We have been able to grow, under steady state conditions, titanium doped sapphire single crystal fibers using the micro pulling down technique. The Ti:Sapphire obtained fibers have good morphological and optical quality. The x-ray diffraction confirms that we obtained a monocrystalline structure of Al₂O₃ in the phase Alumin-a and free from defects. The growing conditions are very stable for fibers of different diameters and at different pulling rates. The obtained fibers are homogeneous and have stable diameter. The minimization of segregation of titanium is realized through the optimization of the growing conditions (drawing rate, the heating power and the titanium concentration). In fact the segregation has been minimized using high pulling rates. The optical characterization of the drawn fibers shows that they have good transparency and they have a homogeneous radial and longitudinal distribution of Ti³⁺. Furthermore the small size diameters minimize the segregation of titanium ions Ti³⁺ in the sapphire host. The decay curves shows a life time of the order of 3 µs which is conform to the standard laser applications requirements. This study shows that the micro pulling down μ-PD technique helps to avoid many of crystal deficiencies and allows growing high quality crystals. This work confirms the importance of crystalline fibers as good candidates in the design of new photonic devices for laser application. 

1. POSTER: Segregation study of titanium ions in sapphire single crystal fibers grown by the µ-PD technique, PDF document, version 1.5, 0.9MB

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