PERIODIC DOMAIN INVERSION IN POLED KTIOPO4 VIA HIGH-RESOLUTION X-RAY TOPOGRAPHY AND DIFFRACTION-SPACE MAPPING

Periodic domain inversion produced by electron beam writing on the C- face of a hydrothermally grown KTiOPO4 crystal has been investigated b y high-resolution multiple-crystal topography and diffraction-space ma pping. Periodic contrast, with spacings which are consistent with the lateral dimensions of the inversion domains, has been observed by choo sing a high spatial resolution mode for topography. Via reciprocal-spa ce mapping, the scattering features along Delta q(parallel to) and Del ta q(perpendicular to) have been extracted and shown, by combination w ith high angular resolution topography, to relate to the lattice tilti ng and strain induced during the domain inversion process. The origins of the diffraction contrast in the domain inverted regions, and the f actors affecting the diffraction images of the domains are discussed.