Physicochemical nanomaterials science

Optical activity and electrooptic effect of pure and L-arginine doped KDP single crystals
Shopa Y.1, Shopa M.2, Kostenyukova E.I.3, Pritula I.M.3, Bezkrovnaya O.N.3
1 Cardinal Stefan Wyszyński University in Warsaw. Faculty of Mathematics and Natural Sciences, Wóycickiego 1/3, 01-938 Warsaw, Poland
E-mail: i.shopa@uksw.edu.pl
2 Department of Atomic, Molecular and Optical Physics, Faculty of Applied Physics and Mathematics. Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland
3 Institute for Single Crystals NAS of Ukraine, Nauky Ave., 60, Kharkov-61001, Ukraine

Potassium Dihydrogen Phosphate (KDP) and most popular deuterated (DKDP) single crystals are widely used in non-linear optics and in electro-optical applications. One of the methods for improve nonlinear optical parameters is introduction of organic molecules into the matrix of KDP crystal [1]. We investigated the effect of L-arginine (0.7, 1.4, 3.8 wt % of amino acid in the solution) on the electro-optical properties and optical activity (OA), phenomena that are characterized by large anisotropy and sensitivity to changes in the structure of KDP single crystal.
The OA in these crystals is interesting because along [100] and [010] directions it has opposite signs behind the symmetry conditions. We used a modified polarimetric methods [2] to study OA and found small differences in the absolute value of the specific optical rotations. 
Considering the improvement of the nonlinear optical characteristics [1] we investigated the effect of organic material L-arginine on the electro-optical properties of KDP single crystal. We found that the electro-optical parameters (i.e. half-wave voltage and also electro-optic coefficients r63) practically do not change in doped crystals in comparison with the pure KDP crystal. We can assume that in static electric fields the optical nonlinearity is not manifested as much as on the light wave’s frequencies.

1.	Pritula I.M., Kostenyukova E.I., Bezkrovnaya O.N. et al. KDP crystal doped with L-arginine amino acid: growth, structure perfection, optical and strength characteristics // Optical Materials. -2016. -57. P. 217-224.
2.	Shopa Y., Shopa M., Ftomyn N. Dual-wavelength laser polarimeter and its performance capabilities // Opto-Electronics Rev. -2017. -25, P. 6–9.