Optimized conditions for the growth of lanthanoids orthoniobates (LnNbO 4 , Ln = lanthanide elements) single crystal minirods by a floating zone technique were investigated. Adequate atmospheres and pulling to feeding speed ratios to grow these materials were determined. Emphasis is given to the study of LaNbO 4 because of their more favorable growth conditions and crystalline quality. This material can be efficiently doped with rare earth elements such as erbium. It grows with high crystallinity and its preferential growth direction is [1 1 0]. A preliminary evaluation of optical properties of Er 3+ -doped LaNbO 4 single crystal under the JuddOfelt formalism indicates spectral parameters Ω t close and even larger than for Er 3+ ions in YVO 4 .
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