Bondarenko O. Small-angle scattering and it's using for investigation of origin and development of spontaneous gratings in the lightsensitive AgCl-Ag films

Subject of investigations: thin lightsensitive composite films AgCl-Ag. The aim: demonstrate the influence of linearly and circularly polarized radiation on formation the spontaneous gratings (SG) in thin films AgCl-Ag under the action different incidence of laser beam; elucidation the possibility of using the small-angle scattering (SS) for investigation of origin and development of SG; determination the influence of ТЕ0- и ТМ0- mode competition on formation of SG. Мethods: films are prepare by thermal vacuum evaporation method . The thickness were measured by interfermetric method. Samples were irradiated by beams with different polarization from He-Ne laser. The period of SG were measured by diffractional method. SS patterns were registrated by photographic method. The analysis of SS was carry out by use Evald’s polar diagram and equation. Results, novely: The role of SS in identification of different initial and secondary SG was shown. It is calculated a set of "magic" incidences of induced beam when the amplification of rise of different initial and secondary SG was appeared. It is found formation of hexagonal symmetry patterns in films AgCl-Ag under the successive action of linearly and circularly polarized beam at normal incidence on sample by means of SS. It is found hexagonal symmetry patterns formed in the narrow interval of incidence under the action P-polarized beam at ТЕ0- и ТМ0-waveguide mode competition. Area of use: optics, laser physics.