Abstract
Crystals of K2(Al0.71Ga0.29)2B2O7 (KAGBO) with dimensions up to 20×15×10mm3 have been grown with NaF flux by the top-seeded solution growth method. The structure of KAGBO crystal is analog to its parent compound K2Al2B2O7 and belongs to the space group P321 with cell parameters of a=8.5700(12) Å and c=8.524(3) Å. Both theoretical calculation based on the structure and powder second-harmonic generation (SHG) test reveal that KAGBO has a slight smaller SHG coefficient d11 as that of KABO or KH2PO4 (KDP). KAGBO crystal also shows a wide transparency range from 189 to 3000nm and its measured refractive indices indicate that KAGBO can be phase matched to 234.7nm for type I SHG.
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