A brief description of the basic spectroscopic properties of Tm<sup>3+</sup>-doped 20Ge-5Ga-10Sb-65S (GeGaSbS) glass is presented. Spontaneous-emission probabilities, radiative lifetimes, branching ratios, and quantum efficiency of Tm<sup>3+</sup> in GeGaSbS glass are evaluated by use of Judd-Ofelt theory. Lifetime measurements are carried out at room and low temperatures. A large difference of the lifetime values occurs between the theoretical and experimental results. McCumber and Ladenburg-Funchtbauer techniques are used for the emission cross-section determinations. Discrepancies appear between these two techniques. Hypotheses about the presence of the diffusion-limited relaxation process are applied for explanations.
© 2006 Optical Society of America
Original Manuscript: January 17, 2006
Revised Manuscript: June 14, 2006
Manuscript Accepted: July 27, 2006
V. G. Truong, A. M. Jurdyc, B. Jacquier, B. S. Ham, A. Q. Le Quang, J. Leperson, V. Nazabal, and J. L. Adam, "Optical properties of thulium-doped chalcogenide glasses and the uncertainty of the calculated radiative lifetimes using the Judd-Ofelt approach," J. Opt. Soc. Am. B 23, 2588-2596 (2006)