Abstract
In order to study these inhomogeneities, Ce-doped and undoped strontium-barium niobate (SBN) fibers were grown by a laser-heated pedestal growth (LHPG) technique in various Ce:SrxBa1−xNb2O6 compositions along both c [001] and a [100] crystallographic axes. Specific optical inhomogeneities distributed in a radial manner (core effects) are observed in such crystals. Two-dimensional scanning electron microprobe analysis (SEPMA) indicated Ba enrichment and Sr decrease in the cores. An approximate control segregation coefficient ('koA) was introduced to characterize the segregation in the fibers. For different cations 'koSr = 0.98, 'koBa = 1.04 and 'koNb = 0.99 were obtained which both determine and demonstrate the complexity of the inhomogeneities in the core in the radial direction.
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