃ single crystal diffused with the MgO and the Curie point of the LiNbO₃ single crystal not diffused with the MgO, by that the domains of the undiffused parts are inverted.;COPYRIGHT: (C)1993,JPO&Japio