Photoinduced fluidity in chalcogenide glasses at low and high intensities: A model accounting for photon efficiency

Yann Gueguen, Jean Christophe Sangleboeuf, Vincent Keryvin, Eric Lépine, Zhiong Yang, Tanguy Rouxel, Céline Point, Bruno Bureau, Xiang Hua Zhang, Pierre Lucas

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Detailed measurements of photoinduced fluidity in Ge-Se glasses were performed using a novel shear relaxation test in torsion mode. It is shown that photofluidity is significant even at a very low intensity and that there is no apparent threshold for activating the photostructural processes. Instead, the mechanism of photofluidity is described as a cumulative process involving photoinduced motions of every atom within the irradiated volume. Based on this assumption, a model is proposed, which is shown to accurately predict the power and wavelength dependence of photofluidity using a single fitting parameter n. The factor n represents the photon efficiency for inducing an atomic motion. Photofluidity experiments performed on glass fibers of various mean coordination number indicate that the process is rapidly reduced in overconstrained glasses. The values of n obtained for these glasses correlate remarkably well with the mean coordination dependence of other photostructural changes (photodarkening, photoexpansion). This indicates that the model is physically sound. Moreover, the model is shown to quantitatively describe photofluidity data from other glass systems from literature, therefore suggesting that it could be universally applied to all chalcogenide glasses.

Original languageEnglish (US)
Article number134114
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number13
DOIs
StatePublished - Oct 18 2010

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Fluidity
Photons
Glass
glass
photons
Photochromism
glass fibers
coordination number
Torsional stress
Glass fibers
torsion
Acoustic waves
shear
Wavelength
Atoms
thresholds
acoustics
wavelengths
atoms
Experiments

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Photoinduced fluidity in chalcogenide glasses at low and high intensities : A model accounting for photon efficiency. / Gueguen, Yann; Sangleboeuf, Jean Christophe; Keryvin, Vincent; Lépine, Eric; Yang, Zhiong; Rouxel, Tanguy; Point, Céline; Bureau, Bruno; Zhang, Xiang Hua; Lucas, Pierre.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 82, No. 13, 134114, 18.10.2010.

Research output: Contribution to journalArticle

Gueguen, Yann ; Sangleboeuf, Jean Christophe ; Keryvin, Vincent ; Lépine, Eric ; Yang, Zhiong ; Rouxel, Tanguy ; Point, Céline ; Bureau, Bruno ; Zhang, Xiang Hua ; Lucas, Pierre. / Photoinduced fluidity in chalcogenide glasses at low and high intensities : A model accounting for photon efficiency. In: Physical Review B - Condensed Matter and Materials Physics. 2010 ; Vol. 82, No. 13.
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