Raman spectra and electron microscopic investigations of the sections of modified As₂S₃ glasses

Chalcogenide vitreous semiconductors (ChVS) are used as memory elements, elements of fiber, integral and power optics [1–6]. The change of the synthesis conditions results in the change of structure and, as a consequence, physical parameters of ChVS [1]. It means that it is possible to find solution of the fabrication of glasses with high optical strength by using modification of ChVS structure [2]. The objective of the present work is to investigate the influence of the temperature-temporal conditions of the fabrication on the structure of As₂S₃ glasses by the method of the Raman scattering spectroscopy and electron microscopy and also to choose the conditions of fabrication of As₂S₃ glasses with the continuously bonded matrix of the structure suitable for power optics using this basis

Nano-sized phase inclusions in As₂S₃ glass, films and fibers based on this glass

In this report, the comparative analysis using Raman spectroscopy of the short-range order in amorphous As₂S₃ films deposited with different evaporation rates, volume glass and fiber based on this glass is presented. With increasing the film deposition rate, their structure becomes more non-uniform as compared to that of glass. Raman spectra excited by laser radiation with energy bigger than the width of the optical gap indicate photomodification of the structure of As₂S₃ glass and fiber based on it

Investigation of nanophase separation in IR optical glasses As₄₀Se₆₀ using resonant Raman scattering

Resonant Raman spectra of stoichiometric glass (g) g-As₄₀Se₆₀ have been investigated. It was observed that the increasing of excitation radiation energy hv>E₀ (E₀ is pseudogap width) changes a shape, intensity, and position of Raman peaks of g-As₄₀Se₆₀. The structure and vibration spectra of some As-Se clusters were calculated applying the ab initio method. In order to elucidate structural features of g-As₄₀Se₆₀, we combined the experimental Raman data and theoretical calculations