| Steady-State and Switch-Off Behavior of Upconversion in Er-Doped Fibers |
| D. Khoptyar and B. Jaskorzynska Laboratory of Optics, Photonics and Quantum Electronics, Department of Microelectronics and Information Technology, Royal Institute of Technology, Electrum 229, 16440 Kista, Sweden |
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| By measuring the metastable and the upconverted fluorescence in Er-doped fibers we determine rate of homogeneous upconversion as a function of the population inversion. The results confirm the prediction of our statistical model that at the same population inversion the upconversion rates under the steady-state and the switch-off conditions are different. The larger rate of the steady state upconversion is attributed to the pump enhanced redistribution of the excitation energy. |
| DOI: 10.12693/APhysPolA.103.207 PACS numbers: 71.20.Eh, 78.20.Bh, 78.55.--m, 42.65.--k |