The basic scientific researches executed in a department, have the of principle value and make large scientific and practical interest. So, in a department first still in the middle of 60th years lasers on the set of the mixed homogeneous semiconductors of group A2V6(CdSxSe1-x; InxCd1-xS; InxCd1-xSe; CdSexTe1-x) at dvofotonnomou excitation were created, which provided frequency alteration of generation in all visible and fellow creature ultraviolet regions of spectrum (M.S. Brodin, V.Ya. Reznichenco, S.I. Shevel, P.I. Boudnic, D.B. Goer).

The methods of nonlinear spectroscopy of dvofotonnogo absorption and nonlinear refractometrii, which allowed to measure actual and imaginary part of nonlinear receptivity and its anizotropiyo in the wide set of semiconductors A2B6, are developed; A2B6-A3B5; A4B4 and to learn nature of their nonlinear. By works of department from a nonlinear optics a new scientific direction is developed - nonlinear cristaloopticou semiconductors, within the framework of which research of the nonlinear phenomena of samofocousirovci, samodefocousouvannya, samodifractsii, rotation of wave front and transversal optical bistabilnosti is first conducted in semiconductors (A.O. Borsch, M.S. Brodin, V.I. Volcov, V.Ya. Gayvoronsciy, V.Ya. Reznichenco).

The fundamental cycle of the pretsiziynih measuring of optical descriptions is executed in the region of ecsitonnogo absorption of crystals, which, in particular, experimentally led to existence of the in a theory foreseen S.I. Pecarom additional light waves. The spatial division of pecarivscih waves, that have identical frequency and polarizes is first carried out, but different indexes of refraction. Definite granitsi of application of fundamental laws of classic cristalooptici - correlation Cramersa-Croniga and formulas of Frenelya -do environments in which spatial dispersion of the dielectric penetrating is substantial (M.S. Brodin, M.I. Strashnicova, S.V.Marisova, N.O.Davidova, V.V. Black).

Research of the ecsitonnih phenomena, that arise up at the high levels of excitation is developed - so called collective processes - which allowed first to look after in the stratified crystals of PbI2 formation of ecsitonnoi liquid, and in the crystals of InSe - electron-dircovoi plasma (M.S. Brodin, I.V. Blonsciy, V.V. Tishenco, M.I. Strashnicova, M.I. Volovic)

In robots Borsha A.O. with employees there was anomalous the large value of cube nonlinear receptivity in new organic polymers on the basis of epocsidiv. In robots Tishenca V.V. it is shown with employees, that ecsitoni in nadouzcih quantum pits on the basis of ZnSe can be considered as cvazichastinci in the izotropnomou environment of fractional dimension which is determined by the degree of anizotropii of coulomb co-operation. In robots Shevelya S.G. and Voznogo V.L. the size quantum is first registered in luminescence and absorption of a new system "PlI2/tseolit LTL".