Qualitative and quantitative bubbles defects analysis in undoped and Ti-doped sapphire crystals grown by Czochralski technique - Archive ouverte HAL Access content directly
Journal Articles Optical Materials Year : 2014

Qualitative and quantitative bubbles defects analysis in undoped and Ti-doped sapphire crystals grown by Czochralski technique

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Abstract

Small bubbles can be observed in both sapphire and Ti-sapphire bulk crystals grown by Czochralski technique (Cz). Various thickness of wafers cut from the grown ingots were studied by optical microscopy. Bubbles distribution has different regulation in sapphire and Ti-sapphire crystals. All bubbles are spherical and have a diameter range from 2 μm to 5 μm in sapphire crystals while 10–45 μm in Ti-doped sapphire crystals. Some adjacent bubbles congregated into defects present various sizes and shape. The bubbles density increases as a function of pulling rate and rotation rate. The effect of bubbles on optical characterizations of Ti-sapphire crystals has been studied.
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hal-02310820 , version 1 (10-10-2019)

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Hui Li, E. A. Ghezal, Guillaume Alombert-Goget, Gerald Breton, Jean-Marc Ingargiola, et al.. Qualitative and quantitative bubbles defects analysis in undoped and Ti-doped sapphire crystals grown by Czochralski technique. Optical Materials, 2014, 37, pp.132-138. ⟨10.1016/j.optmat.2014.05.012⟩. ⟨hal-02310820⟩
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