In Nonlinear optics laboratory at J. Stefan Institute we study new materials and their interaction with laser light.  We are especially interested in new materials which promise new applications in the following highly competitive fields: optical data storage, optical processing and telecommunications.  In 2002 we cooperated with the National Institute for Materials Science in Tsukuba, Japan, studying the optical properties of LiTaO3 and LiNbO3 crystals with various degrees of stoichiometry.  We have shown that near-stoichiometric LiTaO3 is a very promising material for nonlinear optic applications in the near-UV spectral range.  In a cooperation with the Nonlinear optics Laboratory at ETH Zurich we have been studying the optical properties of a novel organic nonlinear-optic material DAST in the region of high absorption.  In this region photobleaching with a suitable wavelength can modify the refractive index of the crystal, therefore structuring of the surface layer is possible.  This seems to be a valuable method to produce integrated optical circuits directly in bulk nonlinear materials.  Diffraction of light off polymer dispersed liquid crystal gratings were also studied in a cooperation with Brown Univ, Dept Phys, Providence.  Diffraction properties, grating anisotropy, and temperature dependencies were analyzed to obtain information on the liquid crystal orientation inside the ellipsoidal droplets and the distribution of the droplets in a polymer host.