0000000000885224
AUTHOR
A. Ozols
Effect of reflections on phase hologram recording in amorphous As-S-Se films
Experimental and theoretical studies of phase hologram recording in amorphous As-S-Se films with slightly wedge-shaped thickness profile are presented. It is shown that Fabry-Perot resonator effect caused by the interference of multiply reflected light beams inside the sample strongly changes the values of diffraction efficiency and its growth rate as well as the exposure time dependences of diffraction efficiency and transmissivity making them site-dependent and sample-dependent. Absorptivity and recording light intensity inside the sample are also significantly changed. The obtained results can be used to explain the holographic and optical experiments also in other materials with Fabry-P…
Holographic recording in amorphous As2S3 films at 633nm
Abstract Holographic grating recording with focused (light intensity I = 14–124 W/cm 2 ) and unfocused ( I = 0.50–0.78 W/cm 2 ) 633 nm He–Ne laser sub-bandgap light in non-annealed and annealed a-As 2 S 3 films has been experimentally studied. The focused light recording is found to be much more efficient (diffraction efficiency up to 14.9%, specific recording energy down to 216 J/(cm 2 %)) than the unfocused light recording (0.11%, 72 400 J/(cm 2 %)). Some other properties are also different. The hologram lifetime of more than two years and positive refractive index changes take place in the case of focused recording versus two days and negative refractive index changes for unfocused r…
DEVELOPMENT OF LIQUID CRYSTAL LAYER THICKNESS AND REFRACTIVE INDEX MEASUREMENT METHODS FOR SCATTERING TYPE LIQUID CRYSTAL DISPLAYS
The research has been supported by ERDF No.1.1.1.1/19/A/120 “Improvement of Electro-Optical Characteristics of Liquid Crystal Shutters”.