The main goal of this proposal is development of new production technology for most efficient and more stable application of crystalline materials as active elements of electro-optic or nonlinear optical cells, especially for control and/or conversion of superpowerful laser radiation. In the framework of such technology it is proposed to create new electro-optic interferometric setup and modernize existing nonlinear optical setup as well as to develope the necessary fundamental methodology being suitable for precise determination and calculation of complete sets of electro-optic tensor coefficients or nonlinear optical second order susceptibilities in crystalline materials of different symmetry. Using these setups author plans to study the electro-optic and nonlinear optical characteristics of doped lithium niobate and borate family crystals or other low symmetry prospective inorganic/organic crystalline materials. It is therefore expected to derive for these materials a complete tensor sets of electro-optic or nonlinear optical coefficients that will represent input parameters for further 3D-analysis of spatial anisotropy of investigated effects using constructed indicative surfaces and their stereographic projections. On this basis the global maxima of electro-optic or nonlinear optical effects for selected crystals will be determined and for these maxima their angular stability will be calculated using improved own software. In the final step it is planed to design the laboratory prototype of such cell suitable for more efficient and stabil control or conversion of superpowerful laser radiation made of mentioned above crystalline materials. Thus it will be a significant contribution in development of new production technology for most efficient and more stable application of electro-optic and nonlinear optical crystalline materials.