Abstract
The incorporation of bubbles in ruby single crystals grown by the floating zone method with an infrared radiation convergence type heater was investigated by the Experimental Design Method. The effect of experimental parameters when making specimens or pulling ruby single crystals on bubble formation was analyzed to obtain bubble-less ruby single crystals. It was found that crystal diameter, growth rate, atmosphere during the growth of crystals and sintering conditions had a large influence on bubble formation. These parameters were effective in reducing the bubble density. The model proposed that gas constituents were being rejected from the solidified melt at the interface was consistent with experimental results.
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