Near-IR and mid-IR luminescence and energy transfer in fluoroindate glasses co-doped with Er³⁺/Tm³⁺

Fluoroindate glasses co-doped with Pr3+/Er3+ for near-infrared luminescence applications

“…When glass sample is excited at higher-lying 4 30 . This phenomenon is related directly to the lower phonon energy (hω = 510 cm −1 ) of the fluoroindate glass-host 17 . The peak stimulated emission cross-section σ em is one of the most important radiative parameters and should be also examined because the strong luminescence band at 1535 nm due to the 4 I 13/2 → 4 I 15/2 transition has been considered as a potential near-infrared laser emission of Er 3+ ions in fluoroindate glass.…”

“…The quantum efficiency for the main 4 I 13/2 → 4 I 15/2 (Er 3+ ) laser transition at 1535 nm in fluoroindate glass is significantly higher in comparison to the values obtained earlier for borate (η = 3%) and germanate (η = 71%) glasses 30 . This phenomenon is related directly to the lower phonon energy (hω = 510 cm −1 ) of the fluoroindate glass-host 17 .…”

“…Measurement and characterization. Similar to our previous works for fluoroindate glasses 17,18 , the appropriate laser equipment was used for measurements of luminescence spectra and decay curves.…”

“…Similar to our previous works for fluoroindate glasses 17 , 18 , the appropriate laser equipment was used for measurements of luminescence spectra and decay curves. The laser system consists of PTI QuantaMaster QM40 spectrofluorimeter, optical parametric oscillator (OPO), Nd:YAG laser (Opotek Opolette 355 LD), double 200 mm monochromators and multimode UVVIS PMT (R928) and Hamamatsu H10330B-75 detectors, and PTI ASOC-10 [USB-2500] oscilloscope.…”

“…These improved spectroscopic parameters are necessary for signal amplification in telecommunication and laser technology. Some recently published works for fluoroindate glass clearly indicate that a logical extension of Er 3+ -doped systems would be the addition of other rare earth ions such as Tm 3+ or Ho 3+ ions 17 , 18 . The interesting results for fluoroindate glasses co-doped with Ho 3+ /Tm 3+ and Ho 3+ /Nd 3+ ions 19 , 20 emitting near-infrared and mid-infrared radiation at 2 μm and 3.9 μm under direct excitation (888 nm or 808 nm) have been also well presented and discussed in details.…”