Abstract
This paper investigated the mid-infrared luminescence properties of Er3+/Ho3+ co-doped tellurite germanate glass at 2μm pumped by 980nm. Thermal stability of the system, absorption spectra and fluorescence spectra of the Er3+/Ho3+ co-doped glass sample were measured. Besides, the absorption spectra of the Ho3+ singly doped sample was measured. According to the measured absorption spectra and the Judd–Ofelt theory, the Judd–Ofelt intensity parameters Ωt (t=2,4,6), spontaneous radiative transition probability, branching ratio and lifetime of Ho3+ were calculated. And the upconversion emission in Er3+ doped and Er3+/Ho3+ co-doped tellurite germanate glasses pumped by 980nm have been investigated. Then the spectroscopic properties and possible energy transfer mechanisms between Ho3+ and Er3+ ions were discussed in detail. Meanwhile, the FWHM (146nm), σepeak×FWHM (659.92cm3) and emission cross section (4.52×10−21cm2) of 5I8→5I7 transition of Ho3+ were obtained, respectively. The results indicate that Er3+/Ho3+ co-doped tellurite germanate glass is a promising host material for 2μm solid laser.
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