A. B. Seddon, Z. Tang, D. Furniss, S. Sujecki, and T. M. Benson, Progress in rare-earth-doped mid-infrared fiber lasers, Optics Express, vol.18, issue.25, pp.26704-26719, 2010.
DOI : 10.1364/OE.18.026704

T. H. Lee, S. I. Simdyankin, L. Su, and S. R. Elliott, Evidence of formation of tightly bound rare-earth clusters in chalcogenide glasses and their evolution with glass composition, Physical Review B, vol.79, issue.18, pp.180202-180203, 2009.
DOI : 10.1103/PhysRevB.79.180202

T. H. Lee, S. I. Simdyankin, J. Hegedus, J. Heo, and S. R. Elliott, molecular dynamics simulation, Physical Review B, vol.81, issue.10, pp.104204-104205, 2010.
DOI : 10.1103/PhysRevB.81.104204

A. Feltz, Amorphous and vitreous inorganic solids, 1986.

J. Hu, C. R. Menyuk, C. Wei, B. Shaw, J. S. Sanghera et al., Highly efficient cascaded amplification using Pr^3+-doped mid-infrared chalcogenide fiber amplifiers, Optics Letters, vol.40, issue.16, pp.3687-3690, 2015.
DOI : 10.1364/OL.40.003687

R. Golovchak, Y. Shpotyuk, V. Nazabal, C. Boussard-pledel, B. Bureau et al., Study of Ga incorporation in glassy arsenic selenides by high-resolution XPS and EXAFS, The Journal of Chemical Physics, vol.142, issue.18, pp.184501-184502, 2015.
DOI : 10.1063/1.4919947

URL : https://hal.archives-ouvertes.fr/hal-01152508

R. Golovchak, Y. Shpotyuk, C. M. Thomas, V. Nazabal, C. Boussard-pledel et al., Peculiarities of Ga and Te incorporation in glassy arsenic selenides, Journal of Non-Crystalline Solids, vol.429, pp.104-111, 2015.
DOI : 10.1016/j.jnoncrysol.2015.09.001

URL : https://hal.archives-ouvertes.fr/hal-01198727

R. Krause-rehberg and H. Leipner, Positron annihilation in semiconductors: defect studies, 1999.
DOI : 10.1007/978-3-662-03893-2

Y. C. Jean, P. E. Mallon, and D. M. Schrader, Principles and Application of Positron and Positronium Chemistry, 2003.
DOI : 10.1142/5086

G. Delazir, M. Dussauze, V. Nazabal, P. Lecante, M. Dolle et al., Structural characterizations of As???Se???Te glasses, Journal of Alloys and Compounds, vol.509, issue.3, pp.831-836, 2011.
DOI : 10.1016/j.jallcom.2010.09.104

P. Jovari, B. Bureau, I. Kaban, V. Nazabal, B. Beuneu et al., The structure of As3Se5Te2 infrared optical glass, Journal of Alloys and Compounds, vol.488, issue.1, pp.39-43, 2009.
DOI : 10.1016/j.jallcom.2009.08.154

URL : https://hal.archives-ouvertes.fr/hal-00496987

J. Kansy, Microcomputer program for analysis of positron annihilation lifetime spectra, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, vol.374, issue.2, pp.235-244, 1996.
DOI : 10.1016/0168-9002(96)00075-7

F. Tuomisto and I. Makkonen, Defect identification in semiconductors with positron annihilation: Experiment and theory, Reviews of Modern Physics, vol.85, issue.4, pp.1583-1631, 2013.
DOI : 10.1103/RevModPhys.85.1583

A. Seeger, The study of defects in crystals by positron annihilation, Applied Physics, vol.34, issue.3, pp.183-199, 1974.
DOI : 10.1007/BF00884229

O. Shpotyuk and J. Filipecki, Free volume in vitreous chalcogenide semiconductors: possibilities of positron annihilation lifetime study, 2003.

O. Shpotyuk, R. Golovchak, A. Ingram, V. Boyko, and L. Shpotyuk, Comparative study of extended free-volume defects in As- and Ge-based glassy semiconductors: theoretical prediction and experimental probing with PAL technique, physica status solidi (c), vol.10, issue.1, pp.117-120, 2013.
DOI : 10.1002/pssc.201200405

M. Kastner, Compositional Trends in the Optical Properties of Amorphous Lone-Pair Semiconductors, Physical Review B, vol.7, issue.12, pp.5237-5252, 1973.
DOI : 10.1103/PhysRevB.7.5237

L. Pauling, The Nature of the Chemical Bond. V, The Journal of Chemical Physics, vol.2, issue.8, 1960.
DOI : 10.1063/1.1749514

J. Bicerano and S. R. Ovshinsky, Chemical bond approach to the structures of chalcogenide glasses with reversible switching properties, Journal of Non-Crystalline Solids, vol.74, issue.1, pp.75-84, 1985.
DOI : 10.1016/0022-3093(85)90402-8

L. Tichy and H. Ticha, Covalent bond approach to the glass-transition temperature of chalcogenide glasses, Journal of Non-Crystalline Solids, vol.189, issue.1-2, pp.141-146, 1995.
DOI : 10.1016/0022-3093(95)00202-2

O. K. Alekseeva, V. I. Mihajlov, and V. I. Shantarovich, Positron annihilation in point defects of the glassy As-Se system, Physica Status Solidi (a), vol.4, issue.2, pp.169-173, 1978.
DOI : 10.1002/pssa.2210480261