title: Enhanced emission of 2.7 μm pumped by laser diode from Er3+/Pr(3+)-codoped germanate glasses.
abstract: A novel Er(3+)/Pr(3+) codoped germanate glass was fabricated and analyzed. Efficient emission at 2.7 μm from the glass was observed upon excitation of a conventional 980 nm laser diode. The 2.7 μm emission characteristics and energy transfer (ET) were investigated. Population inversions between ⁴I(13/2) and ⁴I(11/2) levels have been achieved, and an enhanced emission from 2550 to 2800 nm was obtained. Large ET efficiency of 95% indicates that the ET process from Er(3+) to Pr(3+) (⁴I(13/2), ³H₄)→(⁴I(15/2), ³F₃) is efficient and that Pr(3+) can enhance the emission of 2.7 μm by quenching the lower laser level of Er(3+) via ET.
authors.affiliation: Key Laboratory of Materials for High Power Lasers, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
authors.forename: Rongrong
authors.initials: R
authors.lastname: Xu
authors.forename: Ying
authors.initials: Y
authors.lastname: Tian
authors.forename: Lili
authors.initials: L
authors.lastname: Hu
authors.forename: Junjie
authors.initials: J
authors.lastname: Zhang
mesh_terms: D004871:Erbium / Q000737:chemistry*; D005857:Germanium / Q000737:chemistry*; D005898:Glass / Q000737:chemistry*; D054023:Lasers, Semiconductor; D053844:Lasers, Solid-State; D011221:Praseodymium / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D005857:Germanium; D004871:Erbium; D011221:Praseodymium