Abstract
We observed intense green upconversion emission from centered at due to transition in codoped alumino-germano-silicate optical fibers by direct excitation of ions with a laser diode at . A two-photon cooperative energy transfer upconversion among a pair of donor ions and a acceptor ion are responsible for the observed green emission. Appropriately increasing the concentration of relative to was found to facilitate the energy transfer upconversion process from to , while an excess of ions inversely introduced more of the concentration quenching effect and phonon-assistant backward energy transfer from to and, therefore, damaged the observed green emission. The intensity of the observed green emission was found optimum for a concentration ratio of to of in alumino-germano-silicate optical glass fibers.
© 2010 Optical Society of America
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