Electro-optic properties of singly and doubly doped lithium niobate crystal by rare earth elements for optoelectronic and laser applicationsNune Mkhitaryan, Jean Zaraket, Ninel Kokanyan, Edvard Kokanyan and Michel AillerieEur. Phys. J. Appl. Phys., 85 3 (2019) 30502DOI: https://doi.org/10.1051/epjap/2019180317