LARGE-SIZE KBe2(BO3)F3 CRYSTAL, ITS PREPARATION METHOD AND FREQUENCY CONVERTER BY USING IT

摘要

Large-size KBe<SUB>2</SUB>(BO<SUB>3</SUB>)F<SUB>2</SUB> crystal, its hydro thermal method and frequency converter by using it are disclosed and directed to synthetic crystal field. Selected mineralising agents in said hydrothermal method are hydroxide or carbonate or halide or borate or boric acid or any combination of them. The present hydrothermal method completely overcomes the layering growth tendency, realizes blocky crystal growth with crystal face, an the resulted thickness exceeds 5mm.