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

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

Research output: Contribution to journalArticle

40 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
Externally publishedYes

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thin films
illumination
glass
wavelengths
lasers

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Khan, P., Barik, A. R., Madhavan, V., 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

Coexistence of fast photodarkening and slow photobleaching in Ge 19As21Se60 thin films. / Khan, Pritam; Barik, A. R.; Madhavan, Vinod; Sangunni, K. S.; Jain, H.; Adarsh, K. V.

In: Optics Express, Vol. 20, No. 11, 21.05.2012, p. 12416-12421.

Research output: Contribution to journalArticle

Khan, P, Barik, AR, Madhavan, V, Sangunni, KS, Jain, H & Adarsh, KV 2012, 'Coexistence of fast photodarkening and slow photobleaching in Ge 19As21Se60 thin films', Optics Express, vol. 20, no. 11, pp. 12416-12421. https://doi.org/10.1364/OE.20.012416
Khan, Pritam ; Barik, A. R. ; Madhavan, Vinod ; Sangunni, K. S. ; Jain, H. ; Adarsh, K. V. / Coexistence of fast photodarkening and slow photobleaching in Ge 19As21Se60 thin films. In: Optics Express. 2012 ; Vol. 20, No. 11. pp. 12416-12421.
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