Improvement of 1.53μm emission and energy transfer of Yb3+/Er3+ co-doped tellurite glass and fiber

Origin of near to middle infrared luminescence and energy transfer process of Er3+/Yb3+co-doped fluorotellurite glasses under different excitations

“…The larger bandwidth of this transition is suitable for tunable lasers that deliver relatively constant power over a wide wavelength range. The FWHM value in the EY1.5 glass in this study is about 55 nm, which is not only higher than those of silicate (34.8 nm)33 and phosphate (46.0 nm)33 but also higher than those of pure fluoride ZELAG (46 nm)34 and tellurite glasses (53 nm)35. The emission cross section is an important parameter for 2.7 μm emission which can be calculated as103637where λ is the wavelength.…”

Structural and spectroscopic behavior of Er3+/Yb3+ co-doped boro-tellurite glasses

“…1. It is observed from the figure that, the X-ray diffraction pattern of the prepared glasses exhibits a broad diffused scattering which represents a typical long range structural disorder and the absence of sharp peaks confirms the amorphous nature [6].…”

“…A commercial EDFA operating in the 1.53 μm band can make use of either 980 nm or 1480 nm pumping scheme. Compared with the 1480 nm pumping scheme the 980 nm laser diode (LD) is often used as a pumping source to realize a 1.5 μm band amplification with broad gain and good signal-to-noise ratio [6]. However, the absorption cross-section for the 4 I 15/2 → 4 I 11/2 transition corresponding to the 980 nm is lower than the 4 I 15/2 → 4 I 13/2 transition corresponding to the 1480 nm in the Er 3+ doped glasses.…”

Evaluation of optical parameters of some tellurite glasses

“…Er 2 O 3 , Nb 2 O 5 and Nd 2 O 3 increased the molar polarizability of the present tellurite glass. The optical basicity has been calculated of the present quaternary tellurite glass system of the form 80TeO 2 3 and Er 2 O 3 by using the next equation according to Duffy [15].…”

“…Tellurite glasses exhibit a wide transmission range, high linear and nonlinear refractive index, good chemical durability, high density, and good glass stability and low glass transition temperature. A great research interests on tellurite glasses are focused on their interesting properties, engineering of lasers amplifiers based on fibers for optical communication and upconversion luminescence [2][3][4][5][6][7][8][9][10][11][12][13][14]. Quaternary tellurite glasses of the form 80TeO 2 -5TiO 2 -(15-x) WO 3 -xA n O m where xA n O m = 0.01, 1, 3, 5 Nb 2 O 5 (glass a) or 0.01, 0.1, 1, 3 Nd 2 O 3 (glass b) and 0.01, 0.1, 1, 3, 5, 7 Er 2 O 3 mol% (glass c) have been prepared by the melt quenching technique.…”