Competition between photorelaxation and photoexcitation in chalcogenide glasses and the effect of aging

• Published in: Journal of non-crystalline solids 2011-02, Vol.357 (3), p.888-892
• Main Authors: Lin, Fang-Yin, Lucas, Pierre
• Format: Article
• Language: English
• Subjects: Annealing; Bragg reflectors; Chalcogenide glass; Competition; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Differential scanning calorimetry; Exact sciences and technology; Glass; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Photodarkening; Photoexcitation; Photorelaxation; Photostructural changes; Physics; Piezo-, elasto-, acoustooptical, and photoacoustic effects
• ISSN: 0022-3093; 1873-4812
• DOI: 10.1016/j.jnoncrysol.2010.11.097

Measurements of transient photodarkening and permanent Bragg reflector formation were performed on fragile As 18S 65Se 17 glass and indicate that photodarkening and photorefraction can only be induced in previously aged glasses while they are prevented in freshly annealed glasses. These phenomena are associated with the photorelaxation process that is revealed to be prominent in fresh glasses and is shown to effectively anneal out the defects produced during photoexcitation thereby resulting in no net permanent changes in the structure. On the other end, aged glasses do not undergo any photorelaxation and exhibit large transient and permanent changes associated with an increase in structural enthalpy as confirmed by Differential Scanning Calorimetry. These results demonstrate that photorelaxation can be a significant problem in fragile glass compositions as it cancels out the effect of photoexcitation and impedes the photodarkening and photorefractive process. Measurements of transient photodarkening and permanent Bragg reflector formation were performed on fragile As 18S 65Se 17 glass and indicate that photodarkening and photorefraction can only be induced in previously aged glasses while they are prevented in freshly annealed glasses. These results demonstrate that photorelaxation can be a significant problem in fragile glass compositions as it cancels out the effect of photoexcitation and impedes the photodarkening and photorefractive process. [Display omitted] ► Photostructural changes are measured on fragile As 18S 65Se 17 glass. ► Photostructural changes are prevented in freshly annealed glasses. ► Photostructural changes are present in previously aged glasses. ► DSC indicates competition between photorelaxation and photoexcitation. ► Photorelaxation prevents photostructural changes in fragile glass.