Thermo-optical parameters of tellurite glasses doped with Yb³⁺

Abstract

This work presents a study of the thermal lens technique to quantify the thermo-optical coefficients ds/dT (optical path change with temperature), thermal diffusivity and conductivity of tellurite glasses doped with Yb3+. The glasses present binary, ternary and quaternary compositions. Yb3+ ions allow the determination of the quantum efficiency, radiative and experimental lifetime of the 2F5/2 → 2F7/2 Yb3+ transition, as well as the fraction of energy converted into heat. It is pointed out that ds/dT is strongly dependent on the glass composition. It is shown that the quaternary composition presents the highest K, D and low ds/dT suggesting that it could be used to develop high temperature photonic devices.

Fluorescence quantum yield of Yb3+-doped tellurite glasses determined by thermal lens spectroscopy

“…As noted, the values are higher than 90% for the lowest Yb concentration, independent of the host glass, and a concentration quenching can be observed considering the Yb range. The value found for concentrations <2 Â 10 20 ions/cm 3 in TL glass is relatively higher than the values found by Kassab et al using the same TLS in other Yb 3þ -doped tellurite glasses [25]. This slightly difference, probably, is due to our glass system has lower phonon energy than the binary, ternary and quaternary systems reported by the authors.…”

Laser emission of a Nd-doped mixed tellurite and zinc oxide glass

“…Their high nonlinear optical properties can be used advantageously for the development of Kerr-lens mode-locked subpicosecond lasers. Spectroscopic [20,21] and thermo-optical properties [22,23] of these tellurite glasses have been also studied in recent years for the possibility of using thin films for the fabrication of rib waveguides [24] and for the possibility of increasing the luminescent quantum yield of rare-earth ions, in general, by codoping the materials with silver nanoparticles [20,21].…”

A tellurite glass optical microbubble resonator

“…The thermal expansion coefficient for tellurite glass is 1.9 × 10 −5 K −1 [21], which is 38 times larger than the corresponding value for silica glass of 0.51 × 10 −6 K −1 [22]. The thermo-optic coefficient ∆n/∆T is 1.08 × 10 −5 K −1 [31], and the frequency shift as a function of temperature ∆f /∆T was calculated to be 4.9 GHz/K, which is about 4 times lager than for a silica microsphere of 1.28 GHz/K at room temperature [32]. According to Equation ( 2), the frequency shift can also be affected by air pressure, which changes the diameter of the microbubble and the refractive index by stress, see Figure 3(c).…”