Abstract
Transparent Er3+-doped germanotellurite glass ceramics (GCs) with variable Te/Ge ratio were prepared by controllable heat-treated process. X-ray diffraction (XRD) and transmission electron microscope (TEM) confirmed the formation of nanocrystals in glass matrix. Raman spectra were used to investigate the evolution of glass structure and photon energy. Fourier transform infrared (FTIR) spectra were introduced to characterize the change of hydroxyl group (OH−) content. Enhanced 2.7 μm emission was achieved from Er3+-doped GCs upon excitation with a 980 nm laser diode (LD), and the influence of GeO2 concentration and heat-treated temperature on the spectroscopic properties were also discussed in detail. It is found that the present Er3+-doped GC possesses large stimulated emission cross section at around 2.7 μm (0.85 × 10−20 cm2). The advantageous spectroscopic characteristics suggest that the obtained GC may be a promising material for mid-infrared fiber lasers.
Highlights
GeO2 concentration and heat-treated temperature on the spectroscopic properties were discussed in detail
A few studies have been conducted on tellurite GCs, to our best knowledge, no work is reported about the 2.7 μm emission of Er3+-doped germanotellurite glasses and GCs system
We can observe that the glass transition temperature (Tg), onset crystallization temperature (Tx), and crystallization peak temperature (Tp) increase significantly with the increase of GeO2 concentration
Summary
GeO2 concentration and heat-treated temperature on the spectroscopic properties were discussed in detail. Mid-infrared (MIR) lasers operating at around 3 μmhave triggered increasing interest in coherent MIR light sources. This is mainly due to the strong absorption band by water at this wavelength and ~3 μm MIR lasers cover a great number of important molecular characteristic spectral lines, which make MIR fiber lasers appropriate in the fields of medical surgery, remote sensing, environmental monitoring and so forth[1,2,3,4,5]. We obtained enhanced 2.7 μm emission from Er3+-doped germanotellurite glasses and GCs, and the influence of GeO2 concentration and heat-treated temperature on the spectroscopic properties of Er3+-doped germanotellurite glasses and GCs are discussed in detail
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