Continuous refill crystal growth method
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United States of America Patent
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Jan 12, 1993
Grant Date -
N/A
app pub date -
Aug 20, 1991
filing date -
Aug 20, 1991
priority date (Note) -
Expired
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Abstract
Large crystals of alkali halide materials are presently produced using the Bridgman-Stockbarger method and result in state-of-the-art crystals of up to 30' in diameter and 20' in height. Both residual impurity concentrations and dopant concentrations have been difficult to control because the segregation coefficients are not equal to unity. As a result, the residual impurity and dopant concentrations can vary drastically across the length of the crystal. By adding additional charging material to the melt during the crystallization process, the residual impurity and dopant concentrations can be kept nearly constant throughout the length of the crystal. By adding charging material to the melt during crystallization, the overall length of a manufactured crystal can be increased dramatically.
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