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Cascade-Avalanche Up-Conversion in Tm3+:YLF Crystals

Identifieur interne : 001F55 ( Main/Exploration ); précédent : 001F54; suivant : 001F56

Cascade-Avalanche Up-Conversion in Tm3+:YLF Crystals

Auteurs : E. Yu. Perlin [Russie] ; A. M. Tkachuk [Russie] ; M.-F. Joubert [France] ; R. Moncorge [France]

Source :

RBID : Pascal:01-0219151

Descripteurs français

English descriptors

Abstract

New efficient mechanisms of long-wavelength excitation of short-wavelength luminescence in a system of rare-earth impurity ions are proposed. The model studied involves a multilevel system of electronic states of a rare-earth ion interacting with the long-wavelength emission that is in resonance with one or several transitions between the excited levels. The concentration of impurity ions is assumed to be sufficiently high, so that the interionic cross-relaxation and the up-conversion play a significant role. Moreover, the model includes processes similar to photon avalanche, in which the photoinduced excitation of a single ion is converted into lower-level excitations of several ions, each of them reentering the process after photon absorption. Numerical solutions of the system of balance equations for a multilevel system are obtained with calculated and semiempirical parameters of self-quenching and up-conversion. It is shown that, in a system of Tm3+ impurity ions, short-wavelength luminescence at λ ≥ 0.29 μm can be efficiently excited by radiation at λ ≅ 1.11 or 0.649 μm with a moderate intensity. © 2001 MAIK Nauka / Interperiodica .


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Le document en format XML

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<sup>3+</sup>
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