Ruby Crystals Grown by the Czochralski Technique

Abstract
Ruby crystals were grown by the Czochralski technique by using an induction-heated iridium crucible in various atmospheres. The crystals are grown along directions of the a- and c-axes and of 60° from the c-axis. The crystal on the whole is free from residual stresses, in contrast to the remarkable and irregular stresses usually found in crystals grown by the Verneuil technique. Laser oscillation were observed in the pulled crystals.

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