Abstract
High optical quality crystals of K 2Al 2B 2O 7 (KABO) up to 50×20×17 mm 3 in size and weight of 30 g have been grown using an improved top-seeded growth method with a NaF flux. The solubility data of KABO in NaF is reported over the temperature range of 920–790°C and the effect of seed orientations on the crystal growth is investigated. Seed along (1 1 0) direction is the best choice for the growth of this crystal. The quality of the crystals was evaluated by Synchrotron topography method and a D5000 high resolution X-ray diffractometer. The conversion efficiency of the fourth harmonic generation with a specimen 3.7 mm in length reached 12.3% for Q-switched Nd:YAG lasers.
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