Effect of the substitution of S for Se on the structure and non-linear optical properties of the glasses in the system Ge0.18Ga0.05Sb0.07S0.70-Se-x(x)
Abbreviated Journal Title
J. Non-Cryst. Solids
infrared glasses; chalcogenides; optical properties; non-linear optics; Raman spectroscopy; RAMAN-SPECTRA; AMORPHOUS-SEMICONDUCTORS; CHALCOGENIDE GLASSES; REGION; Materials Science, Ceramics; Materials Science, Multidisciplinary
Glasses in the system Ge-Ga-Sb-S/Se have been elaborated with different S/Se ratios in order to increase the non-linear optical properties of these glasses. We report results of a systematic study examining the relationship of the physical properties to the structure of the glasses in the system Ge0.18Ga0.05Sb0.07S0.70-xSex with x = 0, 0.02, 0.05, 0.10, 0.20, 0.30 and 0.40 where the replacement of S by Se has been made. The non-linear refractive index has been measured using the Z-scan technique, with picosecond pulses emitted by a 10 Hz Q-switched mode-locked Nd-Yag laser at 1064 nm under conditions suitable to characterize ultrafast non-linearities. The decrease of the glass transition temperature, the increase of the non-linear refractive index and of the density with the progressive replacement of S by Se have been correlated along with the red shift of the absorption band gap, to associated structural reorganization. A corresponding progressive decrease of corner-sharing GeS4/2 and the formation of mostly two edge-sharing Ge2S4S2/2, S3Ge-S-GeS3 as well as mixed GeS4-xSex units have been identified by Raman spectroscopy. (c) 2006 Elsevier B.V. All rights reserved.
Journal of Non-Crystalline Solids
"Effect of the substitution of S for Se on the structure and non-linear optical properties of the glasses in the system Ge0.18Ga0.05Sb0.07S0.70-Se-x(x)" (2006). Faculty Bibliography 2000s. 7884.