Highly efficient Er3+: Pr3+-codoped CW fluorozirconate fiber laser operating at 2.7 µm

High-Power ZBLAN Glass Fiber Lasers: Review and Prospect

“…Soon several low-efficiency diodepumped fiber lasers were reported [65][66][67]. Compared to the low efficiency (<10%) and low power operations (<10 mW) of these singly Er 3+ -doped ZBLAN fiber lasers, higher output power of 30 mW with an efficiency more than 13% was obtained in an Er 3+ /Pr 3+ -codoped ZBLAN fiber laser [68].…”

The route toward a diode-pumped 1-W erbium 3-/spl mu/m fiber laser

“…This reduces GSA and, hence, ground-state bleaching. 4) Pr co-doping can remove energy from the lower laser level and repopulate the ground state [12], [8]. (A fifth possibility, the quenching of the lifetime of the lower laser level by interionic upconversion, is probably not of relevance; cf.…”

“…The requirement of high pump intensity, however, excludes the cascade regime from diode pumping. Third, the unexpectedly low performance of a different approach, the quenching of the lower laser level by Pr co-doping [8], could be explained by insufficient quenching and the successful competition of ESA with subsequent 850-nm lasing [9]. So far, it has been possible only with ESA to overcome the bottleneck of ground-state bleaching and long excited-state lifetimes.…”

Energy transfer processes inEr3+-doped andEr3+Golding1, Jackson2, King3 et al. 2000Phys. Rev. B2023772View full textAdd to dashboardCite

“…For instance, these processes can be a source of loss if originating in the upper laser level. 6,7 However, these processes can be beneficial, e.g., for sensitizing the lasing ion by energy transfer ͑ET͒ from a codopant, 8,9 for quenching the lower laser level by ET to a codopant, 10,11 or for ETU of the pump excitation to a highlying upper laser level. 12,13 A quantitative understanding of the relevant energy transfer processes is, therefore, required for optimizing the corresponding laser system.…”