Micro-pulling down growth of co-doped lithium niobate single crystal fibers according Er and Mg contents and photolumenescence properties

The Er3+ doped Mg:LiNbO3 single crystal fibers employed in our experiment w ere grown in air by a micro-pulling down (mu -PD) method from host material s of a congruent Li/Nb (0.945) ratio which were melt-doped with a nominal m olar concentration of 1, 3, 5 % MgO and 0.6 % Er2O3. The X-ray diffraction analysis results indicated that the co-doped crystals maintained the same s tructural characteristics as the undoped LiNbO3, however the lattice parame ters with Mg differed; c (Angstrom) value decreased, and a (Angstrom) incre ased than of pure LiNbO3. The influence of dopants on the photoluminescence (PL) properties of the Er:Mg:LiNbO3 single crystal fibers excited by laser lines of 514 nm was reported. Also, the PL properties according to tempera ture and the excitation power of Er:Mg:LiNbO3 crystal fibers were analyzed.