title: Intense near-infrared emission of 1.23 μm in erbium-doped low-phonon-energy fluorotellurite glass.
abstract: Intense near-infrared emission located at 1.23 μm wavelength originating from the erbium (Er(3+)):(4)S3/2→(4)I11/2 transition is observed in Er(3+)-doped fluorotellurite glasses. This emission is mainly contributed by the relatively low phonon energy of the fluorotellurite glass host (~776 cm(-1)). Judd-Ofelt analysis indicates a strong asymmetry and covalent environment between Er(3+) ions and ligands in the host matrix. The emission cross-section was calculated to be 2.85×10(-21) cm(2) by the Füchtbauer-Ladenburg equation, and the population inversion is realized according to a simplified evaluation. The results suggest that the fluorotellurite glass system could be a promising candidate for the development of optical amplifiers and lasers operating at the relatively unexplored 1.2 μm wavelength region.
authors.affiliation: Department of Electrical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong. eebzhou@gmail.com
authors.forename: Bo
authors.initials: B
authors.lastname: Zhou
authors.forename: Lili
authors.initials: L
authors.lastname: Tao
authors.forename: Clarence Yat-Yin
authors.initials: CY
authors.lastname: Chan
authors.forename: Yuen Hong
authors.initials: YH
authors.lastname: Tsang
authors.forename: Wei
authors.initials: W
authors.lastname: Jin
authors.forename: Edwin Yue-Bun
authors.initials: EY
authors.lastname: Pun
mesh_terms: D000042:Absorption; D004871:Erbium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D008958:Models, Molecular; D055620:Optical Phenomena; D060739:Phonons; D019265:Spectroscopy, Near-Infrared; D013691:Tellurium / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D004871:Erbium; D013691:Tellurium