1. Measurement of non-equilibrium carriers dynamics in Ce-doped YAG, LuAG and GAGG crystals with and without Mg-codoping
- Author
-
S. Tikhomirov, Augustas Vaitkevicius, Akira Yoshikawa, Gintautas Tamulaitis, Martin Nikl, Saulius Nargelas, Kei Kamada, Etiennette Auffray, M. Korjik, P. Bohacek, D. Kozlov, O. Buganov, and Marco Toliman Lucchini
- Subjects
Free electron model ,Materials science ,Absorption spectroscopy ,Population ,excitation transfer ,Biophysics ,Analytical chemistry ,non-linear absorption spectroscopy ,scintillators ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Biochemistry ,Ion ,Optics ,Detectors and Experimental Techniques ,Free carrier absorption ,Absorption (electromagnetic radiation) ,education ,education.field_of_study ,multi-component garnet crystals ,business.industry ,Doping ,General Chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,0104 chemical sciences ,Absorption band ,Infrastructure for advanced calorimeters [14] ,0210 nano-technology ,business - Abstract
Non-linear absorption spectroscopy in pump and probe configuration has been used to test the population of non-equilibrium carriers in Ce-doped Y$_{3}$Al$_{5}$O_${12}$ (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 1.4 ps 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 150 ps has been observed in all the Ce-doped garnets under study and can be attributed to the absorption from the Ce3+ excited states.
- Published
- 2018