N. N. Il'ichev, G. A. Bufetova, È. S. Gulyamova, P. P. Pashinin, A. V. Sidorin, V. V. Tumorin, V. P. Kalinushkin, E. M. Gavrishchuk, D. V. Savin, S. A. Rodin, V. B. Ikonnikov, “Free-electron Auger quenching of the Fe<sup>2+</sup> excited state in ZnSe”, Kvantovaya Elektronika, 2019, Volume 49, Number 12,Pages <nobr>1175

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Free-electron Auger quenching of the Fe²⁺ excited state in ZnSe

N. N. Il'ichev^a, G. A. Bufetova^a, È. S. Gulyamova^a, P. P. Pashinin^a, A. V. Sidorin^a, V. V. Tumorin^a, V. P. Kalinushkin^a, E. M. Gavrishchuk^b, D. V. Savin^b, S. A. Rodin^b, V. B. Ikonnikov^b

^a Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow
^b Institute of Chemistry of High-Purity Substances RAS, Nizhnii Novgorod

Abstract: The influence of free electrons in Fe²⁺ : ZnSe crystals on the nonlinear transmission of high-power laser radiation with a wavelength of 2940 nm at room and low temperatures is experimentally found. Fe²⁺ : ZnSe samples additionally doped with Al are used. The transmission of an Al : Fe : ZnSe sample with electron conduction in a strong (peak intensity about 4.6 MW cm^-2) field is almost the same as in a weak field both at low and room temperatures. The absence of an increase in the transmission of this sample under the action of high-power radiation is explained by increasing absorption saturation intensity of Fe²⁺ at this wavelength due a decrease in the lifetime of the excited state of Fe²⁺. The decrease in the lifetime is related to the well-known Auger quenching of impurity luminescence in semiconductors by free electrons.

Keywords: auger effect, free electrons, Fe²⁺ : ZnSe, nonlinear transmission.

Received: 25.09.2019