2 μm fluorescence of Ho3+:5I7 → 5I8 transition sensitized by Er3+ in tellurite germanate glasses

Abstract This paper investigated the mid-infrared luminescence properties of Er 3+ /Ho 3+ co-doped tellurite germanate glass at 2 μm pumped by 980 nm. Thermal stability of the system, absorption spectra and fluorescence spectra of the Er 3+ /Ho 3+ co-doped glass sample were measured. Besides, the absorption spectra of the Ho 3+ singly doped sample was measured. According to the measured absorption spectra and the Judd–Ofelt theory, the Judd–Ofelt intensity parameters Ω t ( t  = 2, 4, 6), spontaneous radiative transition probability, branching ratio and lifetime of Ho 3+ were calculated. And the upconversion emission in Er 3+ doped and Er 3+ /Ho 3+ co-doped tellurite germanate glasses pumped by 980 nm have been investigated. Then the spectroscopic properties and possible energy transfer mechanisms between Ho 3+ and Er 3+ ions were discussed in detail. Meanwhile, the FWHM (146 nm), σ e peak  × FWHM (659.92 cm 3 ) and emission cross section (4.52 × 10 −21  cm 2 ) of 5 I 8  →  5 I 7 transition of Ho 3+ were obtained, respectively. The results indicate that Er 3+ /Ho 3+ co-doped tellurite germanate glass is a promising host material for 2 μm solid laser.

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