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25 October 1996 Segregation and inhomogeneities in photorefractive SBN fibers
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Ce doped and undoped SrxBa1-xNb2O6 (SBN) fibers grown by the laser heated pedestal growth (LHPG) technique in Stanford University were investigated by 2D scanning electron microprobe analysis. The SBN fibers grown along c [001] or a [100] axes often show radially distributed optical inhomogeneities (core effects) of varying magnitude. Ba enrichment and Sr reduction were primarily detected in the core which can be qualitatively described by a complex-segregation effect. This defect structure as a complex-congruency related phenomenon modified by the composition-control mechanism of LHPG system. Its radial dependence of effective segregation coefficient is described by the modified Burton-Prim- Slichter equation.
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Sandor Erdei, Ludwig Galambos, Isao Tanaka, Lambertus Hesselink, Frank W. Ainger, Leslie Eric Cross, and Robert S. Feigelson "Segregation and inhomogeneities in photorefractive SBN fibers", Proc. SPIE 2849, Photorefractive Fiber and Crystal Devices: Materials, Optical Properties, and Applications II, (25 October 1996);

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