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High-average-power fourth-harmonic generation (4thHG) of an Nd:YAG laser is achieved with a RbBe2BO3F2 (RBBF) costal.A maximum output power of 3 W at 266nm is obtained.To our knowledge,this is the first time that efficient 4th HG is realized with RBBF.The angular bandwidth of 4th HG is also measured.