期刊
APPLIED PHYSICS B-LASERS AND OPTICS
卷 106, 期 1, 页码 101-105出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00340-011-4624-y
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资金
- Department of Science and Technology, New Delhi, India
- University Grant Commission, New Delhi, India
- Council for Scientific and Industrial Research, New Delhi, India
In this paper we report the two photon upconversion process in nanosize Pr:Y2O3 crystals on excitation with 532 nm photon at room temperature. Upconversion emission intensity shows an abrupt change at the critical pump threshold. On the basis of the temporal evolution of the intermediate state population and power-dependence studies, it is concluded that the significant variation in upconversion emission intensity is due to the photon avalanche process.
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