Abstract
We report on cooperative downconversion in ( or Pr) codoped lanthanum borogermanate glasses (LBG), which are capable of splitting a visible photon absorbed by or ions into two near-infrared photons. The results indicate that is a more efficient ion couple than in terms of cooperative downconversion. We have obtained a highest quantum yield of 165% and 138% for and codoped LBG glasses under excitation, respectively. However, ultraviolet light excitation to the charge transfer band of does not result in quantum splitting as rapid relaxation from the charge transfer band to levels of dominates.
© 2008 Optical Society of America
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