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Soviet Journal of Quantum Electronics

Influence of the absorption of the excitation energy from the4I13/2level of erbium ions on the operation of Lu3Al5O12:Er crystal lasers

M A Andriasyan, N V Vardanyan, R. B. Kostanyan

Published Jun 30, 1982• 2 citations
Publisher

Abstract

An experimental investigation was made of Lu3Al5O12:Er crystal lasers utilizing a self-saturating transition 4I11/2–4I13/2. The absorption of the excitation energy from the 4I13/2 level of erbium ions had a considerable influence on the energy characteristics of these lasers.
DOI
10.1070/qe1982v012n06abeh005231

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A study was made of various cases of a population inversion between the 4I11/2 and 4I13/2 levels in Y3Al5O12:Er3+ crystals. It is found that when nonradiative transitions from the upper levels to the active levels by the mechanism of multiphonon energy transfer are more probable, laser action occurs due to transitions between the Stark components of the 4I11/2 and 4I13/2 levels with the highest oscillator strengths. If nonradiative transitions due to ion-ion interaction are more probable, a red shift is observed in the lasing spectra.
An investigation was made of the kinetics of the luminescence due to 4 I 11/2 → 4 I 15/2 and 4 I 13/2 → 4 I 15/2 transitions in the Er 3+ ion in yttrium erbium aluminum garnet crystals subjected to strong resonant excitation argon laser radiation (λ = 4880 nm). The efficiency of the cooperative process resulting in nonlinear quenching of the luminescence from the 4 I 13/2 level and sensitization of the 4 I 11/2 level was estimated. The influence of this process on the kinetics of lasing as a result of the 4 I 11/2 → 4 I 13/2 transition (λ = 2.94 μ) was analyzed.