MgO-codoping effects on the spectroscopic properties of Er3+-doped LiNbO3
Autor: | Tian-Quan Lü, Ai-Hua Li, Liang Sun, Wenzhi Wu, Zhi-Ren Zheng, Qiang Lü, Yanqiang Yang, Weilong Liu |
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Rok vydání: | 2008 |
Předmět: | |
Zdroj: | Journal of Applied Physics. 104:033511 |
ISSN: | 1089-7550 0021-8979 |
Popis: | Optical absorption, spectrally resolved polarized upconversion fluorescence, and time-resolved luminescence spectra are used to investigate the Er3+ spectroscopic properties in a series of congruent LiNbO3 crystals codoped with Er3+ (1 mol %) and MgO (X mol %, X=0, 2, 4, 6, and 8). The absorption spectra indicate that the transition cross section of Er3+ ions decreases with increasing MgO concentration; it is explained as the improvement of the Er3+-site symmetries. A new Er3+ energy site with low energy, which appears in the long wavelength side of the polarized fluorescence spectra for the samples heavily codoped with MgO, is demonstrated in the time-resolved luminescence spectra. An important finding is that mild codoping with MgO clearly does not facilitate the formation of clustered sites, whereas heavy codoping clearly does facilitate it in Er3+-doped LiNbO3 crystals. These results are important to those who consider the material as a 1.5 μm laser or fiber optical cable. |
Databáze: | OpenAIRE |
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