Cesium doped KTP crystals with high optical quality have been grown using a flux growth method in various cesium content starting materials. The transmission curve showed a high transmission near UV absorption edge. The conductivity in z direction of these crystals is one order lower in magnitude than that of KTP. The phase-matching (PM) curves for SHG, SFG of CeXTP were determined. An effective blue coherent laser was obtained through SFG process using CeXTP crystal. (C) 2004 Elsevier B.V. All rights reserved.