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Artigo Científico | Geral Físico-química | Inglês | 05/12/2002
Autores: A.C. Hernandes, L.C. Caraschi, M.R.B. Andreeta
Palavras-chave: crystal growth, diameter control, lhpg, single crystal fiber
Resumo: We described an automatic diameter control system (ADC), for the laser heated pedestal growth technique, that reduces the diameter fluctuations in oxide fibers grown from unreacted and non-sinterized pedestals, to less than 2% of the average fiber diameter, and diminishes the average diameter fluctuation, over the entire length of the fiber, to less than 1%. The ADC apparatus is based on an artificial vision system that controls the pulling speed and the height of the molten zone within a precision of 30 mm. We also show that this system can be used for periodic in situ axial doping the fiber. Pure and Cr3+ doped LaAlO3 and pure LiNbO3 were used as model materials.
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