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Population of higher-energy levels in LiY_(1-x)Er_xF_4 (x=O.003 ÷1) crystals under CW IR laser-diode pumping

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Tkachuk, A. M. and Razumova, I. K. and Mirzaeva, A. A. and Novikov, G. E. and Orlov2, O. A. and Malyshev, Andrey and Gapontsev, V. P. (2002) Population of higher-energy levels in LiY_(1-x)Er_xF_4 (x=O.003 ÷1) crystals under CW IR laser-diode pumping. In XI Feofilov Symposium on Spectroscopy of Crystals Activated by Rare-Earth and Transition Metalions. Proceedings of SPIE (4766). Spie-Int Soc Optical Engineering. ISBN 0-8194-4533-9

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Official URL: http://dx.doi.org/10.1117/12.475342




Abstract

Steady-state population of 7 lowest excited erbium. levels in LiY¬¬_(1-x)Er_xF_4 (YLF:Er^(3+) (x=0.003-1) crystals was studied under upconversion. CW InGaAs laser-diode pumping with varied power density. Theoretical and experimental concentration and power dependencies of population of higher-energy radiative levels were obtained. Relative changes in populations of studied levels in YLF:Er^(3+) crystals were experimentally controlled by visible spectra of steady-state luminescence in the wavelength ranges corresponding to transitions ^4S_(3/2) --> ^4I(15/2) (0.52--0.57) mum and ^4 F_(9/2) --> ^I_(15/2) (0.64--0.68) µm. IR-pumped luminescence kinetic curves of higher-energy transitions ^4S_(3/2) --> ^4I_(15/2) (0.55 µm) and ^2H_(9/2) --> ^4I_(15/2) (0.41 µm) were recorded. The energy-transfer mechanisms were determined, and the predominant mechanisms responsible for upconversion excitation were elucidated. Microparameters of energy transfer and concentration dependencies of the selfquenching rates and non-linear coupling were obtained on the basis of theoretical and experimental estimates of the rates of intra- and intercenter relaxation processes (migration, selfquenching, and upconversion) allowing for statistics of coupling between the impurity centers in the system. The steady-state dependencies of population on the erbium concentration and pumping power density were calculated within the framework of rate balance equations. Good agreement between the theory and experimental data was obtained.


Item Type:Book Section
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©Spie-Int Soc Optical Engineering.
ISSN: 0277-786X
Feofilov Workshop on Spectroscopy of Crystals Activated by Rare-Earth and Transition-Metal Ions (11. 2001. Kazan, Rusia).
The work was partly supported by INTAS, Grant No. INTAS-97-787, and Russian Foundation for Basic Researches, Grants No. 00-02-16637.

Uncontrolled Keywords:Solid-state lasers; Energy transfer; Upconversion; Laser-diode pumping
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:45738
Deposited On:15 Dec 2017 18:01
Last Modified:05 Jul 2018 14:51

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