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In this work, the glass network has been tailored by introducing the modifier WO 3 when a Ho 3+ /Yb 3+ co-doped bismuth-tellurite glass composition was designed. The physical, absorption, emission, structure, and gain characteristics of the glasses with the different contents of WO 3 were investigated comprehensively based on various tests and analytical methods such as absorption spectra , fluorescence spectra , Raman spectra , and J-O theory. The results show that both the optical band gap and the bridge oxygen content are enhanced remarkably while the substitution of TeO 2 by WO 3 , accelerating the transition from TeO 3 to TeO 4 units. Simultaneously, the value of Ω 6 reached the maximum of 2.26×10 -20 cm 2 when the WO 3 is equal to 10 mol%, indicating that the Stark splitting of Ho 3+ : 5 I 7 energy level is the weakest. The optimal FWHM and the gain coefficient are 143.3 nm and 2.22 cm -1 , respectively. Furthermore, a blue shift of the central wavelength in absorption and emission peaks can be observed at the 2 μm band. As mentioned above, the bismuth-tellurite glass prepared is an ideal gain material that can realize a wider spectra span.
Ren et al. (Sun,) studied this question.