Abstract
A series of new Er3+/Yb3+-codoped70 TeO2–5 Li2O–(25-x)B2O3–xGeO2 (TLBG,x = 0, 5, 10, 15, 20 mol%) glasses are prepared.The thermal stability and spectroscopic properties of TLBG glasses arestudied. It is found that these glasses have the better thermalstability ((Tx−Tg)>150 degrees C) comparedwith 75 TeO2–20 ZnO–5Na2O (TZN) glass. The fluorescencefull width at half maximum (FWHM) is about 77 nm, while the emissionintensity and the quantum efficiency of the 4I13/2level of Er3+ increase with the increasing GeO2 content.The maximum quantum efficiency and stimulated emission cross-section ofEr3+ calculated from the McCumber theory are 93.82% and9.0×10−21 cm2, respectively. The products of FWHMand σepeak of Er3+ in TLBG glasses are larger thanthose in other reported glasses. The obtained data indicate that thiskind of TLBG glasses is a promising candidate host material forEr3+-doped broadband amplifiers.
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