Quantum Electronics and Laser Science Conference

Nonlinear cooperative energy transfer in La/sub 1-x/Ce/sub x/F/sub 3/ crystals

Tasoltan T. Basiev, Maxim E. Doroshenko, В. В. Осико

Published May 12, 2000• 0 citations

Abstract

Summary form only given. We report on a new nonlinear optical phenomenon in LaCeF/sub 3/:Nd crystals of cooperative energy transfer-cooperative cross-relaxation, that is the energy transfer from single donor ion simultaneously to the pair (or more) ions, acting as nonlinear cooperative acceptor. The dependence of fluorescence intensity and decay rate at the kinetic stage of the process here can not be described by linear dependence on acceptor's concentration and becomes essentially nonlinear.

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Quantum Electronics and Laser Science Conference

Nonlinear cooperative energy transfer in La/sub 1-x/Ce/sub x/F/sub 3/ crystals

Tasoltan T. Basiev, Maxim E. Doroshenko, В. В. Осико

Published May 12, 2000• 0 citations

OpenAlex

Abstract

Related papers

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Advanced Solid-State LasersJan 1, 20001 citation

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Robert D. Jenkins, Davıd L. Andrews

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We have investigated the process of quenching of fluorescence from the $^{3}P_{0}$ state of ${\mathrm{Pr}}^{3+}$ in ${\mathrm{La}}_{0.72}$ ${\mathrm{Pr}}_{0.25}$ ${\mathrm{Nd}}_{0.03}$ ${\mathrm{F}}_{3}$ due to cross relaxation to Pr and Nd ions. The fluorescence decay of the ensemble of Pr ions after pulsed excitation is measured as a function of temperature in the (2-70)-K region. Cross relaxation occurs either directly or through a donor-donor transfer within the inhom-geneous line. Knowledge of the dynamics occurring within the inhomogeneous line derived from previous fluorescence line-narrowing experiments is used to analyze the cross-relaxation process from a microscopic viewpoint according to models for fluorescence decay in the presence of traps. In general the decay is consistent with an electric dipole-dipole transfer mechanism. At 2 K the decay can be well described by a direct transfer to Pr and Nd traps without donor-donor transfer. The temperature dependence of the decay at long times can be described for $35<T<70$ K by the hopping model. The agreement with theory is much better if the cross relaxation to Nd ions is assumed to occur mainly via the lowest Stark level of the $^{4}I_{\frac{9}{2}}$ manifold.We have investigated the process of quenching of fluorescence from the $^{3}P_{0}$ state of ${\mathrm{Pr}}^{3+}$ in ${\mathrm{La}}_{0.72}$${\mathrm{Pr}}_{0.25}$${\mathrm{Nd}}_{0.03}$${\mathrm{F}}_{3}$ due to cross relaxation to Pr and Nd ions. The fluorescence decay of the ensemble of Pr ions after pulsed excitation is measured as a function of temperature in the (2-70)-K region. Cross relaxation occurs either directly or through a donor-donor transfer within the inhom-geneous line. Knowledge of the dynamics occurring within the inhomogeneous line derived from previous fluorescence line-narrowing experiments is used to analyze the cross-relaxation process from a microscopic viewpoint according to models for fluorescence decay in the presence of traps. In general the decay is consistent with an electric dipole-dipole transfer mechanism. At 2 K the decay can be well described by a direct transfer to Pr and Nd traps without donor-donor transfer. The temperature dependence of the decay at long times can be described for $35<T<70$ K by the hopping model. The agreement with theory is much better if the cross relaxation to Nd ions is assumed to occur mainly via the lowest Stark level of the $^{4}I_{\frac{9}{2}}$ manifold.

Physical review. B, Condensed matterMay 1, 19849 citations

We report the discovery of population in the

^{1}S_{0}

state (46 986 ${\mathrm{cm}}^{\ensuremath{-}1}$) of

{\mathrm{Pr}}^{3+}

following the excitation of the

^{3}P_{0}

state (20 925 ${\mathrm{cm}}^{\ensuremath{-}1}$) by a 477.8-nm pulse laser. The energy upconversion is attributed to a cooperative energy transfer from a pair of

{\mathrm{Pr}}^{3+}

ions in the

^{3}P_{0}

state to a nearby ion in the same state. A Pr

{\mathrm{F}}_{3}

crystal and three La

{\mathrm{F}}_{3}

{\mathrm{Pr}}^{3+}

crystals doped with 10, 20, and 60 at.%

{\mathrm{Pr}}^{3+}

are tested in our experiment. The lifetime of the

^{1}S_{0}

state and the decay of the

^{3}P_{0}

state of each of the crystals are investigated. The results are used to solve the rate equations for calculating the temporal variations of the populations in the

^{1}S_{0}

state in different crystals. The calculated result agrees with the measured variation of the uv emission ($^{1}S_{0}\ensuremath{\rightarrow}^{3}P_{1}+^{1}I_{6}$, 393 nm).

We have investigated the process of quenching of fluorescence from the

^{3}P_{0}

state of

{\mathrm{Pr}}^{3+}

{\mathrm{La}}_{0.72}

{\mathrm{Pr}}_{0.25}

{\mathrm{Nd}}_{0.03}

{\mathrm{F}}_{3}

due to cross relaxation to Pr and Nd ions. The fluorescence decay of the ensemble of Pr ions after pulsed excitation is measured as a function of temperature in the (2-70)-K region. Cross relaxation occurs either directly or through a donor-donor transfer within the inhom-geneous line. Knowledge of the dynamics occurring within the inhomogeneous line derived from previous fluorescence line-narrowing experiments is used to analyze the cross-relaxation process from a microscopic viewpoint according to models for fluorescence decay in the presence of traps. In general the decay is consistent with an electric dipole-dipole transfer mechanism. At 2 K the decay can be well described by a direct transfer to Pr and Nd traps without donor-donor transfer. The temperature dependence of the decay at long times can be described for

35<T<70

K by the hopping model. The agreement with theory is much better if the cross relaxation to Nd ions is assumed to occur mainly via the lowest Stark level of the

^{4}I_{\frac{9}{2}}

manifold.