Abstract
Non-linear absorption spectroscopy in pump and probe configuration has been used to test the population of non-equilibrium carriers in Ce-doped Y3Al5O12 (YAG), Lu3Al5O12 (LuAG), and Gd3AlxGa(5-x)O12 (GAGG) crystals with and without codoping by Mg2+ ions. A faster rise time of the induced optical density has been observed in all crystals codoped with Mg with respect to that in Mg-free samples. A significant difference in the time evolution of the differential optical density in GAGG with respect to YAG and LuAG crystals has also been measured. In both GAGG:Ce and GAGG:Ce,Mg an absorption band with maximum in the blue-green range and a decay time of 1.4ps is present. This band is due to the absorption by free electrons before they are trapped or re-captured by Ce3+ ions. A broad absorption band in the yellow-red region with very short rise time and a decay time longer than 150ps has been observed in all the Ce-doped garnets under study and can be attributed to the absorption from the Ce3+ excited states.
Highlights
Non-linear absorption spectroscopy in pump and probe configuration has been used to test the population of nonequilibrium carriers in Ce-doped Y3Al5O12 (YAG), Lu3Al5O12 (LuAG), and Gd3AlxGa(5−x)O12 (GAGG) crystals with and without codoping by Mg2+ ions
The codoping of Ce-doped scintillation materials with role in defining the time resolution achievable with a given alkali earth ions has been recently demonstrated to be a scintillator, which depends on the interplay between the promising approach to improve the scintillation properlight yield and the kinetics of the scintillation process [1]. 25 ties, especially in the scintillators with a garnet-type crys
A shorter and brighter scintillation pulse leads to a smaller tal matrix [6, 7]. Such improvement is a combined result jitter on the arrival time of the first photons at the photo- of the modification of electronic excitation transfer prodetector. These parameters are crucial in defin- cesses, achieved by band gap engineering, and the tailoring the potential application of inorganic scintillators for ing of the activator level energy within the gap, impleboth time of flight positron emission tomography
Summary
Non-linear absorption spectroscopy in pump and probe configuration has been used to test the population of nonequilibrium carriers in Ce-doped Y3Al5O12 (YAG), Lu3Al5O12 (LuAG), and Gd3AlxGa(5−x)O12 (GAGG) crystals with and without codoping by Mg2+ ions. The B1 band is considerably less resolved in the absorption spectra of YAG:Ce and LuAG:Ce samples and no fast decay component in the kinetics is observed for the difabsorption spectrum of the GAGG:Ce sample shows ferential optical density probed at a spectral wavelength a set of narrow absorption bands in the UV range corresponding to the transitions from 8S ground state to the close to the B1 band (around 400 nm).
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