Abstract
The multicolor intense visible emission from and ions codoped in glass upon excitation at radiation from a nanosecond pulsed Nd:YAG laser has been investigated. The optical parameters of erbium ions codoped in glass by using the Judd–Ofelt theory have been determined from the optical absorption spectra. No upconversion (UC) emission was seen in the singly doped -doped glass upon excitation at 1064 nm. Through the experiments, it has been found that, in the codoped glass, the UC luminescence from (2.0 mol. %) in green and red regions corresponding to the , , and transitions is strengthened about , , and fold, respectively, at 2.0 mol. % ion concentration in codoped glass. The observed UC emissions and the enhancement observed in their intensity have been explained on the basis of efficient energy transfer and cross-relaxation energy transfer processes.
© 2014 Optical Society of America
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