Excited state relaxation dynamics and up-conversion phenomena in Gd3(Al,Ga)5O12 single crystals co-doped with holmium and ytterbium
PBN-AR
Instytucja
Instytut Fizyki Polskiej Akademii Nauk
Informacje podstawowe
Główny język publikacji
en
Czasopismo
JOURNAL OF ALLOYS AND COMPOUNDS
ISSN
0925-8388
EISSN
Wydawca
ELSEVIER SCIENCE SA
DOI
URL
Rok publikacji
2016
Numer zeszytu
Strony od-do
573-580
Numer tomu
656
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
Garnet crystals Holmium-doped crystals Up-conversion phenomena
Streszczenia
Język
en
Treść
Single crystals of Gd-3(ALGa)(5)O-12 single doped with Ho3+ or Yb3+ ions and co-doped with Ho3+ and Yb3+ ions were grown by the Czochralski technique and investigated employing methods of optical spectroscopy. Rates of radiative transitions, branching ratio values and radiative lifetimes for excited multiplets of incorporated Ho3+ ions were determined based on the Judd-Ofelt treatment of optical absorption spectra recorded at room temperature. Absorption spectra and luminescence spectra recorded at 5 K made it possible to determine crystal field splitting for several low energy multiplets of Ho3+ ions and for the F-2(5/2) multiplet of Yb3+ ions. Lifetimes of luminescent levels of incorporated holmium and ytterbium ions and the Yb3+ Ho3+ energy transfer efficiency were determined based on analysis of recorded luminescence decay curves. Up-conversion of infrared radiation at 980 nm into yellow emission in crystals co-doped with holmium and ytterbium was observed and discussed. It was found that the structural disorder of the Gd-3(ALGa)(5)O-12 host resulting from a disparity of ionic radii of Al and Ga ions induces an inhomogeneous broadening of spectral lines of incorporated luminescent ions but the crystal field splitting of their multiplets is similar to that encountered in ordered garnet hosts. Based on analysis of gathered spectroscopic data it was concluded that the Gd-3(Al,Ga)(5)O-12:Ho3+,Yb3+ crystals are promising materials for the design of laser-diode pumped infrared lasers operating near 2000 nm. (C) 2015 Elsevier B.V. All rights reserved.
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Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Original article
Original article presents the results of original research or experiment.
Inne
System-identifier
PBN-R:719873
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