Light polarization effect on holographic grating recording in glassy chalcogenide a- As40S15Se45 film has been experimentally studied and compared nm with previously studied glassy molecular azobenzene film 8a at 633 using s-s, p-p, CE-1 and CE-2 circular-elliptic (differing by light electric field rotation directions) recording beam polarizations. Azocompound exhibited much higher self-diffraction efficiency (SDE) and diffraction efficiency whereas chalcogenide was more sensitive .Their recording efficiency polarization dependences also were different . SDE up to 45% was achieved in 8a with p-p and up to 2.6% in a-As40S15Se45 with CE-2 polarized recording beams . The polarization changes in the diffraction process were studied as well in these and other materials (11, 16, 19 and a-As2S3 film, LiTaO3:Fe crystal). It was found that light polarization changes in the process of diffraction from gratings recorded vectorially by s-p polarizations depended on chemical composition, wavelength and exposure time. Vector gratings with SDE up to 25% were recorded in 8a rotating a linear polarization by 900. No light polarization changes were found in azobenzene 19 and chalcogenide films and in LiTaO3:Fe crystal thus showing a vector recording of scalar holograms . The recording mechanisms in azocompounds and chalcogenides are discussed and compared.