Energy-transfer processes in Er3+-doped and Er3+,Pr3+-codoped ZBLAN glasses

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Golding, P.S. and Jackson, S.D. and King, T.A. and Pollnau, M. (2000) Energy-transfer processes in Er3+-doped and Er3+,Pr3+-codoped ZBLAN glasses. Physical Review B: Condensed matter and materials physics, 62 (2). pp. 856-864. ISSN 1098-0121

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Abstract:We present a detailed characterization of energy transfer processes in Er3+-doped and Er3+,Pr3+-codoped ZBLAN bulk glasses. For several Er3+ (0.25–8.75 mol%) and Pr3+ (0.25–1.55 mol%) concentrations, we investigate energy transfer upconversion (ETU) and cross relaxation in Er3+ as well as energy transfer (ET) from Er3+ to the Pr3+ codopant. The measured parameters of ETU from the Er3+ 4I13/2 and 4I11/2 levels are comparable to those of LiYF4:Er3+. ETU from 4I13/2, in particular, possesses a factor of 3 larger probability than ETU from 4I11/2. The parameters of ET from the Er3+ 4I13/2 and 4I11/2 levels to the Pr3+ codopant are larger than the corresponding ETU parameters. ET effectively quenches the 4I13/2 intrinsic lifetime of 9 ms down to 20 us for the highest Er3+ and Pr3+ concentrations investigated, and is more efficient than ET from 4I11/2, because the corresponding absorption transition in Pr3+ has a large oscillator strength and back transfer is inhibited by fast multiphonon relaxation from the corresponding Pr3+ level. In both cases, the ET parameters depend on Er3+ concentration in a similar way as the ETU parameters but depend only weakly on Pr3+ concentration. This shows that energy migration within the Er3+ 4I13/2 and 4I11/2 levels is fast. The presented results are important for the choice of the appropriate operational regime of the erbium 3-um fiber laser.
Item Type:Article
Copyright:© 2000 American Physical Society
Faculty:
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/70094
Official URL:http://dx.doi.org/10.1103/PhysRevB.62.856
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