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23 February 2011 Spectroscopic properties of Nd, Er codoped glasses for solar pumped fiber lasers
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Proceedings Volume 7934, Optical Components and Materials VIII; 79341D (2011)
Event: SPIE OPTO, 2011, San Francisco, California, United States
The absorption and fluorescence characteristics of Er doped and Nd, Er codoped fluoride glasses were investigated under illumination of the simulated sunlight, laser or a monochromatic light filtered from a Xe lamp. Er was used as a sensitizing agent enhancing the energy conversion and the emission efficiency of Nd ions in fluoride glass intended for the sunlight excitation. Er doped fluoride glasses showed four emission peaks under simulated sunlight illumination at the wavelengths of 550, 848, 980, and 1530 nm attributed to the electronic transitions of Er3+ ions. The quantum efficiency of the emission from all of the bands had a peak at x = 0.5 mol. % Er and with the maximum of 73 %. The intensity of each emission band showed different ratios for various ErF3 contents. It is expected that concentration quenching of 4S3/2 state is easy to occur with high concentration of ErF3 compared to the other states. The energy transfer from Er to Nd was studied using a monochromatic light illumination which is absorbed by Er3+ ions only. Strong contribution of Er absorption to the 1.05 μm emission of Nd, Er co-doped fluoride glass was observed. Er was confirmed as a suitable sensitizer for the enhanced energy conversion and emission efficiency of Nd ions in ZBLAN glasses which are proposed for highly efficient solar pumped fiber lasers.
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Shintaro Mizuno, Hiroshi Ito, Kazuo Hasegawa, Hiroyuki Kawai, Hiroyuki Nasu, Mark A. Hughes, Takenobu Suzuki, and Yasutake Ohishi "Spectroscopic properties of Nd, Er codoped glasses for solar pumped fiber lasers", Proc. SPIE 7934, Optical Components and Materials VIII, 79341D (23 February 2011);

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