High quantum efficiency YbAG-crystals

Near infrared quantum cutting in heavy Yb doped Ce0.03Yb3xY(2.97−3x)Al5O12 transparent ceramics for crystalline silicon solar cells

“…The measured Yb 3+ lifetime for S1 and S1 was longer than that for the counterparts in Ref. 17 20 Upon a 466 nm excitation, the Ce 3+ :5d 1 → CTS transition needs the assistance of phonons and its possibility should be quite small for the large energy gap between Ce 3+ :5d 1 and CTS ͑ϳ20 000 cm −1 ͒. What is more, if the CTS seriously quenched the Ce emission upon the 466 nm excitation, the lifetime of Yb 3+ ͑under 466 nm excitation͒ would also be reduced since Yb 2+ was a quenching center for Yb 3+ .…”

Charge transfer processes and ultraviolet induced absorption in Yb:YAG single crystal laser materials

“…One of the most commonly used crucible materials is iridium, however, crystals grown by using this crucible material typically show relatively high levels of Fe-and Ni-impurities. 15 On the other hand, it has been observed that YAG crystals grown from rhenium crucibles contain much lower levels of Feand Ni impurities. 15 As the majority of YAG crystals will generally contain small (tens of ppm) but not insignificant amounts of impurities (e.g., Fe), our investigation will also cover the influence of iron impurities on different CT processes in Yb:YAG crystals.…”

“…15 On the other hand, it has been observed that YAG crystals grown from rhenium crucibles contain much lower levels of Feand Ni impurities. 15 As the majority of YAG crystals will generally contain small (tens of ppm) but not insignificant amounts of impurities (e.g., Fe), our investigation will also cover the influence of iron impurities on different CT processes in Yb:YAG crystals. A comparison will be made between different UV-irradiated Yb:YAG crystals grown from both iridium and rhenium crucibles.…”

“…It has been suggested that the presence of Yb 2þ can play a major role within the nonlinear decay processes in Yb:YAG crystals 15 as well as for the PD process in Yb-doped fiber lasers. 24 In particular, energy transfer between Yb 3þ and Yb 2þ ions has been suggested as a possible route for the observed loss mechanisms.…”

Spectroscopic excitation and quenching processes in rare-earth-ion-doped AI203 and their impact on amplifier and laser performance

“…[109][110][111][112]. Under quasi-CW excitation, the ratio I 1q (0) / I 1a (0) of the luminescence intensities of quenched and active ions, respectively, at t = 0 is calculated as Owing to their short lifetime, the relative excitation density and resulting luminescence intensity from quenched ions (second and third column of Fast quenching processes are probably present in many optical materials, in crystals [117] as well as in glass hosts like ours. Applying an upconversion model that treats all ions equally to the incomplete picture provided by luminescence decay experiments under quasi-CW excitation necessarily leads to incorrect results.…”