Domed Sapphire Crystal Grown by The Gradient Freezing Method (GSM)

Describes a sapphire single crystal growth, in a dome shape, the gradient freezing method (GSM). Molybdenum is used in a double-walled crucible planted near net shape geometry. This significantly shortens the final size of the dome to the manufacturing process, thereby reducing costs. This process is used with a different shape (hemispherical, etc.), size (maximum diameter 6 inches) and a crystal orientation (including the optical axis) Growth dome. The growth rate of the thermal field and control the grain boundaries and prevent scattering centers is very important, and for the prevention of the action of surface tension generated geometric distortion.

Gradient freeze (GSM) is for large, high-quality single-crystal sapphire and calcium fluoride growth. Several growth parameters (eg, thermal gradient, stability, growth rate and the quality of the thermal field in the starting material) of the quality of the grown crystal was studied correlation. Growth of several types of defects are analyzed to clarify its nature. Crystals characterized by its crystalline and optical properties.

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