The method of high resolution for visualization of domain structures has been developed, the dependencies of domain formation and geometrical parameters on irradiation conditions by a beam of charged particles in various crystals of lithium niobate family have been investigated, calculation of spatial distribution of electric fields after irradiation of lithium niobate crystals by an ion beam has been carried out.
The formation of isolated domains and the effect of the instability of the domain wall shape after irradiation of lithium tantalum by ion beam crystals is investigated. The basic dependencies of geometrical parameters and interaction of growing domains from irradiation conditions are obtained.
The optimal parameters of formation of periodical domain structures (PDS) with short periods (less than 2 microns) for parametric light generation and conversion of laser light frequency are established for lithium niobate and lithium tantalum crystals. A physical model of switching the direction of polarization and the formation of domains utilizing the irradiation of ferroelectric crystals by a focused ion beam is proposed. Influence of surface electrostatic charging on uniformity and geometrical characteristics of PDS is investigated. Methods for compensation of excessive surface charge are proposed and their efficiency is investigated.