Thermal and spectroscopic properties studies of Er3+-doped and Er3+/Yb3+-codoped niobium germanate glasses for optical applications

Enhanced 1.5 μm emission from Yb3+/Er3+ codoped tungsten tellurite glasses for broadband near-infrared optical fiber amplifiers and tunable fiber lasers

“…4(b) shows that FWHM of 4 I 13/2 / 4 I 15/2 emission band increases gradually from 59 to 74 nm when Er 2 O 3 concentration varies from 0.5 to 3 mol%. These values are larger than that in other glass hosts used for optical ber ampliers, such as 38 nm in lead borosilicate glasses, 28 47 nm in lead phosphate glasses, 29 46 nm in niobium germanate glasses 30 and 48 nm in uorotellurite glasses. 5 The larger FWHM is ascribed to not only high refractive index ($2.1) which strengthens the ligand elds around Er 3+ but also to the existence of multiple structural units such as TeO 4 trigonal bipyramid, TeO 3 trigonal pyramid, TeO 3+1 polyhedra, WO 6 octahedra and WO 4 tetrahedra, which creates diverse coordination environments.…”

“…It is worth noting that the maximum gain coefficient of TWYE-1 glass is 4.07 cm −1 at 1534 nm, which is larger than those values reported in borosilicate glass (1.01 cm −1 ), 22 phosphate glasses (1.02 cm −1 ), 36 bismuthate glass (3.51 cm −1 ) 33 and niobium germanate glass (0.28 cm −1 ). 30 …”

“…7 33 and niobium germanate glass (0.28 cm À1 ). 30 Gain bandwidth is a key parameter for optical ber ampli-ers and is usually dened as the product of FWHM and cm 3 ). 37 On the other hand, the gure of merit (FOM) is another vital parameter for optical ber ampliers to achieve high gain amplication, which is usually dened as the product of emission cross section and measured lifetime.…”

Transparent glass and glass‐ceramic in the binary system NaPO3‐Ta2O5

“…The insertion of transition metal oxides can improve these properties, as reported in niobium, zinc, tungsten, and molybdenum phosphate glasses. In addition, it can result in a significant decrease in the phonon energy, minimizing the nonradiative processes when doped with rare‐earth ions (RE) . RE‐doped glasses are attractive for optical applications such as lasers and telecommunications devices …”

“…In addition, it can result in a significant decrease in the phonon energy, 10 minimizing the nonradiative processes when doped with rare-earth ions (RE). 11,12 RE-doped glasses are attractive for optical applications such as lasers 13 and telecommunications devices. 14,15 Recently, structural changes in phosphate glasses has been reported by the addition of WO 3 , 16,17 Ta 2 O 5 , 18,19 V 2 O 5 , 20 TiO 2 , [21][22][23] and Nb 2 O 5 1,5,24 .…”