Laser spectroscopy of Nd3+ ions in GeO2-PbO-Bi2O3 glasses
The optical properties of Nd3+ ions in six different compositions of glasses based on GeO2, PbO, and Bi2O3 have been investigated by using steady-state and time-resolved laser spectroscopy. Judd-Ofelt parameters were derived from the absorption spectra and used to calculate the 4F3/2→4H11/2 stimulat...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2000 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/100746 |
| Acceso en línea: | http://hdl.handle.net/10261/100746 |
| Access Level: | acceso abierto |
| Palabra clave: | Lead-germanate glasses Metal oxide glasses Rare-earth ions Up-conversion Energy-transfer Optical-properties Fluorescence Absorption Dependence Emission |
| Sumario: | The optical properties of Nd3+ ions in six different compositions of glasses based on GeO2, PbO, and Bi2O3 have been investigated by using steady-state and time-resolved laser spectroscopy. Judd-Ofelt parameters were derived from the absorption spectra and used to calculate the 4F3/2→4H11/2 stimulated emission cross section and the 4F3/2 radiative lifetime. Site-selective spectroscopy and time resolved fluorescence line narrowing experiments were performed in the 4F3/2→4I9/2,4I 11/2 transitions. For all samples studied a line narrowing of the 4F3/2→4I11/2 emission has been observed when exciting at the long wave side of the 4I9/2→4F3/2 transition. The lifetimes of the 4F3/2 state do not show a monotonic variation with the excitation wavelength indicating large site-to-site variations in the local crystal field. Spectral migration of excitation among the Nd3+ ions has been studied from the time evolution of the 4F3/2→4I9/2 spectra under resonant excitation. The results can be interpreted in terms of a dipole-dipole energy transfer mechanism. Visible upconversion has been observed in these glasses under infrared laser excitation. ©2000 The American Physical Society. |
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