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Understanding temperature’s impact on spectroscopic properties in high-power thulium-doped fiber lasers is crucial for accurate numerical modeling. Our study discusses influence of thulium concentration and temperature-induced bend losses on emission spectra measurement.

In this study, we investigate the effects of Ho 3+ codoping on the luminescence and scintillation properties of GGAG:Ce, with a particular focus on timing properties and scintillator efficiency. The research reveals that Ho 3+ codoping and subsequent resonant energy transfer from Ce 3+ to Ho 3+ can significantly reduce the 5d 1 excited state decay time of Ce 3+ and shorten scintillation pulses of GGAG:Ce registered by using photomultipliers, although this reduces scintillator efficiency as well. The study presents a detailed analysis of the loss of scintillator efficiency due to Ho 3+ codoping, identifying the most significant loss pathways and estimating their impact. The findings suggest that Ho 3+ codoping is an effective method for accelerating the scintillation response of GGAG:Ce. Furthermore, the study presents a high level of consistency of the Ce 3+ kinetics with the Inokuti-Hirayama model and with results obtained in the previous studies on similar systems, demonstrating the predictability of the effect of RE 3+ codoping on scintillator properties., Competing Interests: There are no conflicts to declare., (This journal is © The Royal Society of Chemistry.)

In this Letter, for the first time, to the best of our knowledge, a pulse and CW laser based on an Er-doped Gd 3 Ga 2.7 Al 2.3 O 12 (Er:GGAG) active medium emitting laser radiation at 2.8 μm are presented. With the longitudinal diode pumping, the maximal output energy of 4.9 mJ and slope efficiency of 13.5% in the pulse regime were reached. Using the birefringent MgF 2 plate, the line tunability of Er:GGAG at several spectral bands of 2800-2822 nm, 2829-2891 nm, and 2917-2942 nm were obtained.