Abstract
High quality oxide bulk and fiber crystals have been successfully grown by applying advanced single crystal growth methods. REVO4 single crystals have been grown by a modified Czochralski method in which a high temperature gradient was maintained at the interface during growth. Nd:GdVO4 single crystals showed superior lasing properties than those of Nd:YVO4 and Nd:YAG single crystals in slope efficiency, threshold pump power and output power. Birefringence of REVO4 were more than 0.22. High concentration Nd3+ ions doped NaRE(WO4)2 (RE=Y, Gd) single crystal fibers were grown. Stimulated Raman scattering spectra of undoped NGW fiber was measured, and the Raman shift was observed to be larger than that of KGW. Nd3+ doped fibers showed superior optical properties such as high doping level and large stimulated Raman scattering shift for efficient multicolor laser. Crack-free and homogeneous K3Li2−xNb5+xO15+2x fiber crystals were grown with various pulling down rates. The crystals showed an excellent second harmonic generation properties.
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