Abstract
A series of large-size Tb3Sc2Al3O12(TSAG) single crystals of Φ40 mm * L60 mm were grown successfully by Czochralski (Cz) method with Nd:YAG as seed crystals. The formation mechanism of cracking was discussed and the results show that the reason for the crack comes from the nonuniform temperature distribution and component segregation phenomenon of Sc and Al during the TSAG crystal growth. The effective way to eliminate this temperature difference is to adopt double-layer insulation structure. By increasing of the rotation speed and accelerating the forced convection in the melt, the material distribution in the melt can be more uniform, and the influence caused by axial and radial component segregation can be weakened to a certain extent. And the as-grown TSAG crystal has good transmittance of 81% and extinction ratio over 35 dB, which means that it can well meet the current requirements for the application of magneto-optical devices.
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