We investigated CsLiB6O10 (CLBO) crystal growth in a dry atmosphere and from a stoichiometric melt composition with the aim of obtaining CLBO crystals containing low levels of water as an impurity. We qualitatively compared the amounts of water incorporated into CLBO crystals using a FT-IR spectrometer. It was found that CLBO crystals grown under the above conditions included a lower level of water than those grown in an ambient atmosphere from B2O3-poor solution. (C) 2009 Elsevier B.V. All rights reserved.