Photoelectric fields in lithium niobate single crystals doped by zinc and boron

The values of the photovoltaic (Epv) and diffusion (ED) fields were calculated for LiNbO3stoich, LiNbO3cong, LiNbO3 : Zn (0.04–2.01 mol. % ZnO in the crystal) and LiNbO3 : B (0.55 and 0.83 mol. % B2O3 in the charge) crystals according to the parameters of the indicatrix of photoinduced light scattering. It is shown that the ED contribution to the optical damage is maximum for LiNbO3stoich crystal. This indicates an increased concentration of shallow electron traps in LiNbO3stoich as compared to other studied crystals.