Abstract
Excitation of the transition of the ion in , -doped fluorozirconate glass at 974 nm results in efficient excitation of the level of ion that in turn emits in the middle infrared at . The energy transfer (ET) process is assisted by fast excitation migration among the ions. An upconversion process involving ET from the level to the excited state populates the excited state that produces emission at 481, 521, 603, 636, and 717 nm. A study of the behavior of the fluorescence from the level at 1325 nm and from the level at 603 nm allowed the estimation of the ET rate constants for the processes involved after short-pulsed laser excitation at 974 nm. A rate-equation model was employed to evaluate the population inversion relating to the transition of the ion at 3.6 μm under continuous wave pumping.
© 2013 Optical Society of America
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