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1 August 1991 Upconversion intensity and multiphonon relaxation of Er3+-doped glasses
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Proceedings Volume 1513, Glasses for Optoelectronics II; (1991)
Event: ECO4 (The Hague '91), 1991, The Hague, Netherlands
The upconversion fluorescence properties of Er3+ ions were studied for several glasses in the systems of fluoride, fluorophosphate, and oxide. As an excitation source, the infrared radiation of a GaAlAs laser diode ((lambda) equals 802 nm) was used. A green emission due to 4S3/2-4I15/2 transition could be observed not only for fluoride glasses but also for some oxide glasses composed of heavy metal ions with 30 mW excitation. It was found from the photon sideband spectra that the upconversion intensity was influenced by the energy of phonons coupled with the rare-earth ions and that the energy almost corresponded to the stretching vibration in each glass. The temperature dependence of upconversion intensity was large for the fluoride system, while it was small for the fluorophosphate system. These tendencies could be well explained by considering the temperature dependence of the multiphoton relaxation rate, which is a function of the phonon energy consumed during the nonradiative decay. The results were discussed combined with those of 151Eu-Mossbauer spectroscopy on the local structure and covalency of rare- earth ions in these glasses.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Setsuhisa Tanabe, Kazuyuki Hirao, Naohiro Soga, and Teiichi Hanada "Upconversion intensity and multiphonon relaxation of Er3+-doped glasses", Proc. SPIE 1513, Glasses for Optoelectronics II, (1 August 1991);

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