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In order to obtain a high laser efficiency from Xe pumped Nd laser systems, a novel cavity filter glass doped with Eu3+ and Sm3+ was investigated using a phosphate host. Sm3+, which served to inhibit ASE also was found to strongly transfer its energy to the Eu3+. The Eu3+ emits an efficient red emission from the 5D0 yields 7F1 transition which is located exactly at the Nd3+ absorption band and therein radiatively sensitizes the Nd laser emission. The energy transfer and back transfer of these two rare-earth ions in phosphate will be discussed. This doubly-doped phosphate glass cavity samples produced an increase in output power by 50 percent over undoped filters in a Xe pumped pulsed Nd:glass laser system.
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Honggu Jiang, John M. Ballato, John D. Myers, Daniel L. Rhonehouse, Yasi Jiang, Michael J. Myers, Shawn Kimble, "Energy transfer and sensitization of Nd3+ using Eu3+ and Sm3+ for Nd laser application," Proc. SPIE 4282, Rare-Earth-Doped Materials and Devices V, (27 April 2001); https://doi.org/10.1117/12.424784