Abstract
In order to unravel the relation of the nanostructure of Cr4+:Y3Al5O12 (Cr4+:YAG) crystal fibers controlled by the laser-heated pedestal growth (LHPG) technique with different growth conditions, the nanostructural analysis of Cr:YAG crystal fiber was investigated by high-resolution transmission electron microscopy (HRTEM), which offers nano-scale information in the core region and inner/outer cladding interface and the mechanism of inter-diffusion process during growth. HRTEM analysis indicates that the core has high crystallinity and a sharp core/inner-cladding interface. γ-Al2O3 nanocrystals were formed during YAG/SiO2 inter-diffusion. To further enhance the Cr4+ concentration in YAG crystal fiber, the Cr4+ ions were replenished using an electron gun to deposit Cr2O3 and divalent-ion oxide (CaO or MgO) on the source rod circumference before LHPG. It was observed that Ca2+ diffuses into the source rod more efficiently than Mg2+, while generating fewer defects and stacking faults.
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