期刊
OPTICS EXPRESS
卷 18, 期 3, 页码 2934-2939出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.18.002934
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资金
- National High Technology Research and Development Program of China [2009AA03Z309]
- National Natural Science Foundation of China (NNSFC) [10874058, 50672030]
Multiphoton upconversion (UC) emissions from the high-energy states ((4)G(9/2), (4)G(7/2), K-2(13/2), and P-2(3/2)) of Er3+ ions were observed under 980 nm excitation. These high-energy excited states were populated by a five-photon or a four-photon UC process conditionally, which depended on the near-infrared (NIR) pump density. Experiments exhibited that the power dependence originated from the varied populating routes of intermediated S-4(3/2) and F-4(9/2) of Er3+ under different NIR pump power. A mechanism of the power density-dependent multiphoton UC processes was proposed based on experimental data and analysis. (C) 2010 Optical Society of America
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