Abstract
Emission enhancement at 2.7 mm is observed in Er3+/Pr3+-codoped germanate glasses when pumped by a
980-nm laser diode. Significant reductions in 1.5-mm emission and upconversion intensity indicate efficient
energy transfer between Er3+ and Pr3+; the energy transfer efficiency is as high as 77.4%. The mechanisms of
energy transfer are discussed in detail. The calculated emission cross-section of Er3+/Pr3+-codoped germanate
glass is 8.44×10-21 cm2, which suggests that Er3+/Pr3+-codoped germanate glass can be used to achieve
efficient 2.7-mm emission.
© 2013 Chinese Optics Letters
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