GROWTH OF MGO DOPED LINBO3 SINGLE-CRYSTAL FIBERS BY A NOVEL DRAWING DOWN METHOD

MgO-doped LN (LiNbO3) fibers were automatically grown by an improved drawing down method. The smallest fiber diameter ever attained was 10-mu-m and the fluctuation in diameter was reduced to +/- 0.2-mu-m. The poling process was done during the growth process by the thermal electric effect. The dislocation which was observed in the X-ray topographs of the optical grade bulk crystals did not appear in the fiber. The fibers and optical grade bulk crystals did not have a uniform distribution of the MgO concentration as determined by electron probe micro analysis (EPMA).