Blagoeva B.Nedelchev L.Mateev G.Stoykova E.Nazarova D.2024-07-102024-07-102024-07-102024-07-102020-01-011996-756X0277-786X10.1117/12.2555756SCOPUS_ID:85085241810https://rlib.uctm.edu/handle/123456789/591We present a study of the diffraction efficiencies of polarization holographic gratings recorded in thin films of the azopolymer PAZO (poly[1-[4-(3-carboxy-4-hydroxyphenylazo) benzenesulfonamido]-1,2-ethanediyl, sodium salt]). Two series of layers have been prepared using two different solvents - distilled water and methanol. The gratings are inscribed by two plain waves with orthogonal circular polarizations (left and right circular) from a He-Cd gas laser (442 nm) at recording angle 20°, corresponding to grating period 1.3 μm. Higher diffraction efficiency is obtained for the thin film samples spin-coated from the methanol solution for thicknesses below 600 nm. Diffraction efficiency higher than 27% was achieved, as well as surface relief height more than 500 nm.enConference Paper