Pure KDP single crystals and KDP crystals doped with TiO(2) nanocrystals were grown by the method of temperature reduction from aqueous solutions. Adsorption of the phosphate-ions on the surface of TiO(2) particles was studied by FTIR spectroscopy. It was shown that the nanoparticles with adsorbed H(2)PO(4)(-) and (H(2)PO(4))(2)(2-)anions were incorporated predominantly into the positively charged face (1 0 1) of the pyramidal sector of MOP. High-resolution X-ray three-crystal diffractometry (TCD) investigation of the as grown samples of KDP+TiO(2) revealed the presence of the turns of the growth layer "stacks" up to 3 arcsec in the growth sectors {1 0 0} and (1 01). The observed thickness of these "stacks" was of the order of 20-30 mu m. For KDP+TiO(2) crystals there was found a relative change of the crystal lattice parameter (Delta d/d) caused by incorporation of TiO(2) nanoparticles into the boundaries of the growth layers. This gave rise to the formation of a semicoherent binding on the interface between the captured TiO(2) and the matrix. No essential influence of the nanoparticles on the laser damage threshold of MOP with 10(-5) wt.% of TiO(2) was established. (C) 2011 Elsevier B.V. All rights reserved.