Erbium-doped tellurite glasses with high quantum efficiency and broadband stimulated emission cross section at 1.5 μm

Expanding broadband emission in the near-IR via energy transfer between Er3+–Tm3+ co-doped tellurite-glasses

“…However, the bandwidth and intensity of this emission strongly depends on the host matrix. On the other hand, Tm 3 þ ions exhibit three different emissions in the near-infrared, the 3 H 5 -3 H 6 radiative transition of four levels when pumped at 790 nm, the S-band from 3 H 4 -3 F 4 radiative indirect transition [18][19][20][21] and the 3 F 4 -3 H 6 radiative transition in the region 1700-2010 nm [22,23]. Nonetheless, the inversion of population for those electronic transitions is usually difficult to achieve since the short lifetime of the low energy levels can create the so-called "bottelneck" effect.…”

Luminescence of Tb3+ doped TeO2–ZnO–Na2O–PbO glasses containing silver nanoparticles

“…In general, tellurite based metal-dielectric composites present a large transmittance window ͑360-4500 nm͒, low cutoff phonon energy ͑ϳ700 cm −1 ͒, high refractive index ͑ϳ2.0͒, and high nonlinear optical response. [1][2][3][4][5][6][7][8][9][10][11] Tellurite glasses and composites doped with Tb 3+ ions deserve particular attention because they have large potential for the development of amplifiers and lasers covering the main telecom windows. In the visible region the emission spectrum of Tb 3+ ion shows intense fluorescence in the bluered region and this allows often the use of Tb 3+ doped materials as phosphors in fluorescent lamps, x-ray intensify screens, and TV tubes.…”

Waveguiding and photoluminescence in Er3+-doped Ta2O5 planar waveguides

“…The bandwidth of the spectrum (FWHM) was measured to be 50 nm which is substantially broader than those obtained from non-tellurite glasses (~30 nm) [20] and comparable to high index contrast hosts such as tellurite glasses (n~2.1, 65 nm) [21] and alumina (n~1.69, 55 nm) [22] and thus shows potential for broadband applications. The photoluminescence intensity increases with annealing temperature to about 14 times that of the unannealed sample at 600 ƕ C. Figure 7 shows the bandwidth of the normalised photoluminescence spectra to be constant for the annealed and unannealed Er:Ta 2 O 5 samples.…”

“…The luminescence lifetime of the erbium ions is shown in figure 8. It can be seen from the fit (bold dashed lines) in figure 8 that the decay is almost purely single exponential, and the quality of fit improves with the increasing annealing temperature consequently, the luminescence decay time was found to increase from 0.53 ms for the as-deposited sample to 2.4 ms for the sample annealed at 600 ƕ C. The value of lifetime is smaller than those obtained from non-tellurite glasses (10-15 ms) [20] and alumina (6 ms) [22] but comparable to high index contrast hosts such as tellurite glasses (3.5 ms)…”