Thermal stability and spectroscopic properties of erbium-doped niobic-tungsten–tellurite glasses for laser and amplifier devices

Lasing effects in new Nd3+-doped TeO2–Nb2O5–WO3 bulk glasses

“…It was indeed shown that Nd 3+ -doped samples present systematically a higher T x value compared to that of the undoped sample. All these thermal parameters are finally very comparable to the values reported in [28][29][30].…”

“…Several reasons led us to select this system. In particular, the thermal stability DT (defined by DT = T x À T g , and where T x and T g correspond respectively to the onset crystallization and the glass transition temperatures) of such family of glasses is very attractive, as it is quite large (DT values found ranging from $140 to $180°C, depending on the chemical composition) [28][29][30]. The glasses are then very stable against devitrification and constitute promising candidates in case of future drawing of fibers.…”

“…Moreover, this TNW chemical system has been selected as it presents the advantage of having a T g value which is rather high among tellurite glasses [28][29][30]. Indeed, it is important to stress here that prior to this current work, we carried out preliminary tests on bulk laser cavities (see the experimental section for a complete description of the cavity) constituted of other tellurite glasses (different from the TNW chemical composition and not covered with any anti-reflective coatings).…”

“…Finally, the spectroscopic properties (emission spectra, lifetime, quantum efficiency, absorption and stimulated emission cross-sections) were measured for a variety of TNW glasses doped with different rare earth ions: Yb 3+ [36], Er 3+ [28,30] and Er 3+ /Yb 3+ co-doping [29]. These references testify to the potentialities of doped TNW glasses for being employed either as a host material for broadband optical amplifier or as a $1/$1.5 lm laser source.…”

Optimizing Nd/Er ratio for enhancement of broadband near-infrared emission and energy transfer in the Er3+–Nd3+ co-doped transparent silicate glass-ceramics

“…Therefore, the transparent glass-ceramics can be prepared by heat-treatment in the first crystallization peak near 691°C. According to the DTA result analysis, in this study, all the prepared glasses were heat-treated at 691°C for 6 h. At the same time, the difference ΔT between the T x and T g (ΔT = T x − T g ) is used as a rough indicator of glass thermal stability [22], and ΔT = 153°C N 100°C indicating that the prepared glass is stable and suitable for applications such as fiber amplifiers, solar cells and lasers [23,24]. Chosen SABTC-0.5N0.4E glasses were selected to carry out heat treatment at 691°C for different times 6, 12, 18 and 24 h to form transparent glass-ceramics and the fabricated samples were named as SABTC-6 h, SABTC-12 h, SABTC-18 h and SABTC-24 h, respectively.…”