The growth and characterization of chromium doped potassium niobate fibers
Gilchrist, Jason Patrick
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Iron (Fe) doped KNbO3 is widely used as a photorefractive material for the visible spectral range. Recent calculations by the Dennis group at UGA suggest that chromium doped KNbO3 would be suitable for photorefractive applications in the near infrared region. In this research project we attempted to grow chromium doped KNbO3 single crystal fibers and optically characterize the obtained samples to experimentally verify these predictions. The goal of this thesis was to use the Laser Heated Pedestal Growth Method (LHPG) to synthesize single crystalline fibers. LHPG is a technique where fibers are pulled from a molten zone that is created by a CO2 laser. Using polycrystalline KNbO3 and Cr2O3 powders as starting material, we find that the starting materials decompose and yield mostly Niobium dioxide NbO2.