Presented are the results of experimental investigations of a resonant doubler of CW radiation frequency that uses a novel non-linear optical crystal BIBO. For the first time by using this crystal in an external resonator a stable singlefrequency generation of the second-harmonic radiation was achieved with the output power of 270 mW at the wavelength of 425 nm. Conversion efficiency is as high as 36%. Generation instabilities were observed at second harmonic power higher than 300 mW inside the doubler cavity.

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