Optically trapped delayed elasticity in germanium selenide glass fibers

Yann Gueguen, Asma Dergal, Khadidja Rahmoun, Vincent Keryvin, Bruno Bureau, Pierre Lucas, Jean Christophe Sangleboeuf

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Chalcogenide glasses undergo viscosity decrease under light irradiation (“photofluidity”). This effect has been known and investigated for many years now. Nevertheless, what is less well known, is that light irradiation impacts the whole viscoelastic behavior, and especially the delayed elasticity (or “anelasticity”). We investigate here the impact of light irradiation on delayed elastic recovery and compare it to the effect of temperature jumps. We show that photoinduced processes behind the photofluidity superimpose over the “natural” thermally activated processes. They produce their own contribution to the delayed elastic deformation without disturbing, or being disturbed, by the thermally activated processes. This contribution can be trapped by stopping the irradiation. Additionally, this trapping opens new routes to investigate photofluidity, by separating the photoinduced from the thermally activated processes. According to the experimental results, we also specify here the modified equations of linear viscoelasticity giving the evolution of the deformation during cycles of light irradiation.

Original languageEnglish (US)
Pages (from-to)235-247
Number of pages13
JournalInternational Journal of Applied Glass Science
Issue number2
StatePublished - Apr 2019


  • chalcogenide glasses
  • delayed elasticity
  • photoinduced fluidity
  • recovery
  • viscoelasticity

ASJC Scopus subject areas

  • Materials Science(all)


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