Abstract
Energy transfer analyses are performed on and codoped in borosilicate glasses to assess their potential as gain media for green lasers and amplifiers under the band pumping. Based on experimental observations using the samples highly codoped with and , a rate equation model of energy transfers between and is constructed considering the four types of energy transfers processes; (i) the cooperative energy transfer upconversion, (ii) the phonon-assisted energy transfer from to , (iii) the cooperative cross relaxation, and (iv) the phonon-assisted energy transfer from to . The rate equation model can simulate the experimental emission dynamics of and codoped samples well. It is clarified that a practical signal gain at can be obtained in codoped fiber under the band pumping.
© 2009 Optical Society of America
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