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Cesium triborate (CsB3O5) is expected to be an efficient harmonic generator in the UV region. However, as-grown single crystals of CsB3O5 often contain a high density of optical scattering centers that significantly reduce device performance. We found that these can be removed by a post-growth heat treatment with quenching. Treated crystals were employed for the third harmonic generation of a high-power Nd:YAG laser operating at 1064 nm. We generated high-power 355-nm output power of 14 W, which is three times higher than that obtained by a commercial LiB3O5 crystal under the same experimental conditions.

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