期刊
JOURNAL OF LUMINESCENCE
卷 114, 期 1, 页码 43-52出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2004.11.009
关键词
upconversion; energy transfer; rare earth; Er : YAG
类别
The efficiency of erbium three-micron laser (laser transition I-4(11/2) -> I-4(13/2)) depends essentially on the ratio of the parameters of active energy transfer upconversion (ETU) from the laser levels. The parameters of both ETU processes can be obtained from the analysis of the shape of the kinetics of the 4I(11/2) level in concentrated Er:YAG crystals, under short pulse pumping. Mathematical modeling is used to evaluate the sensitivity of the method and to estimate the errors which can be introduced by the inhomogeneous pumping and accidental impurities. It was found that the ratio of the parameters corresponding to the ETU from the laser levels is less sensitive to the pumping inhomogeneities than that corresponding to the lower laser level. A reduction of this ratio with increasing erbium concentration is observed. (c) 2004 Elsevier B.V. All rights reserved.
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