Accession Number:

ADP011514

Title:

Raman Investigation of Structural Photoinduced Irreversible Changes of Ga(10)Ge(25)S(65) Chalcogenide Glasses

Descriptive Note:

Corporate Author:

SAO PAULO UNIV (BRAZIL)

Report Date:

2001-06-01

Pagination or Media Count:

8.0

Abstract:

The influence of time exposure, when exposed to above band gap light 3,52 eV and annealing, on Ga10Ge25S65 glasses has been studied through their effects on the structure and optical properties. To evaluate the photostructural change infrared and Raman spectra for bulk Ga10Ge25S65 glasses have been measured before and after exposure. The Raman spectra are interpreted in terms of models in which the Ge atoms are fourfold coordinated and the S atoms are two fold coordinated. The observed changes in the spectral region of S-S stretching vibration 470-49O cm 1 is a direct evidence for the occurrence of important structural changes in local bonding configuration caused by optical irradiation. It is shown that the dominant photostrucural changes are chain formation tendency of the chalcogenide atoms under the laser irradiation rather than rings.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Atomic and Molecular Physics and Spectroscopy
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE