Coexistence of fast photodarkening and slow photobleaching in Ge 19As21Se60 thin films

Pritam Khan, A. R. Barik, E. M. Vinod, K. S. Sangunni, H. Jain, K. V. Adarsh

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44 Citations (Scopus)

Abstract

We experimentally demonstrate the coexistence of two opposite photo-effects, viz. fast photodarkening (PD) and slow photobleaching (PB) in Ge19As21Se60 thin films, when illuminated with a laser of wavelength 671 nm. PD appears to begin instantaneously upon light illumination and saturates in tens of seconds. By comparison, PB is a slower process that starts only after PD has saturated. Both PD and PB follow stretched exponetial dependence on time. Modeling of overall change as a linear sum of two contributions suggests that the changes in As and Ge parts of glass network respond to light effectively indepndent of each other.

Original languageEnglish
Pages (from-to)12416-12421
Number of pages6
JournalOptics Express
Volume20
Issue number11
DOIs
Publication statusPublished - 21 May 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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    Khan, P., Barik, A. R., Vinod, E. M., Sangunni, K. S., Jain, H., & Adarsh, K. V. (2012). Coexistence of fast photodarkening and slow photobleaching in Ge 19As21Se60 thin films. Optics Express, 20(11), 12416-12421. https://doi.org/10.1364/OE.20.012416